Cisco Systems RJ-45-to-AUX manual Viewing the Spanning Tree Configuration on a CLI−Based IOS, 326

Catalyst5002> (enable) show spantree
VLAN 1
Spanning tree enabled
Spanning tree type	ieee

Designated Root		00−00−80−0c−a1−b3
Designated Root Priority		32768
Designated	Root Cost	0
Designated	Root Port	1/0

Root Max Age		20 sec	Hello Time 2		sec	Forward Delay 15 sec
Bridge ID MAC		ADDR		00−00−80−0c−a1−b3
Bridge ID Priority				32768
Bridge Max Age 20 sec			Hello Time 2 sec			Forward Delay 15 sec
Port	Vlan	Port−State		Cost	Priority		Fast−Start Group−method
————————	————	————————————		————	————————		—————————— ————————————
1/1	1	not−connected		19		32	disabled
1/2	1	not−connected		19		32	disabled
2/1	1	forwarding		10		32	disabled
2/2	1	forwarding		10		32	disabled
2/3	1	forwarding		10		32	disabled
2/4	1	forwarding		10		32	disabled
2/5	1	forwarding		10		32	disabled
2/6	1	not−connected		19		32	disabled
2/7	1	forwarding		100		32	disabled
2/8	1	forwarding		100		32	disabled
2/9	1	not−connected		100		32	disabled
2/10	1	forwarding		10		32	disabled
2/11	1	forwarding		10		20	disabled
2/12	1	not−connected		19		32	disabled
2/13	1	forwarding		10		32	disabled
2/14	1	forwarding		10		32	disabled
2/15	1	forwarding		10		32	disabled
2/16	1	not−connected		19		32	disabled
2/17	1	forwarding		10		10	disabled
2/18	1	forwarding		10		32	disabled
2/19	1	not−connected		100		10	disabled
2/20	1	forwarding		10		32	disabled
2/21	1	forwarding		100		32	disabled
2/22	1	not−connected		100		32	disabled
2/23	1	forwarding		10		32	disabled
2/24	1	not−connected		100		32	disabled

Viewing the Spanning Tree Configuration on a CLI−Based IOS

The show spantree command can be used on a CLI−based IOS to obtain configuration information and statistics on STP. Let’s take a look at the command, its optional syntaxes, and an example of its output:

show port <mod_num>

show port <mod_num/port_num> 1912EN#show spantree

VLAN1 is executing the IEEE compatible Spanning Tree Protocol Bridge Identifier has priority 32768, address 0030.8054.6C00 Configured hello time 2, max age 20, forward delay 15 Current root has priority 32768, address 0000.0C00.4BD0 Root port is Ethernet 0/1, cost of root path is 100 Topology change flag not set, detected flag not set

Topology changes 0, last topology change occurred 0d00h00m00s ago Times: hold 1, topology change 8960

hello 2, max age 20, forward delay 15

Timers: hello 2, topology change 35, notification 2

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