Ciscoコマンド集/S/switchport trunk allowed    トランクリンク上で特定VLANの追加や削除を行う

switchport trunk allowed

機種

Switch(K)

モード

Interface(M)

デフォルト

-

IOS

12.0(7)XE

試験レベル

BCMSN

構文

switchport trunk allowed vlan [add | remove] VLAN番号

使用例

●"switchport trunk allowed vlan add"コマンドでトランクリンクにVLANを追加する。

Switch#show interfaces trunk

Port        Mode         Encapsulation  Status        Native vlan
Fa0/12      on           802.1q         trunking      1

Port      Vlans allowed on trunk
Fa0/12      1-59,61-4094

Port        Vlans allowed and active in management domain
Fa0/12      1,70,80,90,100

Port        Vlans in spanning tree forwarding state and not pruned
Fa0/12      1,70,80,90,100
Switch#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)#int fa0/12
Switch(config-if)#switchport trunk allowed vlan add ?
  WORD  VLAN IDs of disallowed VLANS when this port is in trunking mode


Switch(config-if)#switchport trunk allowed vlan add 60 ?
  <cr>

Switch(config-if)#switchport trunk allowed vlan add 60*1
Switch(config-if)#end
Switch#show interfaces trunk

Port        Mode         Encapsulation  Status        Native vlan
Fa0/12      on           802.1q         trunking      1

Port      Vlans allowed on trunk
Fa0/12      1-4094

Port        Vlans allowed and active in management domain
Fa0/12      1,60,70,80,90,100

Port        Vlans in spanning tree forwarding state and not pruned
Fa0/12      1,60,70,80,90,100
Switch#

*1 トランクリンクからVLAN60を追加する

●"switchport trunk allowed vlan remove"コマンドでトランクリンクからVLANを削除する。

Switch#show interfaces trunk

Port        Mode         Encapsulation  Status        Native vlan
Fa0/12      on           802.1q         trunking      1

Port      Vlans allowed on trunk
Fa0/12      1-4094

Port        Vlans allowed and active in management domain
Fa0/12      1,60,70,80,90,100

Port        Vlans in spanning tree forwarding state and not pruned
Fa0/12      1,60,70,80,90,100
Switch#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)#int fa0/12
Switch(config-if)#switchport trunk allowed vlan remove ?
  WORD  VLAN IDs of disallowed VLANS when this port is in trunking mode


Switch(config-if)#switchport trunk allowed vlan remove 60 ?
  <cr>

Switch(config-if)#switchport trunk allowed vlan remove 60*2
Switch(config-if)#end
Switch#show interfaces trunk

Port        Mode         Encapsulation  Status        Native vlan
Fa0/12      on           802.1q         trunking      1

Port      Vlans allowed on trunk
Fa0/12      1-59,61-4094

Port        Vlans allowed and active in management domain
Fa0/12      1,70,80,90,100

Port        Vlans in spanning tree forwarding state and not pruned
Fa0/12      1,70,80,90,100
Switch#

解説

該当インターフェースのトランクリンク内にあるVLANをトランクリンクへ追加や削除を行う事が出来ます。

Tips

参考リンク

ネットワークエンジニアとして VLAN Trunk
Google検索

タグ

Trunk