External Routes Summarization in OSPF
External Routes Summarization in OSPF:
Consolidation of multiple routes into one single advertisement is called Route Summarization. In a nut shell, route summarization is the process of summarizing subnets into a larger subnet to be advertised to upstream routers for ease of management/troubleshooting and resource conservation.
There are two types of route summarization in OSPF.
1. Inter-Area Route Summarization
Although summarization could be configured between any two areas, it is better to summarize in the direction of the backbone. This way the backbone receives all the aggregate addresses and in turn will injects them, already summarized, into other areas.
Inter-Area route summarization can only be done on the Area Boarder Router (ABR) and summarize routes from one particular area into the another Area.
To specify an address range, perform the following task in router configuration mode:
area area-id range address mask
Where the “area-id” is the area containing networks to be summarized. The “address” and “mask” will specify the range of addresses to be summarized in one range.
2. External Route Summarization
External route summarization is specific to external routes that are injected into OSPF via redistribution.
Summarization is done via the following router ospf subcommand:
summary-address ip-address mask
This command is effective only on ASBRs doing redistribution into OSPF.
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