Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

To validate the software image on the flash drive, you can use the MD5 message-digest algorithm or SHA256 Secure Hash Algorithm, after the image is transferred to the system but before the image is 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, prevents 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 iSupport. Optionally, you can include the published hash in the verify {md5 | sha256} command, which displays 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 displays 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 is transferred to the system, but before you install the image, 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 uses the flash drive. You can enter the image file name.

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

• 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
                                 
                                 
                              

Dell# verify sha256 flash://FTOS-SE-9.5.0.0.bin
                                 SHA256 hash for FTOS-SE-9.5.0.0.bin: e6328c06faf814e6899ceead219afbf9360e986d692988023b749e6b2093e933
                                 
                              

Examples: Entering the Hash Value for Verification

Dell# verify md5 flash://FTOS-SE-9.5.0.0.bin 275ceb73a4f3118e1d6bcf7d75753459
                                 MD5 hash VERIFIED for FTOS-SE-9.5.0.0.bin
                                 
                              

Dell# verify sha256 flash://FTOS-SE-9.5.0.0.bin e6328c06faf814e6899ceead219afbf9360e986d692988023b749e6b2093e933
                                 SHA256 hash VERIFIED for FTOS-SE-9.5.0.0.bin