IP Switching Cisco Express Forwarding Configuration Guide, Cisco IOS Release 15M&T
SNMP CEF-MIB Support
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SNMP CEF-MIB Support

Contents

SNMP CEF-MIB Support

The Cisco Express Forwarding--SNMP CEF-MIB Support feature introduces the CISCO-CEF-MIB, which allows management applications through the use of the Simple Network Management Protocol (SNMP) to configure and monitor Cisco Express Forwarding operational data and to provide notification when Cisco Express Forwarding encounters specific configured events. This module describes how to use the CISCO-CEF-MIB to manage and monitor objects related to Cisco Express Forwarding operation.

Cisco Express Forwarding is an advanced Layer 3 IP switching technology. It optimizes network performance and scalability for all kinds of networks: those that carry small amounts of traffic and those that carry large amounts of traffic in complex patterns, such as the Internet and networks characterized by intensive web-based applications or interactive sessions.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Prerequisites for SNMP CEF-MIB Support

  • Cisco Express Forwarding or distributed Cisco Express Forwarding must be configured on your system.
  • The Cisco Express Forwarding infrastructure introduced in Cisco IOS Release12.2(25)S must be included in the image on your system.
  • The router on which the Cisco Express Forwarding--SNMP CEF-MIB Support features is to be used must be configured for SNMP access. See the Configuring the Router to Use SNMP of this document for more information.

Information About SNMP CEF-MIB Support

CEF Functional Overview

Cisco Express Forwarding is an advanced Layer 3 IP switching technology. It uses a Forwarding Information Base (FIB) to make IP destination prefix-based switching decisions. The FIB is conceptually similar to a routing table or information base. It maintains the forwarding information contained in the IP routing table. When routing or topology changes occur in the network, the IP routing table is updated, and those changes are propagated to the FIB. The FIB maintains next-hop address information based on the information in the IP routing table. The two main components of Cisco Express Forwarding operation are the FIB and adjacency tables.

Cisco Express Forwarding uses adjacency tables to prepend Layer 2 addressing information. An adjacency table maintains Layer 2 next-hop addresses for all FIB entries. Nodes in the network are said to be adjacent if they can reach each other with a single hop across a link layer. Cisco Express Forwarding discovers and solves adjacencies and populates the adjacency tables.


Note


The CISCO-CEF-MIB prefix database and its related database can be very large. Therefore, executing a command that displays the prefix table could take a considerable amount of time.


Benefits of CISCO-CEF-MIB

Command-line interface (CLI) show commands are available to obtain Cisco Express Forwarding operational information. Managing Cisco Express Forwarding using the CLI can be a time-consuming task. The increasing capacity of Cisco routers makes parsing the show commands output to obtain the needed Cisco Express Forwarding operational parameters more and more difficult.

In Cisco IOS Release 12.2(31)SB and later releases, the CISCO-CEF-MIB allows you to manage and monitor the Cisco Express Forwarding operation using SNMP. In addition, you can configure SNMP to notify you if Cisco Express Forwarding encounters errors.

The CISCO-CEF-MIB introduced with the Cisco Express Forwarding--SNMP CEF-MIB Support feature gives you real-time access to operational information stored in the FIB and adjacency tables, switching statistics, and information on resource failures. The feature enables you to configure parameters related to Cisco Express Forwarding features by utilizing a MIB implementation based on SNMP. This information is accessed using get and set commands entered on the network management system (NMS) workstation or host system for which SNMP has been implemented. The NMS workstation is also known as the SNMP manager.

Cisco Express Forwarding is available in all Cisco routers. However, CISCO-CEF-MIB support of Cisco Express Forwarding management is dependent on the infrastructure introduced in Cisco IOS Release 12.2(22)S.

The implementation of the CISCO-CEF-MIB in Cisco IOS Release 12.2(31)SB2, Cisco IOS Release 12.2(33)SRC,and Cisco IOS Release 12.2(33)SB manages Cisco Express Forwarding instances running on the Route Processor (RP). Information about Cisco Express Forwarding running on the line cards is available to the RP in reference to Cisco Express Forwarding peers only.

The CISCO-CEF-MIB supports configuration and monitoring for both IP versions, IP Version 4 (IPv4) and IP Version 6 (IPv6).

Information Managed by the CISCO-CEF-MIB

SNMP has historically been used to collect network information. SNMP permits retrieval of critical information from network elements such as routers, switches, and workstations.

The CISCO-CEF-MIB provides managed objects that enable a network administrator to monitor the following:

  • Cisco Express Forwarding administrative and operational states as displayed in the output of the show ip cef summary command
  • Notifications for Cisco Express Forwarding events: Cisco Express Forwarding state changes, Cisco Express Forwarding failures (with a predefined reason), and Route Processor (RP) and line card inconsistencies
  • Parameters related to Cisco Express Forwarding for the associated interface as displayed by the show cef interface command
  • Line card Cisco Express Forwarding states and line card Cisco Express Forwarding FIB states in the Linecard table as displayed by the show cef linecardcommand
  • Cisco Express Forwarding statistics: switching statistics, punt counters and punt-to-host counters as displayed by the show ip cef switching statscommand, and per-prefix counters and nonrecursive counters
  • IPv4 and IPv6 notification, when Cisco Express Forwarding is switched between disable and enable and between Cisco Express Forwarding and distributed Cisco Express Forwarding

The SNMP CISCO-CEF-MIB provides managed objects that enable a network administrator to configure the following:

  • Cisco Express Forwarding and distributed Cisco Express Forwarding administration status
  • Cisco Express Forwarding accounting-related parameters
  • Cisco Express Forwarding load sharing-related parameters
  • Traffic-related configuration parameters

CISCO-CEF-MIB Object Groups

The SNMP CISCO-CEF-MIB allows the configuration and management of objects related to Cisco Express Forwarding. The MIB contains the following object groups:

  • CEF FIB group
  • CEF Adjacency group
  • CEF Forwarding Element group
  • CEF Cfg group
  • CEF Interface group
  • CEF Peer group
  • CEF Consistency (CC) group
  • CEF State Group
  • CEF Notification Control group

In the CISCO-CEF-MIB, configuration objects are defined as read-write, and the other objects are defined as read only.

The CISCO-CEF-MIB contains tables related to the Cisco Express Forwarding object groups. These tables provide information about prefixes, forwarding paths, adjacencies, output chain elements (OCEs), prefix-based statistics, information about Cisco Express Forwarding configuration, consistency checkers, switching statistics, and managed objects specific to line card-specific.

