At 3:38 PM +0000 2/26/03, Steven Aiello wrote:
>Hello All,
>
> I'm wondering was IS-IS is. No pun intended.
Don't be scared of punning in this context. A T-shirt frequently
seen at IETF (home of OSPF) meetings read:
IS - IS = 0
Both ISIS and OSPF are link state routing protocols, with many
high-level similarities and many low-level different assumptions. In
general, OSPF is less processor efficient, but gives more traffic
control than basic ISIS and tends to be more attractive in
enterprises. ISIS gives more stable simple networks and often is
more attractive for service providers.
A lot of this has historical and political flavor. Both protocols are
standard and work well, but have tended to become optimized for
different environments--although you could certainly run ISIS in an
enterprise and OSPF as an ISP IGP.
> I'm assuming it's a
>routing protocol? I've gone through Cisco, CCNA acad. and have my CCNA
>and I've even started going over Semester 5 for the CCNP, but IS-IS is
>no where to be found... Is this a new protocol?
Actually, it's slightly older than OSPF, having evolved from the
routing protocol in DECnet Phase V, and then the OSI protocol (as
distinct from model) world. OSPF started out in the IP world. Again,
these are more historical differences than anything else -- OSI
protocols are rarely if ever used, although the good features of them
have been incorporated into IP protocols. IPv6 is much more OSI-ish
than IPv4.
>Or does someone know
>where I can find a good over view?
>
>Thanks for brain food,
>Steve
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=63893&t=63875
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