Re: [OSPF] OSPF GR query
Acee Lindem <acee@cisco.com> Thu, 05 October 2006 15:11 UTC
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Date: Thu, 05 Oct 2006 11:10:33 -0400
From: Acee Lindem <acee@cisco.com>
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To: Khan Amir-G20247 <amirkhan@motorola.com>
Subject: Re: [OSPF] OSPF GR query
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Khan Amir-G20247 wrote: > Hi Ace > > But reaching to a FULL state is not one of the conditions for Helper to > quit Helper mode, I guess a Helper who has reached > to FULL state with its restarting router will wait for Grace LSAs to be > flushed or GR timeout to happen for exiting Helper mode. > No - The presumption is when you reach FULL state you don't need to "quit" helping - you have "finished" helping. Over the years, there have been a few situations that could have been better documented - however, this never caused any confusion in the past. Thanks, Acee > Regards > Aamir > > > -----Original Message----- > From: Acee Lindem [mailto:acee@cisco.com] > Sent: Thursday, October 05, 2006 8:00 PM > To: Khan Amir-G20247 > Cc: ospf@ietf.org > Subject: Re: [OSPF] OSPF GR query > > Hello Amir, > > Khan Amir-G20247 wrote: > >> >> >> Hi >> >> I have query related to OSPF Graceful Restart. >> >> Consider this scenario: >> >> >> >> - Three Routers R1, R2 and R3 connected via Broadcast networks. >> >> >> >> >> >> >> >> - Where R1 is a DR on both the segments, where as R2 and R3 are in >> DR-other >> - Now R1 wants to perform GR, R2 and R3 agrees to be its Helpers. >> - Now after restart R1 will try to form adjacency with both R2 and R3. >> > > >> - Lets say R1 and R2 had become FULL, while R1 and R3 had reached >> Exstart state. Now at this time R2 receives an LSA (any type 1-5 and >> 7, from some other router existing in the same area, not pictured >> here) which he needs to flood to R1. >> - This will force R2 to quit Helper Status, while R1 and R3 are still >> in process of forming adjacency. >> >> > Since he has reached FULL state, he is no longer a helper router. > >> Considering above scenario, my doubts are: >> >> - How will R1 come to know that its Helper R2 has quit? >> >> > Since he has reached FULL state, he is no longer a helper router. > >> - Will the adjacency between R1 and R2 needs to go down, as R2 quits >> helper mode? >> >> > No > >> - Will this effect the adjacency formation of R1 and R3? >> >> > No. R3 MAY exit helper status and re-originate a new router LSA if he > receives the new LSA before reaching FULL state with R1 AND he is has > strict-LSA-checking configured. > > Hope this helps, > Acee > >> >> >> Regards >> Aamir >> >> >> >> >> >> ---------------------------------------------------------------------- >> -- >> >> _______________________________________________ >> OSPF mailing list >> OSPF@ietf.org >> https://www1.ietf.org/mailman/listinfo/ospf >> >> > > _______________________________________________ OSPF mailing list OSPF@ietf.org https://www1.ietf.org/mailman/listinfo/ospf
- [OSPF] OSPF GR query Khan Amir-G20247
- RE: [OSPF] OSPF GR query Don Goodspeed
- Re: [OSPF] OSPF GR query Acee Lindem
- [OSPF] OSPF GR query Khan Amir-G20247
- Re: [OSPF] OSPF GR query Acee Lindem
- RE: [OSPF] OSPF GR query Khan Amir-G20247
- Re: [OSPF] OSPF GR query Acee Lindem
- Re: [OSPF] OSPF GR query sujay gupta
- [OSPF] OSPF GR query Khan Amir-G20247
- Re: [OSPF] OSPF GR query Abhay D.S
- Re: [OSPF] OSPF GR query sujay gupta
- Re: [OSPF] OSPF GR query Vivek Dubey
- Re: [OSPF] OSPF GR query Abhay D.S
- Re: [OSPF] OSPF GR query Vivek Dubey
- Re: [OSPF] OSPF GR query Acee Lindem
- Re: [OSPF] OSPF GR query Abhay D.S
- Re: [OSPF] OSPF GR query sujay gupta
- Re: [OSPF] OSPF GR query Acee Lindem