Subject: RE: [Isis-wg] Route Leaking

From: "Paresh Khatri" <[email-masked]>
Date: Thu, 5 May 2005 12:34:38 +1000

Hi Sylvia,

ISIS will not even run between L1 and L2 since there is no common circuit-type between them.  You would have to make at least one of those an L1/L2 router or no ISIS adjacency between them will ever form.

Cheers,
Paresh.

-----Original Message-----
From: [email-masked] [mailto:[email-masked]]On
Behalf Of Sugar, Sylvia
Sent: Thursday, 05 May 2005 12:31 PM
To: [email-masked]
Subject: [Isis-wg] Route Leaking

Hi,

Please correct me if my understanding of the protocol is not correct.

A -- B ----- C ---- D
L1  L1/L2    L2     L1

A and B are in the same area, say X.
C and D are in a different area, say Y.

A and B have a L1 adjacency
B and C have an L2 adjacency
and C and D have an L1 adjacency

A has some routes with it, say 10/8 and 11/8. It advertises these routes to B in its L1 LSPs. B
would now advertise 10/8 and 11/8 in its L2 LSPs to C. Is this correct?

But only if route leaking from L2 to L1 is there will 10/8 and 11/8 figure in L1 LSPs issued by C
for D. By default, this will not happen.

Would appreciate if someone could confirm that my understanding of this matter is indeed correct.

Thanks,
Sylvia

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