Common troubleshooting methods for vswitch faults

1. Exclusion

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. The principle from simplicity to complexity should be followed 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.

2. Comparison

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.

3. replacement method

This is the most commonly used method, and it is also a frequently used method in the maintenance of the computer. 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, in order to make the troubleshooting work follow the rules, you can analyze the faults according to the following principles.

1. Outside

If the switch has a fault, we can first identify the various external indicators, and then check whether the internal components are faulty according to the fault instructions. For example, if the power is green, the power supply is normal. If the power is off, the power supply is unavailable. If the LINKLEDs is yellow, the connection currently works at 10 Mb/s. If the power is off, the connection is unavailable, flashing indicates that the port is manually disabled by the Administrator; RDPLED indicates redundant power supply; MGMTLED indicates the 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.

2. From soft to hard

In the event of a fault, no one wants to move, so the screwdrivers should first split the switch, so during the inspection, the system configuration or system software should always be used for troubleshooting. 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 you have eliminated various possibilities in the system and configuration, You can suspect that the real problem lies in hardware faults.

3. Easy and difficult

In case of complex fault analysis, you must start with simple operations or configuration. This can speed up troubleshooting and improve efficiency.

Summary

Due to various switch failures, there are no fixed troubleshooting steps, and some faults are often clearly oriented and can be identified at a glance. Therefore, it can only be analyzed based on specific situations. If you want to become a master in troubleshooting switch faults, you must accumulate experience in your daily work, every time you get a problem, you carefully review the root cause of the problem and the solution. In this way, we can constantly improve ourselves.

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