介绍两种恢复CISCO IOS的方法

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如果您的器的flash因为意外丢失了IOS，您可以在ROM monitor commands模式下通过如下两种办法恢复:

1) xmodem—Use this if the computer attached to your console has a terminal emulator that has xmodem capability.
2) tftpdnld—Use this if you have a TFTP server directly connected to the Ethernet 0 port.

Using the xmodem Command
The xmodem command establishes a connection between a console and the router console port for disaster recovery if both the boot and system images are erased from Flash memory.
xmodem [filename]—Establishes an xmodem connection between the console and the router. The optional parameter filename specifs the source file containing the Cio IOS image.
Other options include the following:
·-c—use cyclic redundancy check (CRC-16)
·-y—use Ymodem transfer protocol
·-r—copy the image to DRAM for launch
·-x—do not launch image on completion of download

Using the tftpdnld Command
The tftpdnld command downloads a Cio IOS software image from a remote server into Flash memory using TFTP.
tftpdnld—Begins the TFTP copy command.
The following variables are required:
·IP_ADDRESS—The IP address for the router you are using.
·IP_SUBNET_MASK—The subnet mask for the router you are using.
·DEFAULT_GATEWAY—The default gateway for the router you are using.
·TFTP_SERVER—The IP address of the server from which you want to download the image file.
·TFTP_FILE—The name of the file that you want to download.
·The following variables are optional:
·TFTP_VERBOSE—Print setting. 0=qut, 1=progress, 2=verbose. The default is 1.
·TFTP_RETRY_COUNT—Retry count for  and TFTP. The default is 7.
·TFTP_TIMEOUT—Overall timeout of the download operation in seconds. The default is 2400 seconds.
·TFTP_CHECKSUM—Performs a checksum test on the imag
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