No routes??

hello, I have two ubuntu 12.04 linux servers running bird 1.3.8 and peered with each other. The routes from each show in both routing tables. I installed centos 6.3 on an (identically configured) different set of servers and copied the configuration files. I see peering established but no routes in both routing tables. It doesnt work when peered with the ubuntu servers either. Please what may be wrong? Or am I just missing something?