Switch problems are urgent, and there are several common faults of typical switches and solutions

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Anatomy of Cisco switch failures: protocol errors and insufficient flash space, the following is a Cisco switch failure that everyone often encounters due to insufficient flash space on the switch. Know a general workaround?

If your Cisco switch is constantly dropping you from the Internet, the following will help you find the answers to these questions.

After the Flash space shortage information appeared in the Cisco switch, I specifically inquired about the hardware configuration of the 6509 core device, the default 6509 standard configuration of Flash is 64MB, the standard iOS size is , and the iOS size of the version to be upgraded is, so it seems that the lack of space is inevitable. But this problem is still relatively easy to solve, delete the original ios in flash and then upload it. So enter the command:

router#

And then pass it on. Prompt message is still not enough space! At this time, the ios of the switch has been deleted by me, and if you accidentally lose power or restart, the switch will not get up.

In the management interface, use the show command to see, the ios file is gone, but the space is still more than 30 megabytes, that is, the flash has not been emptied.

At this time, I remembered that in the past, I had to restart the switch to take effect after deleting the file, but now it is absolutely impossible to restart. What to do? Go to Cisco** to find useful information,Finally, I found a command squeeze,The command is to completely empty the deleted files,It's like emptying the **site.。

Run: router squeeze sup-bootflash: and then use the show command to check, and find that the flash has been completely emptied, and the free space is 64MB. At this time, you will use FTP to upload, and you will see a success message on the screen after a few minutes.

reload a bit and use the show flash command to see that the ios version has become 122(17a)sx。Plug in the new module ws-x6548-ge-tx and try it, everything is ok, the new module can run normally.

Think twice when deleting, if you take it for granted that if you reload after deleting the flash, the switch will not boot, and the consequences will be very serious. Stop and think for 30 seconds before the operation, which can often reduce a lot of unnecessary losses.

1. Power failure.

To do a good job of external power supply, it is generally necessary to provide independent power supply by introducing independent power lines, and adding voltage regulators to avoid instantaneous high or low voltage phenomena.

If conditions permit, you can add an uninterruptible power supply to ensure the normal power supply of the switch, some provide voltage stabilization function, and some do not, pay attention when choosing. Set up professional lightning protection measures in the equipment room to prevent lightning damage to the switch.

2. Cable failure.

In actual use, cable faults often cause the switch system or port to not work properly, so this kind of fault is also classified as a switch hardware failure. For example, the connector is not tightly plugged in, the sequence of cables is wrong or not standardized, the cable connection should be crossed but the straight connection is used, the two optical fibers in the optical cable are staggered, and the wrong line connection leads to network loops.

3. Module failure.

A switch is composed of many modules, such as stacking modules, management modules (control modules), and expansion modules. The chances of these modules failing are very small, but if they do occur, they can be financially costly.

Such failures can occur if the module is plugged and unplugged carelessly, or if the switch is transported in a collision, or if the power supply is unstable.

4. Port failure.

In most cases, a port fault is when one or more ports are damaged. Therefore, after troubleshooting the computer connected to the port, you can determine whether it is damaged by replacing the connected port. In case of such failures, you can try to clean the port with an alcohol cotton ball after the power is turned off, and if the port is indeed damaged, then the port can only be replaced.

5. Backplane failure.

In the case of normal power supply of external power supply, if the internal modules of the switch are not working normally, it may be that the backplane is broken, even if the electrical maintenance engineer encounters this situation, I am afraid that the only way is to replace the backplane.