STP

STP狀態
S1#show spanning interface gi0/1
S1#debug spanning-tree switch state

設定根橋接器
S1(config)#spanning-tree vlan 100 root primary
S1(config)#spanning-tree vlan 100 priority 0

設定交換埠的路徑成本
S1(config)#spanning-tree vlan 10 cost 2

啟用根防護
S1(config-if)#spanning-tree guard root

BPDU防護
啟用BPDU防護作為預設
S1(config)#spanning-tree portfast bpduguard default

啟用BPDU防護
S1(config-if)#spanning-tree bpduguard enable