route withdraws on BGP route-refresh

[Christos Trochalakis]

Hello all,

While debugging a route-refresh issue we discovered that when a route-refresh
is received, bird, instead of just sending an update containing the exported
routes, also withdraws **all known routes** from its peer. In our case, it
withdraws the whole FIRT sending multiple BGP updates. Is this the expected
behaviour? We are using bird 1.4.5.

We believe that the opposite router has trouble processing all those withdrawed
routes which leads to other connectivity issues.