The Forwarding Address of Type 7-to-Type 5 LSAs

From: Toh Soon, Lim (tohsoon28@gmail.com)
Date: Thu Sep 13 2007 - 18:53:53 ART


Hi Group,

I have an ASBR in an NSSA. It is redistributing RIP into OSPF. I cover it's
loopback interface in the NSSA area. The ABR of the NSSA is not configured
to suppress the forwarding address when translating Type-7 to Type-5 LSAs.

Other routers in Area 0 see the redistributed routes having the Advertising
Router as the ABR's router-id and the Forward Address as the ASBR's loopback
ip.

When I remove the ASBR's loopback ip from the NSSA area, the Forward Address
becomes the ASBR's interface IP address out which it advertised the Type-7
LSAs.

Can anyone tell me what is the normal behavior OSPF determines the
forwarding address? Appreciate your comments.

Thank you.

B.Rgds,
Lim TS



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