The MPLS WG Archive

["David Allan" <dallan@nortelnetworks.com>]

Title: RE: [Fwd: I-D ACTION:draft-pan-rsvp-te-restart-01.txt]

Ping:

I'm having trouble correlating route flap instability data with your problem statement. Similarly I have trouble with the analogy between graceful restart for routing (which has a fair chasm between it and forwarding) and a soft state signalling protocol which would appear to require a much tighter coupling.

Is this really more applicable to GMPLS and should be tagged as such?

rgds
Dave

-----Original Message-----
From: Ping Pan [mailto:pingpan@juniper.net]
Sent: Wednesday, August 15, 2001 9:34 AM
To: neil.2.harrison@bt.com
Cc: mpls@UU.NET
Subject: Re: [Fwd: I-D ACTION:draft-pan-rsvp-te-restart-01.txt]

neil.2.harrison@bt.com wrote:
>
> Ping,
>
> Can you please explain (i) what causes such RSVP nodal re-starts in the 1st
> place

Neil,

The same cause why routing engine may fail in the network, while data
forwarding is fine. The graceful restart technique is not new, as being
define for IGP and BGP already.

> and (ii) how frequently you see them per reason (I assume they must be
> of some concern to have written this ID)?
>

If you believe the data collected at
http://www.merit.edu/ipma/instability/, network does run into instable
conditions. Our draft is to localize the problem when that happens.

- Ping