Cisco交換機鏈路聚合

下面是局域網的核心交換機（三層交換）和二層交換之間的端口聚合的操作實例：

2950

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

3560

Switch(config)#int port-channel 1
Switch(config-if)#exit
Switch(config)#ip routing(默認已經啓用了路由功能)
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條物理鏈路上負載均衡，同時也起到了鏈路的備份作用。但是在某些設備裏，應注意聚合鏈路兩端接口的速率，工作模式，例如在快以中，可將各個端口設置爲speed 100,duplex full。