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:
 
 
   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。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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