Network Working Group D. Levi Request for Comments: 2263 SNMP Research, Inc. Category: Standards Track P. Meyer Secure Computing Corporation B. Stewart Cisco Systems January 1998
This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.
Copyright (C) The Internet Society (1997). All Rights Reserved.
This memo describes five types of SNMP applications which make use of an SNMP engine as described in [RFC2261]. The types of application described are Command Generators, Command Responders, Notification Originators, Notification Receivers, and Proxy Forwarders.
This memo also defines MIB modules for specifying targets of management operations, for notification filtering, and for proxy forwarding.
1 Overview
1.1 Command Generator Applications
1.2 Command Responder Applications
1.3 Notification Originator Applications
1.4 Notification Receiver Applications
1.5 Proxy Forwarder Applications
2 Management Targets
3 Elements Of Procedure
3.1 Command Generator Applications
3.2 Command Responder Applications
3.3 Notification Originator Applications
3.4 Notification Receiver Applications
3.5 Proxy Forwarder Applications
3.5.1 Request Forwarding
3.5.1.1 Processing an Incoming Request
3.5.1.2 Processing an Incoming Response
3.5.1.3 Processing an Incoming Report Indication
3.5.2 Notification Forwarding
4 The Structure of the MIB Modules
4.1 The Management Target MIB Module
4.1.1 Tag Lists
4.1.2 Definitions
4.2 The Notification MIB Module
4.2.1 Definitions
4.3 The Proxy MIB Module
4.3.1 Definitions
5 Identification of Management Targets in Notification
Originators
6 Notification Filtering
7 Management Target Translation in Proxy Forwarder
Applications
7.1 Management Target Translation for Request Forwarding
7.2 Management Target Translation for Notification Forwarding
8 Intellectual Property
9 Acknowledgments
10 Security Considerations
11 References
12 Editors' Address
A. Trap Configuration Example
B. Full Copyright Statement
This document describes five types of SNMP applications:
- Applications which initiate SNMP Get, GetNext, GetBulk, and/or Set requests, called 'command generators.' - Applications which respond to SNMP Get, GetNext, GetBulk, and/or Set requests, called 'command responders.' - Applications which generate notifications, called 'notification originators.' - Applications which receive notifications, called 'notification receivers.' - Applications which forward SNMP Get, GetNext, GetBulk, and/or Set requests or notifications, called 'proxy forwarder.'
Note that there are no restrictions on which types of applications may be associated with a particular SNMP engine. For example, a single SNMP engine may, in fact, be associated with both command generator and command responder applications.
A command generator application initiates SNMP Get, GetNext, GetBulk, and/or Set requests, as well as processing the response to a request which it generated.
A command responder application receives SNMP Get, GetNext, GetBulk, and/or Set requests destined for the local system as indicated by the fact that the contextEngineID in the received request is equal to that of the local engine through which the request was received. The command responder application will perform the appropriate protocol operation, using access control, and will generate a response message to be sent to the request's originator.
A notification originator application conceptually monitors a system for particular events or conditions, and generates Trap and/or Inform messages based on these events or conditions. A notification originator must have a mechanism for determining where to send messages, and what SNMP version and security parameters to use when sending messages. A mechanism and MIB module for this purpose is provided in this document.
A notification receiver application listens for notification messages, and generates response messages when a message containing an Inform PDU is received.
A proxy forwarder application forwards SNMP messages. Note that implementation of a proxy forwarder application is optional. The sections describing proxy (4.5, 5.3, and 8) may be skipped for implementations that do not include a proxy forwarder application.
The term "proxy" has historically been used very loosely, with multiple different meanings. These different meanings include (among others):
Each of these scenarios can be advantageous; for example, support for aggregation of management information can significantly reduce the bandwidth requirements of large-scale management activities. However, using a single term to cover multiple different scenarios causes confusion.
To avoid such confusion, this document uses the term "proxy" with a much more tightly defined meaning. The term "proxy" is used in this document to refer to a proxy forwarder application which forwards either SNMP requests, notifications, and responses without regard for what managed objects are contained within requests or notifications. This definition is most closely related to the first definition above. Note, however, that in the SNMP architecture [RFC2261], a proxy forwarder is actually an application, and need not be associated with what is traditionally thought of as an SNMP agent.
Specifically, the distinction between a traditional SNMP agent and a proxy forwarder application is simple:
- a proxy forwarder application forwards requests and/or notifications to other SNMP engines according to the context, and irrespective of the specific managed object types being accessed, and forwards the response to such previously forwarded messages back to the SNMP engine from which the original message was received; - in contrast, the command responder application that is part of what is traditionally thought of as an SNMP agent, and which processes SNMP requests according to the (names of the) individual managed object types and instances being accessed, is NOT a proxy forwarder application from the perspective of this document.
Thus, when a proxy forwarder application forwards a request or notification for a particular contextEngineID / contextName pair, not only is the information on how to forward the request specifically associated with that context, but the proxy forwarder application has no need of a detailed definition of a MIB view (since the proxy forwarder application forwards the request irrespective of the managed object types).
In contrast, a command responder application must have the detailed definition of the MIB view, and even if it needs to issue requests to other entities, via SNMP or otherwise, that need is dependent on the individual managed object instances being accessed (i.e., not only on the context).
Note that it is a design goal of a proxy forwarder application to act as an intermediary between the endpoints of a transaction. In particular, when forwarding Inform requests, the associated response is forwarded when it is received from the target to which the Inform request was forwarded, rather than generating a response immediately when an Inform request is received.
Some types of applications (notification generators and proxy forwarders in particular) require a mechanism for determining where and how to send generated messages. This document provides a mechanism and MIB module for this purpose. The set of information that describes where and how to send a message is called a 'Management Target', and consists of two kinds of information:
- Destination information, consisting of a transport domain and a transport address. This is also termed a transport endpoint. - SNMP parameters, consisting of message processing model, security model, security level, and security name information.
The SNMP-TARGET-MIB module described later in this document contains one table for each of these types of information. There can be a many-to-many relationship in the MIB between these two types of information. That is, there may be multiple transport endpoints associated with a particular set of SNMP parameters, or a particular transport endpoint may be associated with several sets of SNMP parameters.
The following sections describe the procedures followed by each type of application when generating messages for transmission or when processing received messages. Applications communicate with the Dispatcher using the abstract service interfaces defined in [RFC2261].
A command generator initiates an SNMP request by calling the Dispatcher using the following abstract service interface:
statusInformation = -- sendPduHandle if success -- errorIndication if failure sendPdu( IN transportDomain -- transport domain to be used IN transportAddress -- destination network address IN messageProcessingModel -- typically, SNMP version IN securityModel -- Security Model to use IN securityName -- on behalf of this principal IN securityLevel -- Level of Security requested IN contextEngineID -- data from/at this entity IN contextName -- data from/in this context IN pduVersion -- the version of the PDU IN PDU -- SNMP Protocol Data Unit IN expectResponse -- TRUE or FALSE )
Where:
- The transportDomain is that of the destination of the message. - The transportAddress is that of the destination of the message. - The messageProcessingModel indicates which Message Processing Model the application wishes to use. - The securityModel is the security model that the application wishes to use. - The securityName is the security model independent name for the principal on whose behalf the application wishes the message is to be generated. - The securityLevel is the security level that the application wishes to use.
- The contextEngineID is provided by the command generator if it wishes to explicitly specify the location of the management information it is requesting. - The contextName is provided by the command generator if it wishes to explicitly specify the local context name for the management information it is requesting. - The pduVersion indicates the version of the PDU to be sent. - The PDU is a value constructed by the command generator containing the management operation that the command generator wishes to perform. - The expectResponse argument indicates that a response is expected.
The result of the sendPdu interface indicates whether the PDU was successfully sent. If it was successfully sent, the returned value will be a sendPduHandle. The command generator should store the sendPduHandle so that it can correlate a response to the original request.
The Dispatcher is responsible for delivering the response to a particular request to the correct command generator application. The abstract service interface used is:
processResponsePdu( -- process Response PDU IN messageProcessingModel -- typically, SNMP version IN securityModel -- Security Model in use IN securityName -- on behalf of this principal IN securityLevel -- Level of Security IN contextEngineID -- data from/at this SNMP entity IN contextName -- data from/in this context IN pduVersion -- the version of the PDU IN PDU -- SNMP Protocol Data Unit IN statusInformation -- success or errorIndication IN sendPduHandle -- handle from sendPDU )
Where:
- The messageProcessingModel is the value from the received response. - The securityModel is the value from the received response. - The securityName is the value from the received response.
- The securityLevel is the value from the received response. - The contextEngineID is the value from the received response. - The contextName is the value from the received response. - The pduVersion indicates the version of the PDU in the received response. - The PDU is the value from the received response. - The statusInformation indicates success or failure in receiving the response. - The sendPduHandle is the value returned by the sendPdu call which generated the original request to which this is a response.
The procedure when a command generator receives a message is as follows:
Before a command responder application can process messages, it must first associate itself with an SNMP engine. The abstract service interface used for this purpose is:
statusInformation = -- success or errorIndication registerContextEngineID( IN contextEngineID -- take responsibility for this one IN pduType -- the pduType(s) to be registered )
Where:
- The statusInformation indicates success or failure of the registration attempt. - The contextEngineID is equal to the snmpEngineID of the SNMP engine with which the command responder is registering. - The pduType indicates a Get, GetNext, GetBulk, or Set pdu.
Note that if another command responder application is already registered with an SNMP engine, any further attempts to register with the same contextEngineID and pduType will be denied. This implies that separate command responder applications could register separately for the various pdu types. However, in practice this is undesirable, and only a single command responder application should be registered with an SNMP engine at any given time.
A command responder application can disassociate with an SNMP engine using the following abstract service interface:
unregisterContextEngineID(
IN contextEngineID -- give up responsibility for this one IN pduType -- the pduType(s) to be unregistered )
Where:
- The contextEngineID is equal to the snmpEngineID of the SNMP engine with which the command responder is cancelling the registration. - The pduType indicates a Get, GetNext, GetBulk, or Set pdu.
