From: Matt.Wilkerson@xxxxxxxxxx
Date: Tue May 22 2001 - 11:41:04 GMT-3
Finally... 1 I can contribute on :>)
You need to use a route-map on your bgp "neighbor x.x.x.x" statements. There
are 2 directions of traffic you need to influence, your inbound traffic and
your outbound traffic. This can most easily be done by adjusting the "as
path" and the "local pref" attributes.
On the outbound route-map, you'll need a "match" statement which will permit
any, followed by a set statement, which will prepend your AS a couple times
on the Williams link. This will make your williams link appear to have a
longer route, than the Level3 path. Which will shift your incoming traffic
to the Level3 link.
ex. L3- 3356-YourAS
Williams 5555-YourAS-YourAS-YourAS-YourAS
<----this appears a longer route
To affect your outbound traffic, you'll need to tag the Level3 link with a
higher "local-pref" See the short examples below...
#######################################
route-map Williams-Outbound-Map permit 10
match ip address 1 <---------references access list 1
set as-path prepend 3356 3356 3356
route-map Level3-Inbound-Map permit 10
match ip address 1 <--------Same here
set local-preference 200
access-list 1 permit any
router bgp YourAS
neighbor 1.1.1.1 route-map Williams-Outbound-Map out
neighbor 2.2.2.2 route-map Level3-Inbound-Map in
######################################
-----Original Message-----
From: Oriya Pollak [mailto:oriya@techiesclub.com]
Sent: Tuesday, May 22, 2001 11:09 AM
To: ccielab
Subject: BGP Question
Let me ask you all a question.
I have BGP running between our router to our 2 Internet uplinks - Level3
Communications and Williams Communications. I would like to push almost no
traffic or not at all to Williams but I do want to have it up in case level3
goes out and traffic needs to go on Williams.
Any ideas?
Oriya
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