[isp-bgp] Re: Outbound Balancing

[Pete Templin <petelists@...>]

Serge Paquin wrote:
> I'm currently Multihomed with 2 ISPs and most of my traffic is outbound. 
> My inbound traffic is about a 70/30 ISP-B/ISP-A split which isn't to
> bad but since the acctualy volume is low I'm not to concerned.
>
> What does concern me is my outbound.  I'm about a 90/10 ISP-B/ISP-A
> split on my outbound traffic.
>
> My main router is a 2691 with 256megs ram.  It has a BGP session to
> ISP-A and an EBGP-Multihope session to ISP-B.
>
> Is there a reliable/easy way to balance outbound traffic 50/50?  Lacking
> that what are my options of getting myself closer to 50/50?
I'd build (or "upgrade") a route map "inbound" from ISP-B.  Prepend 
their AS to the routes you're receiving from them; most likely this will 
 start to shift the balance towards ISP-A.  If one prepend puts you too 
far past 50/50, you may need to start doing the prepending selectively 
based on individual ASes that ISP-B connects to, and/or start adjusting 
local preference based on those individual ASes that are your providers' 
upstreams.

pt






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