CCNA指导：交换机链路聚合
下面是局域网的焦点交流机（三层交流）和二层交流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平衡，同时也起到了链路的备份浸染。可是在某些设备里，应注重聚合链路两头接口的速度，工作模式，例如在快以中，可将各个端口设置为speed 100,duplex full。
line con 0
line aux 0
line vty 0 4
login
!
endRouterB#sh run
Building configuration...Current configuration:
!
version 11.2
no service password-encryption
no service udp-small-servers
no service tcp-small-servers
!
hostname RouterB
!
!
!
interface Ethernet0
ip address 172.16.30.1 255.255.255.0
!
interface Serial0
ip address 172.16.20.2 255.255.255.0
clockrate 56000
!
interface Serial1
ip address 172.16.40.1 255.255.255.0
clockrate 56000
!
no ip classless
ip route 172.16.10.0 255.255.255.0 172.16.20.1
ip route 172.16.50.0 255.255.255.0 172.16.40.2
!
!
line con 0
line aux 0
line vty 0 4
login
!
end
RouterC#sh run
Building configuration...Current configuration:
!
version 11.2
no service password-encryption
no service udp-small-servers
no service tcp-small-servers
!
hostname RouterC
!
!
!
interface Ethernet0
ip address 172.16.50.1 255.255.255.0
!
interface Serial0
ip address 172.16.40.2 255.255.255.0
no fair-queue
!
interface Serial1
no ip address
shutdown
!
!
no ip classless
ip route 172.16.10.0 255.255.255.0 172.16.40.1
ip route 172.16.20.0 255.255.255.0 172.16.40.1
ip route 172.16.30.0 255.255.255.0 172.16.40.1
!
!
line con 0
line aux 0
line vty 0 4
login
!
endDefault IP Routing Running-configRouterA#sh run
Building configuration...Current configuration:
!
version 11.2
no service password-encryption
no service udp-small-servers
no service tcp-small-servers </p> !
hostname RouterA
!
!
!
interface Ethernet0
ip address 172.16.10.1 255.255.255.0
!
interface Serial0
ip address 172.16.20.1 255.255.255.0
no fair-queue
!
interface Serial1
no ip address
shutdown
!!
ip classless
ip route 0.0.0.0 0.0.0.0 172.16.20.2
!
!
line con 0
line aux 0
line vty 0 4
login
!
endRouterB#sh run
Building configuration...Current configuration:
!
version 11.2
no service password-encryption
no service udp-small-servers
no service tcp-small-servers
!
hostname RouterB
!
!
!
interface Ethernet0
ip address 172.16.30.1 255.255.255.0
!
interface Serial0
ip address 172.16.20.2 255.255.255.0
clockrate 56000
!
interface Serial1
ip address 172.16.40.1 255.255.255.0
clockrate 56000
!
no ip classless
ip route 172.16.10.0 255.255.255.0 172.16.20.1
ip route 172.16.50.0 255.255.255.0 172.16.40.2
!
!
line con 0
line aux 0
line vty 0 4
login
!
endRouterC#sh run
Building configuration...Current configuration:
!
version 11.2
no service password-encryption
no service udp-small-servers
no service tcp-small-servers
!
hostname RouterC
!
!
!
interface Ethernet0
ip address 172.16.50.1 255.255.255.0
!
interface Serial0
ip address 172.16.40.2 255.255.255.0
no fair-queue
!
interface Serial1
no ip address
shutdown
!
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.16.40.1
!
!
line c
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