Re: BGP and AS loop prevention

Could u plz post the cnfig. and the sh ip bgp on the AS200 router?

On Tue, Oct 20, 2009 at 8:42 AM, Nate Lee <natetlee_at_gmail.com> wrote:

> I have a scenario labbed up where I have an discontiguous BGP AS split by
> another AS, something like this: (AS100) <> (AS 200) <> (AS 100).
>
> I am trying to get the prefixes on the AS 100 routers to show up in each
> others BGP tables. I have implemented the neighbor x.x.x.x allowas-in
> command on the AS 100 routers on their neighbor statements facing the AS
> 200
> routers but it does not seem to work. When I do a SHOW IP BGP NEIGH
> x.x.x.x
> ADVERTISED-ROUTES on the AS 200 routers, I see that the AS 200 router will
> not send the route that originated in the far side AS 100.
>
> Is there some sort of configuration needed on the AS 200 routers to allow
> them to send a route with an AS PATH that contains the AS they are sending
> into? I was under the impression that they do not perform an outgoing AS
> PATH check.
>
> Thanks!
>
> Nate
>
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