Q

Multihop is only necessary for eBGP in special circumstances

My company is running BGp with one Provider right now -- soon to be two. Can you all tell me if I configure this right?
router bgp 11XXX
 no synchronization
 bgp log-neighbor-changes
 network 66.XXX.XXX.0 mask 255.255.240.0
 network 216.XXX.XXX.0 mask 255.255.248.0
 neighbor 216.XXX.XXX.8 remote-as 12345
 neighbor 216.XXX.XXX.8 description bgp to ISP
 neighbor 216.XXX.XXX.8 ebgp-multihop 5
 neighbor 216.XXX.XXX.8 update-source FastEthernet0/1/0
 neighbor 216.XXX.XXX.8 version 4
 neighbor 216XXX.XXX.8 soft-reconfiguration inbound
 neighbor 216.XXX.XXX.8 route-map ISP-inbound in
 no auto-summary

ip route 216.XXX.XXX.0 255.255.248.0 Null0
ip route 66.XXX.XXX.0 255.255.240.0 Null0

ip as-path access-list 5 permit .*
ip as-path access-list 10 permit ^$
!
route-map ISP-inbound permit 5
 match as-path 5


Your configuration looks like it should work. Assuming the router this configuration is going on will be directly connected to your transit provider you don't need "neighbor 216.XXX.XXX.8 ebgp-multihop 5." Multihop is only necessary for eBGP in special circumstances. You should re-evaluate the route-map. I'm not sure exactly what you are trying to accomplish, but this route-map is non-functional.
(Answered by Brandon Ross, VP of Operations, Sockeye Networks.)
This was first published in October 2002
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