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QoS: CBQoS MIB Index Enhancements

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QoS: CBQoS MIB Index Enhancements

Contents

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

Enabling Cisco IOS MIB and CBQoS MIB Index Persistence: Example

Verifying Cisco IOS MIB and CBQoS MIB Index Persistence: Examples

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

snmp mib persist

Feature Information for the QoS: CBQoS MIB Index Enhancements

Glossary


QoS: CBQoS MIB Index Enhancements

First Published: October 31, 2005
Last Updated: December 4, 2006

The 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 in This Module

Your Cisco IOS software release may not support all of the features documented in this module. 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 QoS: 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 Cisco IOS and Catalyst OS 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

•Prerequisites for the QoS: CBQoS MIB Index Enhancements

•Restrictions for the QoS: CBQoS MIB Index Enhancements

•Information About the QoS: CBQoS MIB Index Enhancements

•How to Configure the QoS: CBQoS MIB Index Enhancements

•Configuration Examples for the QoS: CBQoS MIB Index Enhancements

•Additional References

•Command Reference

•Feature Information for the QoS: CBQoS MIB Index Enhancements

•Glossary

Prerequisites for the QoS: 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.

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

To use the QoS: CBQoS MIB Index Enhancements feature, you should understand the following concepts:

•Feature Overview of the QoS: CBQoS MIB Index Enhancements

•Benefits of 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.

Benefits of the QoS: CBQoS MIB Index Enhancements

Provide a Method to Produce MIB Indexes

These enhancements provide a repeatable method for generating MIB indexes so that they do not change between reboots.

Reduce Complexity for Network Management Applications

The complexity of configuring and correlating statistics objects is reduced, making it easier for network management applications to gather accurate information.

Maintain Compatibility with Previous MIBs

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.

How to Configure the QoS: CBQoS MIB Index Enhancements

This section contains the following procedures:

•Enabling Cisco IOS MIB and CBQoS MIB Index Persistence (required)

•Verifying CBQoS MIB Index Persistence (optional)

Enabling Cisco IOS MIB and CBQoS MIB Index Persistence

Perform this task to enable Cisco IOS MIB and CBQoS MIB index persistence.

SUMMARY STEPS

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

DETAILED STEPS

 
Command or Action
Purpose

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 ifindex persist

Example:

Router(config)# snmp-server ifindex persist

Enables Cisco IOS MIB index (ifIndex) persistence.

Step 4 

snmp mib persist [event | expression | circuit | cbqos]

Example:

Router(config)# snmp mib persist cbqos

Enables MIB persistence.

•The optional event keyword enables Event MIB persistence.

•The optional expression keyword enables Expression MIB persistence.

•The optional circuit keyword enables Circuit MIB persistence.

•The optional cbqos keyword enables CBQoS MIB persistence.

Note If you have not enabled Cisco IOS MIB index (ifIndex) persistence (Step 3), the following message appears when you issue the snmp mib persist cbqos command:
Enable 'snmp-server ifindex persist' for persist cbqos index

Step 5 

end

Example:

Router(config)# end

Returns to privileged EXEC mode.

Step 6 

write mib-data

or

write

Example:

Router# write mib-data

or

Router# write

Saves CBQoS MIB data to NVRAM.


Verifying CBQoS MIB Index Persistence

Perform the following task to verify that CBQoS MIB index persistence has been enabled.

SUMMARY STEPS

1. enable

2. show running-config | include cbqos

3. exit

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

show running-config | include cbqos

Example:

Router# show running-config | include cbqos

Displays the configuration information currently running on the router.

Note The information should include snmp mib persist cbqos.

Step 3 

exit

Example:

Router# exit

Returns to user EXEC mode.

Configuration Examples for the QoS: CBQoS MIB Index Enhancements

This section provides the following configuration examples:

•Enabling Cisco IOS MIB and CBQoS MIB Index Persistence: Example

•Verifying Cisco IOS MIB and CBQoS MIB Index Persistence: Examples

Enabling Cisco IOS MIB and CBQoS MIB Index Persistence: Example

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

Verifying Cisco IOS MIB and CBQoS MIB Index Persistence: Examples

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

Additional References

The following sections provide references related to the QoS: CBQoS MIB Index Enhancements.

Related Documents

Related Topic
Document Title

SNMP commands

Cisco IOS Network Management Command Reference,
Release 12.4T

Cisco IOS Network Management Command Reference,
Release 12.2 SR

SNMP configuration tasks

"Configuring SNMP Support" chapter in the Cisco IOS Network Management Configuration Guide, Release 12.4T

MIB persistence

"Distributed Management Event and Expression MIB Persistence" chapter in the Cisco IOS Network Management Configuration Guide, Release 12.4T

Other documentation

For information on using SNMP MIB features, see the appropriate documentation for your network management system.


