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Table Of Contents
QoS CBQoS MIB Index Enhancements
Prerequisites for the QoS CBQoS MIB Index Enhancements
Restrictions for the QoS CBQoS MIB Index Enhancements
Information About the QoS CBQoS MIB Index Enhancements
Feature Overview of the QoS CBQoS MIB Index Enhancements
Benefits of the QoS CBQoS MIB Index Enhancements
How to Configure the QoS CBQoS MIB Index Enhancements
Enabling Cisco IOS MIB and CBQoS MIB Index Persistence
Verifying CBQoS MIB Index Persistence
Configuration Examples for the QoS CBQoS MIB Index Enhancements
Example: Enabling Cisco IOS MIB and CBQoS MIB Index Persistence
Examples: Verifying Cisco IOS MIB and CBQoS MIB Index Persistence
Feature Information for the QoS CBQoS MIB Index Enhancements
QoS CBQoS MIB Index Enhancements
First Published: October 31, 2005Last Updated: March 24, 2011The QoS: 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
For the latest feature information and caveats, see 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 for the QoS CBQoS MIB Index Enhancements" section.
Use Cisco Feature Navigator to find information about platform support and Cisco IOS XE software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Contents
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Prerequisites for the QoS CBQoS MIB Index Enhancements
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Prerequisites for the QoS CBQoS MIB Index Enhancements
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.
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Restrictions for the QoS CBQoS MIB Index Enhancements
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.
Information About the QoS CBQoS MIB Index Enhancements
Feature Overview of the QoS CBQoS MIB Index Enhancements
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.
The index encoding scheme has been changed to handle the performance/scalability issue. Each service policy is uniquely identified by an index called cbQosPolicyIndex, and its cbQosObjectsIndex is uniquely identified under the service policy.
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Benefits of the QoS CBQoS MIB Index Enhancements
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.
How to Configure the QoS CBQoS MIB Index Enhancements
Enabling Cisco IOS MIB and CBQoS MIB Index Persistence
SUMMARY STEPS
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or
writeDETAILED STEPS
Step 1
enable
Example:Router> enable
Enables privileged EXEC mode.
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Step 2
configure terminal
Example:Router# configure terminal
Enters global configuration mode.
Step 3
snmp-server ifindex persist
Example:Router(config)# snmp-server ifindex persist
Enables Cisco IOS MIB index (ifIndex) persistence.
Step 4
snmp mib persist [cbqos | v3mibs]
Example:Router(config)# snmp mib persist cbqos
Enables MIB persistence.
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Enable 'snmp-server ifindex persist' for persist cbqos indexStep 5
end
Example:Router(config)# end
Returns to privileged EXEC mode.
Step 6
write mib-data
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write
Example:Router# write mib-data
or
Router# write
Saves CBQoS MIB data to NVRAM.
Verifying CBQoS MIB Index Persistence
SUMMARY STEPS
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DETAILED STEPS
Configuration Examples for the QoS CBQoS MIB Index Enhancements
Example: Enabling Cisco IOS MIB and CBQoS MIB Index Persistence
The following example enables Cisco IOS MIB (ifIndex) and CBQoS MIB index persistence:
Router# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Router(config)# snmp-server ifindex persistRouter(config)# snmp mib persist cbqosExamples: Verifying Cisco IOS MIB and CBQoS MIB Index Persistence
The following examples verify that Cisco IOS MIB (ifIndex) and CBQoS MIB index persistence have been configured:
Router# show running-config | include cbqossnmp mib persist cbqosRouter# show running-config | include persistsnmp-server ifindex persistsnmp mib persist cbqosAdditional References
Related Documents
QoS commands
SNMP commands
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.
Standards
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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MIBs
RFCs
Technical Assistance
Feature Information for the QoS CBQoS MIB Index Enhancements
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 XE 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
Cisco and the Cisco Logo are trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and other countries. A listing of Cisco's trademarks can be found at www.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1005R)
Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.
© 2011 Cisco Systems, Inc. All rights reserved.
