The lights are not on.

Lamp Cat Failure: If the lamp of the lamp cat doesn't work, the first thing to consider is that the lamp cat has failed, either damaged or crashed. Once this happens, don't call the maintenance staff in a hurry. Try to turn off the light cat first, then stop 1~3 minutes before turning it on. It is possible to recover.

The reason for this situation is that Guang Mao did not restart for a long time, and the data occupied a large number of caches in Guang Mao, which led to the collapse or blockage of the management system in Guang Mao. Restarting is equivalent to clearing the cache once.

Network failure: If you often watch TV or surf the Internet, you must have seen such slogans as "So-and-so was caught stealing optical cable" or "It will cost millions if the optical cable is broken". In fact, they broke the trunk or sub-trunk that we used to surf the Internet. It is also possible to cut off the optical cable in windy weather and underground construction.

It should be noted that if this happens, it may lead to network paralysis in a certain area and directly affect the network connection in a certain area. If your area happens to be this area, then the light cat's signal light will not light up or flash red, and the network can only be restored after the network operator repairs the line.

Refer to the above? Baidu encyclopedia-light cat