STP 及其优化 实验拓扑图： R1Core1ED-SWCore2 实验步骤： 1. 设置SW1，SW2，SW3主机名分别为Core1,Core2, ED-SW 2. 把Core1与Core2间的两条链路绑定成etherchannel2，并设置成Trunk mode Core1: interface range fa0/23 - 24 switchport trunk encapsulation dot1q //支持ISL及dot1Q的交换机必须设置trunk的封装协议。低端的C2950，C2960，C2918只支持dot1Q，无此命令。 switch mode trunk //接口设置为Trunk模式。 channel-group 2 mode on //接口加入 Etherchannel2。 Creating a port-channel interface Port-channel 2 //系统提示自动创建 port-channel2。 interface Port-channel2 // Port-channel2 接口配置必须同物理接口一致。 switchport trunk encapsulation dot1q switchport mode trunk Core2: interface range fa0/23 - 24 switchport trunk encapsulation dot1q switch mode trunk channel-group 2 mode on Creating a port-channel interface Port-channel 2 interface Port-channel2 switchport trunk encapsulation dot1q switchport mode trunk 3. 验证 etherchannel设置 Core1#sh etherchannel summary //显示 etherchannel的详细信息 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 //目前已经建好 1个 etherchannel。 Number of aggregators: 1 Group Port-channel Protocol Ports ------+-------------+-----------+----------------------------------------------- 2 Po2(SU) - fa0/23(P) fa0/24(P) // S - Lay er2 U - in u se P - in port-channel 4. Core1，Core2，ED-SW间的所有链路均设置成Trunk ED-SW: int range f0/23 – 24 no shutdown switchport mode trunk Core1: int f0/21 switch trunk encap dot1q switch mode trunk Core2: int f0/21 switch trunk encap dot1q switch mode trunk 5. 验证 etherchannel设置 Core2#show interface...
