以前好好的，然后 2台交换机之间一根专线被电信挖断了，现在就出现这个时不时会断的节奏，好无奈
核心上没有出现的报错信息，但2层上有报错
Jul 12 11:48:18: %SPANTREE-2-LOOPGUARD_UNBLOCK: Loop guard unblocking port GigabitEthernet1/0/25 on VLAN0050.
Jul 12 14:42:23: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/25, changed state to down
Jul 12 14:42:24: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/25, changed state to down
Jul 12 14:42:30: %SYS-6-LOGGINGHOST_STARTSTOP: Logging to host 192.168.47.195 Port 514 started - reconnection
Jul 12 14:42:35: %SYS-6-LOGGINGHOST_STARTSTOP: Logging to host 192.168.8.222 Port 514 started - reconnection
Jul 12 14:43:09: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/25, changed state to up
Jul 12 14:43:11: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/25, changed state to up
Jul 12 14:43:17: %SYS-6-LOGGINGHOST_STARTSTOP: Logging to host 192.168.47.195 Port 514 started - reconnection
Jul 12 14:43:22: %SYS-6-LOGGINGHOST_STARTSTOP: Logging to host 192.168.8.222 Port 514 started - reconnection
Jul 12 14:43:56: %SPANTREE-2-LOOPGUARD_BLOCK: Loop guard blocking port GigabitEthernet1/0/25 on VLAN0888.
Jul 12 14:43:57: %SPANTREE-2-LOOPGUARD_BLOCK: Loop guard blocking port GigabitEthernet1/0/25 on VLAN0050.
Jul 12 14:43:58: %SPANTREE-2-LOOPGUARD_BLOCK: Loop guard blocking port GigabitEthernet1/0/25 on VLAN0107.
Jul 12 14:44:36: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/25, changed state to down
Jul 12 14:44:37: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/25, changed state to down
Jul 12 14:44:42: %SYS-6-LOGGINGHOST_STARTSTOP: Logging to host 192.168.47.195 Port 514 started - reconnection
Jul 12 14:44:47: %SYS-6-LOGGINGHOST_STARTSTOP: Logging to host 192.168.8.222 Port 514 started - reconnection
Jul 12 14:44:49: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/25, changed state to up
Jul 12 14:44:51: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/25, changed state to up
Jul 12 14:44:57: %SYS-6-LOGGINGHOST_STARTSTOP: Logging to host 192.168.47.195 Port 514 started - reconnection
Jul 12 14:45:02: %SYS-6-LOGGINGHOST_STARTSTOP: Logging to host 192.168.8.222 Port 514 started - reconnection
Jul 12 14:45:20: %SPANTREE-2-LOOPGUARD_BLOCK: Loop guard blocking port GigabitEthernet1/0/25 on VLAN0888.
Jul 12 14:45:21: %SPANTREE-2-LOOPGUARD_BLOCK: Loop guard blocking port GigabitEthernet1/0/25 on VLAN0050.
Jul 12 14:45:23: %SPANTREE-2-LOOPGUARD_UNBLOCK: Loop guard unblocking port GigabitEthernet1/0/25 on VLAN0888.
Jul 12 14:45:24: %SPANTREE-2-LOOPGUARD_UNBLOCK: Loop guard unblocking port GigabitEthernet1/0/25 on VLAN0107.