The CISCO-CEF-MIB also defines Cisco Express Forwarding notifications that you can enable or disable through the MIB or CLI commands.

The index for most tables in the CISCO-CEF-MIB is entPhysicalIndex.

CISCO-CEF-MIB Tables

  • The CEF FIB Summary table (cefFIBSummaryTable) contains the number of forwarding prefixes for both IPv4 and IPv6 protocols. It is a summary of the CEF Forwarding table.
  • The CEF Forwarding table (cefPrefixTable) lists all the prefixes and related counters. It also contains a pointer to the CEF Forwarding Element Selection table.
  • The CEF Longest Match Prefix table (cefLMPrefixTable) returns the longest prefix match for the given destination address. An optional cefLMPrefixSpinLock object is provided to reduce conflict in instances when more than one application acts on the CEF Longest Match Prefix table.
  • The CEF Path table (cefPathTable) lists all the Cisco Express Forwarding paths.
  • The CEF Adjacency Summary table (cefAdJSummaryTable) contains the total number of complete, incomplete, fixup, and redirect adjacencies for all link types.
  • The CEF Adjacency table (cefAdjTable) lists all the adjacencies. It contains the adjacency source, encapsulation string, fixup, and Layer 3 maximum transmission unit (MTU) associated with the adjacency entry. It contains a pointer to the forwarding element selection table (if the adjacency is a MID chain adjacency).
  • The CEF Forwarding Element Selection table (cefFESelectionTable) represents the OCE chains in flattened format. This table shows only the labels, table ID, and adjacency traversed in the OCE chain. It also contains the weight associated with each OCE chain.
  • CEF Cfg table (cefCfgTable) contains all the global configuration parameters related to Cisco Express Forwarding: administration and operational status, accounting-related configuration parameters, load-sharing algorithms and IDs, and traffic statistics parameters.
  • CEF Resource table (cefResourceTable) contains information about resources for Cisco Express Forwarding: the memory status of the process memory pool and reasons for the Cisco Express Forwarding resource failure notifications.
  • CEF Interface table (cefIntTable) contains the interface-specific Cisco Express Forwarding parameters: interface switching state, interface load sharing (per packet and per destination), and interface nonrecursive routing (internal and external).
  • CEF Peer table or Linecard table (cefPeerTable) contains Cisco Express Forwarding information related to peers on a managed line card: line card operational state and the number of times the line card session resets.
  • CEF Peer FIB table (cefPeerFIBTable) contains information about the operational state of the Forwarding Information Bases (FIBs) on each line card.
  • The CEF Prefix Length Statistics table (cefStatsPrefixTable) maintains prefix length-based statistics.
  • CEF Switching Statistics table (cefSwitchingStatsTable) contains the switching statistics for each switching path: drop counters, punt counters, and punt-to-host counters.
  • CEF IP Prefix Consistency Checker Global group (cefCCGlobalTable) contains all global configuration parameters for the consistency checkers: auto repair, enable and disable, delay, and hold down; enable or disable the passive consistency checkers; enable or disable the error messages for consistency detection; and the mechanism to activate the full scan consistency checkers. This table also displays the state of full scan consistency checkers.
  • CEF Consistency Checker Type table (cefCCTypeTable) contains the consistency checker type specific parameters: frequency and count of scan for passive scanners and the queries sent, ignored, checked, and iterated.
  • CEF Inconsistency Record table (cefInconsistencyRecordTable) contains the detected inconsistency records: prefix address and length, table ID, consistency checker type, slot ID, and the reason for the inconsistency (missing or checksum error).

See theOperations Available Through the CISCO-CEF-MIB for information about the specific objects available through the CISCO-CEF-MIB tables.

The figure below shows the contents of the CISCO-CEF-MIB main tables and the relationships of the tables to one another.

Figure 1. CISCO-CEF-MIB Main Tables, Table Contents, and Relationships

Operations Available Through the CISCO-CEF-MIB

You can use SNMP getand setcommands to configure and monitor Cisco Express Forwarding operations that are available through the CISCO-CEF-MIB tables. This section describes the configuration and monitoring operations for each table.

The table below lists the Cisco Express Forwarding monitoring operations and associated MIB objects provided by the CEF FIB Summary table (cefFIBSummaryTable).

Table 1 CEF FIB Summary Table--Cisco Express Forwarding Operation and Associated MIB Object

Cisco Express Forwarding Operation

Description

Gets the number of forwarding prefixes for IPv4 and IPv6

cefFIBSummaryFwdPrefixes

The table below lists the Cisco Express Forwarding monitoring operations and associated MIB objects provided by the CEF Forwarding table (cefPrefixTable).

Table 2 CEF Forwarding Table--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Object

Gets the forwarding information for the entry

cefPrefixForwardingInfo

Gets the number of packets forwarded by the prefix

cefPrefixPkts

Gets the number of packets forwarded by the prefix in a 64-bit value

cefPrefixHCPkts

Gets the number of bytes forwarded by the prefix

cefPrefixBytes

Gets the number of bytes forwarded by the prefix in a 64-bit value

cefPrefixHCBytes

Gets the number of internal nonrecursive packets forwarded by the prefix

cefPrefixInternalNRPkts

Gets the number of internal nonrecursive packets forwarded by the prefix in a 64-bit value

cefPrefixInternalNRHCPkts

Gets the number of internal nonrecursive bytes forwarded by the prefix

cefPrefixInternalNRBytes

Gets the number of internal nonrecursive bytes forwarded by the prefix in a 64-bit value

cefPrefixInternalNRHCBytes

Gets the number of external nonrecursive packets forwarded by the prefix

cefPrefixExternalNRPkts

Gets the number of external nonrecursive packets forwarded by the prefix in a 64-bit value

cefPrefixExternalNRHCPkts

Gets the number of external nonrecursive bytes forwarded by the prefix

cefPrefixExternalNRBytes

Gets the number of external nonrecursive bytes forwarded by the prefix in 64-bit value

cefPrefixExternalNRHCBytes

The table below lists the Cisco Express Forwarding monitoring operations and associated MIB objects provided by the CEF Longest Match Prefix table (cefLMPrefixTable).

