BGP Issue

From: Ronnie Royston (RonnieR@xxxxxxxxxxxxxxxxx)
Date: Mon Feb 12 2001 - 13:56:43 GMT-3

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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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