Re: Waiting State Question
Kishore Rao <kishore@IND.ALCATEL.COM> Thu, 19 May 2005 19:11 UTC
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Message-ID: <075301c55ca6$26ce54b0$a328fb80@Kishorepc>
Date: Thu, 19 May 2005 13:08:32 -0600
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From: Kishore Rao <kishore@IND.ALCATEL.COM>
Subject: Re: Waiting State Question
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Not NeighborChange but Backupseen "If the neighbor is both declaring itself to be Designated Router (Hello Packet's Designated Router field = Neighbor IP address) and the Backup Designated Router field in the packet is equal to 0.0.0.0 and the receiving interface is in state Waiting, the receiving interface's state machine is scheduled with the event BackupSeen." > I think the NeighborChange events are ignored while an interface is in waiting > state. > > Thanks, > Mukul > > > Quoting Kishore Rao <kishore@IND.ALCATEL.COM>: > > > 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 <jsmith4112003@YAHOO.CO.UK>: > > > > > > > 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 > > > > > > > > Send instant messages to your online friends > > http://uk.messenger.yahoo.com > > > > > >
- Waiting State Question John Smith
- Re: Waiting State Question Anthony Baire
- Re: Waiting State Question Kishore Rao
- Re: Waiting State Question Mukul Goyal
- Re: Waiting State Question Erblichs
- Re: Waiting State Question Kishore Rao
- Re: Waiting State Question Mukul Goyal
- Re: Waiting State Question Kishore Rao
- Re: Waiting State Question Mukul Goyal
- Re: Waiting State Question Kishore Rao
- Re: Waiting State Question Erblichs
- Re: Waiting State Question Kishore Rao
- Re: Waiting State Question John Smith
- Re: Waiting State Question Erblichs
- Re: Waiting State Question Erblichs
- Re: Waiting State Question Mukul Goyal
- Re: Waiting State Question Kishore Rao
- Re: Waiting State Question Erblichs
- Exit-Graceful Restart Condition sujay
- Re: Exit-Graceful Restart Condition Padma Pillay-Esnault
- Re: Exit-Graceful Restart Condition Acee Lindem
- Re: Exit-Graceful Restart Condition Kishore Rao
- Re: Exit-Graceful Restart Condition Padma Pillay-Esnault
- Re: Exit-Graceful Restart Condition ashok holla
- Re: Exit-Graceful Restart Condition Padma Pillay-Esnault
- Re: Exit-Graceful Restart Condition Kishore Rao
- Re: Exit-Graceful Restart Condition Kishore Rao
- Re: Exit-Graceful Restart Condition Padma Pillay-Esnault
- Re: Exit-Graceful Restart Condition sujay
- Re: Exit-Graceful Restart Condition Acee Lindem
- Re: Exit-Graceful Restart Condition Padma Pillay-Esnault