Example 136 Examining Spanning Tree Details

3550_switch#show spanning-tree detail

VLAN0100 is executing the ieee compatible Spanning Tree protocol

Bridge Identifier has priority 32768, sysid 100, address 0 0 0a.8a0e.ba80 Configured hello time 2, max age 20, forward delay 15 We are the root of the spanning tree

Topology change flag not set, detected flag not set

Number of topology changes 0 last change occurred 03:01:07 ago

Times: hold 1, topology change 35, notification 2

hello 2, max age 20, forward delay 15 Timers: hello 0, topology change 0, notification 0, aging 300 Port 7 (FastEthernet0/7) of VLAN0100 is forwarding

Port path cost 100, Port priority 128, Port Identifier 128.7. Designated root has priority 32868, address 0 0 0a.8a0e.ba8 0 Designated bridge has priority 32868, address 0 0 0a.8a0e.ba8 0 Designated Port id is 128.7, designated path cost 0 Timers: message age 0, forward delay 0, hold 0 Number of transitions to forwarding state: 1 BPDU: sent 11, received 0 ! no BPDUs received

The port is in the portfast mode ! PortFast Enabled 3550 switch#

NOTE

PortFast, BPDU guard, and BPDU filtering can be used in a PVST+ or MST environment.

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