The switch failure troubleshooting steps (2)

2, software failure for switch:

Software fault switch is refers to the fault system and its configuration, it can be divided into the following categories.

(1) the system error:

Switch system is the combination of hardware and software. There is a refresh read only memory in the switch, it is necessary to save the software system which switches. This kind ofmistake and our common Windows, like Linux, due to the design, there are some loopholes, inthe right conditions, can cause packet loss, packet switch, load fault conditions. So the switch system provides such as Web, TFTP to download and update system. In the course of theupgrade of the system, it may cause an error.

For such problems, we need to develop the habit of often browse equipment manufacturers website habits, if a new system or new patch, please update.

(2) improper configuration:

Beginners are not familiar with the switch, or because of various kinds of switch configuration is not the same, administrators often occurs in configuring the switch configuration error. For example, VLAN partition due to incorrect network impassability, port is mistakenly closed model,configure the switch and network card does not match. This kind of fault is sometimes hard tofind, need certain experience accumulation. If you can't ensure user configuration problem,please restore factory default configuration, and then configure the step by step. The bestbefore configuration, first read the instruction, one of which is to develop the habit of network management. Each switch has the installation manual, detailed user manual, into each modulehas a detailed explanation. Because a lot of switch manual is written by English, so English bad user can show the supplier engineer after the Advisory specific configuration.

(3) lost password:

This may be each administrator has ever experienced. If you forget your password, can through the operation of certain steps to recover or reset the system password. Some are relativelysimple, press a button on the switch can be. While others need to be resolved by the steps to a certain.

This kind of situation in general artificial forgotten or switch failure cause data loss occurs.

(4) external factors:

Because the virus or hacker attack conditions exist, there may be a host to send the connectionport number is not in conformity with the encapsulation rules packet switch processor, cause too busy, the data packet not forwarding, which led to the emergence of packet loss phenomenon of buffer overflow. There is a situation in which the broadcast storm, it will not only occupy a large amount of network bandwidth, but also will occupy the CPU a lot of processing time. Network iflong time is occupied by a large number of broadcast packets, the normal point ofcommunication can not be normal, network speed will be slow or paralysis.

A card or a port failure, are likely to cause broadcast storm. Because the switch can onlyseparate collision domains, but can not break up broadcast domains (no division in the case of VLAN), so when the number of broadcast packets accounted for 30% of the totalcommunication, network transmission efficiency will be decreased.

Rather than hardware failure is difficult to find in general software fault, problem solving, may not need to spend too much money, but need more time. It is best to develop the habit of recordinglog in daily work. Whenever fault occurs, completes the fault phenomenon, fault analysis, faultrecording process solutions, fault classified summary of work in a timely manner, to accumulatetheir experience. For example, sometimes in the configuration, due to various reasons, there was no influence on network or found no problem, but perhaps a few days later the problem willgradually appear. If the log records, you can associate a few days before the configurationerror. Because a lot of time will ignore this point, thought is the problem on the other hand, whenafter many detours, to find the problem. So the log records and the maintenance of informationis very necessary.

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