Cisco交换机上的链路聚合

文章作者 100test 发表时间 2007:09:25 13:24:32
来源 100Test.Com百考试题网

　　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