Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 52)

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Using Hashes to Validate Software Images

You can use the MD5 message-digest algorithm or SHA256 Secure Hash Algorithm to validate the

software image on the flash drive, after the image has been transferred to the system, but before the

image has been installed. The validation calculates a hash value of the downloaded image file on system’s

flash drive, and, optionally, compares it to a Dell Networking published hash for that file.

The MD5 or SHA256 hash provides a method of validating that you have downloaded the original

software. Calculating the hash on the local image file, and comparing the result to the hash published for

that file on iSupport, provides a high level of confidence that the local copy is exactly the same as the

published software image. This validation procedure, and the verify {md5 | sha256} command to support

it, can prevent the installation of corrupted or modified images.

The verify {md5 | sha256} command calculates and displays the hash of any file on the specified local

flash drive. You can compare the displayed hash against the appropriate hash published on i-Support.

Optionally, the published hash can be included in the verify {md5 | sha256} command, which will display

whether it matches the calculated hash of the indicated file.

To validate a software image:

1. Download Dell Networking OS software image file from the iSupport page to the local (FTP or TFTP)

server. The published hash for that file is displayed next to the software image file on the iSupport

page.

2. Go on to the Dell Networking system and copy the software image to the flash drive, using the copy

command.

3. Run the verify {md5 | sha256} [ flash://]img-file [hash-value] command. For example, verify sha256

flash://FTOS-SE-9.5.0.0.bin

4. Compare the generated hash value to the expected hash value published on the iSupport page.

To validate the software image on the flash drive after the image has been transferred to the system, but

before the image has been installed, use the verify {md5 | sha256} [ flash://]img-file [hash-value]

command in EXEC mode.

• md5: MD5 message-digest algorithm

• sha256: SHA256 Secure Hash Algorithm

• flash: (Optional) Specifies the flash drive. The default is to use the flash drive. You can just enter the

image file name.

• hash-value: (Optional). Specify the relevant hash published on i-Support.

• img-file: Enter the name of the Dell Networking software image file to validate

Examples: Without Entering the Hash Value for Verification

MD5

Dell# verify md5 flash://FTOS-SE-9.5.0.0.bin

MD5 hash for FTOS-SE-9.5.0.0.bin: 275ceb73a4f3118e1d6bcf7d75753459

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