[j-nsp] BGP peer's

[Gregory Agerba]

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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