NE5000E attached BAS GE interface configures more than 13 subinterfaces. OSPF is enabled on each interface. When the interface flaps, it is the same as GE interface that does not configure sub-interface. OSPF module of MPU board upgrades related interface. OSPF module of MPU is too busy and CPU usage of MPU is high.
Optical module of NE5000E and that of BAS mismatch. The interface is frequently UP/DOWN. Change optical module and it is normal.