Once the command responder has registered with the SNMP engine, it waits to receive SNMP messages. The abstract service interface used for receiving messages is:
processPdu( -- process Request/Notification PDU IN messageProcessingModel -- typically, SNMP version IN securityModel -- Security Model in use IN securityName -- on behalf of this principal
IN securityLevel -- Level of Security IN contextEngineID -- data from/at this SNMP entity IN contextName -- data from/in this context IN pduVersion -- the version of the PDU IN PDU -- SNMP Protocol Data Unit IN maxSizeResponseScopedPDU -- maximum size of the Response PDU IN stateReference -- reference to state information ) -- needed when sending a response
Where:
- The messageProcessingModel indicates which Message Processing Model received and processed the message. - The securityModel is the value from the received message. - The securityName is the value from the received message. - The securityLevel is the value from the received message. - The contextEngineID is the value from the received message. - The contextName is the value from the received message. - The pduVersion indicates the version of the PDU in the received message. - The PDU is the value from the received message. - The maxSizeResponseScopedPDU is the maximum allowable size of a ScopedPDU containing a Response PDU (based on the maximum message size that the originator of the message can accept). - The stateReference is a value which references cached information about each received request message. This value must be returned to the Dispatcher in order to generate a response.
The procedure when a message is received is as follows.
statusInformation = -- success or errorIndication isAccessAllowed( IN securityModel -- Security Model in use IN securityName -- principal who wants to access IN securityLevel -- Level of Security IN viewType -- read, write, or notify view IN contextName -- context containing variableName IN variableName -- OID for the managed object )
Where:
- The securityModel is the value from the received message. - The securityName is the value from the received message. - The securityLevel is the value from the received message. - The viewType indicates whether the PDU type is a read or write operation. - The contextName is the value from the received message. - The variableName is the object instance of the variable for which access rights are to be checked.
Normally, the result of the management operation will be a new PDU value, and processing will continue in step (6) below. However, at any time during the processing of the management operation:
- If the isAccessAllowed ASI returns a noSuchView, noAccessEntry, or noGroupName error, processing of the management operation is halted, a PDU value is contructed using the values from the originally received PDU, but
replacing the error_status with an authorizationError code, and error_index value of 0, and control is passed to step (6) below.
- If the isAccessAllowed ASI returns an otherError, processing of the management operation is halted, a different PDU value is contructed using the values from the originally received PDU, but replacing the error_status with a genError code, and control is passed to step (6) below. - If the isAccessAllowed ASI returns a noSuchContext error, processing of the management operation is halted, no result PDU is generated, the snmpUnknownContexts counter is incremented, and control is passed to step (6) below. - If the context named by the contextName parameter is unavailable, processing of the management operation is halted, no result PDU is generated, the snmpUnavailableContexts counter is incremented, and control is passed to step (6) below.
returnResponsePdu(
IN messageProcessingModel -- typically, SNMP version IN securityModel -- Security Model in use IN securityName -- on behalf of this principal IN securityLevel -- same as on incoming request IN contextEngineID -- data from/at this SNMP entity IN contextName -- data from/in this context IN pduVersion -- the version of the PDU IN PDU -- SNMP Protocol Data Unit IN maxSizeResponseScopedPDU -- maximum size of the Response PDU IN stateReference -- reference to state information -- as presented with the request IN statusInformation -- success or errorIndication ) -- error counter OID/value if error
Where:
- The messageProcessingModel is the value from the processPdu call. - The securityModel is the value from the processPdu call. - The securityName is the value from the processPdu call.
- The securityLevel is the value from the processPdu call. - The contextEngineID is the value from the processPdu call. - The contextName is the value from the processPdu call. - The pduVersion indicates the version of the PDU to be returned. If no result PDU was generated, the pduVersion is an undefined value. - The PDU is the result generated in step (5) above. If no result PDU was generated, the PDU is an undefined value. - The maxSizeResponseScopedPDU is a local value indicating the maximum size of a ScopedPDU that the application can accept. - The stateReference is the value from the processPdu call. - The statusInformation either contains an indication that no error occurred and that a response should be generated, or contains an indication that an error occurred along with the OID and counter value of the appropriate error counter object.
Note that a command responder application should always call the returnResponsePdu abstract service interface, even in the event of an error such as a resource allocation error. In the event of such an error, the PDU value passed to returnResponsePdu should contain appropriate values for errorStatus and errorIndex.
A notification originator application generates SNMP notification
messages. A notification message may, for example, contain an
SNMPv2-Trap PDU or an Inform PDU. However, a particular
implementation is not required to be capable of generating both types
of messages.
Notification originator applications require a mechanism for identifying the management targets to which notifications should be sent. The particular mechanism used is implementation dependent. However, if an implementation makes the configuration of management targets SNMP manageable, it MUST use the SNMP-TARGET-MIB module described in this document.
When a notification originator wishes to generate a notification, it
must first determine in which context the information to be conveyed
in the notification exists, i.e., it must determine the
contextEngineID and contextName. It must then determine the set of
management targets to which the notification should be sent. The application must also determine, for each management target, whether the notification message should contain an SNMPv2-Trap PDU or Inform PDU, and if it is to contain an Inform PDU, the number of retries and retransmission algorithm.
The mechanism by which a notification originator determines this information is implementation dependent. Once the application has determined this information, the following procedure is performed for each management target:
statusInformation = -- sendPduHandle if success -- errorIndication if failure sendPdu( IN transportDomain -- transport domain to be used IN transportAddress -- destination network address IN messageProcessingModel -- typically, SNMP version IN securityModel -- Security Model to use IN securityName -- on behalf of this principal IN securityLevel -- Level of Security requested IN contextEngineID -- data from/at this entity IN contextName -- data from/in this context IN pduVersion -- the version of the PDU
IN PDU -- SNMP Protocol Data Unit IN expectResponse -- TRUE or FALSE )
Where:
- The transportDomain is that of the management target. - The transportAddress is that of the management target. - The messageProcessingModel is that of the management target. - The securityModel is that of the management target. - The securityName is that of the management target. - The securityLevel is that of the management target. - The contextEngineID is the value originally determined for the notification. - The contextName is the value originally determined for the notification. - The pduVersion is the version of the PDU to be sent. - The PDU is the value constructed in step (3) above. - The expectResponse argument indicates that no response is expected.
Otherwise,
a) The Dispatcher is called using the sendPdu abstract service interface as described in step (4) above, except that the expectResponse argument indicates that a response is expected.
b) The application caches information about the management target.
c) If a response is received within an appropriate time interval from the transport endpoint of the management target, the notification is considered acknowledged and the cached information is deleted. Otherwise,
d) If a response is not received within an appropriate time period, or if a report indication is received, information about the management target is retrieved from the cache, and steps a) through d) are repeated. The number of times these steps are repeated is equal to the previously determined retry count. If this retry count is exceeded, the acknowledgement of the notification is considered to have failed, and processing of the notification for this management target is halted.
Responses to Inform PDU notifications will be received via the processResponsePDU abstract service interface.
Notification receiver applications receive SNMP Notification messages from the Dispatcher. Before any messages can be received, the notification receiver must register with the Dispatcher using the registerContextEngineID abstract service interface. The parameters used are:
- The contextEngineID is an undefined 'wildcard' value. Notifications are delivered to a registered notification receiver regardless of the contextEngineID contained in the notification message. - The pduType indicates the type of notifications that the application wishes to receive (for example, SNMPv2-Trap PDUs or Inform PDUs).
Once the notification receiver has registered with the Dispatcher, messages are received using the processPdu abstract service interface. Parameters are:
- The messageProcessingModel indicates which Message Processing Model received and processed the message. - The securityModel is the value from the received message. - The securityName is the value from the received message. - The securityLevel is the value from the received message. - The contextEngineID is the value from the received message. - The contextName is the value from the received message.
- The pduVersion indicates the version of the PDU in the received message. - The PDU is the value from the received message. - The maxSizeResponseScopedPDU is the maximum allowable size of a ScopedPDU containing a Response PDU (based on the maximum message size that the originator of the message can accept). - If the message contains an SNMPv2-Trap PDU, the stateReference is undefined and unused. Otherwise, the stateReference is a value which references cached information about the notification. This value must be returned to the Dispatcher in order to generate a response.
When an SNMPv2-Trap PDU is delivered to a notification receiver application, it first extracts the SNMP operation type, request-id, error-status, error-index, and variable-bindings from the PDU. After this, processing depends on the particular implementation.
When an Inform PDU is received, the notification receiver application follows the following procedure:
- The messageProcessingModel is the value from the processPdu call. - The securityModel is the value from the processPdu call. - The securityName is the value from the processPdu call. - The securityLevel is the value from the processPdu call. - The contextEngineID is the value from the processPdu call. - The contextName is the value from the processPdu call. - The pduVersion indicates the version of the PDU to be returned.
- The PDU is the result generated in step (2) above. - The maxSizeResponseScopedPDU is a local value indicating the maximum size of a ScopedPDU that the application can accept. - The stateReference is the value from the processPdu call. - The statusInformation indicates that no error occurred and that a response should be generated.
A proxy forwarder application deals with forwarding SNMP messages. There are four basic types of messages which a proxy forwarder application may need to forward. These are grouped according to the PDU type contained in a message, or according to whether a report indication is contained in the message. The four basic types of messages are:
- Those containing PDU types which were generated by a command generator application (for example, Get, GetNext, GetBulk, and Set PDU types). These deal with requesting or modifying information located within a particular context. - Those containing PDU types which were generated by a notification originator application (for example, SNMPv2-Trap and Inform PDU types). These deal with notifications concerning information located within a particular context. - Those containing a Response PDU type. Forwarding of Response PDUs always occurs as a result of receiving a response to a previously forwarded message. - Those containing a report indication. Forwarding of report indications always occurs as a result of receiving a report indication for a previously forwarded message.
For the first type, the proxy forwarder's role is to deliver a request for management information to an SNMP engine which is "closer" or "downstream in the path" to the SNMP engine which has access to that information, and to deliver the response containing the information back to the SNMP engine from which the request was received. The context information in a request is used to determine which SNMP engine has access to the requested information, and this is used to determine where and how to forward the request.
For the second type, the proxy forwarder's role is to determine which SNMP engines should receive notifications about management information from a particular location. The context information in a notification message determines the location to which the information contained in the notification applies. This is used to determine which SNMP engines should receive notification about this information.
For the third type, the proxy forwarder's role is to determine which previously forwarded request or notification (if any) the response matches, and to forward the response back to the initiator of the request or notification.
For the fourth type, the proxy forwarder's role is to determine which previously forwarded request or notification (if any) the report indication matches, and to forward the report indication back to the initiator of the request or notification.
When forwarding messages, a proxy forwarder application must perform a translation of incoming management target information into outgoing management target information. How this translation is performed is implementation specific. In many cases, this will be driven by a preconfigured translation table. If a proxy forwarder application makes the contents of this table SNMP manageable, it MUST use the SNMP-PROXY-MIB module defined in this document.
