无法将允许的VLAN添加到中继，端口不是中​​继

我无法在trunk上添加允许的VLAN，而且端口不是中​​继。

我试过了：

Switch0#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Switch(config)#interface FastEthernet 0/1 Switch(config-if)#switchport trunk encapsulation dot1q Switch(config-if)#switchport mode trunk Switch(config-if)#switchport trunk allowed vlan add 1,2,3 Switch(config-if)#end 

但是它仍然表明：

 Switch#show interface FastEthernet 0/1 trunk Port Mode Encapsulation Status Native vlan Fa0/1 on 802.1q not-trunking 1 Port Vlans allowed on trunk Fa0/1 none Port Vlans allowed and active in management domain Fa0/1 none Port Vlans in spanning tree forwarding state and not pruned Fa0/1 none 

编辑：

• 如何在不同子网上的2个VLAN之间路由stream量
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• networking和共享在域networking上变得缓慢
• configurationc7000 10gb交换机进行负载均衡

 Switch#show vlan brief VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa0/1, Fa0/2, Fa0/3, Gi0/1 Gi0/2 2 VLAN0002 active Fa0/4, Fa0/5, Fa0/6, Fa0/7 Fa0/8, Fa0/9, Fa0/10, Fa0/11 Fa0/12, Fa0/13, Fa0/14, Fa0/15 Fa0/16, Fa0/17, Fa0/18, Fa0/19 Fa0/20, Fa0/21, Fa0/22, Fa0/23 3 VLAN0003 active Fa0/24 1002 fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup 1005 trnet-default act/unsup 

请指教。

我正在使用Cisco Catalyst 3550。