RE: Connecting ISIS Level-1 Router To Multiple Level-1-2 in

All you need to do is configure multiple NET addresses so that the L1 router is in the same area as all its L1/L2 routers.

Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan_at_INE.com
 
Internetwork Expert, Inc.
http://www.INE.com

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Edmore Chingwena
Sent: Monday, October 01, 2012 10:18 AM
To: groupstudy
Subject: Connecting ISIS Level-1 Router To Multiple Level-1-2 in different Areas

Hi Experts

I have a question I wish to check. What will be the best way to connect a
Level-1 router to Multiple Level-1-2 routers in different IS-IS areas.
Defaultly this not possible but wish to check if anyone has used some stupid router tricks to get this to work or there is an RFC or draft.
Something I have tested is using multiple processes and redistributing on one of the L1/2 routers at one point with a route-policy.

Redistribution will be last resort wanted to check if there are any other alterves in a multivendor environment where the L1 router is most likely not cisco and 90% chance that one of the L1/L2 is also not Cisco.

Example

R1 is L1 R2 is L1/2 and R3 is L1/2

R1 is hard-coded as L1 connects to R2 and R3 and is running IS-IS Level-1 to the two

Example Area design

 R1 49.0001.0100.0000.1111.00
 R2 49.0001.0100.0000.2222.00
 R3 49.0003.0100.0000.3333.00

The requirements I have are the same as what Cisco calls multi-area ISIS but seems not to work with some of the codes I have in my current environment in a test environment as well.

Regards
Edmore Chingwena
CCIE#36714 SP

Blogs and organic groups at http://www.ccie.net
Received on Mon Oct 01 2012 - 11:56:03 ART