[afnog] BGP routing in multihomed environment

[Bill Sangiwa]

hi!

my schematic network, have BGP (plain vanilla as below) to both UPstream 
providers

ISP (AS36959) <-- RX ONLY-- Europe HUB (AS25228)--- NET

                     ^
                      ---TX/RX ----> Europe HUB(AS5377) ---- NET


from looking glass (router ID is 195.66.225.241), is see the routes via 
AS25228 are repeated

<my network>  195.66.226.77    0   0 3356 25228 25228 25228 36959 i

what could be wrong on the setup. certainly that route is not favoured and how 
to i make it more favoured? will the use of non-exist-map and the 
advertise-map keywords would help to overcome the problem? anything am 
missing??

router bgp 36959
 no synchronization
 bgp log-neighbor-changes
 bgp dampening
 ! 
 network 196.12.12.0 mask 255.255.252.0
 <.... some network command removed...>
 !
 neighbor 193.219.192.33 remote-as 5377
 neighbor 193.219.192.33 description <UPSTREAM A>
 neighbor 193.219.192.33 ebgp-multihop 255
 neighbor 193.219.192.33 update-source Loopback0
 neighbor 193.219.192.33 version 4
 neighbor 193.219.192.33 timers 60 1000
 neighbor 193.219.192.33 send-community
 neighbor 193.219.192.33 soft-reconfiguration inbound
 neighbor 193.219.192.33 prefix-list receive in
 neighbor 193.219.192.33 prefix-list announce out
 !
 neighbor 217.194.158.230 remote-as 25228
 neighbor 217.194.158.230 description to  <UPSTREAM B>
 neighbor 217.194.158.230 password <too secure to release>
 neighbor 217.194.158.230 ebgp-multihop 255
 neighbor 217.194.158.230 update-source Loopback0
 neighbor 217.194.158.230 version 4
 neighbor 217.194.158.230 send-community
 neighbor 217.194.158.230 soft-reconfiguration inbound
 neighbor 217.194.158.230 prefix-list receive in
 neighbor 217.194.158.230 prefix-list announce out
 !
 neighbor 217.194.158.231 remote-as 25228
 neighbor 217.194.158.231 description to <UPSTREAM B backup>
 neighbor 217.194.158.231 password <too secure to release>
 neighbor 217.194.158.231 ebgp-multihop 255
 neighbor 217.194.158.231 update-source Loopback1
 neighbor 217.194.158.231 version 4
 neighbor 217.194.158.231 send-community
 neighbor 217.194.158.231 soft-reconfiguration inbound
 neighbor 217.194.158.231 prefix-list receive in
 neighbor 217.194.158.231 prefix-list announce out
 !
 no auto-summary
!

-- 
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A brother offended is harder to be won than a strong city
-- King Solomon