IP Routing: OSPF Configuration Guide, Cisco IOS Release 15M&T
OSPFv3 Max-Metric Router LSA
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OSPFv3 Max-Metric Router LSA

Last Updated: November 30, 2012

The Open Shortest Path First version 3 (OSPFv3) max-metric router link-state advertisement (LSA) feature enables OSPFv3 to advertise its locally generated router LSAs with a maximum metric. The feature allows OSPFv3 processes to converge but not attract transit traffic through the device if there are better alternate paths.

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.

Information About OSPFv3 Max-Metric Router LSA

OSPFv3 Max-Metric Router LSA

The OSPFv3 max-metric router LSA feature enables OSPFv3 to advertise its locally generated router LSAs with a maximum metric. The feature allows OSPFv3 processes to converge but not attract transit traffic through the device if there are better alternate paths. After a specified timeout or a notification from Border Gateway Protocol (BGP), OSPFv3 advertises the LSAs with normal metrics.

The max-metric LSA control places the OSPFv3 router into the stub router role using its LSA advertisement. A stub router only forwards packets destined to go to its directly connected links. In OSPFv3 networks, a device could become a stub router by advertising large metrics for its connected links, so that the cost of a path through this device becomes larger than that of an alternative path. OSPFv3 stub router advertisement allows a device to advertise the infinity metric (0xFFFF) for its connected links in router LSAs and advertise the normal interface cost if the link is a stub network.

How to Configure OSPFv3 Max-Metric Router LSA

Configuring the OSPFv3 Max-Metric Router LSA

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    router ospfv3 process-id

4.    max-metric router-lsa [external-lsa [max-metric-value]] [include-stub] [inter-area-lsas [max-metric-value]] [on-startup {seconds | wait-for-bgp}] [prefix-lsa] [stub-prefix-lsa [max-metric-value]] [summary-lsa [max-metric-value]]

5.    exit

6.    show ospfv3 [process-id] max-metric


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
router ospfv3 process-id


Example:

Device(config)# router ospfv3 1

 

Enables OSPFv3 router configuration mode.

 
Step 4
max-metric router-lsa [external-lsa [max-metric-value]] [include-stub] [inter-area-lsas [max-metric-value]] [on-startup {seconds | wait-for-bgp}] [prefix-lsa] [stub-prefix-lsa [max-metric-value]] [summary-lsa [max-metric-value]]


Example:

Device(config-router)# max-metric router-lsa on-startup wait-for-bgp

 

Configures a device that is running the OSPFv3 protocol to advertise a maximum metric so that other devices do not prefer the device as an intermediate hop in their SPF calculations.

 
Step 5
exit


Example:

Device(config-router)# exit

 

Leaves the current configuration mode.

  • Enter this command twice to reach privileged EXEC mode.
 
Step 6
show ospfv3 [process-id] max-metric


Example:

Device# show ospfv3 1 max-metric

 

Displays OSPFv3 maximum metric origination information.

 

Configuration Examples for OSPFv3 Max-Metric Router LSA

Example: Configuring the OSPFv3 Max-Metric Router LSA

Router# show ipv6 ospf max-metric 

            OSPFv3 Router with ID (192.1.1.1) (Process ID 1)

 Start time: 00:00:05.886, Time elapsed: 3d02h
 Originating router-LSAs with maximum metric
    Condition: always, State: active

Additional References

Related Documents

Related Topic Document Title

IPv6 addressing and connectivity

IPv6 Configuration Guide

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

IPv6 commands

Cisco IOS IPv6 Command Reference

Cisco IOS IPv6 features

Cisco IOS IPv6 Feature Mapping

OSPFv3 Max-Metric Router LSA

"OSPF Link-State Advertisement Throttling " module

Standards and RFCs

Standard/RFC Title

RFCs for IPv6

IPv6 RFCs

MIBs

MIB

MIBs Link

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

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 OSPFv3 Max-Metric Router LSA

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 1Feature Information for OSPFv3 Max-Metric Router LSA
Feature Name Releases Feature Information

OSPFv3 Max-Metric Router LSA

15.1(3)S

15.2(1)T

The OSPFv3 max-metric router LSA feature enables OSPF to advertise its locally generated router LSAs with a maximum metric.

The following commands were introduced or modified: max-metric router-lsa, show ipv6 ospf max-metric, show ospfv3 max-metric.

Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: 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. (1110R)

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.

© 2012 Cisco Systems, Inc. All rights reserved.