Route Summarization
Lesson 2: OSPF Route Summarization
OSPF allows summarization at both ABRs and ASBRs but not on other OSPF routers. The main reason is again that the LSDB must be the same for all routers in a single area. So, if summarization is needed, the summary prefixes should be created at the edge of an area (ABR or ASBR) and flooded throughout that area. However, the idea of summarizing on a router internal to an area, hoping that some routers in the area use the summary route and others in the same area do not, cannot be done with OSPF.
Good planning of route summaries can overcome the restriction of performing the summarization only ...
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