Configuring OSPFv3 Max-Metric Router LSA

Information About OSPFv3 Max-Metric Router LSA

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.

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.

Configuring the OSPFv3 Max-Metric Router LSA

Procedure

  Command or Action Purpose

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

address-family ipv6 unicast

Example:


Device(config)# address-family ipv6 unicast

Configures an instance of the OSPFv3 process in the IPv6 address family.

Step 5

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-af)# 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 6

end

Example:


Device(config-router-af)# end

Exits address family configuration mode and returns to privileged EXEC mode.

Step 7

show ospfv3 [process-id ] max-metric

Example:


Device# show ospfv3 1 max-metric

Displays OSPFv3 maximum metric origination information.

Example: Verifying the OSPFv3 Max-Metric Router LSA

Device#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

OSPFv3 Max-Metric Router LSA

“OSPF Link-State Advertisement Throttling ” module

Standards and RFCs

Standard/RFC

Title

RFCs for IPv6

IPv6 RFCs

Feature History for OSPFv3 Max-Metric Router LSA

This table provides release and related information for the features explained in this module.

These features are available in all the releases subsequent to the one they were introduced in, unless noted otherwise.

Release

Feature

Feature Information

Cisco IOS XE Gibraltar 16.11.1

OSPFv3 Max-Metric Router LSA

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.

Cisco IOS XE Cupertino 17.7.1

OSPFv3 Max-Metric Router LSA

This feature was implemented on the Cisco Catalyst 9600 Series Supervisor 2 Module (C9600X-SUP-2).

Use the Cisco Feature Navigator to find information about platform and software image support. To access Cisco Feature Navigator, go to https://cfnng.cisco.com/.