9.1 介绍
EtherChannel可以将两根物理线路捆绑，相当于双倍带宽的一根线路。可以避免之前说的环路。
常说的：线路汇聚，汇聚成逻辑链路编号，可以实现负载均衡和冗余。
两种常用的协议可以用于部署，一种是思科私有，一种是LACP工业标准协议。
LACP协议模型
9.2 配置
两端ID一致，不同CHANNEL的ID不一样。
9.3 二层试验
2,3命令可选，5,6根据不同协议设置不同模式。
交换机两端除了VLAN的IP地址不一样外，其他配置都一样
SW2(config)#no ip routing
SW2(config)#interface range fastEthernet 0/1 - 2
SW2(config-if-range)#switchport trunk encapsulation dot1q
SW2(config-if-range)#switchport mode trunk
模拟器只有ON，真机有多种状态
SW2(config-if-range)#channel-group 1 mode ?
on Enable Etherchannel only
SW2(config-if-range)#channel-group 1 mode on查看EC 1信息
SW2#show etherchannel 1 summary
Flags: D - down P - in port-channel
I - stand-alone s - suspended
R - Layer3 S - Layer2
U - in use
Group Port-channel Ports
-----+------------+-----------------------------------------------------------
1 Po1(SU) Fa0/1(P) Fa0/2(P)
查看接口状态，可以看到EC1已经启动
SW1#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES unset up down
FastEthernet0/1 unassigned YES unset up up
FastEthernet0/2 unassigned YES unset up up
FastEthernet0/3 unassigned YES unset up down
FastEthernet0/4 unassigned YES unset up down
FastEthernet0/5 unassigned YES unset up down
FastEthernet0/6 unassigned YES unset up down
FastEthernet0/7 unassigned YES unset up down
FastEthernet0/8 unassigned YES unset up down
FastEthernet0/9 unassigned YES unset up down
FastEthernet0/10 unassigned YES unset up down
FastEthernet0/11 unassigned YES unset up down
FastEthernet0/12 unassigned YES unset up down
FastEthernet0/13 unassigned YES unset up down
FastEthernet0/14 unassigned YES unset up down
FastEthernet0/15 unassigned YES unset up down
Port-channel1 unassigned YES unset up up
Vlan1 unassigned YES unset up up
做EC后形成的逻辑接口
SW1#show run interface port-channel 1
Building configuration...
Current configuration : 54 bytes
!
interface Port-channel1
switchport mode trunk
end
查看VLAN信息
SW1#show vlan-switch
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/0, Fa0/3, Fa0/4, Fa0/5
Fa0/6, Fa0/7, Fa0/8, Fa0/9
Fa0/10, Fa0/11, Fa0/12, Fa0/13
Fa0/14, Fa0/15
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 1002 1003
1002 fddi 101002 1500 - - - - - 1 1003
1003 tr 101003 1500 1005 0 - - srb 1 1002
1004 fdnet 101004 1500 - - 1 ibm - 0 0
1005 trnet 101005 1500 - - 1 ibm - 0 0
查看TRUNK信息，EC1对应的PORT EC1
SW1#show interfaces trunk
Port Mode Encapsulation Status Native vlan
Po1 on 802.1q trunking 1
Port Vlans allowed on trunk
Po1 1-1005
Port Vlans allowed and active in management domain
Po1 1
Port Vlans in spanning tree forwarding state and not pruned
Po1 1
设置SW1的VLAN1的IP地址为1.1.1.2，SW2的VLAN1的IP地址为1.1.1.2。
SW1(config)#interface vlan 1
SW1(config-if)#ip address 1.1.1.2 255.255.255.0
SW1(config-if)#no shutdow
SW2(config)#interface vlan 1
SW2(config-if)#ip address 1.1.1.1 255.255.255.0
SW2(config-if)#no shutdown
从SW2PING测试SW1
SW2#ping 1.1.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/22/24 ms
9.4 三层试验
模拟器不支持