RE: IS-IS route leaking question

From: Scott, Tyson C (tyson.scott@hp.com)
Date: Thu Apr 01 2004 - 20:43:54 GMT-3


David,
It is the old way of doing prefix lists

Acc 100 permit host 172.16.4.0 host 255.255.255.0
Is the same as:
Ip prefix-list TEST 172.16.4.0/24

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
David Hurtado
Sent: Thursday, April 01, 2004 10:09 AM
To: ccielab@groupstudy.com
Subject: IS-IS route leaking question

Hello everybody,

When configuring IS-IS route leaking you need to use the following
command:

redistribute isis ip level-2 into level-1 distribute-list <100-199>

and an extended IP ACL.

In this extended IP ACL you establish:

Source address: route to be redistributed from Level-2 to Level-1

Destination address: ??????

I have reviewed the following link looking for an answer:

http://www.cisco.com/en/US/tech/tk365/tk381/technologies_tech_note09186a
0080093f39.shtml

but it doesn't offer any example. IE workbook uses "host 255.255.255.0"
as a
destination and it works. I have also tried "any" as destination address
and
it works too for the topology i'm working on. If i try a random network
address it doesn't work, so the destination address should be relevant.

What i want to know is:

1- Which is the purpose of the destination address in the ACL?

2- Why using 255.255.255.0 as destination address the route leaking
works?

Thanks for the help



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