cisco交换机上的链路聚合

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

　　往往可能EthernetChannel的一端（一台服务器或者是网络分析仪)#没有产生pagp分组或者说是保持

　　“沉默"，可以使用关键字silent在15秒的延迟之后，让对端成为EthernetChannel.起对端为”沉默“

　　使用non－silent关键字则要求在激活EthernetChannel之前现进行pagp协商、

　　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

　　example

(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

　　1创建逻辑端口通道

　　interface port－channel number

　　2.配置端口通道上的协议信息

　　ip address address netmask

　　3.把物理3层接口分配给通道

　　interface type mod/port

　　选择的端口必须是一个3层接口 no switchport

　　4.删除任何协议地址

　　no ip address

　　5.把接口分配给通道组

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

　　6.核实接口已经启用

　　no shutdown

　　7核实通道

　　show ethernetchannel number port-channel

　　show interface type number etherchannel

　　show ethernetchannel summary

　　example

　　分布层交换机上

(config)#interface channel-group 1
(config-if)#ip address 192.168.1.1 255.255.255.0
(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
(config-if)#end
copy run start

　　接入层交换机（3500xl)#

(config)#interface gigabitethernet 0/1
(config-if)#port group 1
(config)#interface gigabitethernet 0/2
(config-if)#port group 1
(config)#end
#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#write
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