The reason there is a requirement in OSPF for an area zero is to avoid the
problems that all distance vector routing protocols suffer from. Both IS-IS
and OSPF route inter area traffic using distance vector "techniques".
For a fairly complete discussion on the merits of each check out Radia
Perman's Interconnections, Second Edition : Bridges, Routers, Switches,
and Internetworking Protocols
-Tom
At 11:45 AM 11/16/2000 -0500, you wrote:
>Guys,
>
>Sorry for jumping into this.
>
>I think I agree with Bob that IS-IS is more like something a service
>provider should consider.
>OSPF is sufficient for enterprise network, at least I think so, just imagine
>a network with 3000 or more routers, how could we design a OSPF network
>like this? how many routers do we want to put into area 0, I never had a
>chance to work with a network at this level, but would like to know how it
>works.
>
>IS-IS definitely has the ability to handle a network at this scale, it is
>more robust than OSPF.
>I think the reason that not too many people like IS-IS is that enterprise
>or small service providers really do not need IS-IS, OSPF is sufficient. If
>you do not work with it, you do not know it well, and you do not like a
>thing that you do not know well.
>
>Just my 2 cents
>
>Thanks
>
>Jack
>
>
>--
>
>""Spolidoro, Guilherme"" <[EMAIL PROTECTED]> wrote in message
>[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > 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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>
>
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__________________
Tom Holbrook
Network Engineer
Atlanta
Earthlink
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