简单的vlan trunk的配置：
第一步：添加vlan
1 Switch>enable 2 Switch#show vlan 3 4 VLAN Name Status Ports 5 ---- -------------------------------- --------- ------------------------------- 6 1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4 7 Fa0/5, Fa0/6, Fa0/7, Fa0/8 8 Fa0/9, Fa0/10, Fa0/11, Fa0/12 9 Fa0/13, Fa0/14, Fa0/15, Fa0/16 10 Fa0/17, Fa0/18, Fa0/19, Fa0/20 11 Fa0/21, Fa0/22, Fa0/23, Fa0/24 12 1002 fddi-default act/unsup 13 1003 token-ring-default act/unsup 14 1004 fddinet-default act/unsup 15 1005 trnet-default act/unsup 16 17 VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 18 ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 19 1 enet 100001 1500 - - - - - 0 0 20 1002 fddi 101002 1500 - - - - - 0 0 21 1003 tr 101003 1500 - - - - - 0 0 22 1004 fdnet 101004 1500 - - - ieee - 0 0 23 1005 trnet 101005 1500 - - - ibm - 0 0 24 25 Remote SPAN VLANs 26 ------------------------------------------------------------------------------ 27 28 29 Primary Secondary Type Ports 30 ------- --------- ----------------- ------------------------------------------ 31 Switch#vlan database 32 % Warning: It is recommended to configure VLAN from config mode, 33 as VLAN database mode is being deprecated. Please consult user 34 documentation for configuring VTP/VLAN in config mode. 35 36 Switch(vlan)#vlan 2 37 VLAN 2 added: 38 Name: VLAN0002 39 Switch(vlan)#vlan 3 40 VLAN 3 added: 41 Name: VLAN0003
第二步：建立vlan trunk
Switch# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Switch(config)#int fa0/1 Switch(config-if)#switchport mode trunk
第三步：将相应的端口添加到相应的vlan
原文：http://www.cnblogs.com/zhjsll/p/4362324.html