From: nicky noname (cisco2study@gmail.com)
Date: Fri Aug 24 2007 - 12:02:21 ART
Thanks for your reply.
I want to advertise to the next AS (54), but no futher. So i want to pass
the route, with the community to both BB routers, where I would like the
community know export to stop the BB routers of AS54 from advertising on
again.
I think that by setting the community no-export on the routes that is
advertised locally, the community attribute is working on my local AS. So I
only want to set the community of no-export, as the routes are being
advertised to the BB routes of AS54. I am clear now....thanks anyhow.
nic
On 8/24/07, Toh Soon, Lim <tohsoon28@gmail.com> wrote:
>
> Hi nicky noname,
>
> I'm sorry I don't fully understand what you said.
>
> Anyway looking at your config and based on my understanding, R1 will
> install 150.12.66.0/24 into its BGP table and tag it with community of
> no-export. R1 will not advertise it to BB1. You don't even need the command
> "neighbor BB1 send-community".
>
> Over at R2, you can do "sh ip b com no-ex". You should see the
> 150.12.66.0/24 route. R2 will honor the no-export community by not
> advertising it to BB2. Again, you don't need the command "neighbor BB2
> send-community".
>
> Anyone any comments? Do correct me if I'm wrong. I have not labbed this
> scenario to confirm.
>
>
> Thank you.
>
> B.Rgds,
> Lim TS
>
>
> On 8/24/07, nicky noname <cisco2study@gmail.com> wrote:
>
> > Hello,
> >
> > I would very much appreciate some clarification.
> >
> > I have two routers in AS 2 that have two ebgp connections to backbone 1
> > and
> > 2 ( one each) in AS 54.
> >
> > We are to advertise network 150.12.66.0 mask 255.255.255.0 on one router
> > 1
> > in AS2.
> >
> > We do not want this network to be advertised past AS54.
> >
> > You can send the community attribute no-export to the backbones from R1
> > and
> > R2, via a route-map matching the network and setting the community and
> > then
> > sending the route-map to AS54.
> >
> > The questions is, can we not also, attach the community of no-export,
> > direct
> > to the network advertisement in BGP on R1, and then send the community
> > also
> > to R2 and to both Backbone 1 and 2, without specifically pushing a
> > route-map
> > out to the backbones ( just sending the community attribute) ?
> >
> > I have attached the later example...it would appear that the prefix will
> > not
> > leave the local AS?
> >
> >
> >
> >
> >
> > #################################
> > R1
> >
> > router bgp 2
> > no synchronization
> > bgp router-id xxxx
> > bgp log-neighbor-changes
> > neighbor R2 remote-as 2
> > neighbor R2 send-community
> > neighbor BB1 remote-as 54
> > neighbor BB1 send-community
> > network 150.12.66.0 mask 255.255.255.0 route-map no-export
> > no auto-summary
> > !
> > route-map no-export permit 10
> > set community no-export
> > !
> > ##########################
> > R2
> >
> >
> > router bgp 2
> > no synchronization
> > bgp router-id xxxx
> > bgp log-neighbor-changes
> > neighbor R1 remote-as 2
> > neighbor BB2 remote-as 54
> > neighbor BB2 send-community
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sat Sep 01 2007 - 11:32:13 ART