RE: Filter Routing updates with Prefix-List

From: Scott Morris (swm@emanon.com)
Date: Sun Nov 12 2006 - 16:20:32 ART


Because your prefix list is set to allow /22 and /23 routes. If you are
receiving /24's, they won't match.

Try:

ip prefix-list RED_RIP_ROUTES seq 5 permit 192.168.8.0/21 ge 24 le 24

See if that works better for you.

 
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
IPExpert VP - Curriculum Development
IPExpert Sr. Technical Instructor
smorris@ipexpert.com
http://www.ipexpert.com
 

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Udo
Sent: Sunday, November 12, 2006 12:45 PM
To: CCIE Groupstudy
Subject: Filter Routing updates with Prefix-List

Hi all,

I had the following test environment
R1---------R2--------R3
I would like to filter routing updates coming from R1 to R2
R1 and R2 are speaking RIP v2.On R1 are networks 192.168.10-20.0/24

Is it possible to filter with a prefix-listthe networks
192.168.12-14.0/24 ? I configure :

ip prefix-list RED_RIP_ROUTES seq 5 permit 192.168.8.0/21 ge 22 le 23

But when I apply this to the distribute-list command all routes are
denied...

Right now I'm not shure if I understand how prefix-list's are work

Thx

Udo

                



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