The `show ospf database summary [area]` command tells you the summary of the link-state database (LSDB), you would need to infer from it which LSAs represent prefixes.
1. For example, you have Router LSAs, these LSAs will not only contain the topology information (nodes), but also the network-layer reach-ability information (NLRI), by looking at this command you won't be able to infer which routes are being advertised.
2. Summary LSAs will contain info for the inter-area prefixes, in this case you have 2 Summary LSAs, which means you have two inter-area advertisements.
3. NSSA LSAs means this area is holding type-7 LSA information, and these 6 NSSA LSAs were generated locally by redistribution of external prefix information (export policies somewhere in the NSSA), this means you have six prefixes that area NSSA.
4. External belong to the OSPF domain, and you have a total count of 10 External LSAs, which means 10 External prefixes.
If you want to know the details, you would need to expand it directly by the LSA type as in `show ospf database <LSA TYPE>` command.
Elvin
Original Message:
Sent: 03-13-2021 19:05
From: Unknown User
Subject: How can I quickly identify which prefixes are originated from an OSPF areas on an ABR ?