Verify Software Images Before InstallationTo validate the software image on the flash drive, you can use the MD5 message-digest algorithm or SHA256 Secure Hash Algorithm, afterthe image is transferred to the system but before the image is installed. The validation calculates a hash value of the downloaded image fileon 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 thelocal image file and comparing the result to the hash published for that file on iSupport provides a high level of confidence that the localcopy is exactly the same as the published software image. This validation procedure, and the verify {md5 | sha256} command tosupport 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 cancompare the displayed hash against the appropriate hash published on iSupport. Optionally, you can include the published hash in theverify {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 forthat 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 sha256flash://FTOS-SE-9.5.0.0.bin4 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 theverify {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 validateExamples: Without Entering the Hash Value for VerificationMD5Dell# verify md5 flash://FTOS-SE-9.5.0.0.binMD5 hash for FTOS-SE-9.5.0.0.bin: 275ceb73a4f3118e1d6bcf7d75753459SHA256Dell# verify sha256 flash://FTOS-SE-9.5.0.0.binSHA256 hash for FTOS-SE-9.5.0.0.bin:e6328c06faf814e6899ceead219afbf9360e986d692988023b749e6b2093e933Examples: Entering the Hash Value for VerificationMD5Dell# verify md5 flash://FTOS-SE-9.5.0.0.bin 275ceb73a4f3118e1d6bcf7d75753459MD5 hash VERIFIED for FTOS-SE-9.5.0.0.bin56 Getting Started
