此示例显示被动-主动模式 LACP 配置：
Catalyst 3750 交换机堆叠 A

3750switchstackA(config)#interface gigabitethernet 1/0/43  和 gi2/0/43
3750switchstackA(config-if-range)#channel-group 4 mode passive
3750switchstackA(config-if-range)#switchport trunk encapsulation dot1q
3750switchstackA(config-if-range)#switchport mode trunk


3750switchstackA(config)#interface gigabitethernet 3/0/3
3750switchstackA(config-if)#channel-group 4 mode passive
3750switchstackA(config-if)#switchport trunk encapsulation dot1q
3750switchstackA(config-if)#switchport mode trunk

Catalyst 3750 交换机 B

3750switchstackB(config)#interface range gigabitethernet 1/0/47 -  48
3750switchst(config-if-range)#channel-group 4 mode active
3750switchst(config-if-range)#switchport trunk encapsulation dot1q
3750switchst(config-if-range)#switchport mode trunk


您可以使用以下方法验证 EtherChannel 状态：

SH_Core_3750X_48#show interfaces port-channel 4
Port-channel4 is up, line protocol is up ()
  Hardware is EtherChannel, address is d8b1.9080.852b (
  MTU 1500 bytes,  Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255


SH_Core_3750X_48#show etherchannel 4 summary
Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port


Number of channel-groups in use: 3
Number of aggregators:           3

Group  Port-channel  Protocol    Ports
------+-------------+-----------+--------------------------------------
4      Po4(SU)         LACP      Gi1/0/43(P) Gi2/0/43(P)


参考文档：

http://www.cisco.com/cisco/web/support/CN/10/1099/1099133_cross_stack_etherchannel.html