[j-nsp] BGP peer's

Gregory Agerba gregory.agerba at gmail.com
Wed Jan 13 12:10:00 EST 2010


Accepting the idea that you are having twice the same ISP on two different
session but at the same location for redundancy purposes only, you definetly
wants to have:

1. Local preference set to a higher value on your primary link.
2. Preprend 3 times with your own AS the IN/OUT paths
This way, you have two links always up and running, but you always use the
primary and if you preprend it 3 times on the OUT direction, it is really
really unlikely that someone will prefer your worst .
Additionaly, if your primary session (-link) goes down, the BGP session will
flap and the second route will become the new *best* route (as the other one
will simply disapear) and your traffic will flow thru your second session
(-link) and this will revert when your main session (-link) will come back
to working state.
 -- Gregory
2010/1/13 Onam Rubio <onamrubio at hotmail.com>

>
> In my country are 5 ISP and to save internet traffic we make local BGP
> peering.
> Before this I have a BGP session for internet redundancy with one of the 5
> ISP's.
>
>
> > From: sfouant at shortestpathfirst.net
> > To: onamrubio at hotmail.com; juniper-nsp at puck.nether.net
> > Subject: RE: [j-nsp] BGP peer's
> > Date: Wed, 13 Jan 2010 10:41:37 -0500
> >
> > > -----Original Message-----
> > > From: juniper-nsp-bounces at puck.nether.net [mailto:juniper-nsp-
> > > bounces at puck.nether.net] On Behalf Of Onam Rubio
> > > Sent: Wednesday, January 13, 2010 10:27 AM
> > >
> > > I have 2 BGP session with the same ISP but one of this  one is for the
> > > local BGP to save internet traffic, and the other one is for internet
> > > redundancy I need to have but session running but my advertisement goes
> > > for both of them to internet. Manually y can reject the networks to my
> > > uptream providers, Is there a way to do it automatically?
> >
> > I'm not sure I fully understand your question.  Are you saying you only
> want
> > to advertise routes to the Primary BGP peer, and only advertise routes to
> > the Secondary in the event of a failure of the Primary peer?
> >
> > Stefan Fouant, CISSP, JNCIE-M/T
> > www.shortestpathfirst.net
> > GPG Key ID: 0xB5E3803D
> >
>
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