[isp-bgp] Re: Multi-site BGP

[Rick Macchio <rmacchio@...]

Couldn't you use MEDS or prepending to force inbound traffic toward one
site vs. the other?  Or do you really need a conditional advertisement
to guarantee which path gets used in the inbound direction?

Thanks,
Rick Macchio

Michael Loftis wrote:
> 
> No you can't just advertise the other site through BGP, because then
> packets could get delivered to other site depending on if it had a better
> path or not...
> 
> What you can do is a conditional advertisement...Take a look at the
> archives for this list, I seem to remember it being discussed very recently.
> 
> --On Thursday, January 30, 2003 4:20 PM -0500 Rich Pulver
> <pulverr@...> wrote:
> 
> > Hello all. I have a question regarding BGP for Disaster Recovery. Does
> > anyone use BGP currently for fail over to a DR site? If so, is it as
> > simple as advertising my networks through providers in both locations and
> > configuring the primary site as the preferred until that site goes away?
> > (Or am I missing the fact that I won't be able to direct inbound traffic
> > to such a degree?)
> >
> > This is what I have
> >
> > site1 - NY - Primary - 2 x T3 - 3 Class C from 1 provider - ASN with ARIN
> >
> > site2 - CA - DR - 2 X T3
> >
> > I am already running BGP with two upstreams in NY. Can I just advertise my
> > routes and ASN in CA so all traffic will be redirected there if anything
> > happens in NY? Are there any ramifications to this type of setup? Any
> > input would be greatly appreciated. Thanks.
> >
> >
> > Rich
> >




>