MIB Persistence

The MIB Persistence feature allows the Simple Network Management Protocol (SNMP) data of a MIB to be persistent across reloads; that is, the MIB information retains the same set object values each time a networking device reboots.

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.

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.

Information about MIB Persistence

MIB Persistence

The MIB Persistence feature allows the SNMP data of a MIB to be persistent across reloads; that is, the MIB information retains the same set object values each time a networking device reboots. MIB Persistence is enabled by issuing the snmp mib persist command, and the MIB data of all MIBs that have had persistence enabled using this command is then written to NVRAM by issuing the write mib-data command. All modified MIB data must be written to NVRAM using the write mib-data command.

Both Event and Expression MIBs allow you to configure a value for an object and to set up object definitions. Both allow rows of data to be modified while the row is in an active state.

Scalar objects are stored every time they are changed, and table entries are stored only if the row is in an active state. The Event MIB has two scalar objects and nine tables to be persisted into NVRAM. The tables are as follows:

  • mteEventNotificationTable

  • mteEventSetTable

  • mteEventTable

  • mteObjectsTable

  • mteTriggerBooleanTable

  • mteTriggerDeltaTable

  • mteTriggerExistenceTable

  • mteTriggerTable

  • mteTriggerThresholdTable

The Expression MIB has two scalar objects and three tables to be stored in NVRAM. The scalar objects are expResourceDeltaMinimum and expResourceDeltaWildcardInstanceMaximum. The tables are as follows:

  • expExpressionTable

  • expNameTable

  • expObjectTable

Writing MIB data to NVRAM may take several seconds. The length of time depends on the amount of MIB data.

Event MIB Persistence and Expression MIB Persistence both allow MIB objects to be saved from reboot to reboot, allowing long-term monitoring of specific devices and interfaces, and configurations of object values that are preserved across reboots.

How to Configure MIB Persistence

Configuring MIB Persistence


Note

Depending on your release, configuration of MIB persistence is automatic and is not required to perform manual configuration.

The MIB Persistence features allow the SNMP data of a MIB to be persistent across reloads, that is, MIB information retains the same set of object values each time a networking device reboots. The following sections contain tasks for using Distributed Management Event and Expression MIB persistence.

Prerequisites

  • SNMP is configured on your networking device.

  • Values for Event MIB and Expression MIB have been configured.

Restrictions

  • If the number of MIB objects to persist increases, the NVRAM storage capacity may be strained. Occasionally, the time taken to write MIB data to NVRAM may be longer than expected.

  • The Distributed Management Event MIB Persistence feature is not supported on all Cisco platforms. Use Cisco Feature Navigator to find information about platform support and Cisco software image support.

Enabling and Disabling Event MIB Persistence

Perform this task to configure Event MIB Persistence.


Note

Event MIB Persistence is disabled by default.

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    snmp mib persist event

    4.    no snmp mib persist event

    5.    end

    6.    write mib-data

    7.    copy running-config startup-config


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Device> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.

     
    Step 2 configure terminal


    Example:
    Device# configure terminal
     

    Enters global configuration mode.

     
    Step 3 snmp mib persist event


    Example:
    Device(config)# snmp mib persist event
     

    Enables MIB Persistence for the Event MIB.

     
    Step 4 no snmp mib persist event


    Example:
    Device(config)# no snmp mib persist event
     

    (Optional) Disables MIB Persistence for the Event MIB.

     
    Step 5 end


    Example:
    Device(config)# end
     

    Exits global configuration mode.

     
    Step 6 write mib-data


    Example:
    Device# write mib-data
     

    Saves the Event MIB Persistence configuration data to NVRAM.

     
    Step 7 copy running-config startup-config


    Example:
    Device# copy running-config startup-config
     

    Copies the running configuration to the startup configuration.

     

    Enabling and Disabling Expression MIB Persistence

    Perform this task to configure Expression MIB Persistence.


    Note

    Expression MIB Persistence is disabled by default.

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    snmp mib persist expression

      4.    no snmp mib persist expression

      5.    end

      6.    write mib-data

      7.    copy running-config startup-config

      8.    more system:running-config


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 enable


      Example:
      Device> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.

       
      Step 2 configure terminal


      Example:
      Device# configure terminal
       

      Enters global configuration mode.

       
      Step 3 snmp mib persist expression


      Example:
      Device(config)# snmp mib persist expression
       

      Enables MIB Persistence for Expression MIB.

