I just turned up a DS3 this morming and need some help configuring BGP. The DS3 is replacing 3 T1's. I will be keeping one T1 for failover. The problem I am having is that right now almost all outbound traffic is going over the T1's I will be dropping and there is a lot of in bound traffic on the T1 I will be keeping for failover. Below is my config. The Savvis T1's will be dropped as will the Global Crossing. Only the Internap T1 will remain.
You're traffic leaving out the T1's looks to be due to your statics to default pointing at the T1 next-hops and only one (4th one) points out the Internap exit point.
ip route 0.0.0.0 0.0.0.0 184.108.40.206
ip route 0.0.0.0 0.0.0.0 220.127.116.11
ip route 0.0.0.0 0.0.0.0 Serial2/0:0.1
ip route 0.0.0.0 0.0.0.0 Serial2/1:0
ip route 0.0.0.0 0.0.0.0 18.104.22.168 254
You're traffic coming back may be coming back over the T1's due to your route-map TO-INTERNAP. It is only matching traffic in ACL 100 but if this is most of your address space then prepending that many PATHS to your AS path will keep most all traffic from entering this link destined to the address space defined in ACL 100.
I only briefly went over your configs so I might have missed something but I hope this helps,
Thanks Don, I will try removing the statics not needed. Also the ACL 100 is all of my address space. and I am prepending it 10 times. I just got of the phone with Internap and they do some funky stuff to preferances that could overide prepends. I wish I new more about BGP and could clean up the mess I have have inherited. Anyway I'll keep at it. Can you or anyone point to a referance on regular expressions, like this, ip as-path access-list 1 permit ^$.
BGP takes shortest AS path as first choice of route so your prepended routes with +10 AS path will look very bad as a routing decision. I wuold recommend you remove this and you might find your traffic comes back through the DS3 as you want. I would surely consult with your ISP though for sure.
Don, the route with the prepends is the one I don't want traffic to use. So I would think removing it would only make the situation worse. I removed the static routes but that had the effect of sending the traffic out over the Internap circuit, not the DS3. I am hoping to get some suggestions from Internap.
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