There are two phases for request forwarding. First, the incoming request needs to be passed through the proxy application. Then, the resulting response needs to be passed back. These phases are described in the following two sections.
A proxy forwarder application that wishes to forward request messages
must first register with the Dispatcher using the
registerContextEngineID abstract service interface. The proxy
forwarder must register each contextEngineID for which it wishes to
forward messages, as well as for each pduType. Note that as the
configuration of a proxy forwarder is changed, the particular
contextEngineID values for which it is forwarding may change. The
proxy forwarder should call the registerContextEngineID and
unregisterContextEngineID abstract service interfaces as needed to
reflect its current configuration.
A proxy forwarder application should never attempt to register a value of contextEngineID which is equal to the snmpEngineID of the SNMP engine to which the proxy forwarder is associated.
Once the proxy forwarder has registered for the appropriate contextEngineId values, it can start processing messages. The following procedure is used:
- The messageProcessingModel is the value from the processPdu call. - The securityModel is the value from the processPdu call. - The securityName is the value from the processPdu call. - The securityLevel is the value from the processPdu call. - The contextEngineID is the value from the processPdu call. - The contextName is the value from the processPdu call. - The pduVersion is the value from the processPdu call. - The PDU is an undefined value. - The maxSizeResponseScopedPDU is a local value indicating the maximum size of a ScopedPDU that the application can accept. - The stateReference is the value from the processPdu call. - The statusInformation indicates that an error occurred and includes the OID and value of the snmpProxyDrops object.
Processing of the message stops at this point. Otherwise,
- The transportDomain is that of the outgoing management target. - The transportAddress is that of the outgoing management target. - The messageProcessingModel is that of the outgoing management target. - The securityModel is that of the outgoing management target. - The securityName is that of the outgoing management target. - The securityLevel is that of the outgoing management target. - The contextEngineID is the value originally received. - The contextName is the value originally received. - The pduVersion is the version of the PDU to be sent. - The PDU is the value constructed in step (3) above. - The expectResponse argument indicates that a response is expected. If the sendPdu call is unsuccessful, the proxy forwarder performs the steps described in (2) above. Otherwise:
- The sendPduHandle returned from the call to sendPdu, - The request-id from the received PDU. - the contextEngineID,
- the contextName, - the stateReference, - the incoming management target information, - the outgoing management information, - any other information needed to match an incoming response to the forwarded request.
If this information cannot be cached (possibly due to a lack of resources), the proxy forwarder performs the steps described in (2) above. Otherwise:
A proxy forwarder follows the following procedure when an incoming response is received:
- The messageProcessingModel indicates the Message Processing Model by which the original incoming message was processed. - The securityModel is that of the original incoming management target extracted from the cache. - The securityName is that of the original incoming management target extracted from the cache. - The securityLevel is that of the original incoming management target extracted from the cache. - The contextEngineID is the value extracted from the cache. - The contextName is the value extracted from the cache. - The pduVersion indicates the version of the PDU to be returned. - The PDU is the (possibly translated) Response PDU. - The maxSizeResponseScopedPDU is a local value indicating the maximum size of a ScopedPDU that the application can accept. - The stateReference is the value extracted from the cache. - The statusInformation indicates that no error occurred and that a Response PDU message should be generated.
A proxy forwarder follows the following procedure when an incoming report indication is received:
- The messageProcessingModel indicates the Message Processing Model by which the original incoming message was processed. - The securityModel is that of the original incoming management target extracted from the cache. - The securityName is that of the original incoming management target extracted from the cache. - The securityLevel is that of the original incoming management target extracted from the cache. - The contextEngineID is the value extracted from the cache. - The contextName is the value extracted from the cache. - The pduVersion indicates the version of the PDU to be returned. - The PDU is unused. - The maxSizeResponseScopedPDU is a local value indicating the maximum size of a ScopedPDU that the application can accept. - The stateReference is the value extracted from the cache. - The statusInformation contain the contextEngineID, contextName, counter OID, and counter value received in the report indication.
A proxy forwarder receives notifications in the same manner as a notification receiver application, using the processPdu abstract service interface. The following procedure is used when a notification is received:
The parameters are:
- The messageProcessingModel is the received value. - The securityModel is the received value. - The securityName is the received value. - The securityLevel is the received value. - The contextEngineID is the received value. - The contextName is the received value. - The pduVersion is the received value. - The PDU is an undefined and unused value. - The maxSizeResponseScopedPDU is a local value indicating the maximum size of a ScopedPDU that the application can accept. - The stateReference is the received value. - The statusInformation indicates that an error occurred and that a Report message should be generated.
Processing of the message stops at this point. Otherwise,
- The contextEngineID and contextName values from the original received notification are used. - The outgoing management targets previously determined are used. - No filtering mechanisms are applied.
- The variable-bindings from the original received notification are used, rather than retrieving variable-bindings from local MIB instrumentation. In particular, no access-control is applied to these variable-bindings. - If for any of the outgoing management targets, the incoming SNMP version is SNMPv1 and the outgoing SNMP version is SNMPv2 or SNMPv3, the proxy forwarder must apply the translation rules as documented in [RFC1908]. - If for any of the outgoing management targets, the incoming SNMP version is SNMPv2 or SNMPv3, and the outgoing SNMP version is SNMPv1, this outgoing management target is not used when generating the forwarded notifications.
- None of the generated notifications containing Inform PDUs have been successfully acknowledged within the longest of the time intervals, in which case processing of the original notification is halted, or, - At least one of the generated notifications containing Inform PDUs is successfully acknowledged, in which case a response to the original received notification containing an Inform PDU is generated as described in the following steps.
- The messageProcessingModel is the originally received value. - The securityModel is the originally received value. - The securityName is the originally received value. - The securityLevel is the originally received value.
- The contextEngineID is the originally received value. - The contextName is the originally received value. - The pduVersion indicates the version of the PDU constructed in step (6) above. - The PDU is the value constructed in step (6) above. - The maxSizeResponseScopedPDU is a local value indicating the maximum size of a ScopedPDU that the application can accept. - The stateReference is the originally received value. - The statusInformation indicates that no error occurred and that a Response PDU message should be generated.
There are three separate MIB modules described in this document, the management target MIB, the notification MIB, and the proxy MIB. The following sections describe the structure of these three MIB modules.
The use of these MIBs by particular types of applications is described later in this document:
- The use of the management target MIB and the notification MIB in notification originator applications is described in section 6. - The use of the notification MIB for filtering notifications in notification originator applications is described in section 7. - The use of the management target MIB and the proxy MIB in proxy forwarding applications is described in section 8.
The SNMP-TARGET-MIB module contains objects for defining management targets. It consists of two tables and conformance/compliance statements.
The first table, the snmpTargetAddrTable, contains information about transport domains and addresses. It also contains an object, snmpTargetAddrTagList, which provides a mechanism for grouping entries.
The second table, the snmpTargetParamsTable, contains information about SNMP version and security information to be used when sending messages to particular transport domains and addresses.
The snmpTargetAddrTagList object is used for grouping entries in the snmpTargetAddrTable. The value of this object contains a list of tag values which are used to select target addresses to be used for a particular operation.
A tag value, which may also be used in MIB objects other than snmpTargetAddrTagList, is an arbitrary string of octets, but may not contain a delimiter character. Delimiter characters are defined to be one of the following characters:
- An ASCII space character (0x20). - An ASCII TAB character (0x09). - An ASCII carriage return (CR) character (0x0D). - An ASCII line feed (LF) character (0x0B).
In addition, a tag value may not have a zero length. Generally, a particular MIB object may contain either
- a single tag value, in which case the value of the MIB object may not contain a delimiter character, or: - a MIB object may contain a list of tag values, separated by single delimiter characters.
For a list of tag values, these constraints imply certain restrictions on the value of a MIB object:
- There cannot be a leading or trailing delimiter character. - There cannot be multiple adjacent delimiter charaters.
SNMP-TARGET-MIB DEFINITIONS ::= BEGIN
IMPORTS
TEXTUAL-CONVENTION,
MODULE-IDENTITY,
OBJECT-TYPE,
snmpModules,
Integer32
FROM SNMPv2-SMI
TDomain,
TAddress,
TimeInterval,
RowStatus,
StorageType,
TestAndIncr
FROM SNMPv2-TC
SnmpSecurityModel,
SnmpMessageProcessingModel,
SnmpSecurityLevel,
SnmpAdminString
FROM SNMP-FRAMEWORK-MIB
OBJECT-GROUP
FROM SNMPv2-CONF;
snmpTargetMIB MODULE-IDENTITY
LAST-UPDATED "9711210000Z"
ORGANIZATION "IETF SNMPv3 Working Group"
CONTACT-INFO
"WG-email: snmpv3@tis.com Subscribe: majordomo@tis.com In message body: subscribe snmpv3 Chair: Russ Mundy Trusted Information Systems Postal: 3060 Washington Rd Glenwood MD 21738 USA Email: mundy@tis.com Phone: +1-301-854-6889
Co-editor: David B. Levi
SNMP Research, Inc.
Postal: 3001 Kimberlin Heights Road Knoxville, TN 37920-9716 E-mail: levi@snmp.com Phone: +1 423 573 1434
Co-editor: Paul Meyer
Secure Computing Corporation
Postal: 2675 Long Lake Road Roseville, MN 55113 E-mail: paul_meyer@securecomputing.com
Phone: +1 612 628 1592
Co-editor: Bob Stewart
Cisco Systems, Inc.
Postal: 170 West Tasman Drive San Jose, CA 95134-1706 E-mail: bstewart@cisco.com Phone: +1 603 654 6923" DESCRIPTION "This MIB module defines MIB objects which provide mechanisms to remotely configure the parameters used by an SNMP entity for the generation of SNMP messages." REVISION "9707140000Z" DESCRIPTION "The initial revision." ::= { snmpModules 7 } snmpTargetObjects OBJECT IDENTIFIER ::= { snmpTargetMIB 1 } snmpTargetConformance OBJECT IDENTIFIER ::= { snmpTargetMIB 3 } SnmpTagValue ::= TEXTUAL-CONVENTION DISPLAY-HINT "255a" STATUS current DESCRIPTION "An octet string containing a tag value. Tag values are preferably in human-readable form.
To facilitate internationalization, this information
is represented using the ISO/IEC IS 10646-1 character
set, encoded as an octet string using the UTF-8
character encoding scheme described in RFC 2044.
Since additional code points are added by amendments
to the 10646 standard from time to time,
implementations must be prepared to encounter any code
point from 0x00000000 to 0x7fffffff.
The use of control codes should be avoided, and certain control codes are not allowed as described below.
