[110178] in North American Network Operators' Group
Re: IPv6: IS-IS or OSPFv3
daemon@ATHENA.MIT.EDU (Mark Tinka)
Sun Dec 28 00:01:04 2008
From: Mark Tinka <mtinka@globaltransit.net>
To: Randy Bush <randy@psg.com>
Date: Sun, 28 Dec 2008 13:00:28 +0800
In-Reply-To: <49562D29.8030003@psg.com>
Cc: nanog@nanog.org
Reply-To: mtinka@globaltransit.net
Errors-To: nanog-bounces@nanog.org
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On Saturday 27 December 2008 09:27:05 pm Randy Bush wrote:
> as one who has been burned when topologies are not
> congruent, i gotta ask. if i do not anticipate v4 and v6
> having different topologies, and all my devices are
> dual-capable, would you still recommend mt for other than
> future-proofing?
In practice, we realized that enabling IS-ISv6 on interfaces=20
already running IS-ISv4 was problematic without MT pre-
configured.
Those links surely lost IS-IS adjacency which threatened=20
stability of the network.
Things could probably have been easier if all routers=20
accepted all transition commands at the same time (or if all=20
routers were pre-configured and powered on at the same=20
time), but that's not possible.=20
MT allowed us to bring up individual v6 links on the same=20
and different routers, at different times, without bringing=20
down the v4 network, considering that several routers had as=20
many as 4 - 6 links into the core.
Cheers,
Mark.
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