从现象看,Switch应该是收到了TC报文,进行了老化ARP的操作。
通过display stp tc命令也可以看到端口收到的TC报文情况:
[Switch-A-hidecmd] display stp tc
---------- Stp Instance 0 tc or tcn count ----------
Port GigabitEthernet1/0/0 0
Port GigabitEthernet1/0/1 0
Port GigabitEthernet1/0/2 0
Port GigabitEthernet1/0/3 0
Port GigabitEthernet1/0/4 87
Port GigabitEthernet1/0/5 123
Port GigabitEthernet1/0/6 99
Port GigabitEthernet1/0/8 71
Port GigabitEthernet1/0/9 173
Port GigabitEthernet1/0/10 146
Port GigabitEthernet1/0/13 8
Port GigabitEthernet1/0/21 0
分析日志,日志中也显示收到TC报文、进行ARP表项老化处理的记录:
Apr 19 2011 09:59:58 DCN_S9306_A %%01MSTP/6/RECEIVE_MSTITC(l): MSTP received BPDU with TC, MSTP process 0 instance 0, port name is Ethernet4/0/46.