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.
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
- enable
- configure terminal
- router ospfv3 process-id
- address-family ipv6 unicast
- 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 ]]
- end
- show ospfv3 [process-id ] max-metric
DETAILED STEPS
Command or Action | Purpose | |
---|---|---|
Step 1 |
enable Example:
|
Enables privileged EXEC mode.
|
Step 2 |
configure terminal Example:
|
Enters global configuration mode. |
Step 3 |
router ospfv3 process-id Example:
|
Enables OSPFv3 router configuration mode. |
Step 4 |
address-family ipv6 unicast Example:
|
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:
|
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:
|
Exits address family configuration mode and returns to privileged EXEC mode. |
Step 7 |
show ospfv3 [process-id ] max-metric Example:
|
Displays OSPFv3 maximum metric origination information. |
Configuration Examples for OSPFv3 Max-Metric Router LSA
Example: Verifying 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 |
OSPFv3 Max-Metric Router LSA |
“OSPF Link-State Advertisement Throttling ” module |
Standards and RFCs
Standard/RFC |
Title |
---|---|
RFCs for IPv6 |
IPv6 RFCs |
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.
Feature Name |
Releases |
Feature Information |
---|---|---|
OSPFv3 Max-Metric Router LSA |
Cisco IOS XE Fuji 16.8.1a |
The OSPFv3 max-metric router LSA feature enables OSPF to advertise its locally generated router LSAs with a maximum metric. The feature was introduced. |