From: Wes Stevens (wrsteve33-gssp@yahoo.com)
Date: Sun Nov 11 2007 - 16:07:32 ART
Pete, I have seen different guides as far as how may
routers in an L2 isis core. Some say 400 and I have
seen others say you can go up to 1200. Not sure how
big your network is or will grow - was this a
consideration? The type of router also comes into play
here.
Scott,
This is likely to come up in the DE practical. What is
your thoughts on how big a single L2 area can get?
--- Pete Templin <petelists@templin.org> wrote:
> Tarun Pahuja wrote:
> > Dishan,
> > There a lot of consideration a
> company has to make before
> > moving from one protocol or another. Since I do
> not know anything about
> > your network and the motivation behind moving to
> ISIS from OSPF. I can
> > only give you a couple of tips to get started
> thinking about a few
> > things. You will have to master ospf and isis in
> order to do the
> > migration(unless you want to get a consultant in).
> The size of the
> > network, link speeds, type of routers, etc would
> play a very important
> > role in migration phase as well as the overall
> final design.
>
> Honestly, I didn't have to learn much about ISIS to
> make the switch,
> though we did switch from multi-area OSPF to
> single-area ISIS (the areas
> weren't doing anything for us). The migration was
> incredibly seamless;
> I planned to roll one POP per night, almost for the
> fun of watching the
> migration go across the network. However, the only
> glitch we ran into
> was with MPLS Traffic Engineering: it's been a
> while, but I think TE
> only likes to have one TE-capable IGP in service.
> This forced us to
> make the switch in one night, which was no big deal
> anyway.
>
> > On Nov 11, 2007 9:25 AM, Pete Templin
> <petelists@templin.org
> > <mailto:petelists@templin.org>> wrote:
> >
> > http://www.nanog.org/mtg-0310/gill.html
>
> Again, this was all I needed. Granted, we were a
> service provider
> network with a topology much like ATDN (though with
> only five POPs).
> The basic premise is simple: roll out ISIS across
> the network, prefer
> ISIS across the network, remove OSPF across the
> network. Done.
>
> pt
>
>
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