Neighbor lost on interface flap

[Simone Morandini]

Hi guys,

we use two machines running BIRD v. 1.3.8 as a bgp route-server on our 
IXP peering lan, and I noticed an apparently strange behavior: we had to 
reload the switch module on which our route server is connected, but 
after that, all v4 neighbors were showing "Error: neighbor lost", while 
all the v6 neighbors were ok.
After quitting the daemon and re-starting it, all the v4 bgp peers were 
up & running.
This happened all the times we had to reload the switch module, that is, 
all the times we "disconnected" the network interface from the peering lan.

Any clue on what could be the cause of this?

Thanks,
Simone.

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