From: Ben (bmunyao@gmail.com)
Date: Thu Sep 13 2007 - 04:54:57 ART
Carlos
Sorry for the misleading answer I gave earlier. As Scott pointed out, the
regex would not match neighboring AS only. Here are revised regex for the
two situations.
outgoing: ip as-path access-list 1 permit ^[0-9]*$
incoming: ip as-path access-list 1 permit ^200(_[0-9]+)?$
The above "outgoing" regex will match zero (locally generated) or one
(neighbor) AS only, while the "incoming" will match AS200 or AS200 and its
neighboring AS.
HTH
Ben
On 9/13/07, Rich Collins <nilsi2002@gmail.com> wrote:
>
> That looks good to me or you could be more specific and use the AS 200
> that
> you had in your first email. It might help with clarity when looking at
> the
> configuration.
>
> ip as-path access-list 1permit ^200+(_[0-9]+)?$
>
> On 9/12/07, Carlos Trujillo Jimenez <nergal888@hotmail.com> wrote:
> >
> >
> > what about this option applied inbound in routerB as a route-map or a
> > filter-list but applied inbound.
> >
> > ip as-path access-list 1permit ^[0-9]+(_[0-9]+)?$
> >
> > Is this ok??
> >
> >
> >
> >
> > >From: "Rich Collins" <nilsi2002@gmail.com>
> > >Reply-To: "Rich Collins" <nilsi2002@gmail.com>
> > >To: "Cisco certification" <ccielab@groupstudy.com>
> > >Subject: Fwd: bgp reg-exp for directly connected costumers
> > >Date: Wed, 12 Sep 2007 16:34:45 -0400
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> > >
> > >For action 1 what about ?:
> > >
> > >ip as-path access-list 1 permit ^[0-9]*$ (This covers routes generated
> > >from
> > >directly connected AS's and also locally generated prefixes.
> > >
> > >neighbor B.B.B.B filter-list 1 out
> > >
> > >Rich
> > >
> > >On 9/12/07, Carlos Trujillo Jimenez <nergal888@hotmail.com> wrote:
> > > >
> > > > Hi all.
> > > >
> > > > Im quite confused, please if someone helps me clarify, in the
> > following
> > > > scenario think both solutions will work.
> > > >
> > > > Scenario:
> > > >
> > > >
> >
> >
>
> >(AS500)ROUTERX---------------------(AS200)ROUTERA---------------------------
> ----ROUTERB(AS300)
> > > >
> > > >
> > > > ROUTERA is forming an EBGP peering relationship ith both ROUTERB and
> > > > ROUTERX.
> > > >
> > > > Action1. (configuration only in ROUTERA)
> > > > I want to RouterA send only its locally originated prefixes, as well
> > as
> > > > prefixes ORIGINATED from his directly connected cosumters to router
> B.
> > > >
> > > > ROUTERA:
> > > >
> > > > ip as-path access-list 1 permit ^200_[0-9]*$
> > > >
> > > > route-map ONLY-AS200-ANDCOSTUMERS
> > > > match as-path 1
> > > >
> > > > router bgp 200
> > > > neighbor ROUTERB route-map ONLY-AS200-COSTUMERS out
> > > >
> > > >
> > > > Action2.(configuration only in ROUTERB)
> > > > I want the same purpose as action 1 but only configuring it at
> > ROUTERB,
> > > > mean
> > > > only recibe prefixes originates by its neighbor routerA as 200, and
> > its
> > > > directly connected costumers
> > > >
> > > > ROUTERB:
> > > > ip as-path access-list 1 permit ^200_[0-9]*$
> > > >
> > > > route-map ONLY-AS200-ANDCOSTUMERS
> > > > match as-path 1
> > > >
> > > > router bgp 300
> > > > neighbor ROUTERA route-map ONLY-AS200-COSTUMERS in
> > > >
> > > > The as-path access-list is the same in both actions, but with the
> > route
> > > > map
> > > > apliedd in the first outbound, and in the second inbound,
> summarizing
> > in
> > > > the
> > > > sender applied outbound and in the receiber applied inbound.
> > > >
> > > > Please correct me if Im wrong with this one.
> > > >
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