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三层交换和二层交换之间的端口聚合

下面是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:

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   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(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 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。但是在某些设备里,应注意聚合链路两端接口的速率,工作模式,例如在快以中,可将各个端口设置为speed 100,duplex full

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