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
------+-------------+-----------+-----------------------------------------------
10 Po10(SU) PAgP Gi1/0/23(P) Gi1/0/24(P)
