Re: BGP And Load Balancing With Two Routers
- From: oliver.ramirez@xxxxxxxxx
- Date: 17 Oct 2005 10:27:01 -0700
Matt,
Make sure that you see the route coming from Sprint as well for the
destination in the traceroute. Do a 'sh ip bgp <prefix>' to confirm.
If the network isn't advertised by Sprint, then traffic will have to go
through the Qwest router (this is assuming your doing iBGP between the
two).
-Oliver
Matt wrote:
> Hi,
> Our network is setup as such:
>
> SPRINT (45Meg) -----> ROUTER A
>
> QWEST (10Meg) ------> ROUTER B
>
> Router A and B, then interconnect with a patch cable.
>
> We are currently running BGP between the routers, as well as with our
> peers (SPRINT/QWEST). As Qwest is only a 10Meg pipe I would like to
> reduce the amount of traffic that is going out. I have tried
> weighting, localpref, (for outbound traffic) and as-prepend (for inbound
> traffic) but have not been able to get anything to work. I have issued
> "clear ip bgp *" after each command, but still no go. Below are the
> commands I've issued.. any thoughts?
>
> ROUTER A:
> neighbor 160.81.248.77 remote-as 1239
> neighbor 160.81.248.77 description ebgp link to sprint
> neighbor 160.81.248.77 version 4
> neighbor 160.81.248.77 weight 150
> neighbor 160.81.248.77 soft-reconfiguration inbound
> neighbor 160.81.248.77 filter-list 2 out
>
> ROUTER B:
> bgp default local-preference 75
> neighbor 65.123.21.137 remote-as 209
> neighbor 65.123.21.137 description ebgp link to qwest
> neighbor 65.123.21.137 version 4
> neighbor 65.123.21.137 soft-reconfiguration inbound
> neighbor 65.123.21.137 route-map filter out
>
>
> route-map filter permit 10
> set as-path prepend 26383 26383 26383
>
>
> on ROUTER A, a sh ip bgp shows that localpref and weight are going in:
> *> 8.2.64.0/23 160.81.248.77 29 150 1239 7132
> 16803 16803 16803 i
> *> 8.3.41.0/24 160.81.248.77 29 150 1239 7911
> 7911 7911 30033 30033 i
> *> 8.3.43.0/24 160.81.248.77 29 150 1239 7911
> 7911 7911 30033 30033 i
> *> 8.6.240.0/24 160.81.248.77 29 150 1239 7911
> 7911 7911 31846 31846 31846 31846 31846 i
> *> 8.7.83.0/24 160.81.248.77 29 150 1239 5650
> 5650 12284 ?
> *> 8.8.9.0/24 160.81.248.77 610 150 1239 27646 ?
> *>i8.10.50.0/24 65.123.21.137 8937 75 0 209 32760 i
> *> 8.10.119.0/24 160.81.248.77 190 150 1239 4323
> 25642 ?
> *> 8.10.128.0/24 160.81.248.77 190 150 1239 4323
> 25642 i
> *> 8.10.241.0/24 160.81.248.77 29 150 1239 6395
> 22324 22324 22324 22324 i
> *> 8.15.2.0/24 160.81.248.77 29 150 1239 6395
> 26049 26049 26049 26049 i
> *> 8.15.5.0/24 160.81.248.77 29 150 1239 6395
> 26049 26049 26049 26049 i
> *> 8.15.6.0/24 160.81.248.77 29 150 1239 6395
> 26049 26049 26049 26049 i
> *> 12.0.18.0/24 160.81.248.77 50 150 1239 27585 i
> *>i12.0.48.0/20 65.123.21.137 8710 75 0 209 1742 i
>
> But a traceroute from me to a site hosted on the qwest network goes out
> my qwest router, rather then going out my Sprint router.
> 1 faste-2-0-medusa (63.174.244.17) 0.482 ms 32.847 ms 9.912 ms
> 2 faste-2-0-hydra (65.165.94.77) 2.403 ms 12.238 ms 9.897 ms
> 3 pa1-edge-03.inet.qwest.net (65.123.21.137) 9.949 ms 11.850 ms
> 8.757 ms
> 4 aggr-01.ewr.qwest.net (205.171.17.169) 10.402 ms 10.607 ms 11.627 ms
> 5 jfk-core-02.inet.qwest.net (205.171.8.246) 10.982 ms 10.742 ms
> 11.421 ms
> 6 jfk-edge-01.inet.qwest.net (205.171.30.86) 10.839 ms 11.201 ms
> 10.759 ms
> 7 65.116.172.98 (65.116.172.98) 42.611 ms 42.381 ms 42.830 ms
> 8 suscomweb.synacor.com (208.197.227.23) 41.574 ms 41.672 ms 41.730 ms
>
> I would like any traffic originating from ROUTER A to go out SPRINT
> (unless Sprint is down), and any traffic originating from ROUTER B to go
> out QWEST (unless Qwest is down).
>
> That doesn't seem to be happening...
>
> Any thoughts?
.
- References:
- BGP And Load Balancing With Two Routers
- From: Matt
- BGP And Load Balancing With Two Routers
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