From: ying chang (ying_c@xxxxxxxxxxx)
Date: Mon Apr 29 2002 - 01:16:26 GMT-3
How about ip prefix-list p1 permit 0.0.0.0/0 ge 24 le 24?
>From: "Jeff Szeto" <jytszeto@hotmail.com>
>Reply-To: "Jeff Szeto" <jytszeto@hotmail.com>
>To: <ccielab@groupstudy.com>
>Subject: Route filtering with extended access list
>Date: Mon, 29 Apr 2002 11:33:59 +0800
>
>Dear Group,
>
>R2-s0--------------------s1-R1
> RIP-172.16.28.0/24
>
>Originally, R1 is learning the following rip routes from R2
>R1#sh ip ro rip
> 172.16.0.0/16 is variably subnetted, 20 subnets, 6 masks
>R 172.16.184.0/22 [120/1] via 172.16.28.8, 00:00:02, Serial1
>R 172.16.180.0/25 [120/1] via 172.16.28.8, 00:00:02, Serial1
>R 172.16.181.0/26 [120/1] via 172.16.28.8, 00:00:02, Serial1
>R 172.16.182.0/27 [120/1] via 172.16.28.8, 00:00:02, Serial1
>R 172.16.181.64/28 [120/1] via 172.16.28.8, 00:00:02, Serial1
>R 172.16.60.0/24 [120/1] via 172.16.28.8, 00:00:02, Serial1
>R 172.16.8.0/24 [120/1] via 172.16.28.8, 00:00:02, Serial1
>R 172.16.90.0/24 [120/1] via 172.16.28.8, 00:00:02, Serial1
>R 172.16.70.0/24 [120/1] via 172.16.28.8, 00:00:02, Serial1
>
>I only want R1 to learn the routes with /24. I have tried the prefix list
>and
>it works
>R1#sh ip pre
>ip prefix-list p1: 2 entries
> seq 5 deny 172.16.0.0/16 le 23
> seq 10 permit 172.16.0.0/16 le 24
>
>But the extended access-list does not work,
>R1#sh ip access 104
>Extended IP access list 104
> permit ip 172.16.0.0 0.0.255.255 host 255.255.255.0
>
>Could anyone help me? Also, is the prefix list I used the shortest one?
>
>Thank you in advance.
>
>Jeff
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:58:21 GMT-3