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The Class-Based Quality of Service (CBQoS) MIB Index Enhancements feature introduces persistence across all CBQoS MIB indexes including cbQosConfigIndex, cbQosObjectsIndex, and cbQosPolicyIndex.
Finding Feature Information in This Module
Your Cisco IOS software release may not support all of the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the "Feature Information for the CBQoS MIB Index Enhancements" section.
Finding Support Information for Platforms and Cisco IOS and Catalyst OS Software Images
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
•Prerequisites for the CBQoS MIB Index Enhancements
•Restrictions for the CBQoS MIB Index Enhancements
•Information About the CBQoS MIB Index Enhancements
•How to Configure the CBQoS MIB Index Enhancements
•Configuration Examples for the CBQoS MIB Index Enhancements
•Feature Information for the CBQoS MIB Index Enhancements
•Simple Network Management Protocol (SNMP) must be installed and enabled on the label switch routers (LSRs).
•You must enable ifMIB persistence by issuing the snmp-server ifindex persist command. Then issue the snmp mib persist cbqos command to enable CBQoS MIB index persistence.
Note If you issue the snmp mib persist cbqos command before the snmp-server ifindex persist command, you receive a prompt requesting you to enable ifIndex persistence first.
If the internal hashing of configuration strings causes too many collisions, NVRAM storage may become tight. You can issue the more nvram command to display a new collision file called cbqos-mib to help you keep track of the size.
The cbQosConfigIndex, cbQosObjectsIndex, and cbQosPolicyIndex are volatile because when a networking device reboots, the index numbers may change. This happens because system rebooting can cause the order of the Modular QoS CLI (MQC) configuration to differ from the actual configuration order, which is user-driven and unpredictable. As a result, you must read the MIB frequently to extract statistical and configuration information. Therefore, once a reload has occurred, the MIB has to be repolled to reestablish the indexes to the data stored in the CBQoS MIB.
Traditionally, MIB persistence is handled by Cisco IOS APIs, which save the index and key information to NVRAM. The data is then retrieved and repopulated after reloading. However, this approach does not work well for the current implementation of the cbQosObjectsIndex because of the large amount of information that needs to be saved.
An index encoding scheme based on configuration entries instead of operational sequence is being implemented to provide persistent indexes on router reload so that MIB information retains the same set of object values each time that a networking device reboots.
These enhancements provide a repeatable method for generating MIB indexes so that they do not change between reboots.
The complexity of configuring and correlating statistics objects is reduced, making it easier for network management applications to gather accurate information.
You do not need to make any changes to your Network Management Station (NMS) software since this feature is an infrastructure improvement that is backward compatible with older MIBs.
1. enable
2. configure terminal
3. snmp-server ifindex persist
4. snmp mib persist [event | expression | circuit | cbqos]
5. end
6. write mib-data
or
write
1. enable
2. show running-config | include cbqos
3. exit
The following example enables Cisco IOS MIB (ifIndex) and CBQoS MIB index persistence:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# snmp-server ifindex persist
Router(config)# snmp mib persist cbqos
The following examples verify that Cisco IOS MIB (ifIndex) and CBQoS MIB index persistence have been configured:
Router# show running-config | include cbqos
snmp mib persist cbqos
Router# show running-config | include persist
snmp-server ifindex persist
snmp mib persist cbqos
The following sections provide references related to the CBQoS MIB Index Enhancements.
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SNMP commands |
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SNMP configuration tasks, MIB persistence |
"Configuring SNMP Support" module |
Other documentation |
For information on using SNMP MIB features, see the appropriate documentation for your network management system. |
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No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature. |
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RFC 2233 |
The Interfaces Group MIB using SMIv2 |
The following commands are introduced or modified in the feature or features documented in this module. For information about these commands, see the Cisco IOS Quality of Service Solutions Command Reference at http://www.cisco.com/en/US/docs/ios/qos/command/reference/qos_book.html. For information about all Cisco IOS commands, use the Command Lookup Tool at http://tools.cisco.com/Support/CLILookup or a Cisco IOS master commands list.
•snmp mib persist
Table 1 lists the release history for this feature.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.