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From: Li Zhong Jie (lzjCSNET1.CS.TSINGHUA.EDU.CN)
Date: Mon May 28 2001 - 04:37:42 CDT
Alex makes it clear, I'll give an example:
suppose two routers A and B, priority:A>B>0.
First, they run independently and select self as DR.
Then, They are connected to a common network.Consider what happens?
A will elect itself as DR and no BDR.
B lost its DR role in 1st iteration of the algo.,then goes on the 2nd iteration and elects itself as BDR.
A will elect B as BDR too.
----- Original Message -----
From: "Narendra" <nanarayaCISCO.COM>
Sent: Monday, May 28, 2001 3:27 PM
Subject: DR/BDR election
> I am new to OSPF and am currently reading RFC2328.
> I have some questions regarding the DR/BDR election (section 9.4 of
> (1) Why does the step (4) of the election process apply only to the router
> doing the calculation and not to other routers. Specifically, why do we
> disallow the calculating router from becoming both DR and BDR but allow some
> other router to become both DR/BDR ?
> (2) I can understand that steps (2) and (3) are required to be re-run when
> the calculating router becomes DR/BDR. But why are steps (2) and (3)
> required to be re-run when the calculating router is **no longer** a DR/BDR?
> Can someone please clarify.