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:
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Enables privileged EXEC mode.
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Step 2 |
configure terminal Example:
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Enters global configuration mode. |
Step 3 |
router ospfv3 process-id Example:
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Enables OSPFv3 router configuration mode. |
Step 4 |
address-family ipv6 unicast Example:
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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:
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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:
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Exits address family configuration mode and returns to privileged EXEC mode. |
Step 7 |
show ospfv3 [process-id ] max-metric Example:
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Displays OSPFv3 maximum metric origination information. |
Configuration Examples for OSPFv3 Max-Metric Router LSA
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 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.
Releases |
Feature Information |
---|---|
Cisco IOS XE Fuji 16.8.1a |
The feature was introduced. |