Based on your configuration (Multi-homed to two ISPs through a single router) you can only do load sharing (the following configuration guide uses weight to accomplish this).
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml In this scenario, load balancing is not an option in a multihomed environment, so you can only do load sharing. You cannot do load balancing because BGP selects only a single best path to a destination among the BGP routes that are learned from the different ASs. The idea is to set a better metric for the routes in the range 1.0.0.0 to 128.0.0.0 that are learned from ISP(A) and a better metric for the rest of the routes that are learned from ISP(B). HTH, Andrew On 18/05/2010, at 12:42 AM, Andrew Tolstykh wrote: > Just a shot in the dark, but I don't see load balancing enabled in your > configuration snippet: > > router bgp xxxxx > maximum-paths 2 > > HTH, > Andrew > > On 17/05/2010, at 11:52 PM, amps wrote: > >> Scenario: 6509-3BXL receiving 2 full tables. >> >> Problem: Outbound traffic imbalance >> >> Feed 1 (AS1 in this example): Direct to tier-1 provider >> Feed 2 (AS2 in this example): Colo/house 'mix' of about 5 providers >> >> Outbound traffic pretty much all goes out feed 1. BGP tables from each >> provider are nearly identical, so the router is either choosing the lowest >> router-id, or shortest BGP path..even if I prepend the inbound on feed 1 I'm >> still seeing most/all traffic leave feed 1... any advice on getting traffic >> to balance without static route-maps? I'm perfectly happy if odd/even AS's >> were pref'd to one or the other...anything BGP based. Regex on the inbound >> route-maps? Example of something that might work? >> >> Thanks in advance... >> >> ##Current config: >> >> router bgp xxxxx >> no synchronization >> bgp log-neighbor-changes >> bgp update-delay 90 >> redistribute static route-map STATIC-TO-BGP >> neighbor x.x.x.1 remote-as 1 >> neighbor x.x.x.1 soft-reconfiguration inbound >> neighbor x.x.x.1 prefix-list ADVERTISE out >> neighbor x.x.x.1 route-map TRANSIT-1-IN in >> neighbor x.x.x.1 route-map TRANSIT-1-OUT out >> neighbor x.x.x.2 remote-as 2 >> neighbor x.x.x.2 soft-reconfiguration inbound >> neighbor x.x.x.2 prefix-list ADVERTISE out >> neighbor x.x.x.2 route-map TRANSIT-2-IN in >> neighbor x.x.x.2 route-map TRANSIT-2-OUT out >> no auto-summary >> >> route-map TRANSIT-1-IN permit 10 >> set as-path prepend last-as 1 >> ! >> route-map TRANSIT-1-OUT permit 10 >> set as-path prepend xxxxx >> ! >> route-map TRANSIT-2-IN permit 10 >> ! >> route-map TRANSIT-2-OUT permit 10 >> ! >> _______________________________________________ >> cisco-nsp mailing list [email protected] >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ >> > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