Table 3 CEF Longest Match Prefix Table--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Object

Gets or sets the lock for creation or modification of the longest match prefix entries

cefLMPrefixSpinLock

Gets the state of the destination prefix request

cefLMPrefixState

Gets the network prefix address for the destination prefix request

cefLMPrefixAddr

Gets the network prefix length for the destination prefix request (the same display as the show ip cef exact-route command)

cefLMPrefixLen

Gets the status of a table entry

cefLMPrefixRowStatus

The table below lists the Cisco Express Forwarding monitoring operations and associated MIB objects provided by the CEF Path table (cefPathTable).

Table 4 CEF Path Table--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Object

Gets the type of Cisco Express Forwarding path for a prefix

cefPathType

Gets the interface associated with this Cisco Express Forwarding path

cefPathInterface

Gets the next-hop address for the Cisco Express Forwarding path

cefPathNextHopAddr

Gets the recursive Virtual Private Network (VPN) routing and forwarding (VRF) instance name associated with this path

cefPathRecurseVrfName

The table below lists the Cisco Express Forwarding monitoring operations and associated MIB objects provided by the CEF Adjacency Summary table (cefAdjSummaryTable).

Table 5 CEF Adjacency Summary Table--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Objects

Gets the number of complete adjacencies

cefAdjSummaryComplete

Gets the number of incomplete adjacencies

cefAdjSummaryInComplete

Gets the number of adjacencies for Layer 2 encapsulation

cefAdjSummaryFixup

Gets the number of adjacencies for IP redirect

cefAdjSummaryRedirect

The table below lists the Cisco Express Forwarding monitoring operations and associated MIB objects provided by the CEF Adjacency table (cefAdjTable).

Table 6 CEF Adjacency Table--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Object

Gets the adjacency source

cefAdjSource

Gets the adjacency Layer 2 encapsulation

cefAdjEncap

Gets the adjacency fixup

cefAdjFixup

Gets the Layer 3 maximum transmission unit (MTU) for the adjacency

cefAdjMTU

Gets the forwarding information in cefFESelectionTable

cefAdjForwardingInfo

Gets the number of packets transmitted

cefAdjPkts

Gets the number of packets transmitted in a 64-bit version

cefAdjHCPkts

Gets the number of bytes transmitted

cefAdjBytes

Gets the number of bytes transmitted in a 64-bit version

cefAdjHCBytes

The table below lists the Cisco Express Forwarding monitoring operations and associated MIB objects provided by the CEF Forwarding Element Selection table (cefFESelectionTable).

Table 7 CEF Forwarding Element Selection Table--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Object

Gets any special processing for a forwarding element

cefFESelectionSpecial

Gets the Multiprotocol Label Switching (MPLS) labels for a forwarding element

cefFESelectionLabels

Gets the adjancency type for a forwarding element

cefFESelectionAdjLinkType

Gets the interface for the adjacency for a forwarding element

cefFESelectionAdjInterface

Gets the next-hop address type for the adjacency for a forwarding element

cefFESelectionAdjNextHopAddrType

Gets the next-hop address for the adjacency for a forwarding element

cefFESelectionAdjNextHopAddr

Gets the connection ID for the adjacency for a forwarding element

cefFESelectionAdjConnId

Gets the VRF name for the lookup for a forwarding element

cefFESelectionVrfName

Gets the weighting for load balancing for a forwarding element

cefFESelectionWeight

The table below lists the Cisco Express Forwarding configuration and monitoring operations and associated MIB objects provided by the CEF Cfg table (cefCfgTable).

Table 8 CEF Cfg Table--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Objects

Enables or disables a Cisco Express Forwarding instance

cefCfgAdminState

Queries a Cisco Express Forwarding operational instance

cefCfgOperState

Enables or disables a distributed Cisco Express Forwarding instance

cefCfgDistributionAdminState

Queries a distributed Cisco Express Forwarding operational instance

cefCfgDistributionOperState

Gets or sets Cisco Express Forwarding network accounting options

cefCfgAccountingMap

  • nonRecursive (0)
  • perPrefix (1)
  • prefixLength (2)

Gets or sets Cisco Express Forwarding load sharing algorithm options

cefCfgLoadSharingAlgorithm

  • none (1) - Load sharing is disabled.
  • original (2)
  • tunnel (3)
  • universal (4)

Gets or sets a load sharing ID

cefCfgLoadSharingID

Gets or sets a traffic interval timer for Cisco Express Forwarding traffic statistics

cefCfgTrafficStatsLoadInterval

Gets or sets a frequency timer for the line card to send traffic statistics to the RP

cefCfgTrafficStatsUpdateRate

The table below lists the Cisco Express Forwarding monitoring operations and associated MIB objects provided by the CEF Resource table (cefResourceTable).

Table 9 CEF Resource Table--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Object

Gets the memory status of process memory pool for Cisco Express Forwarding

cefResourceMemoryUsed

Gets the reason for the Cisco Express Forwarding resource failure notification

cefResourceFailureReason

The table below lists the Cisco Express Forwarding configuration and monitoring operations and associated MIB objects provided by the CEF Interface table (cefIntTable).

Table 10 CEF Interface Table--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Objects

Gets or sets the Cisco Express Forwarding switching state of the interface

cefIntSwitchingState

  • cefEnabled (1)
  • distCefEnabled (2)
  • cefDisabled (3)

Gets or sets the type of Cisco Express Forwarding Load sharing on the interface

cefIntLoadSharing

  • perPacket (1)
  • perDestination (2)

Gets or sets Cisco Express Forwarding nonrecursive accounting on the interface

cefIntNonrecursiveAccouting

  • internal (1)
  • external (2)

The table below lists the Cisco Express Forwarding monitoring operations and associated MIB objects provided by the CEF Peer table (or Linecard table) (cefPeerTable).

Table 11 CEF Peer Table--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Objects

Gets the Cisco Express Forwarding operational instance of the peer entity

cefPeerOperState

Gets how many times the session with the Peer resets

cefPeerNumberOfResets

The table below lists the Cisco Express Forwarding monitoring operation and associated MIB object provided by the CEF Peer FIB table (cefPeerFIBTable).

Table 12 CEF Peer FIB Table--Cisco Express Forwarding Operation and Associated MIB Object

Cisco Express Forwarding Operation

MIB Objects

Gets the current Cisco Express Forwarding FIB operation state of the peer entity

cefPeerFIBOperState

The table below lists the Cisco Express Forwarding monitoring operations and associated MIB objects provided by the CEF Prefix Length Statistics table (cefStatsPrefixTable).

