Re: Graceful Restart

[John Smith <[e-mail]>]

Krishna,
my 2 euros (dollars are out !!!)

>
> draft-ietf-ospf-hitless-restart-07.txt:
> 2.  Operation of restarting router:
>
> Point 2) If the restarting router determines that it was
> Designated
>           Router on a given segment immediately prior to the
> restart,
>           it elects itself as Designated Router again
>
> Q1)Why does this need to be done while restarting?
>     AND
>     How does it help ??

Its helps in maintaining sanity in the network. Others think that this router is still up
and continue trusting him as DR. When he comes up he should not break this trust and
should ideally start operating as a DR.

The basic concept is that if he resigns from DRship then the BDR will take over and they
will need to again re-elect the BDR .. which is a messy affair. The whole point of
graceful restart is to avoid such events !!

>
> Q2)What if normal DR/BDR election takes place "on exiting
>     graceful restart"

Why do you want to land in this mess? You will again need to re-issue your LSAs, etc.
Everybody will have to re-synch .. and the whole purpose of graceful restart will be
defeated.

Others more informed about this protocol can correct me whatever i missed out!

JS



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