For code points not directly supported by user
interface hardware or software, an alternative means
of entry and display, such as hexadecimal, may be
provided.
For information encoded in 7-bit US-ASCII, the UTF-8 representation is identical to the US-ASCII encoding.
Note that when this TC is used for an object that is used or envisioned to be used as an index, then a SIZE restriction must be specified so that the number sub-identifiers for any object instance do not exceed the limit of 128, as defined by [RFC1905].
An object of this type contains a single tag value which is used to select a set of entries in a table. A tag value is an arbitrary string of octets, but may not contain a delimiter character. Delimiter characters are defined to be one of the following:
- An ASCII space character (0x20). - An ASCII TAB character (0x09). - An ASCII carriage return (CR) character (0x0D). - An ASCII line feed (LF) character (0x0B).
Delimiter characters are used to separate tag values
in a tag list. An object of this type may only
contain a single tag value, and so delimiter
characters are not allowed in a value of this type.
Some examples of valid tag values are:
- 'acme' - 'router' - 'host'
The use of a tag value to select table entries is application and MIB specific."
SYNTAX OCTET STRING (SIZE (0..255)) SnmpTagList ::= TEXTUAL-CONVENTION DISPLAY-HINT "255a" STATUS current DESCRIPTION "An octet string containing a list of tag values. Tag values are preferably in human-readable form.
To facilitate internationalization, this information
is represented using the ISO/IEC IS 10646-1 character
set, encoded as an octet string using the UTF-8
character encoding scheme described in RFC 2044.
Since additional code points are added by amendments
to the 10646 standard from time to time,
implementations must be prepared to encounter any code
point from 0x00000000 to 0x7fffffff.
The use of control codes should be avoided, except as described below.
For code points not directly supported by user
interface hardware or software, an alternative means
of entry and display, such as hexadecimal, may be
provided.
For information encoded in 7-bit US-ASCII, the UTF-8 representation is identical to the US-ASCII encoding.
An object of this type contains a list of tag values which are used to select a set of entries in a table.
A tag value is an arbitrary string of octets, but may not contain a delimiter character. Delimiter characters are defined to be one of the following:
- An ASCII space character (0x20). - An ASCII TAB character (0x09). - An ASCII carriage return (CR) character (0x0D). - An ASCII line feed (LF) character (0x0B).
Delimiter characters are used to separate tag values in a tag list. Only a single delimiter character may occur between two tag values. A tag value may not have a zero length. These constraints imply certain restrictions on the contents of this object:
- There cannot be a leading or trailing delimiter character. - There cannot be multiple adjacent delimiter characters.
Some examples of valid tag lists are:
- An empty string - 'acme router'
- 'host managerStation'
Note that although a tag value may not have a length of zero, an empty string is still valid. This indicates an empty list (i.e. there are no tag values in the list).
The use of the tag list to select table entries is application and MIB specific. Typically, an application will provide one or more tag values, and any entry which contains some combination of these tag values will be selected."
SYNTAX OCTET STRING (SIZE (0..255)) -- -- -- The snmpTargetObjects group -- --
snmpTargetSpinLock OBJECT-TYPE
SYNTAX TestAndIncr MAX-ACCESS read-write STATUS current DESCRIPTION "This object is used to facilitate modification of table entries in the SNMP-TARGET-MIB module by multiple managers. In particular, it is useful when modifying the value of the snmpTargetAddrTagList object.
The procedure for modifying the snmpTargetAddrTagList object is as follows:
::= { snmpTargetObjects 1 }
snmpTargetAddrTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnmpTargetAddrEntry MAX-ACCESS not-accessible STATUS current
DESCRIPTION
"A table of transport addresses to be used in the generation
of SNMP messages."
::= { snmpTargetObjects 2 }
snmpTargetAddrEntry OBJECT-TYPE
SYNTAX SnmpTargetAddrEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A transport address to be used in the generation of SNMP operations.
Entries in the snmpTargetAddrTable are created and deleted using the snmpTargetAddrRowStatus object." INDEX { IMPLIED snmpTargetAddrName }
::= { snmpTargetAddrTable 1 } SnmpTargetAddrEntry ::= SEQUENCE { snmpTargetAddrName SnmpAdminString, snmpTargetAddrTDomain TDomain, snmpTargetAddrTAddress TAddress, snmpTargetAddrTimeout TimeInterval, snmpTargetAddrRetryCount Integer32, snmpTargetAddrTagList SnmpTagList, snmpTargetAddrParams SnmpAdminString, snmpTargetAddrStorageType StorageType, snmpTargetAddrRowStatus RowStatus }
snmpTargetAddrName OBJECT-TYPE
SYNTAX SnmpAdminString (SIZE(1..32)) MAX-ACCESS not-accessible STATUS current DESCRIPTION "The locally arbitrary, but unique identifier associated with this snmpTargetAddrEntry." ::= { snmpTargetAddrEntry 1 }
snmpTargetAddrTDomain OBJECT-TYPE
SYNTAX TDomain MAX-ACCESS read-create STATUS current DESCRIPTION "This object indicates the transport type of the address contained in the snmpTargetAddrTAddress object." ::= { snmpTargetAddrEntry 2 }
snmpTargetAddrTAddress OBJECT-TYPE
SYNTAX TAddress MAX-ACCESS read-create STATUS current DESCRIPTION "This object contains a transport address. The format of this address depends on the value of the snmpTargetAddrTDomain object." ::= { snmpTargetAddrEntry 3 }
snmpTargetAddrTimeout OBJECT-TYPE
SYNTAX TimeInterval MAX-ACCESS read-create STATUS current DESCRIPTION "This object should reflect the expected maximum round trip time for communicating with the transport address defined by this row. When a message is sent to this address, and a response (if one is expected) is not received within this time period, an implementation may assume that the response will not be delivered.
Note that the time interval that an application waits for a response may actually be derived from the value of this object. The method for deriving the actual time interval is implementation dependent. One such method is to derive the expected round trip time based on a particular retransmission algorithm and on the number of timeouts which have occurred. The type of message may also be considered when deriving expected round trip times for retransmissions. For example, if a message is being sent with a securityLevel that indicates both authentication and privacy, the derived value may be increased to compensate for extra processing time spent during authentication and encryption processing." DEFVAL { 1500 }
::= { snmpTargetAddrEntry 4 }
snmpTargetAddrRetryCount OBJECT-TYPE
SYNTAX Integer32 (0..255) MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies a default number of retries to be attempted when a response is not received for a generated message. An application may provide its own retry count, in which case the value of this object is ignored." DEFVAL { 3 }
::= { snmpTargetAddrEntry 5 }
snmpTargetAddrTagList OBJECT-TYPE
SYNTAX SnmpTagList MAX-ACCESS read-create STATUS current DESCRIPTION "This object contains a list of tag values which are used to select target addresses for a particular operation." ::= { snmpTargetAddrEntry 6 }
snmpTargetAddrParams OBJECT-TYPE
SYNTAX SnmpAdminString (SIZE(1..32)) MAX-ACCESS read-create STATUS current DESCRIPTION "The value of this object identifies an entry in the snmpTargetParamsTable. The identified entry contains SNMP parameters to be used when generating messages to be sent to this transport address." ::= { snmpTargetAddrEntry 7 }
snmpTargetAddrStorageType OBJECT-TYPE
SYNTAX StorageType MAX-ACCESS read-create STATUS current DESCRIPTION "The storage type for this conceptual row." ::= { snmpTargetAddrEntry 8 }
snmpTargetAddrRowStatus OBJECT-TYPE
SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The status of this conceptual row.
To create a row in this table, a manager must
set this object to either createAndGo(4) or
createAndWait(5).
Until instances of all corresponding columns are
appropriately configured, the value of the
corresponding instance of the snmpTargetAddrRowStatus
column is 'notReady'.
In particular, a newly created row cannot be made
active until the corresponding snmpTargetAddrTDomain and snmpTargetAddrTAddress have both been set.
The following objects may not be modified while the value of this object is active(1):
- snmpTargetAddrTDomain - snmpTargetAddrTAddress" ::= { snmpTargetAddrEntry 9 }
snmpTargetParamsTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnmpTargetParamsEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A table of SNMP target information to be used in the generation of SNMP messages." ::= { snmpTargetObjects 3 }
snmpTargetParamsEntry OBJECT-TYPE
SYNTAX SnmpTargetParamsEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A set of SNMP target information.
Entries in the snmpTargetParamsTable are created and deleted using the snmpTargetParamsRowStatus object." INDEX { IMPLIED snmpTargetParamsName }
::= { snmpTargetParamsTable 1 } SnmpTargetParamsEntry ::= SEQUENCE { snmpTargetParamsName SnmpAdminString, snmpTargetParamsMPModel SnmpMessageProcessingModel, snmpTargetParamsSecurityModel SnmpSecurityModel, snmpTargetParamsSecurityName SnmpAdminString, snmpTargetParamsSecurityLevel SnmpSecurityLevel, snmpTargetParamsStorageType StorageType, snmpTargetParamsRowStatus RowStatus }
snmpTargetParamsName OBJECT-TYPE
SYNTAX SnmpAdminString (SIZE(1..32)) MAX-ACCESS not-accessible STATUS current DESCRIPTION "The locally arbitrary, but unique identifier associated with this snmpTargetParamsEntry." ::= { snmpTargetParamsEntry 1 }
snmpTargetParamsMPModel OBJECT-TYPE
SYNTAX SnmpMessageProcessingModel MAX-ACCESS read-create STATUS current DESCRIPTION "The Message Processing Model to be used when generating SNMP messages using this entry." ::= { snmpTargetParamsEntry 2 }
snmpTargetParamsSecurityModel OBJECT-TYPE
SYNTAX SnmpSecurityModel (0..254 | 256..2147483647) MAX-ACCESS read-create STATUS current DESCRIPTION "The Security Model to be used when generating SNMP messages using this entry." ::= { snmpTargetParamsEntry 3 }
snmpTargetParamsSecurityName OBJECT-TYPE
SYNTAX SnmpAdminString MAX-ACCESS read-create STATUS current DESCRIPTION "The securityName which identifies the Principal on whose behalf SNMP messages will be generated using this entry." ::= { snmpTargetParamsEntry 4 }
snmpTargetParamsSecurityLevel OBJECT-TYPE
SYNTAX SnmpSecurityLevel MAX-ACCESS read-create STATUS current DESCRIPTION "The Level of Security to be used when generating SNMP messages using this entry." ::= { snmpTargetParamsEntry 5 }
snmpTargetParamsStorageType OBJECT-TYPE
SYNTAX StorageType MAX-ACCESS read-create STATUS current DESCRIPTION "The storage type for this conceptual row." ::= { snmpTargetParamsEntry 6 }
snmpTargetParamsRowStatus OBJECT-TYPE
SYNTAX RowStatus MAX-ACCESS read-create
STATUS current DESCRIPTION "The status of this conceptual row.
