Re: Waiting State Question
Erblichs <erblichs@EARTHLINK.NET> Fri, 20 May 2005 03:06 UTC
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Date: Thu, 19 May 2005 19:45:53 -0700
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From: Erblichs <erblichs@EARTHLINK.NET>
Subject: Re: Waiting State Question
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What is b/n them is broken? Combine areas and former entry/exit interfaces between the areas will result in two or more DRs announcements per pseudonode. This is taken care of in the Spec? Can anyone find the section? :-) Mitchell Erblich ------------------------- Kishore Rao wrote: > > > Second, "in the case where more than 1 router" > > is declaring itself as the DR, shouldn't enough > > time pass (1.5 to 2x) hello interval pass to identify > > this situation before exiting wait state and > > poss determine whether 2-ways are forming. Yes, > > it could/should exit early, but on that first > > hello??? > > A possible case of A & B declaring themselves as DR would be when comm. b/n > them is broken; in which case shouldn't router C prefer to elect itself as > BDR ASAP on receiving the hello from either A or B instead of waiting for a > longer period of time without the possiblity of neither A or B being elected > BDR during that time ? > > > > > Thus, this section of the spec covers the rare simple > > case where no BDR has yet been elected or is eligible > > to be elected. > > > > Mitchell Erblich > > ----------------- > > > > > > > > Kishore Rao wrote: > > > > > > 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