一、2层 ethernet channel

interface)#channel-group number mode {on | auto [no-silent]|desirable [no-silent]}

on 使用EthernetChannel 但不发送pagp分组

off 禁用EthernetChannel

desirable  交换机主动要求形成一个EthernetChannel 发送pagp分组

auto     交换机被动形成一个EthernetChannel 不发送pagp分组 默认取值




Catalyst 2900  3500xl 平台上没有pagp 只有 on off不进行协商

ios  (global)# port-channel load-balance  method

——源地址    src-ip

——目的地址 dst-ip

——源和目的  src-dst-ip

——源mac地址 src-mac

——目的mac地址 dst-mac

——源和目的mac src-dst-mac

——源端口号 src-port

——目的端口号 dst-port

——源和目的端口号 src-dst-port


(global)# interface fastethernet 4/1
(interface)#channel-group 100 mode desirable non-silent
(global)# interface fastethernet 4/2
(interface)#channel-group 100 mode desirable non-silent
(global)# interface fastethernet 5/1
(interface)#channel-group 100 mode desirable non-silent
(global)# interface fastethernet 5/2
(interface)#channel-group 100 mode desirable non-silent
(global)#port-channel load-balance src-dst-ip
show etherchannel [channel-group] load-balance

绑定到一起的端口必须具有相同的属性如:速度 双工模式 vlan 干路模式 允许的vlan范围

3层 etherchannel


interface port-channel number


ip address address netmask


interface type mod/port

选择的端口必须是一个3层接口   no switchport


no ip address


channel-group number mode {auto |dusirable |on}


no shutdown


show ethernetchannel number port-channel

show interface type number etherchannel

show ethernetchannel summary



(config)#interface channel-group 1
(config-if)#ip address
(config-if)#interface gigabitethernet 1/1
(config-if)#no switchport
(config-if)#no ip address
(config-if)#channel-group 1 mod on
(config-if)#no shutdown
(config-)#interface gigabitethernet 1/2
(config-if)#no switchport
(config-if)#no ip address
(config-if)#channel-group 1 mode on
copy run start


(config)#interface gigabitethernet 0/1
(config-if)#port group 1
(config)#interface gigabitethernet 0/2
(config-if)#port group 1
#copy run start

我的试验3750配置实例  CastLyst 3750G

Switch#config t
Switch(config)#int gigabitEthernet 1/0/23
Switch(config-if)#channel-group 10 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 10 mode desirable non-silent
Switch(config)#int gigabitEthernet 1/0/24
Switch(config-if)#channel-group 10 mode desirable non-silent
Switch(config)#port-channel ?
load-balance Load Balancing method
Switch(config)#port-channel load-balance ?
dst-ip Dst IP Addr
dst-mac Dst Mac Addr
src-dst-ip Src XOR Dst IP Addr
src-dst-mac Src XOR Dst Mac Addr
src-ip Src IP Addr
src-mac Src Mac Addr
Switch(config)#port-channel load-balance src-dst-ip
Switch#show interfaces gigabitEthernet 1/0/23 etherchannel
Port state = Up Sngl-port-Bndl Mstr Not-in-Bndl
Channel group = 10 Mode = Desirable-NonSl Gcchange = 0
Port-channel = null GC = 0x000A0001 Pseudo port-channel = Po10
Port index = 0 Load = 0x00 Protocol = PAgP
Flags: S - Device is sending Slow hello. C - Device is in Consistent state.
A - Device is in Auto mode. P - Device learns on physical port.
d - PAgP is down.
Timers: H - Hello timer is running. Q - Quit timer is running.
S - Switching timer is running. I - Interface timer is running.
Local information:
Hello Partner PAgP Learning Group
Port Flags State Timers Interval Count Priority Method Ifindex
Gi1/0/23 U4/S4 H 30s 0 128 Any 10123
Age of the port in the current state: 00d:00h:03m:30s
Switch#show etherchannel summary
Flags: D - down P - in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)#
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
u - unsuitable for bundling
w - waiting to be aggregated
d - default port

Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports