From: Chuck Larrieu (chuck@xxxxxxxxxxxxx)
Date: Tue Feb 06 2001 - 01:28:33 GMT-3
Check out Doyle's chapter on ISIS for a reasonably clear explanation.
Slattery's chapter on ISIS is pretty good, but very little is said about the
addressing scheme. Ironically, Perlman's book is fairly useless for any real
information about ISIS.
Format AA.BBBB.CCCC.CCCC.CCCC.00
These are hex numbers.
AA is the AFI identifier. There are certain "registered" numbers apparently,
but none of the sources above specify. Doyle likes 47. Slattery likes 49.
BBBB is the area i.d.
The C's represent the system ID and must be unique in an ISIS domain.
Slattery recommends using a pneumonic based on a router's primary IP
address. This can get a little interesting if you have not practiced it. For
example, if a router's loopback is 124.17.100.5 Slattery would write this at
1240.1710.0005 ( yeah, I know. )
The last number is 00. If it is anything other than 00 then the rest of the
identifier is an NSAP address and must conform to NSAP rules ( no I don't
know what those are )
One other thing that takes a bit of getting used to. In the ISIS scheme of
things, routers are placed into areas. With OSPF, interfaces are placed into
areas. With EIGRP, IGRP, and RIP, networks are placed into the routing
processes, which may or may not include all or part of any router's set of
interfaces. This difference can be the source of a bit of confusion is
putting together labs and designs, until one has worked with it a bit.
HTH
Chuck
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of CCIE
yong
Sent: Monday, February 05, 2001 7:45 PM
To: ccielab@groupstudy.com
Subject: IS-IS Routing
Hi,
Wondering how to derive the network parameter under
"router ISIS
net xxx.xxx.xxx.xxx.xx.xx"
Sorry for bothering you guys,
Thanks
Yonger
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