From: Michael Le (mmle@xxxxxxxxxxxxxxxxx)
Date: Mon Feb 12 2001 - 14:25:50 GMT-3
What you want to do is increase the Local Preference on R1. R1 will tell the
rest of your AS that he is preferred, and then all IBGP peers (including R2)
will use him to go to the Internet. If you want everyone but R2 to use him,
increase the Weight on R2.
Michael Le, CCIE #6811
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Ronnie Royston
Sent: Monday, February 12, 2001 10:57 AM
To: ccielab@groupstudy.com
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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