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Flash.chat.4.5.7 Download
These switches run their software from RAM, after they load the software image from a Flash device. If all Flash images get corrupted or deleted, the switch cannot boot properly. In this condition, the switch generally falls back into a ROM monitor (ROMmon) mode, which has limited feature capability. This document explains how to download a new image and recover the switch from this situation.
A boot from the network (TFTP) server allows you to download an image from a TFTP server directly into RAM, where the Supervisor Engine can run the image. This procedure does not create any files on the Flash system. The procedure only allows you bring up your switch and perform a normal software download.
The upgrade procedure for these Supervisor Engines is fairly safe. First, a new image is copied into the Supervisor Engine RAM, where the image checksum is verified. If this image is declared valid, the image is then programmed into the Flash, which overwrites the previous image. If an error occurs during the download from the TFTP server, for instance, the current image in Flash is not modified. The corruption of images on these Supervisor Engines happens rarely. The corruption is often related to a problem on the Flash itself. Or a problem that occurs during the Flash programming process can cause the corruption.
You can download an image to the Supervisor Engine without a TFTP server, directly through the console connection, if you use the Kermit protocol. Refer to the Preparing to Download an Image Using Kermit section of Working with System Software Images for more information. This method can be useful if you cannot get any port to be recognized on the switch during the recovery procedure. However, this method is much slower than the method in the Recovery Procedure section. Avoid the Kermit method, if possible.
If you have a Supervisor Engine IIIF or if a Flash PC Card (PCMCIA) is not available, the only alternate recovery procedure is an Xmodem download via the console port. This feature is only available if you have ROMmon version 5.1(1) or later. If you cannot use the console download, the only possibility left is to replace the Supervisor Engine.
The most simple way to check whether this console download procedure is available to you is to attempt the download. The feature is not currently documented, but it works in exactly the same way as it does for Cisco routers that are in ROMmon.
This example is the log of a console session during a console download on a Supervisor Engine III. The console speed is 38,400 bits per second (bps). The command is xmodem, with option -s. The command is self-explanatory. However, see the Xmodem Options Summary section of this document if you want more information on the available options.
Caution: At this point, the image that has been downloaded has not been savedin bootflash. This output provides an example. The 4.5(7) software wasdownloaded via the console, and you can see that the image has not yet beenstored in Flash:
The example in this section is the log of a console session during a console download on a Supervisor Engine II. The console speed is 38,400 bps. The command is xmodem, with option -s. The command is self-explanatory. However, see the Xmodem Options Summary section of this document if you want more information on the available options.
Caution: At this point, the image that has been downloaded has not been savedin bootflash. The 6.3(3) software was downloaded via the console, and you cansee in this output that the image has not yet been stored in Flash: 2ff7e9595c
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