本文将为您讲述的思科交换机设置链路聚合的方法，下面我们就是以局域网的核心交换机（三层交换）和二层交换之间的端口聚合的操作实例，拓扑图如下：
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Switch>en
Switch#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Switch（config）#int f0/1
Switch（config-if）#channel-group 1 mode on
%LINK-5-CHANGED: Interface Port-channel 1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel 1, changed state to upSwitch（config-if）#int f0/2
Switch（config-if）#channel-group 1 mode on
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Switch（config）#int port-channel 1
Switch（config-if）#exit
Switch（config）#ip routing（默认已经启用了路由功能）
Switch（config）#int port-channel 1
Switch（config-if）#no switchport
Switch（config-if）#ip add 1.1.1.1 255.0.0.0
Switch（config-if）#no shut
Switch（config-if）#exit
Switch（config）#int f0/1
Switch（config-if）#no switchport
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to upSwitch（config-if）#
Switch（config-if）#no ip add
Switch（config-if）#channel-group 1 mode ?
active Enable LACP unconditionally
auto Enable PAgP only if a PAgP device is detected
desirable Enable PAgP unconditionally
on Enable Etherchannel only
passive Enable LACP only if a LACP device is detected
Switch（config-if）#channel-group 1 mode on
%LINK-5-CHANGED: Interface Port-channel 1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel 1, changed state to upSwitch（config-if）#
Switch（config-if）#int f0/2
Switch（config-if）#no switchport
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to upSwitch（config-if）#no ip add
Switch（config-if）#no ip address
Switch（config-if）#channel-group 1 mode on
Switch（config-if）#exit
Switch（config）#int f0/3
Switch（config-if）#no switchport
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to upSwitch（config-if）#ip add 2.2.2.1 255.0.0.0
Switch（config-if）#no shut
端口聚合可使流量在多条物理链路上负载均衡，同时也起到了链路的备份作用，