[c-nsp] which IGRP?

[Tantsura, Jeff]

Jeff,

I'd say that flat IS-IS (L2 only) or single area OSPF will work just fine
for you.
If you are not familiar with ISIS I'd propose to use OSPF.

In nowadays both protocols have a same features set, though ISIS due to TLV
format is easier extendable  so Cisco usually implements new features in
ISIS first but I don't think it's of big interest for you. 

Jeff

-----Original Message-----
From: Vincent De Keyzer [mailto:vincent at dekeyzer.net]
Sent: Friday, July 15, 2005 2:12 PM
To: cisco-nsp at jeffchan.com
Cc: cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] which IGRP?


Jeff,

I think your question fits the scope of this list, so in my opinion it
deserves an answer - unfortunately I am not an IGP expert. All I can tell
you is that we are also running a small ISP network, and happily using OSPF.
You probably know that EIGRP is Cisco proprietary; another choice is IS-IS
which I know very little about (but have heard good things of).

I respectfully hope that people on the "higher end" of this list will
correct or complete me :)

Vincent


> This should all be covered in fairly entry-level Cisco documentation. Try
> looking at the CCNA libraries - this list is a little on the high end.
>
>
>
> cisco-nsp at jeffchan.com@puck.nether.net - 15/07/2005 12:02
> 
> Please respond to cisco-nsp at jeffchan.com
> Sent by:        cisco-nsp-bounces at puck.nether.net
> 
> To:     cisco-nsp
> cc:
> Subject:        [c-nsp] which IGRP?
> 
> 
> We're finally adding a third and possibly fourth router to our
> small network, and I'm asking for suggestions about which IGRP to
> run.  We currently have a 7513/RSP4 as our main router.  It has
> our two upstream connections.  We also have a 3640 at a public
> peering point hearing routes from a few peers there and
> announcing ours to them.  We're using iBGP between the 3640 and
> 7513, but with a third router, which we would be migrating one
> uplink to, it seems we'd need to fully mesh and/or set up a route
> reflector if we wanted to continue to use iBGP as our interior
> protocol.
> 
> Instead of iBGP, should we use a routing protocol optimized
> specifically for interior use such as EIGRP, OSPF, etc.?
> Or can it be done satisfactorily with iBGP and a route reflector
> setup?  (Naturally we're talking eBGP to our external peers.)
> 
> Is there a standard practice for this?   IOS is 12.3(13)
> mainline everywhere.
> 
> Jeff C.

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