Re: Waiting State Question

[Kishore Rao <[e-mail]>]

The question was not about how DR or BDRs are elected. John's question was
if the router should exit Wait Timer (and run DR election) on receving Hello
from a router declaring itself as DR. Well, from section 10.5 it should.

Kishore


> My guess is that if an interface comes out of the waiting state on
receiving a
> Hello from DR (without having received a Hello from BDR), it may elect
itself
> as BDR. This way many routers may elect themselves as BDR. Now all these
BDR
> claimants (except one) will ultimately take their claims to BDRship back
but in
> the process each router on the LAN may have to do several DR elections.
>
> Here is a paper we wrote recently that may shed further light on this:
> http://cs.uwm.edu/~mukul/ospflan.pdf
>
> Thanks,
> Mukul
>
> Quoting John Smith <[e-mail]>:
>
> > Hi,
> >
> > When a router comes up it starts the Wait Timer before it elects the
DR/BDR.
> > It either
> > waits for the Wait Timer to expire or it waits for a router declaring
itself
> > as the BDR
> > before it decides that it needs to get out of the 'Waiting' state (it
does
> > this by
> > generating the Backupseen event).
> >
> > My question is why does it wait only for the BDR? Why not the DR? It can
when
> > it recieves
> > a HELLO from the DR know that their exists a DR and a BDR. Why not then
get
> > out of the
> > 'Waiting' state?
> >
> > Thanks,
> > John
> >
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