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Re: Router ISIS posted 04/25/2003
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ISIS was developed by ISO as part of the Connectionless Network Services (CLNS) suite, as was Connectionless Network Protocol (CLNP), the competition to IP.

However, ISIS is capable of running in an IP environment, so does not require CLNS routing.

Your bottom config is correct, except for one mistake. You DO need the clns map statement for ISIS over Frame Relay, but the map statement would not have an IP address (frame relay is a layer 2 protocol):

frame-relay clns 103 broadcast

You wouldn't need it on a point-to-point subinterface since that doesn't accept a map statement.

HTH, Kym

From: Eric Fisher <efisher@xxxxxxxxxxxxx>
Reply-To: Eric Fisher <efisher@xxxxxxxxxxxxx>
To: ccielab@xxxxxxxxxxxxxx
Subject: Router ISIS
Date: Fri, 25 Apr 2003 14:10:30 -0400

Do you need to enable clns routing to get ISIS to work. I have seen two types of configs and this is getting me a little confused.

clns routing
interface ser 1
encap frame
interface ser 1.1 point-to-point
ip address
ip router isis
clns router isis  <---is this needed.
frame-relay interface-dlci 103

router isis
net 49.0001.2222.2222.2222.00
is-type level-2

the above came from cisco

this config below came from a ccie class

interface ser 1
encap fram
ip add
ip router isis
fram map ip 103 broad
fram map clns 103 broad

router isis
network 49.0001.2222.2222.2222.00
is type level-2

what does the clns router isis command do, . and do you need to enable clns routing because the answer sheet I have from the class clns routing is not in there but the map statements are.


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