Chuck, I think this is a good question. I always looked for comparisons
between IS-IS and OSPF and never really could find any good source (I mean,
Doyle describe both protocols very well, but that's not what I'm looking
for, I'm looking for large implementation descriptions, explaining
problems/beneficts of using each one and experiences associated with it).
UUNet for example uses IS-IS on their core while the rest (or the majority)
of the ISPs use OSPF. I wonder why UUNet chosed for IS-IS instead of OSPF.
Maybe somebody on the list has an answer?
Today I would chose OSPF over IS-IS because:
- much more vendors support OSPF compared to IS-IS
- it's my perception that OSPF is the direction chosen by IETF, or at least
much more work is being done on OSPF than IS-IS
- OSPF is much more used than IS-IS, what makes easier to find people to
implement/support it
Any inputs on that?
Guilherme
-----Original Message-----
From: McCallum, Robert [mailto:[EMAIL PROTECTED]]
Sent: Thursday, November 16, 2000 9:03 AM
To: 'Chuck Church'; '[EMAIL PROTECTED]'
Subject: RE: IS-IS use??
Chuck, come on IS-IS is an "OPEN" standard. I am the total opposite to you
as to say I have no been without it in 2 companies that I have worked for.
As for when you should use it - to be honest I am hearing of more and more
businesses using it as people are starting to "think" that IS-IS is more
reliable than OSPF. It is less complicated and converges quicker than OSPF.
Of course it also has its downsides but it all comes down to where
everyone's skills set lie and at the moment it lies with OSPF. Me
personally LONG LIVE ISIS.
-----Original Message-----
From: Chuck Church [mailto:[EMAIL PROTECTED]]
Sent: 16 November 2000 13:45
To: '[EMAIL PROTECTED]'
Subject: IS-IS use??
All,
I'm just curious as to when and why you'd use IS-IS rather than OSPF or
EIGRP? I've never seen IS-IS in any business I've worked with or for in the
6 years I've been doing this. Do any other router manufacturers support it?
Is it eventually going to go away?
Thanks,
Chuck Church
CCNP, CCDP, MCNE, MCSE
Sr. Network Engineer
Magnacom Technologies
140 N. Rt. 303
Valley Cottage, NY 10989
845-267-4000 x218
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