交换机S6850接口updown原因是什么？目前接口收发光正常，端口现在也是起来的。

 IFNET/3/PHY_UPDOWN: Physical state on the interface Ten-GigabitEthernet1/0/1 changed to down. IFNET/5/LINK_UPDOWN: Line protocol state on the interface Ten-GigabitEthernet1/0/1 changed to down. LAGG/6/LAGG_INACTIVE_PHYSTATE: Member port XGE1/0/1 of aggregation group BAGG1 changed to the inactive state, because the physical or line protocol state of the port was down. DRNI/6/DRNI_IFEVENT_DR_NOSELECTED: Local DR group 1 does not have selected member ports. IFNET/3/PHY_UPDOWN: Physical state on the interface Ten-GigabitEthernet1/0/1 changed to up. LAGG/6/LAGG_ACTIVE: Member port XGE1/0/1 of aggregation group BAGG1 changed to the active state. IFNET/5/LINK_UPDOWN: Line protocol state on the interface Ten-GigabitEthernet1/0/1 changed to up. DRNI/6/DRNI_IFEVENT_DR_SELECTED: Local DR group 1 has selected member ports. LLDP/6/LLDP_CREATE_NEIGHBOR: Nearest bridge agent neighbor created on port Ten-GigabitEthernet1/0/1 (IfIndex 1), neighbor's chassis ID is 7450-4ebe-0422, port ID is Ten-GigabitEthernet1/2/0.