SWA、SWB和SWC组成了一个环形的交换网络,为了消除环路对网络的影响,故使交换机都运行RSTP,最终将环形网络结构修剪成无环路的树形网络结构。
配置实现:
stp enable //全局开启STP
stp mode rstp //配置STP模式为RSTP
stp root primary //配置SWA为根桥
stp bpdu-protection //全局开启BPDU防护,配合边缘端口一起使用
stp edged-port enable //配置端口为边缘端口
<SWA>display stp brief
MSTID Port Role STP State Protection
0 GigabitEthernet0/0/1 DESI FORWARDING NONE
0 GigabitEthernet0/0/2 DESI FORWARDING NONE
<SWA>display stp
-------[CIST Global Info][Mode RSTP]-------
CIST Bridge :0 .4c1f-cc5f-55e4
Config Times :Hello 2s MaxAge 20s FwDly 15s MaxHop 20
Active Times :Hello 2s MaxAge 20s FwDly 15s MaxHop 20
CIST Root/ERPC :0 .4c1f-cc5f-55e4 / 0
CIST RegRoot/IRPC :0 .4c1f-cc5f-55e4 / 0
CIST RootPortId :0.0
BPDU-Protection :Disabled
[SWB]display stp brief
MSTID Port Role STP State Protection
0 GigabitEthernet0/0/1 ROOT FORWARDING NONE
0 GigabitEthernet0/0/3 DESI FORWARDING NONE
0 GigabitEthernet0/0/4 DESI FORWARDING BPDU
<SWC>display stp brief
MSTID Port Role STP State Protection
0 GigabitEthernet0/0/2 ROOT FORWARDING NONE
0 GigabitEthernet0/0/3 ALTE DISCARDING NONE
0 GigabitEthernet0/0/4 DESI FORWARDING BPDU