链路聚合LACP 配置和结果验证（51cti实验11）

1. 实验线路连接图
使用Cisco Packet Tracer6.0 构建拓扑结构图。

2. 实验内容
(1) 按图配置各台计算机IP 地址。
(2) 参阅教材中内容，完成链路聚合的配置内容，配置要求如图9.14 所示。在各台交换机上使用show
running-config 和show etherchannel summary 查看链路聚合的配置情况，并使用Ping 指令测试各台计算
机之间的连通性。

SWA

Switch>enable
Switch#configure terminal
SA(config)#int range f0/1-2
SA(config-if-range)#channel-protocol ?
  lacp  Prepare interface for LACP protocol
  pagp  Prepare interface for PAgP protocol
SA(config-if-range)#channel-protocol  lacp
SA(config-if-range)#channel-group 1 mode active
SA(config-if-range)#
Creating a port-channel interface Port-channel 1
%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 up
%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 up
SA(config-if-range)#
SA con0 is now available
Press RETURN to get started.
%LINK-5-CHANGED: Interface Port-channel 1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel 1, changed state to up
SA#conf t
SA(config)#vlan 10
SA(config-vlan)#vlan 20
SA(config-vlan)#exit
SA(config)#interface FastEthernet0/3
SA(config-if)#switchport access vlan 10
SA(config)#interface FastEthernet0/4
SA(config-if)#switchport access vlan 20
SA(config-if)#exit
SA(config)#interface port-channel 1
SA(config-if)#switchport mode trunk
Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode.
SA(config-if)#switchport trunk encapsulation dot1q
SA(config-if)#switchport mode trunk
SA(config-if)#
%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel 1, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel 1, changed state to up
%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 up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to down
%LINK-5-CHANGED: Interface Port-channel 1, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel 1, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to up
%LINK-5-CHANGED: Interface Port-channel 1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel 1, changed state to up
SA(config-if)#
SA#
%SYS-5-CONFIG_I: Configured from console by console

SWB

Switch>enable
Switch#configure terminal
Switch(config)#hostname SB
SB(config)#int range f0/23-24
SB(config-if-range)#channel-protocol lacp
SB(config-if-range)#channel-group 1 mode active
SB(config-if-range)#

SB(config)#vlan 10
SB(config-vlan)#vlan 20
SB(config-vlan)#exit
SB(config)#interface FastEthernet0/1
SB(config-if)#switchport access vlan 10
SB(config)#interface FastEthernet0/2
SB(config-if)#switchport access vlan 20

SB(config)#interface port-channel 1
SB(config-if)#switchport trunk encapsulation dot1q
SB(config-if)#switchport mode trunk

3. 实验要求
掌握链路聚合的概念以及链路聚合的配置过程，理解channel group 和port-channel
（1） 结果分析
PAgP（Port Aggregation Protocol,端口汇集协议） Cisco 专有协议
LACP(Link Aggregation Control Protocol,链路汇集控制协议) IEEE 标准
交换机A 的1 口、2 口做成了channel-group 1，通道组1
交换机B 的23 口、24 口做成了channel-group 1，通道组1
两台交换机之间的channel-group 相互协商，按照lacp 协议协商，如果协商成功之
后，就会产生port-channel，端口通道
（2） 概念理解
链路聚合技术可以把低速的链路聚合成为一条高速链路，比较经济实用
先把端口捆绑成channel-group，通道组
两台交换机的通道组之间要相互按照规定的协议协商，成功之后才会形成port-channel（端口通道），而端口通
道可以按照vlan 的要求设定为trunk
show etherchannel summary