To create a row in this table, a manager must
set this object to either createAndGo(4) or
createAndWait(5).
Until instances of all corresponding columns are
appropriately configured, the value of the
corresponding instance of the snmpTargetParamsRowStatus
column is 'notReady'.
In particular, a newly created row cannot be made
active until the corresponding
snmpTargetParamsMPModel,
snmpTargetParamsSecurityModel,
snmpTargetParamsSecurityName,
and snmpTargetParamsSecurityLevel have all been set.
The following objects may not be modified while the value of this object is active(1):
- snmpTargetParamsMPModel - snmpTargetParamsSecurityModel - snmpTargetParamsSecurityName - snmpTargetParamsSecurityLevel" ::= { snmpTargetParamsEntry 7 }
snmpUnavailableContexts OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of packets received by the SNMP engine which were dropped because the context contained in the mesage was unavailable." ::= { snmpTargetObjects 4 }
snmpUnknownContexts OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of packets received by the SNMP engine which were dropped because the context contained in the mesage was unknown." ::= { snmpTargetObjects 5 }
-- -- -- Conformance information -- -- snmpTargetCompliances OBJECT IDENTIFIER ::= { snmpTargetConformance 1 } snmpTargetGroups OBJECT IDENTIFIER ::= { snmpTargetConformance 2 } -- -- -- Compliance statements -- --
snmpTargetCommandResponderCompliance MODULE-COMPLIANCE
STATUS current DESCRIPTION "The compliance statement for SNMP entities which include a command responder application." MODULE -- This Module MANDATORY-GROUPS { snmpTargetCommandResponderGroup } ::= { snmpTargetCompliances 1 }
snmpTargetBasicGroup OBJECT-GROUP
OBJECTS {
snmpTargetSpinLock,
snmpTargetAddrTDomain,
snmpTargetAddrTAddress,
snmpTargetAddrTagList,
snmpTargetAddrParams,
snmpTargetAddrStorageType,
snmpTargetAddrRowStatus,
snmpTargetParamsMPModel,
snmpTargetParamsSecurityModel,
snmpTargetParamsSecurityName,
snmpTargetParamsSecurityLevel,
snmpTargetParamsStorageType,
snmpTargetParamsRowStatus
}
STATUS current DESCRIPTION
"A collection of objects providing basic remote
configuration of management targets."
::= { snmpTargetGroups 1 }
snmpTargetResponseGroup OBJECT-GROUP
OBJECTS {
snmpTargetAddrTimeout,
snmpTargetAddrRetryCount
}
STATUS current DESCRIPTION "A collection of objects providing remote configuration of management targets for applications which generate SNMP messages for which a response message would be expected." ::= { snmpTargetGroups 2 }
snmpTargetCommandResponderGroup OBJECT-GROUP
OBJECTS {
snmpUnavailableContexts,
snmpUnknownContexts
}
STATUS current DESCRIPTION "A collection of objects required for command responder applications, used for counting error conditions." ::= { snmpTargetGroups 3 }
END
The SNMP-NOTIFICATION-MIB module contains objects for the remote
configuration of the parameters used by an SNMP entity for the
generation of notifications. It consists of three tables and
conformance/compliance statements. The first table, the
snmpNotifyTable, contains entries which select which entries in the
snmpTargetAddrTable should be used for generating notifications, and
the type of notifications to be generated.
The second table sparsely augments the snmpTargetAddrTable with an object which is used to associate a set of filters with a particular management target.
The third table defines filters which are used to limit the number of notifications which are generated using particular management targets.
SNMP-NOTIFICATION-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY,
OBJECT-TYPE,
snmpModules
FROM SNMPv2-SMI
RowStatus,
StorageType
FROM SNMPv2-TC
SnmpAdminString
FROM SNMP-FRAMEWORK-MIB
SnmpTagValue,
snmpTargetParamsName
FROM SNMP-TARGET-MIB
MODULE-COMPLIANCE,
OBJECT-GROUP
FROM SNMPv2-CONF;
snmpNotificationMIB MODULE-IDENTITY
LAST-UPDATED "9711210000Z"
ORGANIZATION "IETF SNMPv3 Working Group"
CONTACT-INFO
"WG-email: snmpv3@tis.com Subscribe: majordomo@tis.com In message body: subscribe snmpv3 Chair: Russ Mundy Trusted Information Systems Postal: 3060 Washington Rd Glenwood MD 21738 USA Email: mundy@tis.com Phone: +1-301-854-6889
Co-editor: David B. Levi
SNMP Research, Inc.
Postal: 3001 Kimberlin Heights Road Knoxville, TN 37920-9716 E-mail: levi@snmp.com Phone: +1 423 573 1434
Co-editor: Paul Meyer
Secure Computing Corporation
Postal: 2675 Long Lake Road Roseville, MN 55113 E-mail: paul_meyer@securecomputing.com Phone: +1 612 628 1592
Co-editor: Bob Stewart
Cisco Systems, Inc.
Postal: 170 West Tasman Drive San Jose, CA 95134-1706 E-mail: bstewart@cisco.com Phone: +1 603 654 6923" DESCRIPTION "This MIB module defines MIB objects which provide mechanisms to remotely configure the parameters used by an SNMP entity for the generation of notifications." REVISION "9707140000Z" DESCRIPTION "The initial revision." ::= { snmpModules 8 } snmpNotifyObjects OBJECT IDENTIFIER ::= { snmpNotificationMIB 1 } snmpNotifyConformance OBJECT IDENTIFIER ::= { snmpNotificationMIB 3 } -- -- -- The snmpNotifyObjects group -- --
snmpNotifyTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnmpNotifyEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table is used to select management targets which should receive notifications, as well as the type of notification which should be sent to each selected management target." ::= { snmpNotifyObjects 1 }
snmpNotifyEntry OBJECT-TYPE
SYNTAX SnmpNotifyEntry MAX-ACCESS not-accessible
STATUS current DESCRIPTION "An entry in this table selects a set of management targets which should receive notifications, as well as the type of notification which should be sent to each selected management target.
Entries in the snmpNotifyTable are created and
deleted using the snmpNotifyRowStatus object."
INDEX { IMPLIED snmpNotifyName }
::= { snmpNotifyTable 1 } SnmpNotifyEntry ::= SEQUENCE { snmpNotifyName SnmpAdminString, snmpNotifyTag SnmpTagValue, snmpNotifyType INTEGER, snmpNotifyStorageType StorageType, snmpNotifyRowStatus RowStatus }
snmpNotifyName OBJECT-TYPE
SYNTAX SnmpAdminString (SIZE(1..32)) MAX-ACCESS not-accessible STATUS current DESCRIPTION "The locally arbitrary, but unique identifier associated with this snmpNotifyEntry." ::= { snmpNotifyEntry 1 }
snmpNotifyTag OBJECT-TYPE
SYNTAX SnmpTagValue MAX-ACCESS read-create STATUS current DESCRIPTION "This object contains a single tag value which is used to select entries in the snmpTargetAddrTable. Any entry in the snmpTargetAddrTable which contains a tag value which is equal to the value of an instance of this object is selected. If this object contains a value of zero length, no entries are selected." ::= { snmpNotifyEntry 2 }
snmpNotifyType OBJECT-TYPE
SYNTAX INTEGER { trap(1), inform(2) } MAX-ACCESS read-create
STATUS current DESCRIPTION "This object determines the type of notification to be generated for entries in the snmpTargetAddrTable selected by the corresponding instance of snmpNotifyTag.
If the value of this object is trap(1), then any messages generated for selected rows will contain SNMPv2-Trap PDUs.
If the value of this object is inform(2), then any messages generated for selected rows will contain Inform PDUs.
Note that if an SNMP entity only supports
generation of traps (and not informs), then this
object may be read-only."
DEFVAL { trap }
::= { snmpNotifyEntry 3 }
snmpNotifyStorageType OBJECT-TYPE
SYNTAX StorageType MAX-ACCESS read-create STATUS current DESCRIPTION "The storage type for this conceptual row." ::= { snmpNotifyEntry 4 }
snmpNotifyRowStatus OBJECT-TYPE
SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The status of this conceptual row.
To create a row in this table, a manager must
set this object to either createAndGo(4) or
createAndWait(5).
Until instances of all corresponding columns are
appropriately configured, the value of the
corresponding instance of the snmpNotifyRowStatus
column is 'notReady'.
In particular, a newly created row cannot be made active until the corresponding snmpNotifyTag has been set."
::= { snmpNotifyEntry 5 }
snmpNotifyFilterProfileTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnmpNotifyFilterProfileEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table is used to associate a notification filter profile with a particular set of target parameters." ::= { snmpNotifyObjects 2 }
snmpNotifyFilterProfileEntry OBJECT-TYPE
SYNTAX SnmpNotifyFilterProfileEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in this table indicates the name of the filter profile to be used when generating notifications using the corresponding entry in the snmpTargetParamsTable.
Entries in the snmpNotifyFilterProfileTable are created
and deleted using the snmpNotifyFilterProfileRowStatus
object."
INDEX { IMPLIED snmpTargetParamsName }
::= { snmpNotifyFilterProfileTable 1 } SnmpNotifyFilterProfileEntry ::= SEQUENCE { snmpNotifyFilterProfileName SnmpAdminString, snmpNotifyFilterProfileStorType StorageType, snmpNotifyFilterProfileRowStatus RowStatus }
snmpNotifyFilterProfileName OBJECT-TYPE
SYNTAX SnmpAdminString (SIZE(1..32)) MAX-ACCESS read-create STATUS current DESCRIPTION "The name of the filter profile to be used when generating notifications using the corresponding entry in the snmpTargetAddrTable." ::= { snmpNotifyFilterProfileEntry 1 }
snmpNotifyFilterProfileStorType OBJECT-TYPE
SYNTAX StorageType MAX-ACCESS read-create STATUS current DESCRIPTION "The storage type of this conceptual row."
::= { snmpNotifyFilterProfileEntry 2 }
snmpNotifyFilterProfileRowStatus OBJECT-TYPE
SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The status of this conceptual row.
To create a row in this table, a manager must
set this object to either createAndGo(4) or
createAndWait(5)."
::= { snmpNotifyFilterProfileEntry 3 }
snmpNotifyFilterTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnmpNotifyFilterEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The table of filter profiles. Filter profiles are used to determine whether particular management targets should receive particular notifications.
