OSPF understanding

Hi GS,

working with OSPF HUB and spoke, R5 being hub, R1 - R4 being spokes (using
non-broadcast network type, all routers using physical interfaces). Spokes
dont have direct frame-relay mappings with each other, but through hub. Made
some experimental changes in this way.

1- make R5 DR by using priority
2- R1-R3 set ip ospf priority 0
3- R4 set priority lower than R5 but non 0.

R5 becomes DR and R4 BDR, every thing works fine, other three spokes get R5
as DR.

Now cleared the R5 OSPF Process and R4 Become DR and R5 elected as BDR.
Vriefied both on R4 and R5 by show ip ospf int command.

BUT , other three spokes, R1-3 are still identifying R5 ad DR. Why? As for
as i know, DR/BDR is proprty of interface not router. When R5 is BDR with R4
on same interface then how come it can be DR for other routers on same
interface?
Interestingly, Database identifies correct DR, but show ip ospf neighour
command don't reflect it correctly.

Any input will be of great value.

Best Regards,

Nadeem Rafi

Blogs and organic groups at http://www.ccie.net
Received on Thu Feb 11 2010 - 22:49:23 ART