Classification and elimination of core Switches

Faults of a core switch are hard to be listed here. The best solution is to do a good job of daily protection, keep relevant logs, and provide a suitable working environment for the switch, in this way, the core switch can work normally.

No matter how good the performance of a core switch device is, there will be potential faults. Just like a human, no matter how healthy, there will always be some minor faults, it is of course a good thing to be able to prevent it. But for this switch, which is the most important network engineer, it is inevitable to work hard day and night and occasionally encounter problems. So when a fault occurs, it is necessary to face up to the fault and solve the problem in a timely manner.

Despite the diversity of switch faults, the root cause of the problem is as follows: "the martial arts of the world are like Shaolin", which leads to the same things, and many of them often appear, the following section summarizes several typical faults and Their Solutions. Readers can also bypass them to help them solve the daily faults of switches.

Fault description: After the core switch is enabled, the switch is not operating normally, and the POWER indicator on the panel is not on, and the fan does not rotate. Fault cause: the fault is usually caused by unstable external power supply environment, aging of power supply lines, or power supply damage or fan stop due to lightning strikes, as a result, the switch cannot work normally.

Other components in the switch may be damaged due to power supply. Solution: it is easy to find and solve such problems. When such a fault occurs, first check the power supply system to see if the power outlet has current and whether the voltage is normal.

If the power supply is normal, check whether the power cord is damaged or not. If the power cord is damaged, replace one. If the power cord is loose, plug it again. If the problem persists, the problem should be caused by the power supply of the switch or other components in the machine.

The prevention method is also relatively simple. The first thing to do is to ensure the stability of the external power supply environment. This can be done by introducing an independent power line to provide an independent power supply, and add a voltage regulator to avoid instant high voltage or low voltage. If possible, it is recommended that you configure the UPS system (no fault: there is a computer room often some computers cannot access the server.

At first, it was thought that the network wiring was not standard and the NIC settings were modified by students. Therefore, the IDC administrator often tests the network cable and resets the network configuration of the system. However, after repeated repairs, the Network Connections of these computers are still good and bad. At the end, all the computers in this group cannot access the Internet, at the same time, It is also found that all the connection indicators of the vswitches connected to this group of computers are flashing irregularly.

Fault cause: the core switch is generally composed of the main circuit board and the power supply circuit board, resulting in such a fault is generally due to problems in these two parts. The main causes for the failure of the circuit board are: the components on the circuit board are damaged or the substrate is poor, the hardware remark is not suitable, and the circuit section type is not suitable after the hardware is updated and due to compatibility issues.

Solution: First, check whether there is a problem with the main circuit board or power supply circuit board. First, check the power supply part and use hichina to conduct power-on measurement when removing the load of the main circuit board, check whether the measured indicators are normal. If not.

Switch to an AT power supply, input power to the main circuit board, switch front panel indicators return to normal brightness and color, and the computer connected to this switch normal mutual access, it indicates that there is a problem with the power supply circuit board. If the above operation is invalid, the problem should occur on the main circuit board.

This is the most common switch failure, if the fiber plug or RJ-45 port is dirty, may cause port pollution and cannot communicate properly. In addition, many people usually like the live plugging connector. Theoretically, it seems that it is not inappropriate, but in fact, this often increases the port failure rate;

The port may be physically damaged due to carelessness during handling. The size of the purchased crystal head is too large, and the port is easily damaged when the switch is inserted. In addition, if a section of twisted pair wires connected to a port is exposed to the outside, the connected switch port may be damaged if the cable is hit by lightning.

Solution: Generally, a port fault is caused by some port damages. First, check the faulty computer. After the fault of the computer connected to the port is ruled out, you can replace the connected port, to determine whether the port is faulty. If the problem can be solved after the port is changed.

Further judge the reason for the port. After the power is off, use the alcohol cotton ball to clean the port. If the port is damaged, you can only change the port. In addition, whether it is fiber port or twisted pair RJ-45 port, in the plug-in connector must be careful, it is recommended that do not charge the operation when plugging.

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