Table 13 CEF Prefix Length Statistics Table--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Object

Gets the number of queries (lookups) in the FIB database for a prefix length

cefStatsPrefixQueries

Gets the number of queries (lookups) in the FIB database for a prefix length in a 64-bit value

cefStatsPrefixHCQueries

Gets the number of inserts in the FIB database for a prefix length

cefStatsPrefixInserts

Gets the number of inserts in the FIB database for a prefix length in a 64-bit value

cefStatsPrefixHCInsert

Gets the number of deletes in the FIB database for a prefix length

cefStatsPrefixDeletes

Gets the number of deletes in the FIB database for a prefix length in a 64-bit version

cefStatsPrefixHCDeletes

Gets the number of elements in the FIB database for a prefix length

cefStatsPrefixElements

Gets the number of elements in the FIB database for a prefix length in a 64-bit value

cefStatsPrefixHCElements

The table below lists the Cisco Express Forwarding monitoring operations and associated MIB objects provided by the CEF Switching Statistics table (cefSwitchingStatsTable).

Table 14 CEF Switching Statistics Table--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Objects

Gets the switching path of a Cisco Express Forwarding instance

cefSwitchingPath

Gets the number of packets dropped by a Cisco Express Forwarding instance

cefSwitchingDrop

Gets the number of packets dropped by a Cisco Express Forwarding instance in a 64-bit value

cefSwitchingHCDrop

Gets the number of packets that could be punted

cefSwitchingPunt

Gets the number of packets that could be punted in a 64-bit value

cefSwitchingHCPunt

Gets the number of packets that are punted to the host

cefSwitchingPunt2Host

Gets the number of packets that are punted to the host in a 64-bit value

cefSwitchingHCPunt2Host

The table below lists the Cisco Express Forwarding configuration and monitoring operations and associated MIB objects provided by the CEF IP Prefix Consistency Global Checker group (cefCCGlobalTable).

Table 15 CEF IP Prefix Consistency Global Checker Group--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Objects

Enables or disables auto repairing of the consistency checkers

cefCCGlobalAutoRepairEnabled

Gets or sets the consistency checker wait time before fixing the inconsistency

cefCCGlobalAutoRepairDelay

Gets or sets the consistency checker wait time to reenable auto repair after auto repair runs

cefCCGlobalAutoRepairHoldDown

Enables or disables error message generation for an inconsistency

cefCCGlobalErrorMsgEnabled

The table below lists the Cisco Express Forwarding configuration and monitoring operations and associated MIB objects provided by the CEF Consistency Checker Type table (cefCCTypeTable).

Table 16 CEF Consistency Checker Type Table--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Objects

Enables or disables the passive consistency checker

cefCCEnabled

Gets or sets the maximum number of prefixes per scan

cefCCCount

Gets or sets the period between scans for the consistency checker

cefCCPeriod

Gets the number of prefix consistency queries sent to the Cisco Express Forwarding FIB

cefCCQueriesSent

Gets the number of prefix consistency queries ignored by the consistent checker

cefCCQueriesIgnored

Gets the number of prefix consistent queries iterated back to the database

cefCCQueriesIterated

Gets the number of prefix consistent queries processed

cefCCQueriesChecked

The table below lists the Cisco Express Forwarding configuration and monitoring operations and associated MIB objects provided by the CEF Inconsistency Record table (cefInconsistencyRecordTable).

Table 17 CEF Inconsistency Record Table--Cisco Express Forwarding Operations and Associated MIB Objects

Cisco Express Forwarding Operation

MIB Objects

Gets the network prefix type for the inconsistency

cefInconsistencyPrefixType

Gets the network prefix address for the inconsistency

cefInconsistencyPrefixAddr

Gets the network prefix length for the inconsistency

cefInconsistencyPrefixLen

Gets the VRF name for the inconsistency

cefInconsistencyVrfName

Gets the consistency checker type that found the inconsistency

cefInconsistencyCCType

Gets the entity in which this inconsistency occurred

cefInconsistencyEntity

Gets the reason for generating the inconsistency

cefInconsistencyReason

  • missing (1)
  • checksumErr (2)
  • unknown (3)

Global Objects for Cisco Express Forwarding Inconsistency

Gets the value of the system uptime at the time an inconsistency was detected

entLastInconsistencyDetectTime

Sets an object to restart all active consistency checkers

cefInconsistencyReset

Gets the status of the inconsistency reset request

cefInconsistencyResetStatus

CISCO-CEF-MIB Notifications

The table below lists the Cisco Express Forwarding operations associated with the CISCO-CEF-MIB objects that enable the sending of Cisco Express Forwarding notifications.

Table 18 Cisco Express Forwarding Notifications--Cisco Express Forwarding Operations and CISCO-CEF-MIB Objects That Enable Them

Cisco Express Forwarding Operation

MIB Object

Enables the sending of a notification on the detection of a Cisco Express Forwarding resource failure

cefResourceFailureNotifEnable

Enables the sending of a notification on the detection of a Cisco Express Forwarding peer state change

cefPeerStateChangeNotifEnable

Enables the sending of a notification on the detection of a Cisco Express Forwarding FIB peer state change

cefPeerFIBStateChangeNotifEnable

Sets the period of time after the sending of each notification event

cefNotifThrottlingInterval

Enables the sending of a notification on the detection of an inconsistency

cefInconcsistencyNotifEnable

You can enable or disable these notifications through the MIB or by entering a CLI command. The table below contains a description of the notifications and the commands you use to enable each notification.


Note


You must enter a snmp-server host command before you enter a command to enable or disable a CISCO-CEF-MIB notification.


Table 19 Description of Notifications and Enabling Commands for the CEF-PROVISION-MIB Notifications

Notification

Generated for

Commands

Cisco Express Forwarding resource failure notification

A malloc failure, an Inter-Process Communication (IPC) failure, and any other type of failure related to External Data Representation (XDR) messages

CLI: snmp-server enable traps cef resource-failure

MIB: setany version ip-address community-string cefResourceFailureNotifEnable.0 -i 1

Cisco Express Forwarding peer state change notification

A change in the operational state of a peer on the line cards

CLI: snmp-server enable traps cef peer-state-change

MIB: setany version ip-address community-string cefPeerStateChangeNotifEnable.0 -i 1

Cisco Express Forwarding peer FIB state change notification

A change in the operational state of the peer FIB

CLI: snmp-server enable traps cef peer-fib-state-change

MIB: setany version ip-address community-string cefPeerFIBStateChangeNotifEnable.0 -i 1

Cisco Express Forwarding inconsistency detection notification

An inconsistency detected by the consistency checkers

CLI: snmp-server enable traps cef inconsistency

MIB: setany version ip-address community-string cefInconsistencyNotifEnable.0 -i 1

How to Configure SNMP CEF-MIB Support

Configuring the Router to Use SNMP

Perform the following task to configure a router to use SNMP.

