[quagga-users 14493] Serious BGP issue

Hi everyone,

I have a strange issue.
I have 2 external BGP routers. They both have 2 uplinks to my transit
providers and this works fine.
Until a while ago, when I wanted to take one router out for maintenance,
I would shut it's transit links, remove "default-information originate
always" from OSPF, set higher costs on the uplink and / or set
"max-metric router-lsa administrative"  wait for most of the traffic to
shift to the second router and do my maintenance.

Because the router would always have an iBGP link to the second router
it would receive all routes from this router and be fine in the case of
some traffic coming in anyway. But today I wanted to upgrade Quagga to
version 1.10 and I saw something really strange:

bgp02.as48972.net# sh ip bgp sum
BGP router identifier 95.130.232.3, local AS number 48972
RIB entries 1120940, using 120 MiB of memory
Peers 29, using 129 KiB of memory
Peer groups 3, using 96 bytes of memory
 
Neighbor        V         AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down 
State/P
fxRcd
77.222.66.177   4 16243 1434500   11053        0    0    0 01w0d16h   609362
78.152.49.109   4  5580 3162545   66219        0    0    0 01w0d16h   609733
95.130.232.2    4 48972       0       0        0    0    0 never    Idle
(Admin)
95.130.232.4    4 48972   10983   58016        0    0    0 02:28:03        0
95.130.232.6    4 48972 2536718   65789        0    0    0 02:21:53   137022
193.108.98.2    4 20828  208151   11056        0    0    0 2d09h49m   137235
193.108.98.3    4 20828  204274   11056        0    0    0 2d09h39m   137227
 
bgp03.as48972.net(config-router)# do sh ip bgp sum
BGP router identifier 95.130.232.6, local AS number 48972
RIB entries 311015, using 33 MiB of memory
Peers 21, using 94 KiB of memory
Peer groups 3, using 96 bytes of memory
 
Neighbor        V         AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down 
State/P
fxRcd
77.222.66.181   4 16243  298044     882        0    0    0 00:01:21 Idle
(Admin)
78.152.40.92    4  5580  559289    5234        0    0    0 00:01:14 Idle
(Admin)
95.130.232.2    4 48972       0       0        0    0    0 never    Idle
(Admin)
95.130.232.3    4 48972    7643  867546        0    0    0 02:21:10    39002
95.130.232.4    4 48972     837  558695        0    0    0 02:27:21        0
193.108.98.2    4 20828   68276     883        0    0    0 03:30:44   137235
193.108.98.3    4 20828   64031     883        0    0    0 03:30:35   137227

I would expect that the BGP03 would get at least 580.000 routes from the
BGP02, but this doesn't happen for some strange reason.
Also resetting the iBGP link between the BGP02 and BGP03 does not fix
the problem.

Anyone any idea?

jan Hugo Prins