Troubleshooting OSPF Route Advertisement
This section discusses the problems related with OSPF route advertisement. OSPF is a link-state protocol. When it forms neighbor relationships, it exchanges the entire link-state database with its neighbor(s). If any database information is not shared with the neighbor, the link-state characteristics of OSPF will break.
The most common reasons for OSPF to not share the database information about a specific link are as follows:
• The OSPF neighbor is not advertising routes.
• The OSPF neighbor (ABR) is not advertising the summary route.
• The OSPF neighbor is not advertising external routes.
• The OSPF neighbor is not advertising the default route.
The sections that follow address these problems, the possible ...
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