Before you can use the Cisco Express Forwarding--SNMP CEF-MIB Support feature, you must configure the SNMP server for the router.

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    snmp-server community string [view view-name] [ro | rw] [ipv6 nacl] [access-list-number]

    4.    snmp-server community string2 rw

    5.    end


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Router> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.
     
    Step 2 configure terminal


    Example:
    Router# configure terminal
     

    Enters global configuration mode.

     
    Step 3 snmp-server community string [view view-name] [ro | rw] [ipv6 nacl] [access-list-number]


    Example:
    Router(config)# snmp-server community public ro
    
     

    Sets up the community access string to permit access to SNMP.

    • The string argument is a community string that consists of from 1 to 32 alphanumeric characters and functions much like a password, permitting access to the SNMP protocol. Blank spaces are not permitted in the community string.
    • The view view-name keyword-argument pair is the name of a previously defined view. The view defines the objects available to the SNMP community.
    • The ro keyword specifies read-only access. Authorized management stations can only retrieve MIB objects.
    • The rw keyword specifies read-write access. Authorized management stations can retrieve and modify MIB objects.
    • The ipv6 naclkeywords specify the IPv6 named access list.
    • The access-list-number argument is an integer from 1 to 99. It specifies a standard access list of IP addresses or a string (not to exceed 64 characters) that is the name of a standard access list of IP addresses that are allowed access to the SNMP agent.

    Alternatively, an integer from 1300 to 1999 that specifies a list of IP addresses in the expanded range of standard access list numbers. Devices at these addresses are allowed to use the community string to gain access to the SNMP agent.

    Note   

    The stringargument (Step 3) and string2argument (Step 4) provide a minimal level of security. It is advisable to provide the string for read-only access to others who need only to view and not to modify the MIB objects, and reserve the read-write access string for administrators only. The string2 argument (Step 4) should be different from the read-only string argument specified in this step.

     
    Step 4 snmp-server community string2 rw


    Example:
    Router(config)# snmp-server community private rw
    
     

    Sets up the community access string to permit access to SNMP.

    • The string2 argument is a community string that consists of from 1 to 32 alphanumeric characters and functions much like a password, permitting access to the SNMP protocol. Blank spaces are not permitted in the community string.
    • The rw keyword specifies read-write access. Authorized management stations can retrieve and modify MIB objects.

    This example allows MIB objects to be retrieved and set because a string is specified with read-write access.

    Note   

    The stringargument (Step 3) and string2argument (Step 4) provide a minimal level of security. It is advisable to provide the string for read-only access to others who need only to view and not to modify the MIB objects, and reserve the read-write access string for administrators only. The string2 argument (Step 4) should be different from the read-only string argument specified in the preceding step (Step 3).

     
    Step 5 end


    Example:
    Router(config)# end
     

    Exits to privileged EXEC mode.

     

    Configuring a Host to Receive Notifications

    Perform the following task to configure an SNMP host to receive CISCO-CEF-MIB notifications. Notifications provide information to assist you in the monitoring and managing of Cisco Express Forwarding operations.

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    snmp-server community string [ro | rw]

      4.    snmp-server community string2 rw

      5.    snmp-server host ip-address [vrf vrf-name] [traps | informs] [version {1| 2c | 3 [auth | noauth | priv]}] community-string [udp-port port] cef

      6.    end


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 enable


      Example:
      Router> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.
       
      Step 2 configure terminal


      Example:
      Router# configure terminal
       

      Enters global configuration mode.

       
      Step 3 snmp-server community string [ro | rw]


      Example:
      Router(config)# snmp-server community public ro
      
       

      Sets up the community access string to permit access to SNMP.

      • The string argument is a community string that consists of from 1 to 32 alphanumeric characters and functions much like a password, permitting access to the SNMP protocol. Blank spaces are not permitted in the community string.
      • The ro keyword specifies read-only access. Authorized management stations can only retrieve MIB objects.
      • The rw keyword specifies read-write access. Authorized management stations can retrieve and modify MIB objects.
       
      Step 4 snmp-server community string2 rw


      Example:
      Router(config)# snmp-server community private rw
      
       

      Sets up the community access string to permit access to SNMP.

      • The string2 argument is a community string that consists of from 1 to 32 alphanumeric characters and functions much like a password, permitting access to the SNMP protocol. Blank spaces are not permitted in the community string.
      • The rw keyword specifies read-write access. Authorized management stations can retrieve and modify MIB objects.

      This example allows MIB objects to be retrieved and set because a string is specified with read-write access.

      Note   

      The stringargument (Step 3) and string2argument (Step 4) provide a minimal level of security. It is advisable to provide the string for read-only access to others who need only to view and not to modify the MIB objects, and retain the read-write access string for administrators only. The string2 argument (Step 4) should be different from the read-only string argument specified in the preceding step (Step 3).

       
      Step 5 snmp-server host ip-address [vrf vrf-name] [traps | informs] [version {1| 2c | 3 [auth | noauth | priv]}] community-string [udp-port port] cef


      Example:
      Router(config)# snmp-server host 10.56.125.47 informs version 2c public cef
       

      Specifies the recipient of an SNMP notification operation.

      • The ip-address argument is the IP address or IPv6 address of the SNMP notification host.

      The SNMP notification host is typically a network management station (NMS or SNMP manager). This host is the recipient of the SNMP traps or informs.

      • The vrf vrf-name keyword and argument specify that the specified VRF be used to send SNMP notifications.
      • The traps keyword specifies that notifications should be sent as traps. This is the default.
      • The informs keyword specifies that notifications should be sent as informs.
      • The version keyword specifies the version of the SNMP used to send the traps. The default is 1.

