Unanswered Question
Jul 29th, 2008

Hi guiys, preparing for ICND2 and going over OSPF. I can see a reference that states a DR and BDR exist in each area to ensure LSAs are sent by a DR so the network is not flooded, and that other routers not assigned either role are listed as DROTHER. If I run sh ip ospf neighbors I get this:

Accessserver#sh ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface 1 FULL/DR 00:00:34 Ethernet0 0 FULL/ - 00:00:31 Serial0

Note that 10.0.06 is listed as FULL/ but no role. Why does this happen?


I have this problem too.
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ross_rulz Tue, 07/29/2008 - 23:00

It means that the link is a point to point link and there is no election as there is only 2 hosts on that link.



Richard Burts Thu, 07/31/2008 - 12:54


I agree with Ross that it is the result of being on a point to point serial link and that there is no DR/BDR election on point to point serial links.

Also, you seem to think that DR/BDR is per area but this is not true (and is a common misunderstanding). A DR and perhaps a BDR are elected per multiaccess segment (in general per subnet). So if an OSPF area had 6 Ethernet subnets in it we would expect to find 6 DRs within that area.




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