Verify - Cisco 4500M Command Reference Manual

Chapter2 Cisco IOS Commands for the Catalyst 4500 Series Switches

verify

To verify the checksum of a file on a Flash memory file system, use the verify command.
Syntax Description
/md5
flash-filesystem:
filename
expected-md5-signature
Defaults
The current working device is specified.
Command Modes
Privileged EXEC
Command History Release
12.1(8a)EW
Usage Guidelines
Each software image that is distributed on disk uses a single checksum for the entire image. This
checksum is displayed only when the image is copied into Flash memory.
The Readme file, which is included with the image on the disk, lists the name, file size, and checksum
of the image. Review the contents of the Readme file before loading or duplicating the new image so that
you can verify the checksum when you copy it into Flash memory or on to a server.
Use the verify /md5 command to verify the MD5 signature of a file before using it. This command
validates the integrity of a copied file by comparing a precomputed MD5 signature with the signature
computed by this command. If the two MD5 signatures match, the copied file is identical to the original
file.
You can find the MD5 signature posted on the Cisco.com page with the image.
You can use the verify /md5 command in one of the following ways:
•
•
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verify [/md5] [flash-filesystem:] [filename] [expected-md5-signature ]
(Optional) Verifies MD5 signatures.
(Optional) Device where the Flash resides; valid values are bootflash:,
slot0:, flash:, or sup-bootflash:.
(Optional) Name of the Cisco IOS image.
(Optional) MD5 signature.
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Verify the MD5 signatures manually by entering the verify /md5 filename command.
Check the displayed signature against the MD5 signature posted on the Cisco.com page.
Allow the system to compare the MD5 signatures by entering the verify /md5
{flash-filesystem:filename} {expected-md5-signature} command.
After completing the comparison, the system returns with a verified message. If an error is detected,
the output is similar to the following:
Switch# verify /md5 slot0:c4-jsv-mz 0f
..................................
..................................
..................................
..................................
Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
verify
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