      If you use the version keyword, one of the following keywords must be specified:

        • 1 --SNMPv1. This option is not available with informs.
        • 2c --SNMPv2c.
        • 3 --SNMPv3. The most secure model because it allows packet encryption with the priv keyword. The default is noauth.
      • One of the following three optional security level keywords can follow the version 3 keywords:
        • auth--Enables Message Digest 5 (MD5) and Secure Hash Algorithm (SHA) packet authentication.
        • noauth--Specifies that the noAuthNoPriv security level applies to this host. This is the default security level for SNMPv3.
        • priv--Enables Data Encryption Standard (DES) packet encryption (also called "privacy").
      • The community-string argument specifies that a password-like community string be sent with the notification operation.
      • The udp-port port keyword and argument specify that SNMP notifications or informs are to be sent to the User Datagram Protocol (UDP) port number of the NMS host. The default is 162.
      • The cef keyword specifies that the Cisco Express Forwarding notification type is to be sent to the host. If no type is specified, all available notifications are sent.
       
      Step 6 end


      Example:
      Router(config)# end
       

      Exits to privileged EXEC mode.

       

      Configuring SNMP Notifications with the CLI

      Perform the following task to configure SNMP notifications for Cisco Express Forwarding events. To configure this feature using SNMP commands instead of the CLI, see the Configuring SNMP Notifications with SNMP Commands.

      Before You Begin

      You must have configured an NMS or SNMP agent to receive the SNMPCISCO-CEF-MIB notification. See the Configuring a Host to Receive Notifications.

      SUMMARY STEPS

        1.    enable

        2.    configure terminal

        3.    snmp-server enable traps cef [peer-state-change] [resource-failure] [inconsistency] [peer-fib-state-change]

        4.    snmp-server host ip-address [traps | informs] [version {1| 2c | 3 [auth | noauth | priv]}] community-string cef

        5.    end


      DETAILED STEPS
         Command or ActionPurpose
        Step 1 enable


        Example:
        Router> enable
         

        Enables privileged EXEC mode.

        • Enter your password if prompted.
         
        Step 2 configure terminal


        Example:
        Router# configure terminal
         

        Enters global configuration mode.

         
        Step 3 snmp-server enable traps cef [peer-state-change] [resource-failure] [inconsistency] [peer-fib-state-change]


        Example:
        Router(config)# snmp-server enable traps cef resource-failure
         

        Enables Cisco Express Forwarding support of SNMP notifications on an NMS.

        • The peer-state change keyword enables the sending of CISCO-CEF-MIB SNMP notifications for changes in the operational state of Cisco Express Forwarding peers.
        • The resource-failure keyword enables the sending of CISCO-CEF-MIB SNMP notifications for resource failures that affect Cisco Express Forwarding operations.
        • The inconsistencykeyword enables the sending of CISCO-CEF-MIB SNMP notifications for inconsistencies that occur when routing information is updated from the Routing Information Base (RIB) to the CISCO-CEF-MIB on the RP and to the CISCO-CEF-MIB on the line cards.

        You can set the throttling interval for sending inconsistency notifications. See the Configuring the Throttling Interval with the CLI.

        • The peer-fib-state-change keyword enables the sending of CISCO-CEF-MIB SNMP notifications for changes in the operational state of the Cisco Express Forwarding peer FIB.
         
        Step 4 snmp-server host ip-address [traps | informs] [version {1| 2c | 3 [auth | noauth | priv]}] community-string cef


        Example:
        Router(config)# snmp-server host 10.56.125.47 informs version 2c public cef
         

        Specifies the recipient of an SNMP notification operation.

        • The ip-address argument is the IP address or IPv6 address of the SNMP notification host.

        The SNMP notification host is typically a network management station (NMS or SNMP manager). This host is the recipient of the SNMP traps or informs.

        • The traps keyword specifies that notifications should be sent as traps. This is the default.
        • The informs keyword specifies that notifications should be sent as informs.
        • The version keyword specifies the version of the SNMP used to send the traps or informs. The default is 1.

        If you use the version keyword, one of the following keywords must be specified:

          • 1 --SNMPv1. This option is not available with informs.
          • 2c --SNMPv2C.
          • 3 --SNMPv3. The most secure model because it allows packet encryption with the priv keyword. The default is noauth.
        • One of the following three optional security level keywords can follow the version 3 keywords:
          • auth--Enables Message Digest 5 (MD5) and Secure Hash Algorithm (SHA) packet authentication.
          • noauth--Specifies that the noAuthNoPriv security level applies to this host. This is the default security level for SNMPv3.
          • priv--Enables Data Encryption Standard (DES) packet encryption (also called "privacy").
        • The community-string argument specifies that a password-like community string be sent with the notification operation.
        • The cef keyword specifies that the Cisco Express Forwarding notification type is to be sent to the host. If no type is specified, all available notifications are sent.
         
        Step 5 end


        Example:
        Router(config)# end
         

        Exits to privileged EXEC mode.

         

        Configuring SNMP Notifications with SNMP Commands

        Perform the following task to configure SNMP notifications for Cisco Express Forwarding events. To configure this feature using the CLI instead of SNMP commands, see the Configuring SNMP Notifications with the CLI.

        Before You Begin

        You must have configured an NMS or SNMP agent to receive the SNMPCISCO-CEF-MIB notification. See the Configuring a Host to Receive Notifications.

        SUMMARY STEPS

          1.    setany version ip-address community-string cefPeerStateChangeNotifEnable.0 -i TruthValue

          2.    setany version ip-address community-string cefPeerFIBStateChangeNotifEnable .0 -i TruthValue

          3.    setany version ip-address community-string cefResourceFailureNotifEnable. 0 -i TruthValue

          4.    setany version ip-address community-string cefInconsistencyNotifEnable .0 -i TruthValue


        DETAILED STEPS
           Command or ActionPurpose
          Step 1 setany version ip-address community-string cefPeerStateChangeNotifEnable.0 -i TruthValue


          Example:
          workstation% setany -v2c 10.56.125.47 public cefPeeStateStateChangeNotifEnable.0 -1 1
           

          Enables the sending of CISCO-CEF-MIB SNMP notifications for changes in operational state of Cisco Express Forwarding peers.

          • The version argument specifies the version of SNMP that is used. Options are
            • -v1--SNMPv1
            • -v2c--SNMPv2C
            • -v3--SNMPv3
          • The ip-address argument is the IP address or IPv6 address of the SNMP notification host.

          The SNMP notification host is typically a network management station (NMS or SNMP manager). This host is the recipient of the SNMP traps or informs.

          • The community-string argument specifies that a password-like community string be sent with the notification operation.
          • The -ikeywords indicate that the variable that follows is an integer.
          • Values for the TruthValue argument are:
            • 1--enable sending of the notification
            • 2--disable sending of the notification

          These arguments and keywords apply to the Cisco-CEF-MIB notifications in Steps 2, 3, and 4.

