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Re: Filter Routing updates with Prefix-List posted 11/13/2006
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hallo udo,

maybe you find this link usefull....

for me it was a real eye-opener for prefix-lists...

http://www.groupstudy.com/archives/ccielab/200310/msg01417.html


Viel Spass Gruesse

heiko


Udo schrieb:


Thanks Scott....

but what about when I like to match 192.168.13-16.0/24 ?
I think this is not possible to this with a one line prefix-list ?!


Udo




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@xxxxxxxxxxxx http://www.ipexpert.com



-----Original Message-----
From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] 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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