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Chapter 11
Troubleshooting Switched Ethernet
show spantree
Although the spanning tree process is covered later in this chapter, the use of
spanning trees is crucial to the successful running of switched networks
where loops may occur. The show spantree command reports the status of
the spanning tree process for each VLAN, when enabled as follows:
Switch_A> (enable) show spantree
VLAN 1
Spanning tree enabled
Spanning tree type ieee
Designated Root 00-90-86-fc-48-00
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 00-90-86-fc-48-00
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 19 32 disabled
2/2 1 forwarding 19 32 disabled
2/3 1 forwarding 19 32 disabled
2/4 1 forwarding 19 32 disabled
2/5 1 forwarding 19 32 disabled
2/6 1 not-connected 19 32 disabled
2/7 1 forwarding 19 32 disabled
2/8 1 forwarding 19 32 disabled
2/9 1 not-connected 100 32 disabled
. . . some output omitted . . .
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