When a notification is generated, it must be compared
with the filters associated with each management target
which is configured to receive notifications. If the
notification is matched by a filter, it is not sent to
the management target with which the filter is
associated."
::= { snmpNotifyObjects 3 }
snmpNotifyFilterEntry OBJECT-TYPE
SYNTAX SnmpNotifyFilterEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An element of a filter profile.
Entries in the snmpNotifyFilterTable are created and deleted using the snmpNotifyFilterRowStatus object."
INDEX { snmpNotifyFilterProfileName, IMPLIED snmpNotifyFilterSubtree } ::= { snmpNotifyFilterTable 1 } SnmpNotifyFilterEntry ::= SEQUENCE { snmpNotifyFilterSubtree OBJECT IDENTIFIER, snmpNotifyFilterMask OCTET STRING, snmpNotifyFilterType INTEGER,
snmpNotifyFilterStorageType StorageType, snmpNotifyFilterRowStatus RowStatus }
snmpNotifyFilterSubtree OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER MAX-ACCESS not-accessible STATUS current DESCRIPTION "The MIB subtree which, when combined with the corresponding instance of snmpNotifyFilterMask, defines a family of subtrees which are included in or excluded from the filter profile." ::= { snmpNotifyFilterEntry 1 }
snmpNotifyFilterMask OBJECT-TYPE
SYNTAX OCTET STRING (SIZE(0..16)) MAX-ACCESS read-create STATUS current DESCRIPTION "The bit mask which, in combination with the corresponding instance of snmpNotifyFilterSubtree, defines a family of subtrees which are included in or excluded from the filter profile.
Each bit of this bit mask corresponds to a
sub-identifier of snmpNotifyFilterSubtree, with the
most significant bit of the i-th octet of this octet
string value (extended if necessary, see below)
corresponding to the (8*i - 7)-th sub-identifier, and
the least significant bit of the i-th octet of this
octet string corresponding to the (8*i)-th
sub-identifier, where i is in the range 1 through 16.
Each bit of this bit mask specifies whether or not the corresponding sub-identifiers must match when determining if an OBJECT IDENTIFIER matches this family of filter subtrees; a '1' indicates that an exact match must occur; a '0' indicates 'wild card', i.e., any sub-identifier value matches.
Thus, the OBJECT IDENTIFIER X of an object instance
is contained in a family of filter subtrees if, for
each sub-identifier of the value of
snmpNotifyFilterSubtree, either:
the i-th bit of snmpNotifyFilterMask is 0, or
the i-th sub-identifier of X is equal to the i-th
sub-identifier of the value of
snmpNotifyFilterSubtree.
If the value of this bit mask is M bits long and
there are more than M sub-identifiers in the
corresponding instance of snmpNotifyFilterSubtree,
then the bit mask is extended with 1's to be the
required length.
Note that when the value of this object is the
zero-length string, this extension rule results in
a mask of all-1's being used (i.e., no 'wild card'),
and the family of filter subtrees is the one
subtree uniquely identified by the corresponding
instance of snmpNotifyFilterSubtree."
DEFVAL { ''H }
::= { snmpNotifyFilterEntry 2 }
snmpNotifyFilterType OBJECT-TYPE
SYNTAX INTEGER { included(1), excluded(2) } MAX-ACCESS read-create STATUS current DESCRIPTION "This object indicates whether the family of filter subtrees defined by this entry are included in or excluded from a filter." DEFVAL { included } ::= { snmpNotifyFilterEntry 3 }
snmpNotifyFilterStorageType OBJECT-TYPE
SYNTAX StorageType MAX-ACCESS read-create STATUS current DESCRIPTION "The storage type of this conceptual row." ::= { snmpNotifyFilterEntry 4 }
snmpNotifyFilterRowStatus OBJECT-TYPE
SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The status of this conceptual row.
To create a row in this table, a manager must
set this object to either createAndGo(4) or
createAndWait(5)."
::= { snmpNotifyFilterEntry 5 } -- -- -- Conformance information -- -- snmpNotifyCompliances OBJECT IDENTIFIER ::= { snmpNotifyConformance 1 } snmpNotifyGroups OBJECT IDENTIFIER ::= { snmpNotifyConformance 2 } -- -- -- Compliance statements -- --
snmpNotifyBasicCompliance MODULE-COMPLIANCE
STATUS current DESCRIPTION "The compliance statement for minimal SNMP entities which implement only SNMP Traps and read-create operations on only the snmpTargetAddrTable." MODULE SNMP-TARGET-MIB MANDATORY-GROUPS { snmpTargetBasicGroup }
OBJECT snmpTargetParamsMPModel
MIN-ACCESS read-only DESCRIPTION "Create/delete/modify access is not required."
OBJECT snmpTargetParamsSecurityModel
MIN-ACCESS read-only DESCRIPTION "Create/delete/modify access is not required."
OBJECT snmpTargetParamsSecurityName
MIN-ACCESS read-only DESCRIPTION "Create/delete/modify access is not required."
OBJECT snmpTargetParamsSecurityLevel
MIN-ACCESS read-only
DESCRIPTION
"Create/delete/modify access is not required."
OBJECT snmpTargetParamsStorageType
SYNTAX INTEGER {
readOnly(5)
}
MIN-ACCESS read-only DESCRIPTION "Create/delete/modify access is not required. Support of the values other(1), volatile(2), nonVolatile(3), and permanent(4) is not required."
OBJECT snmpTargetParamsRowStatus
SYNTAX INTEGER {
active(1)
}
MIN-ACCESS read-only DESCRIPTION "Create/delete/modify access to the snmpTargetParamsTable is not required. Support of the values notInService(2), notReady(3), createAndGo(4), createAndWait(5), and destroy(6) is not required."
MODULE -- This Module
MANDATORY-GROUPS { snmpNotifyGroup }
OBJECT snmpNotifyTag
MIN-ACCESS read-only DESCRIPTION "Create/delete/modify access is not required."
OBJECT snmpNotifyType
SYNTAX INTEGER {
trap(1)
}
MIN-ACCESS read-only DESCRIPTION "Create/delete/modify access is not required. Support of the value notify(2) is not required."
OBJECT snmpNotifyStorageType
SYNTAX INTEGER {
readOnly(5)
}
MIN-ACCESS read-only DESCRIPTION
"Create/delete/modify access is not required. Support of the values other(1), volatile(2), nonVolatile(3), and permanent(4) is not required."
OBJECT snmpNotifyRowStatus
SYNTAX INTEGER {
active(1)
}
MIN-ACCESS read-only DESCRIPTION "Create/delete/modify access to the snmpNotifyTable is not required. Support of the values notInService(2), notReady(3), createAndGo(4), createAndWait(5), and destroy(6) is not required." ::= { snmpNotifyCompliances 1 }
snmpNotifyBasicFiltersCompliance MODULE-COMPLIANCE
STATUS current DESCRIPTION "The compliance statement for SNMP entities which implement SNMP Traps with filtering, and read-create operations on all related tables." MODULE SNMP-TARGET-MIB MANDATORY-GROUPS { snmpTargetBasicGroup } MODULE -- This Module MANDATORY-GROUPS { snmpNotifyGroup, snmpNotifyFilterGroup } ::= { snmpNotifyCompliances 2 }
snmpNotifyFullCompliance MODULE-COMPLIANCE
STATUS current DESCRIPTION "The compliance statement for SNMP entities which either implement only SNMP Informs, or both SNMP Traps and SNMP Informs, plus filtering and read-create operations on all related tables." MODULE SNMP-TARGET-MIB MANDATORY-GROUPS { snmpTargetBasicGroup, snmpTargetResponseGroup } MODULE -- This Module MANDATORY-GROUPS { snmpNotifyGroup, snmpNotifyFilterGroup } ::= { snmpNotifyCompliances 3 }
snmpNotifyGroup OBJECT-GROUP
OBJECTS {
snmpNotifyTag,
snmpNotifyType,
snmpNotifyStorageType,
snmpNotifyRowStatus
}
STATUS current DESCRIPTION "A collection of objects for selecting which management targets are used for generating notifications, and the type of notification to be generated for each selected management target." ::= { snmpNotifyGroups 1 }
snmpNotifyFilterGroup OBJECT-GROUP
OBJECTS {
snmpNotifyFilterProfileName,
snmpNotifyFilterProfileStorType,
snmpNotifyFilterProfileRowStatus,
snmpNotifyFilterMask,
snmpNotifyFilterType,
snmpNotifyFilterStorageType,
snmpNotifyFilterRowStatus
}
STATUS current DESCRIPTION "A collection of objects providing remote configuration of notification filters." ::= { snmpNotifyGroups 2 }
END
The SNMP-PROXY-MIB module, which defines MIB objects that provide mechanisms to remotely configure the parameters used by an SNMP entity for proxy forwarding operations, contains a single table. This table, snmpProxyTable, is used to define translations between management targets for use when forwarding messages.
SNMP-PROXY-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY,
OBJECT-TYPE,
snmpModules
FROM SNMPv2-SMI
RowStatus,
StorageType
FROM SNMPv2-TC
SnmpEngineID,
SnmpAdminString
FROM SNMP-FRAMEWORK-MIB
SnmpTagValue,
FROM SNMP-TARGET-MIB
MODULE-COMPLIANCE,
OBJECT-GROUP
FROM SNMPv2-CONF;
snmpProxyMIB MODULE-IDENTITY
LAST-UPDATED "9711210000Z"
ORGANIZATION "IETF SNMPv3 Working Group"
CONTACT-INFO
"WG-email: snmpv3@tis.com Subscribe: majordomo@tis.com In message body: subscribe snmpv3 Chair: Russ Mundy Trusted Information Systems Postal: 3060 Washington Rd Glenwood MD 21738 USA Email: mundy@tis.com Phone: +1-301-854-6889
Co-editor: David B. Levi
SNMP Research, Inc.
Postal: 3001 Kimberlin Heights Road Knoxville, TN 37920-9716 E-mail: levi@snmp.com Phone: +1 423 573 1434
Co-editor: Paul Meyer
Secure Computing Corporation
Postal: 2675 Long Lake Road Roseville, MN 55113 E-mail: paul_meyer@securecomputing.com Phone: +1 612 628 1592
Co-editor: Bob Stewart
Cisco Systems, Inc.
