Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 996

To view the spanning tree configuration and the interfaces that are participating in STP, use the show spanning-tree 0 command from EXEC privilege mode. If a physical interface is part of a port channel, only the port channel is listed in the command output. R2#show spanning-tree 0 Executing IEEE compatible Spanning Tree Protocol Bridge Identifier has priority 32768, address 0001.e826.ddb7 Configured hello time 2, max age 20, forward delay 15 Current root has priority 32768, address 0001.e80d.2462 Root Port is 289 (TenGigabitEthernet 2/1), cost of root path is 4 Topology change flag not set, detected flag not set Number of topology changes 3 last change occurred 0:16:11 ago from TenGigabitEthernet 2/3 Timers: hold 1, topology change 35 hello 2, max age 20, forward delay 15 Times: hello 0, topology change 0, notification 0, aging Normal Port 289 (TenGigabitEthernet 2/1) is Forwarding Port path cost 4, Port priority 8, Port Identifier 8.289 Designated root has priority 32768, address 0001.e80d.2462 Designated bridge has priority 32768, address 0001.e80d.2462 Designated port id is 8.496, designated path cost 0 Timers: message age 1, forward delay 0, hold 0 Number of transitions to forwarding state 1 BPDU: sent 21, received 486 The port is not in the portfast mode Port 290 (TenGigabitEthernet 2/2) is Blocking Port path cost 4, Port priority 8, Port Identifier 8.290 --More-Timers: message age 1, forward delay 0, hold 0 Number of transitions to forwarding state 1 BPDU: sent 21, received 486 The port is not in the portfast mode To confirm that a port is participating in Spanning Tree, use the show spanning-tree 0 brief command from EXEC privilege mode. Dell#show spanning-tree 0 brief Executing IEEE compatible Spanning Tree Protocol Root ID Priority 32768, Address 0001.e80d.2462 We are the root of the spanning tree Root Bridge hello time 2, max age 20, forward delay 15 Bridge ID Priority 32768, Address 0001.e80d.2462 Configured hello time 2, max age 20, forward delay 15 Interface Designated Name PortID Prio Cost Sts Cost Bridge ID PortID Te 1/1 8.496 8 4 DIS 0 32768 0001.e80d.2462 8.496 Te 1/2 8.497 8 4 DIS 0 32768 0001.e80d.2462 8.497 Te 1/3 8.513 8 4 FWD 0 32768 0001.e80d.2462 8.513 Te 1/4 8.514 8 4 FWD 0 32768 0001.e80d.2462 8.514 Dell# Adding an Interface to the Spanning Tree Group To add a Layer 2 interface to the spanning tree topology, use the following command. • Enable spanning tree on a Layer 2 interface. INTERFACE mode 996 Spanning Tree Protocol (STP)