           
          Step 2 setany version ip-address community-string cefPeerFIBStateChangeNotifEnable .0 -i TruthValue


          Example:
          workstation% setany -v2c 10.56.125.47 public cefPeerFIBStateChangeNotifEnable.0 -1 1
           

          Enables the sending of CISCO-CEF-MIB SNMP notifications for changes in the operational state of the Cisco Express Forwarding peer FIB.

          • See Step 1 for a description of the command arguments and keywords.
           
          Step 3 setany version ip-address community-string cefResourceFailureNotifEnable. 0 -i TruthValue


          Example:
          workstation% setany -v2c 10.56.125.47 public cefResourceFailureNotifEnable.0 -i 1
           

          Enables the sending of CISCO-CEF-MIB SNMP notifications for resource failures that affect Cisco Express Forwarding operations.

          • See Step 1 for a description of the command arguments and keywords.
           
          Step 4 setany version ip-address community-string cefInconsistencyNotifEnable .0 -i TruthValue


          Example:
          workstation% setany -v2c 10.56.125.47 public cefInconsistencyNotifEnable.0 -i 1
           

          Enables the sending of CISCO-CEF-MIB SNMP notifications for inconsistencies that occur when routing information is updated from the RIB to the Cisco Express Forwarding FIB on the RP and to the Cisco Express Forwarding FIB on the line cards.

          • See Step 1 for a description of the command arguments and keywords.
           

          Configuring the Throttling Interval with the CLI

          Perform the following task to configure the throttling interval for CISCO-CEF-MIB inconsistency notifications. To configure this feature using SNMP commands instead of the CLI, see the Configuring the Throttling Interval with SNMP Commands section.

          Configuring a throttling interval allows some time before an inconsistency notification is sent during the process of updating forwarding information from the Routing Information Base (RIB) to the RP and to the line card databases. As these databases are updated, inconsistencies might occur as a result of the asynchronous nature of the distribution mechanism for these databases. The throttling interval allows fleeting inconsistencies to resolve themselves before an inconsistency notification is sent.

          SUMMARY STEPS

            1.    enable

            2.    configure terminal

            3.    snmp-server enable traps cef inconsistency

            4.    snmp mib cef throttling-interval seconds

            5.    end


          DETAILED STEPS
             Command or ActionPurpose
            Step 1 enable


            Example:
            Router> enable
             

            Enables privileged EXEC mode.

            • Enter your password if prompted.
             
            Step 2 configure terminal


            Example:
            Router# configure terminal
             

            Enters global configuration mode.

             
            Step 3 snmp-server enable traps cef inconsistency


            Example:
            Router(config)# snmp-server enable traps cef inconsistency
             

            Enables the sending of CISCO-CEF-MIB SNMP notifications for inconsistencies in Cisco Express Forwarding.

             
            Step 4 snmp mib cef throttling-interval seconds


            Example:
            Router(config)# snmp mib cef throttling-interval 2500
             

            Sets the throttling interval for the CISCO-CEF-MIB inconsistency notifications.

            • The seconds argument is the time to allow before an inconsistency notification is sent during the process of updating forwarding information from the RIB to the RP and to the line card databases. A valid value is from 0 to 3600 seconds. A value of 0 disables throttle control.
             
            Step 5 end


            Example:
            Router(config)# end
             

            Exits to privileged EXEC mode.

             

            Configuring the Throttling Interval using SNMP Commands

            Perform the following task to configure the throttling interval for CISCO-CEF-MIB inconsistency notifications. To configure this feature using the CLI instead of SNMP commands, see the Configuring the Throttling Interval with the CLI.

            Configuring a throttling interval allows some time before an inconsistency notification is sent during the process of updating forwarding information from the Routing Information Base (RIB) to the RP and to the line card databases. As these databases are updated, inconsistencies might occur as a result of the asynchronous nature of the distribution mechanism for these databases. The throttling interval allows fleeting inconsistencies to resolve themselves before an inconsistency notification is sent.

            SUMMARY STEPS

              1.    setany version ip-address community-string cefNotifThrottlingInterval.0 -i seconds


            DETAILED STEPS
               Command or ActionPurpose
              Step 1 setany version ip-address community-string cefNotifThrottlingInterval.0 -i seconds


              Example:
              workstation% setany -v2c 10.56.125.47 public cefNotifThrottlingInterval.0 -1 3600
               

              Sets the throttling interval for the CISCO-CEF-MIB inconsistency notifications.

              • The version argument specifies the version of SNMP that is used. Options are
                • -v1--SNMPv1
                • -v2c--SNMPv2C
                • -v3--SNMPv3
              • The ip-address argument is the IP address or IPv6 address of the SNMP notification host.

              The SNMP notification host is typically a network management station (NMS or SNMP manager). This host is the recipient of the SNMP traps or informs.

              • The community-string argument specifies that a password-like community string be sent with the notification operation.
              • The -ikeywords indicate that the variable that follows is an integer.
              • The seconds argument is the time to allow before an inconsistency notification is sent during the process of updating forwarding information from the RIB to the RP and to the line card databases. A valid value is from 0 to 3600 seconds. A value of 0 disables throttle control.
               

              Configuration Examples for SNMP CEF-MIB Support

              Example Configuring a Host to Receive Notifications

              The following example shows how to configure an SNMP host to receive CISCO-CEF-MIB notifications:

              configure terminal
              !
              snmp-server community public ro
              
              snmp-server community private rw
              snmp-server host 10.56.125.47 informs version 2vc public cef
              end
              

              This example sets up SNMP host 10.56.125.47 to receive CISCO-CEF-MIB notifications as informs.

              Example Configuring SNMP Notifications

              This section contains examples for configuring SNMP notifications for Cisco Express Forwarding events using the CLI and using SNMP commands.

