When I used PVST and the root bridge is same for all VLANs. Only for VLAN 1 the root bridge is green in the topology view. When I filter STP for other VLAN the root bridge is grey:-( I use CM 4.0.5. When I changed the root bridge for VLAN 2 for example, the new root bridge for this VLAN is green. So is it some bug in the CM? Roman