Example 63 Locating the Root Bridge with show spantree on Cat2 for VLAN

Cat-2 (enable) show spantree VLAN 1 Spanning tree enabled Spanning tree type ieee Designated Root 00-e0-f9-16-28-00 Designated Root Priority 100 Designated Root Cost 38 Designated Root Port 2/2 Root Max Age 10 sec Hello Time 1 sec Forward Delay 10 sec Bridge ID MAC ADDR 00-e0-f9-1d-32-00 Bridge ID Priority 32768 Bridge Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec Port Vlan PortState Cost Priority Fast-Start Group-method-----------------------------------------

--------------------2/1 1 forwarding 19 32 disabled 2/2 1 forwarding 19 32 disabled

2/3 1 blocking 100 32 disabled

Cat-2's Root Port is Port 2/2. After determining Port 2/2's neighboring bridge (Cat-4), Telnet to Cat-4 and issue the show spantree command as in Example 6-4.

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