Summarizing Subnetwork Lsas On An Ospf Abr - Cisco ASR 9000 Series Routing Configuration Manual

Summarizing Subnetwork LSAs on an OSPF ABR

Check for lines:
Virtual Link OSPF_VL0 to router 10.0.0.3 is up
State is up and Adjacency State is FULL
Summarizing Subnetwork LSAs on an OSPF ABR
If you configured two or more subnetworks when you assigned your IP addresses to your interfaces, you
might want the software to summarize (aggregate) into a single LSA all of the subnetworks that the local area
advertises to another area. Such summarization would reduce the number of LSAs and thereby conserve
network resources. This summarization is known as interarea route summarization. It applies to routes from
within the autonomous system. It does not apply to external routes injected into OSPF by way of redistribution.
This task configures OSPF to summarize subnetworks into one LSA, by specifying that all subnetworks that
fall into a range are advertised together. This task is performed on an ABR only.
SUMMARY STEPS
1. configure
2. Do one of the following:
3. router-id { router-id }
4. area area-id
5. Do one of the following:
6. interface type interface-path-id
7. commit
DETAILED STEPS
Command or Action
Step 1 configure
Step 2 Do one of the following:
• router ospf process-name
• router ospfv3 process-name
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
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Adjacency State FULL (Hello suppressed)
• router ospf process-name
• router ospfv3 process-name
• range ip-address mask [ advertise | not-advertise ]
• range ipv6-prefix / prefix-length [ advertise | not-advertise ]
Purpose
Enables OSPF routing for the specified routing process and places
the router in router configuration mode.
or
Enables OSPFv3 routing for the specified routing process and places
the router in router ospfv3 configuration mode.
Implementing OSPF