From: Paul Cosgrove (paul.cosgrove@heanet.ie)
Date: Fri Apr 18 2008 - 03:51:30 ART
Hi Herbert,
What version of IOS are you using? It works ok in 12.4(16).
Router1(config)#router rip
Router1(config-router)#network 172.16.12.0
Router1(config-router)#version 2
Router1(config-router)#ip prefix-list NO-DEFAULT deny 0.0.0.0/0
*Apr 18 06:36:35.611: RIP: sending v2 update to 224.0.0.9 via
FastEthernet0/0.13 (172.16.13.1)
*Apr 18 06:36:35.611: RIP: build update entries
*Apr 18 06:36:35.611: 0.0.0.0/0 via 0.0.0.0, metric 1, tag 0
*Apr 18 06:36:35.611: 172.16.1.0/24 via 0.0.0.0, metric 1, tag 0
*Apr 18 06:36:35.611: 172.16.12.0/24 via 0.0.0.0, metric 1, tag 0
*Apr 18 06:36:35.611: 172.16.14.0/24 via 0.0.0.0, metric 1, tag 0
Router1(config-router)#distribute-list prefix NO-DEFAULT out
Router1(config-router)#
*Apr 18 06:36:42.163: RIP: Distribute-list changed: sending triggered update
*Apr 18 06:36:52.199: RIP: sending v2 update to 224.0.0.9 via Loopback0
(172.16.1.1)
*Apr 18 06:36:52.199: RIP: build update entries - suppressing null update
*Apr 18 06:36:54.527: RIP: sending v2 update to 224.0.0.9 via
FastEthernet0/0.12 (172.16.12.1)
*Apr 18 06:36:54.527: RIP: build update entries - suppressing null update
Router1(config-router)#
Router1(config)#ip prefix-list NO-DEFAULT seq 10 permit 0.0.0.0/0 le 32
Router1(config)#
*Apr 18 06:38:28.727: RIP: sending v2 update to 224.0.0.9 via
FastEthernet0/0.13 (172.16.13.1)
*Apr 18 06:38:28.727: RIP: build update entries
*Apr 18 06:38:28.727: 172.16.1.0/24 via 0.0.0.0, metric 1, tag 0
*Apr 18 06:38:28.727: 172.16.12.0/24 via 0.0.0.0, metric 1, tag 0
*Apr 18 06:38:28.727: 172.16.14.0/24 via 0.0.0.0, metric 1, tag 0
Router1#
Paul.
Herbert Maosa wrote:
> Looks like I still have a lot to learn about filtering using prefix lists. I
> am finding it unusual that
>
> - ip prefix-list DEFAULT_ONLY permit 0.0.0.0/0 will correctly filter
> out all routes and send only the default when used
> withdistribute-list prefix DEFAULT_ONLY out in
> RIP
> - ip prefix-list NO-DEFAULT deny 0.0.0.0/0 will NOT stop the default
> from being sent out when used with distribute-list prefix NO-DEFAULT out
> in RIP.
>
> Educate me here.
> I managed to stop the default from being sent out with
>
> - ip prefix-list THIS-WORKS permit 0.0.0.0/0 ge 1 when used with
> distribute-list
> prefix THIS-WORKS out in RIP
>
> Herbert.
>
>
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