[c-nsp] IS-IS or OSPF as IGP?

[Gert Doering]

Hi,

On Tue, Apr 24, 2007 at 09:42:46AM +0800, Joe Shen wrote:
> And, to my knowledge, technical research on OSPF is
> more fertile than IS-IS, and new feature is introduced
> to OSPF eariler than IS-IS. 

Well - this is something opinions differ on, given that IPv6 could very
easily be added to IS-IS, while they had to do a completely new protocol
(OSPFv3) to be able to make it do IPv6...

I think IS-IS is more elegant due to the way it does v4 and v6 basically
in a single protocol, all in one go, and with OSPF you need to run two
routing instances mostly doing the same, but independently so - but
OTOH, IS-IS using OSI transport, which means "if your IP stack breaks,
your routing protocol might still happily assign reachability" (which
did happen to BT some years ago).

So in summary - use whatever you're familiar with, and what works for you.

gert
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de