BGP - Peer AS to multiple ISP 's and Load Balancing - Cisco
Posted on 2011-04-30
Scenario: customer has its own BGP AS (say AS 1234)and is peering with two separate ISP, with two seperate routers. They discover that one of the links is being utlized 70% and the other one 30%. What options do they have to balance out inbound utilization? I have found a few articles from Cisco that states a Route Map can be created to artifically prepend the AS-Path attribute for several of the IP prefixes that are be advertised with 1234 1234 1234 and this should shift a portion of the traffic to the other ISP by making the AS-Path hop count less than ideal. What other methods could be used?