[isp-bgp] Re: Outbound Balancing

["james" <hackerwacker@...>]

OK, so 1 prepend tiped you too far over. I would move to adjusting local
pref
on selected prefixes, on just one session (BGP session). More weight=more
prefered.

There are several ways to classify which prefixes to add/subtract weight to.
If you know who your upstreams transit providers are, & they do not share
the same transits, here is one way:

Check syntax, I am dead tired !

ip as-path access list 1 permit ^<upstreamA's AS>_<upspreamA's transit AS_
(ie ^111_222_)
(repeate as needed)

ip as-path access list 2 permit ^<upstreamBs AS>_<upspreamBs transit AS_
(ie ^111_222_)

ip as-path access list 3 permit .*
(repeate as needed)

route-map upstreamA permit 5
match as-path 1
set local pref 110
!
route-map upstreamA permit 10
match as-path 3
set local pref 100
!
route-map upstreamB permit 5
match as-path 2
set local pref 110
!
route-map upstreamBpermit 10
match as-path 3
set local pref 100
!















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