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  今天我的s5130有短暂几次 掉线，这是监控log，请帮忙看下，大概是什么原因？是不是环了？

%@382503%Dec 16 12:58:36:196 2021 P2B33-Topcon-Monitor-AP-SFP-S1 STP/5/STP_BPDU_RECEIVE_EXPIRY: Instance 139's port GigabitEthernet1/0/28 received no BPDU within the rcvdInfoWhile interval. Information of the port aged out. %@382504%Dec 16 12:58:36:197 2021 P2B33-Topcon-Monitor-AP-SFP-S1 STP/5/STP_BPDU_RECEIVE_EXPIRY: Instance 140's port GigabitEthernet1/0/28 received no BPDU within the rcvdInfoWhile interval. Information of the port aged out. %@382505%Dec 16 12:58:36:198 2021 P2B33-Topcon-Monitor-AP-SFP-S1 STP/5/STP_BPDU_RECEIVE_EXPIRY: Instance 141's port GigabitEthernet1/0/28 received no BPDU within the rcvdInfoWhile interval. Information of the port aged out. %@382506%Dec 16 12:58:36:199 2021 P2B33-Topcon-Monitor-AP-SFP-S1 STP/5/STP_BPDU_RECEIVE_EXPIRY: Instance 142's port GigabitEthernet1/0/28 received no BPDU within the rcvdInfoWhile interval. Information of the port aged out. %@382507%Dec 16 12:58:36:200 2021 P2B33-Topcon-Monitor-AP-SFP-S1 STP/5/STP_BPDU_RECEIVE_EXPIRY: Instance 143's port GigabitEthernet1/0/28 received no BPDU within the rcvdInfoWhile interval. Information of the port aged out. ---- More ---- %@382508%Dec 16 12:58:36:201 2021 P2B33-Topcon-Monitor-AP-SFP-S1 STP/5/STP_BPDU_RECEIVE_EXPIRY: Instance 144's port GigabitEthernet1/0/28 received no BPDU within the rcvdInfoWhile interval. Information of the port aged out. %@382509%Dec 16 12:58:36:202 2021 P2B33-Topcon-Monitor-AP-SFP-S1 STP/5/STP_BPDU_RECEIVE_EXPIRY: Instance 145's port GigabitEthernet1/0/28 received no BPDU within the rcvdInfoWhile interval. Information of the port aged out. %@382510%Dec 16 12:58:36:203 2021 P2B33-Topcon-Monitor-AP-SFP-S1 STP/5/STP_BPDU_RECEIVE_EXPIRY: Instance 146's port GigabitEthernet1/0/28 received no BPDU within the rcvdInfoWhile interval. Information of the port aged out. %@382511%Dec 16 12:58:36:204 2021 P2B33-Topcon-Monitor-AP-SFP-S1 STP/5/STP_BPDU_RECEIVE_EXPIRY: Instance 147's port GigabitEthernet1/0/28 received no BPDU within the rcvdInfoWhile interval. Information of the port aged out. %@382512%Dec 16 12:58:36:204 2021 P2B33-Topcon-Monitor-AP-SFP-S1 STP/5/STP_BPDU_RECEIVE_EXPIRY: Instance 148's port GigabitEthernet1/0/28 received no BPDU within the rcvdInfoWhile interval. Information of the port aged out. %@382513%Dec 16 12:59:03:716 2021 P2B33-Topcon-Monitor-AP-SFP-S1 LLDP/6/LLDP_CREATE_NEIGHBOR: Nearest bridge agent neighbor created on port GigabitEthernet1/0/28 (IfIndex 28), neighbor's chassis ID is 9c54-c2d7-de8c, port ID is GigabitEthernet1/0/39. %@382514%Dec 16 13:00:23:945 2021 P2B33-Topcon-Monitor-AP-SFP-S1 IFNET/3/PHY_UPDOWN: Physical state on the interface GigabitEthernet1/0/23 changed to down. %@382515%Dec 16 13:00:23:946 2021 P2B33-Topcon-Monitor-AP-SFP-S1 IFNET/5/LINK_UPDOWN: Line protocol state on the interface GigabitEthernet1/0/23 changed to down. %@382516%Dec 16 13:00:23:952 2021 P2B33-Topcon-Monitor-AP-SFP-S1 LLDP/6/LLDP_DELETE_NEIGHBOR: Nearest bridge agent neighbor deleted on port GigabitEthernet1/0/23 (IfIndex 23), neighbor's chassis ID is b845-f418-dae0, port ID is GigabitEthernet1/0/1. %@382517%Dec 16 13:01:42:405 2021 P2B33-Topcon-Monitor-AP-SFP-S1 IFNET/3/PHY_UPDOWN: Physical state on the interface GigabitEthernet1/0/23 changed to up. %@382518%Dec 16 13:01:42:421 2021 P2B33-Topcon-Monitor-AP-SFP-S1 IFNET/5/LINK_UPDOWN: Line protocol state on the interface GigabitEthernet1/0/23 changed to up.