[c-nsp] IPv6 Migration with ISIS (was Route Reflector Design)

[Vinny Abello]

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Leif Sawyer
> Sent: Thursday, July 03, 2008 2:29 PM
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Route Reflector Design
>
> Steinar Haug [sthaug at nethelp.no] writes in response to
> > Pete Templin [petelists at templin.org], whom  wrote:
> >> I'm now contemplating going back to OSPF.  The relevant reasons are:
> >>
> >> 1) We have some use for Catalyst 3550s in our network, and
> >>    AFAIK they don't speak ISIS.
> >> 2) We're having extreme pain trying to bring up ISIS for IPv6.
> >
> > I was wondering whether you could elaborate a bit more on the
> > second point? (Background: We have a Juniper based backbone,
> > with IS-IS and IPv6, and it "just works". Due to an upcoming
> > merger we are likely to have a mixed Juniper/Cisco backbone
> > in the not too distant future, and any info on problems with
> > IS-IS for IPv6 would be interesting.)
>
> Really?
>
> This is the basic configlet I applied to our routers -n-
> switches, ignoring any issues with the cef commands, of course.
> I haven't seen any issues at all with our roll-out.

While on this topic, if anyone has figured out a non-disruptive strategy to deploying IPv6 in a core with a mix of Cisco and Foundry routers running ISIS, any pointers would be appreciated. Foundry currently doesn't support multi-toplogy with ISIS which is the major stumbling block I've run into. Not using multi-toplogy support and ignoring the v6 TLV's with "no adjacency-check" still seems to cause problems and drop adjacencies. I've additionally looked into the "multi-topology transition" command but it hasn't provided a clear answer to me.

If we were all Cisco it looks like it's a piece of cake. I just can't find the magic combination with Cisco and Foundry... unless I disrupt my whole network to convert it to have both v4 and v6 TLV's in the single ISIS topology. Any pointers from anyone who has been down this path with these two vendors? It would be much appreciated. :)

-Vinny