Postal: 170 West Tasman Drive
San Jose, CA 95134-1706
E-mail: bstewart@cisco.com Phone: +1 603 654 6923" DESCRIPTION "This MIB module defines MIB objects which provide mechanisms to remotely configure the parameters used by a proxy forwarding application." REVISION "9707140000Z" DESCRIPTION "The initial revision." ::= { snmpModules 9 } snmpProxyObjects OBJECT IDENTIFIER ::= { snmpProxyMIB 1 } snmpProxyConformance OBJECT IDENTIFIER ::= { snmpProxyMIB 3 } -- -- -- The snmpProxyObjects group -- --
snmpProxyTable OBJECT-TYPE
SYNTAX SEQUENCE OF SnmpProxyEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The table of translation parameters used by proxy forwarder applications for forwarding SNMP messages." ::= { snmpProxyObjects 2 }
snmpProxyEntry OBJECT-TYPE
SYNTAX SnmpProxyEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A set of translation parameters used by a proxy forwarder application for forwarding SNMP messages.
Entries in the snmpProxyTable are created and deleted
using the snmpProxyRowStatus object."
INDEX { IMPLIED snmpProxyName }
::= { snmpProxyTable 1 } SnmpProxyEntry ::= SEQUENCE { snmpProxyName SnmpAdminString, snmpProxyType INTEGER, snmpProxyContextEngineID SnmpEngineID, snmpProxyContextName SnmpAdminString,
snmpProxyTargetParamsIn SnmpAdminString, snmpProxySingleTargetOut SnmpAdminString, snmpProxyMultipleTargetOut SnmpTagValue, snmpProxyStorageType StorageType, snmpProxyRowStatus RowStatus }
snmpProxyName OBJECT-TYPE
SYNTAX SnmpAdminString (SIZE(1..32)) MAX-ACCESS not-accessible STATUS current DESCRIPTION "The locally arbitrary, but unique identifier associated with this snmpProxyEntry." ::= { snmpProxyEntry 1 }
snmpProxyType OBJECT-TYPE
SYNTAX INTEGER { read(1), write(2), trap(3), inform(4) } MAX-ACCESS read-create STATUS current DESCRIPTION "The type of message that may be forwarded using the translation parameters defined by this entry." ::= { snmpProxyEntry 2 }
snmpProxyContextEngineID OBJECT-TYPE
SYNTAX SnmpEngineID MAX-ACCESS read-create STATUS current DESCRIPTION "The contextEngineID contained in messages that may be forwarded using the translation parameters defined by this entry." ::= { snmpProxyEntry 3 }
snmpProxyContextName OBJECT-TYPE
SYNTAX SnmpAdminString MAX-ACCESS read-create STATUS current DESCRIPTION "The contextName contained in messages that may be forwarded using the translation parameters defined by this entry.
This object is optional, and if not supported, the contextName contained in a message is ignored when selecting an entry in the snmpProxyTable."
::= { snmpProxyEntry 4 }
snmpProxyTargetParamsIn OBJECT-TYPE
SYNTAX SnmpAdminString MAX-ACCESS read-create STATUS current DESCRIPTION "This object selects an entry in the snmpTargetParamsTable. The selected entry is used to determine which row of the snmpProxyTable to use for forwarding received messages." ::= { snmpProxyEntry 5 }
snmpProxySingleTargetOut OBJECT-TYPE
SYNTAX SnmpAdminString MAX-ACCESS read-create STATUS current DESCRIPTION "This object selects a management target defined in the snmpTargetAddrTable (in the SNMP-TARGET-MIB). The selected target is defined by an entry in the snmpTargetAddrTable whose index value (snmpTargetAddrName) is equal to this object.
This object is only used when selection of a single target is required (i.e. when forwarding an incoming read or write request)."
::= { snmpProxyEntry 6 }
snmpProxyMultipleTargetOut OBJECT-TYPE
SYNTAX SnmpTagValue MAX-ACCESS read-create STATUS current DESCRIPTION "This object selects a set of management targets defined in the snmpTargetAddrTable (in the SNMP-TARGET-MIB).
This object is only used when selection of multiple targets is required (i.e. when forwarding an incoming notification)."
::= { snmpProxyEntry 7 }
snmpProxyStorageType OBJECT-TYPE
SYNTAX StorageType MAX-ACCESS read-create STATUS current
DESCRIPTION
"The storage type of this conceptual row."
::= { snmpProxyEntry 8 }
snmpProxyRowStatus OBJECT-TYPE
SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The status of this conceptual row.
To create a row in this table, a manager must
set this object to either createAndGo(4) or
createAndWait(5).
The following objects may not be modified while the value of this object is active(1):
- snmpProxyType - snmpProxyContextEngineID - snmpProxyContextName - snmpProxyTargetParamsIn - snmpProxySingleTargetOut - snmpProxyMultipleTargetOut" ::= { snmpProxyEntry 9 } -- -- -- Conformance information -- -- snmpProxyCompliances OBJECT IDENTIFIER ::= { snmpProxyConformance 1 } snmpProxyGroups OBJECT IDENTIFIER ::= { snmpProxyConformance 2 } -- -- -- Compliance statements -- --
snmpProxyCompliance MODULE-COMPLIANCE
STATUS current DESCRIPTION "The compliance statement for SNMP entities which include a proxy forwarding application."
MODULE SNMP-TARGET-MIB
MANDATORY-GROUPS { snmpTargetBasicGroup,
snmpTargetResponseGroup }
MODULE -- This Module
MANDATORY-GROUPS { snmpProxyGroup }
::= { snmpProxyCompliances 1 }
snmpProxyGroup OBJECT-GROUP
OBJECTS {
snmpProxyType,
snmpProxyContextEngineID,
snmpProxyContextName,
snmpProxyTargetParamsIn,
snmpProxySingleTargetOut,
snmpProxyMultipleTargetOut,
snmpProxyStorageType,
snmpProxyRowStatus
}
STATUS current DESCRIPTION "A collection of objects providing remote configuration of management target translation parameters for use by proxy forwarder applications." ::= { snmpProxyGroups 3 }
END
This section describes the mechanisms used by a notification originator application when using the MIB module described in this document to determine the set of management targets to be used when generating a notification.
A notification originator uses the snmpNotifyTable to find the management targets to be used for generating notifications. Each active entry in this table identifies zero or more entries in the snmpTargetAddrTable. Any entry in the snmpTargetAddrTable whose snmpTargetAddrTagList object contains a tag value which is equal to a value of snmpNotifyTag is selected by the snmpNotifyEntry which contains that instance of snmpNotifyTag. Note that a particular snmpTargetAddrEntry may be selected by multiple entries in the snmpNotifyTable, resulting in multiple notifications being generated using that snmpTargetAddrEntry.
Each snmpTargetAddrEntry contains a pointer to the
snmpTargetParamsTable (snmpTargetAddrParams). This pointer selects a
set of SNMP parameters to be used for generating notifications. If
the selected entry in the snmpTargetParamsTable does not exist, the
management target is not used to generate notifications.
The decision as to whether a notification should contain an SNMPv2- Trap or Inform PDU is determined by the value of the snmpNotifyType object. If the value of this object is trap(1), the notification should contain an SNMPv2-Trap PDU. If the value of this object is inform(2), then the notification should contain an Inform PDU, and the timeout time and number of retries for the Inform are the value of snmpTargetAddrTimeout and snmpTargetAddrRetryCount. Note that the exception to these rules is when the snmpTargetParamsMPModel object indicates SNMPv1. In this case, the notification is sent as a Trap if the value of snmpNotifyTargetType is either trap(1) or inform(2).
This section describes the mechanisms used by a notification originator application when using the MIB module described in this document to filter generation of notifications.
A notification originator uses the snmpNotifyFilterTable to filter
notifications. A notification filter profile may be associated with
a particular entry in the snmpTargetParamsTable. The associated
filter profile is identified by an entry in the
snmpNotifyFilterProfileTable whose index is equal to the index of the
entry in the snmpTargetParamsTable. If no such entry exists in the
snmpNotifyFilterProfileTable, no filtering is performed for that
management target.
If such an entry does exist, the value of snmpNotifyFilterProfileName
of the entry is compared with the corresponding portion of the index
of all active entries in the snmpNotifyFilterTable. All such entries
for which this comparison results in an exact match are used for
filtering a notification generated using the associated
snmpTargetParamsEntry. If no such entries exist, no filtering is
performed, and a notification may be sent to the management target.
Otherwise, if matching entries do exist, a notification may be sent if the NOTIFICATION-TYPE OBJECT IDENTIFIER of the notification (this is the value of the element of the variable bindings whose name is snmpTrapOID.0, i.e., the second variable binding), and all of the object instances to be included in the variable-bindings of the notification, are not specifically excluded by the matching entries.
Each set of snmpNotifyFilterTable entries is divided into two collections of filter subtrees: the included filter subtrees, and the excluded filter subtrees. The snmpNotifyFilterType object defines the collection to which each matching entry belongs.
To determine whether a particular notification name or object instance is excluded by the set of matching entries, compare the notification name's or object instance's OBJECT IDENTIFIER with each of the matching entries. If none match, then the notification name or object instance is considered excluded, and the notification should not be sent to this management target. If one or more match, then the notification name or object instance is included or excluded, according to the value of snmpNotifyFilterType in the entry whose value of snmpNotifyFilterSubtree has the most sub-identifiers. If multiple entries match and have the same number of sub- identifiers, then the lexicographically greatest instance of snmpNotifyFilterType among those which match determines the inclusion or exclusion.
A notification name's or object instance's OBJECT IDENTIFIER X matches an entry in the snmpNotifyFilterTable when the number of sub-identifiers in X is at least as many as in the value of snmpNotifyFilterSubtree for the entry, and each sub-identifier in the value of snmpNotifyFilterSubtree matches its corresponding sub- identifier in X. Two sub-identifiers match either if the corresponding bit of snmpNotifyFilterMask is zero (the 'wild card' value), or if the two sub-identifiers are equal.
This section describes the mechanisms used by a proxy forwarder application when using the MIB module described in this document to translate incoming management target information into outgoing management target information for the purpose of forwarding messages. There are actually two mechanisms a proxy forwarder may use, one for forwarding request messages, and one for forwarding notification messages.
When forwarding request messages, the proxy forwarder will select a single entry in the snmpProxyTable. To select this entry, it will perform the following comparisons:
- The snmpProxyType must be read(1) if the request is a Get, GetNext, or GetBulk request. The snmpProxyType must be write(2) if the request is a Set request.
