[c-nsp] BGP load balancing (outbound)

[Andrew Tolstykh]

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
> !
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