Vswitch troubleshooting in a short time

The problems related to switch faults are described here. There are many reasons that affect switch faults, such as stack module, management module (also called control module), and extension module. The failure rate of these modules is very small.

Switch fault classification: cable fault: In fact, this type of fault theoretically does not belong to the switch's own fault. However, in actual use, cable failure often causes the switch system or port to fail to work normally, therefore, such faults are also classified as switch hardware faults.

For example, if the connection is not tight, the cables are arranged incorrectly or in an irregular order during cable preparation. When connecting the cables, the cables should be connected using a straight line. The two optical fiber cables in the optical fiber cables are staggered, network loops are caused by incorrect line connections. Switch fault type: Port fault:

This is the most common hardware fault, whether it is fiber port or twisted pair RJ-45 port, in the plug-in connector must be careful. If the optical fiber plug is accidentally soiled, the optical fiber port may be contaminated and cannot communicate normally. Generally, one or more ports are damaged.

Therefore, after the failure of the computer connected to the port is ruled out, you can change the connected port to determine whether it is damaged. In case of such a fault, you can use alcohol cotton balls to clean the port after the power is off. If the port is damaged, you can only change the port.

From the above several hardware faults, poor data center environments can easily lead to various hardware faults, so when we build data centers, we must first build the anti-ray grounding and power supply, indoor temperature, indoor humidity, anti-electromagnetic interference, anti-static and other environments to provide a good environment for the normal operation of network equipment.

General troubleshooting steps for switch faults:

Vswitch faults are diverse, and different faults have different forms. In case of failure analysis, you must use various phenomena to flexibly use troubleshooting methods (such as troubleshooting, comparison, and replacement) to locate the fault and promptly eliminate it. Vswitch fault classification and troubleshooting methods: Division:

When we face the fault and analyze the problem, we have learned to use the exclusion method to determine the direction of the fault. Based on the observed fault phenomenon, this method lists all possible faults as much as possible, and then analyzes and resolves them one by one.

We should follow the principle of simplicity to complexity to improve efficiency. This method can be used to cope with various faults. However, maintenance personnel must have a strong logical thinking and have a thorough understanding of switch knowledge. Vswitch fault classification and troubleshooting methods: comparison method:

The comparison method is to use the existing vswitches of the same model that can run normally as the reference object and compare them with the faulty vswitch to find out the fault point. This method is simple and effective, especially for System Configuration faults. You only need to make a simple comparison to find out the configuration differences, however, it is not easy to find a vswitch with the same model and configuration.

Switch fault classification and troubleshooting method: replacement method: This is our most common method, and it is also a frequently used method in the maintenance of computers. Replacement refers to using normal switch components to replace faulty parts, so as to find the fault point. It is mainly used for the diagnosis of hardware faults, but it should be noted that the replaced parts must be the same type of switches of the same brand and model.

Of course, we can analyze faults according to the following principles in order to make the troubleshooting work follow the rules below. From far to near, the port module-> horizontal cable-> jumper-> switch line, check one by one, first eliminate the possibility of remote failure.

From the outside, if the switch fails, we can identify the various indicators from the outside, and then check whether the corresponding internal components are faulty according to the fault instructions. For example, if POWERLED is green, the power supply is normal.

If the connection is disabled, no power supply is available. If LINKLEDs is yellow, the connection currently works at 10 Mb/s. If the connection is green, the connection is 100 Mb/s. If the connection is disabled, the connection is not connected. If the connection is blinking, the port is manually disabled by the Administrator; RDPLED indicates redundant power supply; MGMTLED indicates administrator module. Regardless of whether the fault is located from the outside, you must log on to the switch to determine the specific fault and take corresponding troubleshooting measures.

From soft to hard, in the event of a fault, no one wants to move, so the screwdrivers should first remove the switch, so during the check, the system configuration or system software should always be checked first. If the problem cannot be solved on the software, the hardware is faulty. For example, if a port is not easy to use, we can first check whether the user's connected port is not in the corresponding VLAN, whether the port is disabled by another administrator, or other reasons for configuration.

If the system and configuration possibilities are eliminated, You can suspect that the real problem lies in hardware faults. It is easy, easy, and difficult. In case of Complicated Fault Analysis, you must start with simple operations or configuration. This can speed up troubleshooting and improve efficiency.

Vswitch fault classification and troubleshooting summary:

Due to a variety of switch faults, there is no fixed switch fault classification and troubleshooting, and some faults are often clearly oriented and can be identified at a glance. Therefore, it can only be analyzed according to the specific situation. Of course, no matter what kind of fault is difficult for a new network administrator.

Therefore, if you want to become a master of switch troubleshooting, you must accumulate experience in your daily work. Every time you get a problem, you should carefully review the root cause of the problem and the solution. In this way, we can constantly improve ourselves and better fulfill the important responsibilities of network management.

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