Although stub areas conserve resources within non-backbone areas by preventing certain LSAs from entering, these areas do nothing to conserve resources on the backbone. All addresses within an area are still advertised out to the backbone. This situation is where address summarization can help.
The Cisco OSPF can perform two types of address summarization: inter-area summarization and external route summarization.
Inter-area summarization
- Is the summarization of addresses between areas; this type of summarization is always configured on ABRs.
- Configure
- (config-router)#area 15 range 10.0.0.0 255.248.0.0
- A route that pointing to int Null0 is created after configuring OSPF Summarization (i.e. same as EIGRP)
External route summarization allows a set of external addresses to be redistributed into an OSPF domain as a summary address and is configured on ASBRs
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