Methods and steps for troubleshooting switches

(1) Elimination method:
When we face fault phenomena and analyze problems, we unintentionally learn to use troubleshooting methods to determine the direction of the fault. This method refers to listing all possible faults as comprehensively as possible based on the observed fault phenomena, and then analyzing and eliminating them one by one. Follow the principle of transitioning from simple to complex when excluding to improve efficiency. This method can be used to handle various faults, but maintenance personnel need to have strong logical thinking and a comprehensive and in-depth understanding of switch knowledge.
(2) Comparison method:
The so-called comparison method refers to using existing switches of the same model that can operate normally as a reference, comparing them with faulty switches, and identifying the fault point. This method is simple and effective, especially for situations where system configuration fails. By simple comparison, differences in configuration can be discovered. However, sometimes it is not easy to find switches of the same model and configuration.
(3) Replacement method:
This is the most commonly used method and also the most commonly used method for repairing computers. The replacement method refers to replacing potentially faulty components with normal switch components to identify the fault point. Mainly used for diagnosing hardware faults, but it should be noted that the replaced components must be switches of the same brand, model, and type.
Of course, in order to ensure an orderly troubleshooting process, we can follow the following principles when analyzing faults.
1. From far to near
Due to the fact that general issues with switches, such as port failures, are discovered through connected computers, inspections typically start from the client side. We can follow the client computer -> Port Module -> Horizontal Cable -> Jumper -> Check the route of the switch one by one, first ruling out the possibility of remote faults. Notes on switches - vigilance - common sense section: mainly introduces the flexible use of various phenomena to eliminate faults, compare, and replace methods when analyzing switch faults, as well as the analysis principles from far to near and from outside to inside.
2. From outside to inside
If the switch malfunctions, we can first identify it from various external indicator lights, and then check the corresponding internal components for any problems based on the fault indications. For example, when POWERLED is green, it indicates normal power supply, and when it is off, it indicates no power supply; If LINKLED is yellow, it indicates that the current working speed of the connection is 10Mb/s. If it is green, it indicates that the connection speed is 100Mb/s. If it goes off, it means there is no connection. If flashing, it indicates that the port has been manually closed by the administrator; RDPLED indicates redundant power supply; MGMTLED indicator management module. Regardless of whether the fault location can be determined externally, it is necessary to log in to the switch to determine the specific fault location and take corresponding troubleshooting measures.
3. From soft to hard
When a malfunction occurs, no one is willing to use a screwdriver to disassemble the switch first, so when checking, always start with the system configuration or system software. If the software cannot solve the problem, then there is a hardware problem. For example, if a certain