[c-nsp] Access list question

[Nsubuga Ronald]

Hullo,

On 10/31/07, Jefri Abdullah <jefri at grid.ui.edu> wrote:
>
> Dear List,
>
> I've two routers running ibgp as routing protocol, some how, one of
> these router should advertise network 0.0.0.0 (via default-information
> network statement) to another ebgp peer. But the ibgp peer should deny
> to receive this network.
>
> Trying this access-list but failed, because my router denying all
> route came from ibgp peer:
>
> Standard IP access list TEST
>     10 deny   0.0.0.0
>     20 permit any
>
> It's also impossible for me to permitting all prefix than at the end
> deny any, since the network advertised by ibgp is very large. Any
> other option to block prefix 0.0.0.0 but still receiving other prefix?



You can use prefix-lists which you can finally apply to the specified neighbor
you want to advertise specific prefixes.

format would be

ip prefix-list list-name deny/permit network/length

ip prefix-list no-more permit w.x.y.z/23
ip prefix-list no-more deny 0.0.0.0/0

This can be applied on both the advertised and received routes to your neighbor

by using neigh a.a.a.a prefix-list no-more in




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Ronnie Tash
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