No experience with 6 here, but do your virsh-imported libvirt VM configs show <devices>...<interface type=bridge>...<source bridge='br0'/> ? i.e. the bridge there matches the bridge name you're created with ifcfg scripts?
Eric
_______________________________________________
CentOS-virt mailing list
CentOS-virt@centos.org
http://lists.centos.org/mailman/listinfo/centos-virt