BGP and Load Balancing

[j.way]

Hi,

I need to know how it is possible to load balance traffic when using BGP between 3 AS's. I didn't think BGP would load balance anything but how would one accomplish this? At least per session/host connection...

Thanks,

Josh

[j.way]

Please help... Thanks.

[jsoller]

Hi Josh,

We do egress load balancing to different ASs. I have a paper pending publication by Cisco press on this subject. If you tell me your email, I'll

send it to you.

Basically we block (see note below) incomming BGP routes, and send egree traffic (outbound Internet traffic) via multiple (same cost) default gateway statements. This provides equal cost egress traffic, regardless of the ingress traffic or hops. We have been running 2 and at times 3 different ISPs using this method for over 2 years now.

Note - If you have customers that need full BGP routes, their is a solution for this too (but it's not in my paper)...

Anyone else interested in an early copy of this paper, please let me know...

Jon Soller

Network Architect

State ISP (AS19713) & Wide Area Network Engineering

Department of Administrative Services

State of New Hampshire

4 Hazen Drive

Concord, NH 03301

jsoller@admin.state.nh.us

Office 603 271 5617

FAX 603 271 1516

Cell 603 738 1107