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Knowledge Base

How to marge two IS-IS router into one

Publication Date:  2012-07-25  |   Views:  2  |   Downloads:  0  |   Author:  Chowdhury Rahman (C00738260)  |   Document ID:  EKB0000576785

Contents

Issue Description

Let us consider the attached scenario where there are two routers namely CLNS-AR2810-(Uday) and AR2810-(Uday) running IS-IS over CLNS. And we have to merge two devices in to one router.

Alarm Information

If we use dis cur in both the device and focus on the IS-IS configuration part we will have the following config.

Router 1

#
 clns enable
 clns net 39.250f.8000.0000.0000.0001.0001.0010.0016.0003.00
 clns net 39.250f.8000.0001.0000.0001.0001.0010.0016.0003.00
#

#
isis area0
 network-entity 39.250f.8000.0000.0000.0001.0001.0010.0016.0003.00
 network-entity 39.250f.8000.0001.0000.0001.0001.0010.0016.0003.00
#





Router 1

#
 clns enable
 clns net 39.246f.0000.0116.0000.0001.0025.1065.1129.0000.00
#

#
isis NSN_DCN
 network-entity 39.246f.0000.0116.0000.0001.0025.1065.1129.0000.00
#


Handling Process

We can replace the two router with one and configure it like the following.

clns enable
clns net 39.250f.8000.0000.0000.0001.0001.0010.0016.0003.00
clns net 39.250f.8000.0001.0000.0001.0001.0010.0016.0003.00
clns net 39.246f.0000.0116.0000.0001.0025.0010.0016.0003.00

isis area0
network-entity 39.250f.8000.0000.0000.0001.0001.0010.0016.0003.00
network-entity 39.250f.8000.0001.0000.0001.0001.0010.0016.0003.00
network-entity 39.246f.0000.0116.0000.0001.0025.0010.0016.0003.00


Root Cause

To achive the goal we have to keep the Router ID in IS-IS same and have Area number different. So if we take a sample NET address.

AA.AAAA.AAAA.AAAA.AAAA.AAAA.AAAA.RRRR.RRRR.RRRR.00

Here AAA represents the area part and RRR represents the Router ID part.

In order for us to config the multiple NET address in the same router we have to keep the Router ID part same.

Suggestions

The only thing to take note is that we can configure upto 4 NET address in the same router and the router will negociate either L1 or L1/L2 role as required to peer with the other devices.