- The contextEngineId must equal the snmpProxyContextEngineID object. - If the snmpProxyContextName object is supported, it must equal the contextName. - The snmpProxyTargetParamsIn object identifies an entry in the snmpTargetParamsTable. The messageProcessingModel, securityLevel, security model, and securityName must match the values of snmpTargetParamsMPModel, snmpTargetParamsSecurityModel, snmpTargetParamsSecurityName, and snmpTargetParamsSecurityLevel of the identified entry in the snmpTargetParamsTable.
There may be multiple entries in the snmpProxyTable for which these comparisons succeed. The entry whose snmpProxyName has the lexicographically smallest value and for which the comparisons succeed will be selected by the proxy forwarder.
The outgoing management target information is identified by the value of the snmpProxySingleTargetOut object of the selected entry. This object identifies an entry in the snmpTargetAddrTable. The identified entry in the snmpTargetAddrTable also contains a reference to the snmpTargetParamsTable (snmpTargetAddrParams). If either the identified entry in the snmpTargetAddrTable does not exist, or the identified entry in the snmpTargetParamsTable does not exist, then this snmpProxyEntry does not identify valid forwarding information, and the proxy forwarder should attempt to identify another row.
If there is no entry in the snmpProxyTable for which all of the conditions above may be met, then there is no appropriate forwarding information, and the proxy forwarder should take appropriate actions.
Otherwise, The snmpTargetAddrTDomain, snmpTargetAddrTAddress,
snmpTargetAddrTimeout, and snmpTargetRetryCount of the identified
snmpTargetAddrEntry, and the snmpTargetParamsMPModel,
snmpTargetParamsSecurityModel, snmpTargetParamsSecurityName, and
snmpTargetParamsSecurityLevel of the identified snmpTargetParamsEntry
are used as the destination management target.
When forwarding notification messages, the proxy forwarder will select multiple entries in the snmpProxyTable. To select these entries, it will perform the following comparisons:
- The snmpProxyType must be trap(3) if the notification is a Trap. The snmpProxyType must be inform(4) if the request is an Inform. - The contextEngineId must equal the snmpProxyContextEngineID object. - If the snmpProxyContextName object is supported, it must equal the contextName. - The snmpProxyTargetParamsIn object identifies an entry in the snmpTargetParamsTable. The messageProcessingModel, securityLevel, security model, and securityName must match the values of snmpTargetParamsMPModel, snmpTargetParamsSecurityModel, snmpTargetParamsSecurityName, and snmpTargetParamsSecurityLevel of the identified entry in the snmpTargetParamsTable.
All entries for which these conditions are met are selected. The
snmpProxyMultipleTargetOut object of each such entry is used to
select a set of entries in the snmpTargetAddrTable. Any
snmpTargetAddrEntry whose snmpTargetAddrTagList object contains a tag
value equal to the value of snmpProxyMultipleTargetOut, and whose
snmpTargetAddrParams object references an existing entry in the
snmpTargetParamsTable, is selected as a destination for the forwarded
notification.
The IETF takes no position regarding the validity or scope of any intellectual property or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; neither does it represent that it has made any effort to identify any such rights. Information on the IETF's procedures with respect to rights in standards-track and standards-related documentation can be found in BCP-11. Copies of claims of rights made available for publication and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementors or users of this specification can be obtained from the IETF Secretariat.
The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights which may cover technology that may be required to practice this standard. Please address the information to the IETF Executive Director.
This document is the result of the efforts of the SNMPv3 Working Group. Some special thanks are in order to the following SNMPv3 WG members:
Dave Battle (SNMP Research, Inc.)
Uri Blumenthal (IBM T.J. Watson Research Center)
Jeff Case (SNMP Research, Inc.)
John Curran (BBN)
The document is based on recommendations of the IETF Security and Administrative Framework Evolution for SNMP Advisory Team. Members of that Advisory Team were:
David Harrington (Cabletron Systems Inc.)
Jeff Johnson (Cisco Systems)
David Levi (SNMP Research Inc.)
John Linn (Openvision)
Russ Mundy (Trusted Information Systems) chair
Shawn Routhier (Epilogue)
Glenn Waters (Nortel)
Bert Wijnen (IBM T. J. Watson Research Center)
As recommended by the Advisory Team and the SNMPv3 Working Group Charter, the design incorporates as much as practical from previous RFCs and drafts. As a result, special thanks are due to the authors of previous designs known as SNMPv2u and SNMPv2*:
Jeff Case (SNMP Research, Inc.)
David Harrington (Cabletron Systems Inc.)
David Levi (SNMP Research, Inc.)
Keith McCloghrie (Cisco Systems)
Brian O'Keefe (Hewlett Packard)
Marshall T. Rose (Dover Beach Consulting)
Jon Saperia (BGS Systems Inc.)
Steve Waldbusser (International Network Services)
Glenn W. Waters (Bell-Northern Research Ltd.)
The SNMP applications described in this document typically have direct access to MIB instrumentation. Thus, it is very important that these applications be strict in their application of access control as described in this document.
In addition, there may be some types of notification generator applications which, rather than accessing MIB instrumentation using access control, will obtain MIB information through other means (such as from a command line). The implementors and users of such applications must be responsible for not divulging MIB information that normally would be inaccessible due to access control.
[RFC1157]
Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple Network
Management Protocol", RFC 1157, May 1990.
[RFC1213]
McCloghrie, K. and M. Rose, Editors, "Management Information Base
for Network Management of TCP/IP-based internets: MIB-II", STD 17,
RFC 1213, March 1991.
[RFC1902]
Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Structure of
Management Information for Version 2 of the Simple Network
Management Protocol (SNMPv2)", RFC 1902, January 1996.
[RFC1903]
Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Textual
Conventions for Version 2 of the Simple Network Management Protocol
(SNMPv2)", RFC 1903, January 1996.
[RFC1905]
SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and S.
Waldbusser, "Protocol Operations for Version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC 1905, January 1996.
[RFC1907]
SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and S.
Waldbusser, "Management Information Base for Version 2 of the
Simple Network Management Protocol (SNMPv2)", RFC 1907, January
1996.
[RFC1908]
SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and S.
Waldbusser, "Coexistence between Version 1 and Version 2 of the
Internet-standard Network Management Framework", RFC 1908, January
1996.
[RFC2261]
Harrington, D., and B. Wijnen, "An Architecture for Describing SNMP
Management Frameworks", RFC 2261, January 1998.
[RFC2262]
Case, J., Harrington, D., and B. Wijnen, "Message Processing and
Dispatching for the Simple Network Management Protocol (SNMP)", RFC
2262, January 1998.
[RFC2265]
Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based Access
Control Model for the Simple Network Management Protocol (SNMP)",
RFC 2265, January 1998.
David B. Levi
SNMP Research, Inc.
3001 Kimberlin Heights Road
Knoxville, TN 37920-9716
U.S.A.
Phone: +1 423 573 1434
EMail: levi@snmp.com
Paul Meyer
Secure Computing Corporation
2675 Long Lake Road
Roseville, MN 55113
U.S.A.
Phone: +1 612 628 1592
EMail: paul_meyer@securecomputing.com
Bob Stewart
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
U.S.A.
Phone: +1 603 654 6923
EMail: bstewart@cisco.com
This section describes an example configuration for a Notification Generator application which implements the snmpNotifyBasicCompliance level. The example configuration specifies that the Notification Generator should send notifications to 3 separate managers, using authentication and no privacy for the first 2 managers, and using both authentication and privacy for the third manager.
The configuration consists of three rows in the snmpTargetAddrTable, and two rows in the snmpTargetTable.
snmpTargetAddrName SnmpAdminString, snmpTargetAddrTDomain TDomain, snmpTargetAddrTAddress TAddress, snmpTargetAddrTimeout TimeInterval, snmpTargetAddrRetryCount Integer32, snmpTargetAddrTagList SnmpAdminString, snmpTargetAddrParams SnmpAdminString, snmpTargetAddrStorageType StorageType, snmpTargetAddrRowStatus RowStatus * snmpTargetAddrName = "addr1" snmpTargetAddrTDomain = snmpUDPDomain snmpTargetAddrTAddress = 128.1.2.3:162 snmpTargetAddrTagList = "group1" snmpTargetAddrParams = "AuthNoPriv joe" snmpTargetAddrStorageType = readOnly(5) snmpTargetAddrRowStatus = active(1) * snmpTargetAddrName = "addr2" snmpTargetAddrTDomain = snmpUDPDomain snmpTargetAddrTAddress = 128.2.4.6:162 snmpTargetAddrTagList = "group1" snmpTargetAddrParams = "AuthNoPriv-joe" snmpTargetAddrStorageType = readOnly(5) snmpTargetAddrRowStatus = active(1) * snmpTargetAddrName = "addr3" snmpTargetAddrTDomain = snmpUDPDomain snmpTargetAddrTAddress = 128.1.2.3:162 snmpTargetAddrTagList = "group2" snmpTargetAddrParams = "AuthPriv-bob" snmpTargetAddrStorageType = readOnly(5) snmpTargetAddrRowStatus = active(1) * snmpTargetParamsName = "AuthNoPriv-joe" snmpTargetParamsMPModel = 3
snmpTargetParamsSecurityModel = 3 (USM) snmpTargetParamsSecurityName = "joe" snmpTargetParamsSecurityLevel = authNoPriv(2) snmpTargetParamsStorageType = readOnly(5) snmpTargetParamsRowStatus = active(1) * snmpTargetParamsName = "AuthPriv-bob" snmpTargetParamsMPModel = 3 snmpTargetParamsSecurityModel = 3 (USM) snmpTargetParamsSecurityName = "bob" snmpTargetParamsSecurityLevel = authPriv(3) snmpTargetParamsStorageType = readOnly(5) snmpTargetParamsRowStatus = active(1) * snmpNotifyName = "group1" snmpNotifyTag = "group1" snmpNotifyType = trap(1) snmpNotifyStorageType = readOnly(5) snmpNotifyRowStatus = active(1) * snmpNotifyName = "group2" snmpNotifyTag = "group2" snmpNotifyType = trap(1) snmpNotifyStorageType = readOnly(5) snmpNotifyRowStatus = active(1)
These entries define two groups of management targets. The first group contains two management targets:
first target second target ------------ ------------- messageProcessingModel SNMPv3 SNMPv3 securityModel 3 (USM) 3 (USM) securityName "joe" "joe" securityLevel authNoPriv(2) authNoPriv(2) transportDomain snmpUDPDomain snmpUDPDomain transportAddress 128.1.2.3:162 128.2.4.6:162
And the second group contains a single management target:
messageProcessingModel SNMPv3 securityLevel authPriv(3) securityModel 3 (USM) securityName "bob" transportDomain snmpUDPDomain transportAddress 128.1.5.9:162
This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English.
The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.