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:[EMAIL PROTECTED]
Sent: Thursday, October 05, 2006 8:00 PM
To: Khan Amir-G20247
Cc: [email protected]
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
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