A.BIDB.PIDC.端口costD.端口速率
A.30s B.15s C.45s D.50s
A.Switch(config)#spanning-tree vlan 99 priority 4096B.Switch(config)#spanning-tree vlan 1 priority 4096C.Switch#spanning-tree vlan 99 priority 4096D.Switch#spanning-tree vlan 1 priority 4096