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

CISCO-CLASS-BASED-QOS-MIB, Revision 13

Note The CISCO-CLASS-BASED-QOS-MIB is actually two MIBs: the CISCO-CLASS-BASED-QOS-MIB and the CISCO-CLASS-BASED-QOS-CAPABILITY-MIB.

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 2233

The Interfaces Group MIB using SMIv2


Technical Assistance

Description
Link

The Cisco Technical Support & Documentation website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, tools, and technical documentation. Registered Cisco.com users can log in from this page to access even more content.

http://www.cisco.com/techsupport


Command Reference

This section documents modified commands only.

•snmp mib persist

snmp mib persist

To enable MIB persistence, use the snmp mib persist command in global configuration mode. To disable MIB persistence, use the no form of this command.

snmp mib persist [event | expression | circuit | cbqos]

no snmp mib persist [event | expression | circuit | cbqos]

Syntax Description

event

(Optional) Enables Event MIB persistence.

expression

(Optional) Enables Expression MIB persistence.

circuit

(Optional) Enables Circuit MIB persistence.

cbqos

(Optional) Enables class-based (CB) quality of service (QoS) MIB persistence.


Command Default

MIB persistence is disabled.

Command Modes

Global configuration

Command History

Release
Modification

12.2(2)T

This command was introduced.

12.2(4)T3

Support for event and expression MIBs was added.

12.4(4)T

The cbqos keyword was added.

12.0(32)S

This command was integrated into Cisco IOS Release 12.0(32)S.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.


Usage Guidelines

After entering the snmp mib persist command, you must enter the write mib-data command to save MIB persistence configuration data to NVRAM.

The Circuit Interface MIB provides a MIB object (cciDescr) that can be used to identify individual circuit-based interfaces for Simple Network Management Protocol (SNMP) monitoring. Circuit interface identification persistence maintains the user-defined name of the circuit across reboots by retaining the value of the cciDescr object in the Circuit Interface MIB (CISCO-CIRCUIT-INTERFACE-MIB). A consistent value for specific circuits is useful for network management applications that use SNMP. Circuit interface identification persistence is enabled using the snmp mib persist circuit global configuration command. This command is disabled by default because this feature uses NVRAM memory.

To enable MIB persistence for all available MIB types, use the snmp mib persist command without keywords.

Examples

The following example shows how to enable Event MIB persistence: 

Router(config)# snmp mib persist event

Router(config)# end 

Router# write mib-data

Related Commands

Command
Description

snmp ifindex persist

Enables or disables SNMP interface index values that remain constant across reboots only on a specific interface.

snmp-server ifindex persist

Globally enables SNMP interface index values that remain constant across reboots.

write mib-data

Saves MIB persistence configuration data to NVRAM.


Feature Information for the QoS: CBQoS MIB Index Enhancements

Table 1 lists the release history for this feature.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

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.

Table 1 Feature Information for the QoS: CBQoS MIB Index Enhancements

Feature Name
Releases
Feature Information

QoS: CBQoS MIB Index Enhancements

12.4(4)T,
12.0(32)S,
12.2(31)SB2

The CBQoS MIB Index Enhancements feature introduces persistence across all CBQoS MIB indexes including cbQosConfigIndex, cbQosObjectsIndex, and cbQosPolicyIndex.

In 12.4(4)T, this feature was introduced.

In 12.0(32)S, this feature was integrated into the release.

In 12.2(31)SB2, support for the Cisco 10000 Series routers and the Cisco 7304 router was introduced.


Glossary

LSR—label switch router. A Multiprotocol Label Switching (MPLS) node that can forward native Layer 3 packets. The LSR forwards a packet based on the value of a label attached to the packet.

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 using SNMP commands, usually through a network management system. MIB objects are organized in a tree structure that includes public (standard) and private (proprietary) branches.

MQC—Modular Quality of Service (QoS) Command-Line Interface (CLI). A way to specify a traffic class independently of QoS policies by defining a common command syntax and resulting set of QoS behaviors across platforms. This model replaces the previous one of defining unique syntax for each QoS feature and for each platform.

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.

policy map—Any defined rule that determines the use of resources within the network. A QoS policy map identifies the traffic class to which it applies and the instructions for one or more actions to take on that traffic.

QoS—quality of service. A measure of performance for a transmission system that reflects its transmission quality and service availability. Quality of service focuses on achieving appropriate network performance for networked applications; it is superior to best effort performance.

SNMP—Simple Network Management Protocol. A management protocol used almost exclusively in TCP/IP networks. SNMP provides a means for monitoring and controlling network devices and for managing configurations, statistics collection, performance, and security.

Note See Internetworking Terms and Acronyms for terms not included in this glossary.


Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.

© 2006 Cisco Systems, Inc. All rights reserved.