STP防护机制介绍
星期四, 三月 10th, 2011BPDU Guard：如果接口启用STP PortFast特性，那么当该接口接收到任何BPDU的时候，BPDU Guard能够使其进入“err-disable”状态，需要配置errdisable recovery后才可自动恢复。
SW(config)#[no] spanning-tree portfast bpduguard default //所有配置了PortFast的端口启用BPDU Guard
or
SW(config-if)#spanning-tree portfast
SW(config-if)#spanning-tree bpduguard enable | disable%SPANTREE-2-RX_PORTFAST: Received BPDU on PortFast enabled port. Disabling FastEthernet0/2.
%PM-4-ERR_DISABLE: bpduguard error detected on Fa0/2, putting Fa0/2 in err-disable state
SW(config)#errdisable recovery cause bpduguard
SW(config)#errdisable recovery interval 30 //30秒后恢复%PM-4-ERR_RECOVER: Attempting to recover from bpduguard err-disable state on Fa0/2
STP Protect