              Configuring SNMP Notifications for Cisco Express Forwarding Events Using the CLI

              This example shows how to use the CLI to configure CISCO-CEF-MIB SNMP notifications to be sent to host 10.56.125.47 as informs for changes in Cisco Express Forwarding peer states and peer FIB states, for Cisco Express Forwarding resource failures, and for inconsistencies in Cisco Express Forwarding events:

              configure terminal
              !
              snmp-server community public ro
              
              snmp-server host 10.56.125.47 informs version 2c public cef
              !
              snmp-server enable traps cef peer-state-change
              snmp-server enable traps cef peer-fib-state-change
              snmp-server enable traps cef inconsistency
              snmp-server enable traps cef resource-failure
              end

              Configuring SNMP Notifications for Cisco Express Forwarding Events Using SNMP Commands

              This example shows the use of SNMP command to configure CISCO-CEF-MIB SNMP notifications to be sent to host 10.56.125.47 for changes in Cisco Express Forwarding peer states and peer FIB states, for Cisco Express Forwarding resource failures, and for inconsistencies in Cisco Express Forwarding events:

              setany -v2c 10.56.125.47 public cefPeerStateChangeNotifEnable.0 -i 1
              setany -v2c 10.56.125.47 public cefPeerFIBStateChangeNotifEnable.0 -i 1
              setany -v2c 10.56.125.47 public cefResourceFailureNotifEnable.0 -i 1
              setany -v2c 10.56.125.47 public cefInconsistencyNotifEnabled.0 -i 1

              Example Configuring the Throttling Interval

              This example shows the configuration of a throttling interval for the sending of Cisco Express Forwarding inconsistency notifications to the SNMP host using CLI commands and SNMP commands. The throttling interval is the amount of time that passes between the time that the inconsistency occurs and the sending of the notification to the SNMP host.

              Configuring the Throttling Interval for CISCO-CEF-MIB Inconsistency Notifications Using CLI Commands

              This example shows the addition of a throttling interval of 1000 seconds for the sending of Cisco Express Forwarding inconsistency notifications to the SNMP host using CLI commands:

              configure terminal
              !
              snmp-server community public ro
              
              snmp-server host 10.56.125.47 informs version 2c public cef
              !
              snmp-server enable traps cef peer-state-change
              snmp-server enable traps cef peer-fib-state-change
              snmp-server enable traps cef inconsistency
              snmp-server enable traps cef resource-failure
              !
              snmp mib cef throttling-interval 1000
              end
              

              Configuring the Throttling Interval for CISCO-CEF-MIB Inconsistency Notifications Using SNMP Commands

              This example shows the addition of a throttling interval of 1000 seconds for the sending of Cisco Express Forwarding inconsistency notifications to the SNMP host using an SNMP command:

              setany -v2c 10.56.125.47 public cefNotifThrottlingInterval.0 -1 1000

              Additional References

              Related Documents

              Related Topic

              Document Title

              Cisco IOS commands

              Cisco IOS Master Commands List, All Releases

              IP switching commands: complete command syntax, command modes, command history, defaults, usage guidelines, and examples.

              Cisco IOS IP Switching Command Reference

              Overview of Cisco Express Forwarding, and links to related Cisco Express Forwarding documents

              "Cisco Express Forwarding Overview" module

              Standards

              Standard

              Title

              No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.

              --

              MIBs

              MIB

              MIBs Link

              No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.

              To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

              http:/​/​www.cisco.com/​go/​mibs

              RFCs

              RFC

              Title

              RFC 3291

              Textual Conventions for Internet Network Addresses

              RFC 3413

              Simple Network Management Protocol (SNMP) Applications

              Technical Assistance

              Description

              Link

              The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

              http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

              Feature Information for SNMP CEF-MIB Support

              The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

              Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

              Table 20 Feature Information for Cisco Express Forwarding--SNMP CEF-MIB Support

              Feature Name

              Release

              Feature Information

              Cisco Express Forwarding--SNMP CEF-MIB Support

              12.2(31)SB2 12.2(33)SRC 12.2(33)SB 12.4(20)T 15.0(1)M 12.2(33)SRE 12.2(50)SY

              The Cisco Express Forwarding--SNMP CEF-MIB Support feature introduces the CISCO-CEF-MIB that allows management applications through the use of the Simple Network Management Protocol (SNMP) to configure and monitor Cisco Express Forwarding operational data and to provide notification when Cisco Express Forwarding encounters specific configured events. This module describes how to use the CISCO-CEF-MIB to manage and monitor objects related to Cisco Express Forwarding operation.

              The following commands were introduced or modified: snmp mib cef throttling-interval, snmp-server enable traps cef, snmp-server host.

              Glossary

              inform --A type of notification message that is more reliable than a conventional trap notification message because the informs message notification requires acknowledgment, but a trap notification does not.

              IPC --Inter-Process Communication. The protocol used by routers that support distributed packet forwarding. The Cisco IOS version of IPC provides a reliable ordered delivery of messages using an underlying platform driver transport or User Date Protocol (UDP) transport protocol. Cisco IOS software IPC services allow line cards (LCs) and the central route processor (RP) in a distributed system, such as a Cisco 7500 series router, to communicate with each other by exchanging messages from the RP to the LCs. Communication messages are also exchanged between active and standby RPs. The IPC messages include configuration commands, responses to the configuration commands, and other events that are reported by an LC to the RP.

              MIB --Management Information Base. A database of network management information that is used and maintained by a network management protocol such as Simple Network Management Protocol (SNMP). The value of a MIB object can be changed or retrieved by the use of SNMP commands, usually through a network management system. MIB objects are organized in a tree structure that includes public (standard) and private (proprietary) branches.

              NMS --network management station. A powerful, well-equipped computer (typically an engineering workstation) that is used by a network administrator to communicate with other devices in the network. An NMS is typically used to manage network resources, gather statistics, and perform a variety of network administration and configuration tasks. In the context of SNMP, an NMS is a device that performs SNMP queries to the SNMP agent of a managed device to retrieve or modify information.

              notification --A message sent by a Simple Network Management Protocol (SNMP) agent to a network management station, console, or terminal to indicate that a significant network event has occurred.

              SNMP --Simple Network Management Protocol. A network management protocol used almost exclusively in TCP/IP networks. SNMP enables a user to monitor and control network devices, manage configurations, collect statistics, monitor performance, and ensure network security.

              SNMP community --An authentication scheme that enables an intelligent network device to validate SNMP requests.

              SNMPv2c --Version 2c of the Simple Network Management Protocol. SNMPv2c supports centralized as well as distributed network management strategies and includes improvements in the Structure of Management Information (SMI), protocol operations, management architecture, and security.

              SNMPv3 --Version 3 of the Simple Network Management Protocol. Interoperable standards-based protocol for network management. SNMPv3 provides secure access to devices by a combination of authenticating and encrypting packets over the network.

              trap --A message sent by an SNMP agent to a network management station, console, or terminal to indicate that a significant network event has occurred. Traps are less reliable than inform requests, because the receiver of the trap does not send an acknowledgment of receipt; furthermore, the sender of the trap cannot determine if the trap was received.