       
      Step 4 no snmp mib persist expression


      Example:
      Device(config)# no snmp mib persist expression
       

      (Optional) Disables MIB Persistence for Expression MIB.

       
      Step 5 end


      Example:
      Device(config)# end
       

      Exits global configuration mode.

       
      Step 6 write mib-data


      Example:
      Device# write mib-data
       

      Saves the Expression MIB Persistence configuration data to NVRAM.

       
      Step 7 copy running-config startup-config


      Example:
      Device# copy running-config startup-config
       

      Copies the running configuration to the startup configuration.

       
      Step 8 more system:running-config


      Example:
      Device# more system:running-config
       

      Displays the currently running configuration.

      • Use this command to verify the MIB persistence configuration.

       

      Additional References

      Related Documents

      Related Topic

      Document Title

      Cisco IOS commands

      Cisco IOS Master Command List, All Releases

      SNMP commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples

      Cisco IOS SNMP Command Reference

      Cisco implementation of RFC 1724, RIP Version 2 MIB Extensions

      RIPv2 Monitoring with SNMP Using the RFC 1724 MIB Extensions feature module

      DSP Operational State Notifications for notifications to be generated when a digital signaling processor (DSP) is used

      DSP Operational State Notifications feature module

      Standards and RFCs

      Standard/RFC

      Title

      CBC-DES (DES-56) standard

      Symmetric Encryption Protocol

      STD: 58

      Structure of Management Information Version 2 (SMIv2)

      RFC 1067

      A Simple Network Management Protocol

      RFC 1091

      Telnet terminal-type option

      RFC 1098

      Simple Network Management Protocol (SNMP)

      RFC 1157

      Simple Network Management Protocol (SNMP)

      RFC 1213

      Management Information Base for Network Management of TCP/IP-based internets:MIB-II

      RFC 1215

      Convention for defining traps for use with the SNMP

      RFC 1901

      Introduction to Community-based SNMPv2

      RFC 1905

      Common Management Information Services and Protocol over TCP/IP (CMOT)

      RFC 1906

      Telnet X Display Location Option

      RFC 1908

      Simple Network Management Protocol (SNMP)

      RFC 2104

      HMAC: Keyed-Hashing for Message Authentication

      RFC 2206

      RSVP Management Information Base using SMIv2

      RFC 2213

      Integrated Services Management Information Base using SMIv2

      RFC 2214

      Integrated Services Management Information Base Guaranteed Service Extensions using SMIv2

      RFC 2271

      An Architecture for Describing SNMP Management Frameworks

      RFC 2570

      Introduction to Version 3 of the Internet-standard Network Management Framework

      RFC 2578

      Structure of Management Information Version 2 (SMIv2)

      RFC 2579

      Textual Conventions for SMIv2

      RFC 2580

      Conformance Statements for SMIv2

      RFC 2981

      Event MIB

      RFC 2982

      Distributed Management Expression MIB

      RFC 3413

      SNMPv3 Applications

      RFC 3415

      View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)

      RFC 3418

      Management Information Base (MIB) for the Simple Network Management Protocol (SNMP)

      MIBs

      MIB

      MIBs Link

      • Circuit Interface Identification MIB

      • Cisco SNMPv2

      • Ethernet-like Interfaces MIB

      • Event MIB

      • Expression MIB Support for Delta, Wildcarding, and Aggregation

      • Interfaces Group MIB (IF-MIB)

      • Interfaces Group MIB Enhancements

      • MIB Enhancements for Universal Gateways and Access Servers

      • MSDP MIB

      • NTP MIB

      • Response Time Monitor MIB

      • Virtual Switch MIB

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

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

      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 MIB Persistence

      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 . An account on Cisco.com is not required.
      Table 1 Feature Information for MIB Persistence

      Feature Name

      Releases

      Feature Information

      MIB Persistence

      12.0(5)T

      12.0(12)S

      12.1(3)T

      12.2(4)T

      12.2(4)T3

      The MIB Persistence feature allows the SNMP data of a MIB to be persistent across reloads; this means MIB information retains the same set object values each time a networking device reboots. MIB Persistence is enabled by using the snmp mib persist command, and the MIB data of all MIBs that have had persistence enabled using this command is then written to NVRAM storage by using the write mib-data command. Any modified MIB data must be written to the NVRAM memory using the write mib-data command.