Re: BGP Reverse Path Selection

Here is a good link to start when looking at options that ISP support in
regards of manipulating BGP polices with communities.

http://www.onesc.net/communities/

Your ISP might be listed there and you could see what type of option they
might support.

Regards,

Tom

On Mon, Mar 26, 2012 at 12:31 AM, Joe Astorino <joeastorino1982_at_gmail.com>wrote:

> Perhaps you could talk to your providers about their support of various BGP
> community values to influence path selection. Some providers already have
> predefined community values that you can send to do that sort of thing. It
> might be worth a try if you don't want to do AS prepending. Jesus & Pals
> idea is a good one too
>
> On Mon, Mar 26, 2012 at 1:28 AM, jesus And Pals <jesusnpals_at_gmail.com
> >wrote:
>
> > On Mon, Mar 26, 2012 at 12:27 AM, jesus And Pals <jesusnpals_at_gmail.com
> > >wrote:
> >
> > > Hi ,
> > >
> > > We have a similar setup in our company , we generally advertise equal
> > > blocks on both providers .
> > >
> > > Every once in a while we come up with a situation where we would like
> to
> > > influence traffic on the fly .
> > > We have tried AS- Path prepend and run into complications ever so
> often,
> > > maybe it was just how we were doing it i guess . ( on Juniper's )
> > > But my point is we devised a simpler way to do it ..which guaranteed
> that
> > > we could influence the path easily .
> > > This will only work if you are advertising big blocks which i assume u
> > are
> > > .
> > >
> > > Let us suppose we advertised 2 blocks out Carrier A and Carrier B (
> both
> > > /19 )
> > > So the carrier u want to be preferred for the reverse path , Just break
> > > the /19 into two /20 routes .
> > > So since u have a more specific route out there in the Internet with
> new
> > > /20 its is the preferred inbound route for traffic .
> > >
> > > Hope this helps .
> > > -ty
> > >
> > > On Mon, Mar 26, 2012 at 12:00 AM, Saravanan Ponnaiah <
> > > saravanan.ponnaiah8_at_gmail.com> wrote:
> > >
> > >> Dear Expert,
> > >>
> > >> My network is having a two EBGP links with Different providers, I want
> > to
> > >> manipulate the Reverse traffic via one provider & forward via another
> > >> provider. Is any other way to manipulate the EBGP reverse path
> traffic
> > >> other than AS PATH Attribute
> > >>
> > >> With Regards
> > >>
> > >> P.Saravanan
> > >>
> > >>
> > >> Blogs and organic groups at http://www.ccie.net
> > >>
> > >>
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> >
> >
> >
> >
> >
> >
> >
>
>
> --
> Regards,
>
> Joe Astorino
> CCIE #24347
> http://astorinonetworks.com
>
> "He not busy being born is busy dying" - Dylan
>
>
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>
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Received on Mon Mar 26 2012 - 00:44:33 ART