From: Rolf (schaerer@gmail.com)
Date: Sun Mar 22 2009 - 09:38:50 ART
Hi Vignesh,
The forming of the IS-IS adjacency does not depend on the technology
like FR or ATM, it depends on the config of the is-is process on the
router (level command) and on the configured NET. The NET contains the
area and the sytem-id. In your case, the areas are defined the
following:
R1: 0001
R2: 0024
R4: 0024
R5: 0005
Between routers in different areas, only a L2 adjacency can be formed.
Between routers in the same area, a L1/L2 adjacency can be formed.
So, theory sais the following:
R1-R2: L2
R2-R4: L1/L2
R4-R5: L2
In your example, R2 sees R1 as a L1/L2 neighbor, but R1 sees R2 as a
L2 only neighbor...
same for R2/R4. That does not match your configuration. Have you
changed any parameters without clearing the process?
Hope that helps.
Yours,
Rolf
-- Rolf Schaerer CCIE #17218 (R&S/SP), CCDP Cisco Networking Academy of Eastern Switzerland http://cisco.netacad.chBlogs and organic groups at http://www.ccie.net
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