Number of transitions to forwarding state 1BPDU : sent 121, received 2The port is not in the Edge port modePort 379 (GigabitEthernet 2/3) is designated ForwardingPort path cost 20000, Port priority 128, Port Identifier 128.379Designated root has priority 32768, address 0001.e801.cbb4Designated bridge has priority 32768, address 0001.e801.cbb4Designated port id is 128.379, designated path cost 0Number of transitions to forwarding state 1BPDU : sent 121, received 5The port is not in the Edge port modePort 380 (GigabitEthernet 2/4) is designated ForwardingPort path cost 20000, Port priority 128, Port Identifier 128.380Designated root has priority 32768, address 0001.e801.cbb4Designated bridge has priority 32768, address 0001.e801.cbb4Designated port id is 128.380, designated path cost 0Number of transitions to forwarding state 1BPDU : sent 147, received 3The port is not in the Edge port modeTo confirm that a port is participating in RSTP, use the show spanning-tree rstp brief commandfrom EXEC privilege mode.R3#show spanning-tree rstp briefExecuting IEEE compatible Spanning Tree ProtocolRoot ID Priority 32768, Address 0001.e801.cbb4Root Bridge hello time 2, max age 20, forward delay 15Bridge ID Priority 32768, Address 0001.e80f.1dadConfigured hello time 2, max age 20, forward delay 15Interface DesignatedName PortID Prio Cost Sts Cost Bridge ID PortID---------- -------- ---- ------- --- ------- ------------- --------Gi 3/1 128.681 128 20000 BLK 20000 32768 0001.e80b.88bd 128.469Gi 3/2 128.682 128 20000 BLK 20000 32768 0001.e80b.88bd 128.470Gi 3/3 128.683 128 20000 FWD 20000 32768 0001.e801.cbb4 128.379Gi 3/4 128.684 128 20000 BLK 20000 32768 0001.e801.cbb4 128.380InterfaceName Role PortID Prio Cost Sts Cost Link-type Edge------- --- ------ -------- ---- ------- --- -----------Gi 3/1 Altr 128.681 128 20000 BLK 20000 P2P NoGi 3/2 Altr 128.682 128 20000 BLK 20000 P2P NoGi 3/3 Root 128.683 128 20000 FWD 20000 P2P NoGi 3/4 Altr 128.684 128 20000 BLK 20000 P2P NoR3#Adding and Removing InterfacesTo add and remove interfaces, use the following commands.To add an interface to the Rapid Spanning Tree topology, configure it for Layer 2 and it is automaticallyadded. If you previously disabled RSTP on the interface using the command no spanning-tree 0command, re-enable it using the spanning-tree 0 command.• Remove an interface from the Rapid Spanning Tree topology.no spanning-tree 0Rapid Spanning Tree Protocol (RSTP) 691
