OSPF RFC

[Ratheesh mv]

What is the difference between OSPF1583compatibility and 1587compatibility ?

Thanks in advance 

[Georg Pauwen]

Hello,

--> RFC 1583 means that IOS maintains a single best route to an autonomous system (AS) boundary router in the OSPF routing table, rather than multiple intra-AS paths, if they are available.

--> RFC 1587 (which has actually bee obsoleted by RFC 3101) specifies the selection criteria for a new AS external path when compared to the ones present in the table (see link below)

https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/212608-ospf-external-path-selection-external-t.html