From: Tarun Pahuja (pahujat@gmail.com)
Date: Sun Nov 11 2007 - 12:17:12 ART
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.
Both protocols scale very well, have similar features. ISIS has some fast
convergence features as well as "advertise passive-only" to reduce
the number of routes in your IGP. In My Experience people shy away from ISIS
because of lack of knowledge for it. It is true a very FUN Protocol ;-)
The equivalent of Area 0(ospf) in isis is backbone area which runs L2.
The equivalent of ABR(ospf) in isis is a router running L1/L2.
The equivalent of area router(ospf) in isis are routers running only L1.
By default L1 routers only get a default route from L1/L2 routers,but you
can always redistribute L2 into L1 if you want full routes.
These definitions are very generalized comparison between the two
protocols. I have given you a 50,000 feet view of similarities between the
two ;-)
Couple of Links I would recommend:
www.nanog.org/mtg-0202/ppt/isis.ppt
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120t/120t5/ismarea.htm
http://www.cisco.com/warp/public/97/route-leak.html
Also search ciscopress on books on ISIS.
HTH,
Tarun
HTH,
Tarun
On Nov 11, 2007 9:25 AM, Pete Templin <petelists@templin.org> wrote:
> Dishan Gamage wrote:
> > Dear group
> >
> > can you pls help me in sharing your thoughts on best method to migrate
> > a multi-area OSPF network to
> > ISIS ??
>
> http://www.nanog.org/mtg-0310/gill.html
>
> Worked 100% for me.
>
> pt
>
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