From: Johnny Dedon (johnny.dedon@xxxxxxxxxx)
Date: Mon Feb 12 2001 - 14:17:27 GMT-3
Ronnie,
Could you block all routing updates coming from AS3 at R2 except for a
default route and the prefer the a default coming from R1?
Johnny Dedon
Senior Staff Consultant
Exodus Professional Services
johnny.dedon@exodus.net
www.exodus.net
----- Original Message -----
From: "Ronnie Royston" <RonnieR@globaldatasys.com>
To: <ccielab@groupstudy.com>
Sent: Monday, February 12, 2001 10:56 AM
Subject: BGP Issue
> All you BGP guru's out there...
>
> I have:
>
> AS1 AS3
> | |
> R1---------iBGP---------R2
> ( AS2 )
>
> I want traffic to use the link between R2 and AS3 if and only if the link
> between R1 and AS1 is down. The Internet is behind AS1 and AS3. I would
> like to use AS path prepending to manipulate the traffic over R1's link,
but
> I do not know how many as hops there are between AS1 and AS3, or anything
> about the topology behind them (it's the Internet).
>
> I am thinking of using a conditional advertisement, but I believe that the
> convergence would be relatively slow. Is this the only way to ensure that
> traffic will use the R2 link in case of R1's link failure? ( I have no
> control over the AS3 or AS1 routers. ) If so, does anyone have any real
> world knowledge of how long a conditional advertisement would take to
> propogate out and converge?
>
>
>
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