Re: BGP Reverse Path Selection

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
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>

-- 
Regards,
Joe Astorino
CCIE #24347
http://astorinonetworks.com
"He not busy being born is busy dying" - Dylan
Blogs and organic groups at http://www.ccie.net