[Xorp-users] BGP conditional route advertising

[Kristian Larsson]

On Fri, Sep 01, 2006 at 11:56:21AM +0300, mihai at duras.ro wrote:
> I'll try adding a feature request then.
> 
> Prepending is sometimes not enough.
> 
> For example some upstream providers will always place a higher weight,
> local pref,etc on a route received from a certain peer and thus render the
> as-path prepend unusable.
Certainly. I'd say just about everyone places a
higher local preference on their own customers,
but that lpref won't be visible beyond your
upstream so just about everyone else on the
Internet will choose the best route based on the
shortest AS-PATH.
> 
> What I want is:
> 
> Announce my route over ISP1 while ISP1 is online (and don't receive any
> traffic on the backup ISPs).
> If ISP1 down then announce via ISP2.
> If ISP2 down..and so on.
You could probably do this via some form of shell
script that polls to see if ISP1 is down or not
and then add an advertisement via ISP2.
or buy a Cisco.. or do some XORP coding :)

Regards,
   Kristian.


> > On Fri, Sep 01, 2006 at 11:25:01AM +0300, mihai at duras.ro wrote:
> >> Hello,
> >>
> >> Sorry if this has been asked before but I had no luck while google-ing
> >> for
> >> it.
> >>
> >> Does XORP support BGP conditional route advertising as Cisco does with
> >> the
> >> advertise map per-neighbor command ?
> > As far as I know it does not, but it would indeed
> > be a nice feature. You could add a feature request
> > at http://www.xorp.org/bugzilla/index.cgi with a
> > small description of what you want :)
> >
> >> I'm searching for a solution to advertise some prefixes on a backup link
> >> only if the main link goes down (the default gateway is no longer
> >> received
> >> on it with an AS-PATH of the neighbors AS)
> > Isn't prepending your as-path enough?
> >
> > Regards,
> >     Kristian.
> >
> > --
> > Kristian Larsson                                   KLL-RIPE
> > Network Engineer                      Net at Once [AS35706]
> > +46 704 910401			     kristian at spritelink.se
> >
> 
>