Why cannot OSPF inter-area route summarization take effect

According to RFC 2328, the inter-area Type-3 link-state advertisements (LSAs) generated by an Area Border Router (ABR) are directly processed into corresponding Type-3 LSAs regardless of the configured range. Summarization configuration is considered only in the case of intra-area routes.

Such route aggregation, even if achieved, causes more LSAs to be advertised to the backbone area, making the network unstable.

Scroll to top