Service Manual

● The OS image verification feature is supported for images stored in the local system only.
● The OS image verification feature is not supported when the fastboot or the warmboot features are enabled on the system.
● If OS image verification fails after a reload, the system does not load the startup configuration. The System displays an
appropriate error message until the no verified boot command is used on the system.
● After you enable The OS image verification feature, the system prompts you to enter The OS image hash when you upgrade
the Dell EMC Networking OS to a later version. The system checks if your hash matches with The OS image hash only after
reloading.
● After enabling The OS image verification feature, use the verified boot hash command to verify and store the hash
value. If you don’t store the hash value, you cannot reboot the device until you verify The OS image hash.
Enabling and Configuring OS Image Hash Verification
To enable and configure Dell EMC Networking OS image hash verification, follow these steps:
1. Enable the OS image hash verification feature.
CONFIGURATION mode
verified boot
2. Verify the hash checksum of the current OS image file on the local file system.
EXEC Privilege
verified boot hash system-image {A: | B:} hash-value
You can get the hash value for your hashing algorithm from the Dell EMC iSupport page. You can use the MD5, SHA1, or
SHA256 hash and the Dell EMC Networking OS automatically detects the type of hash.
NOTE: The verified boot hash command is only applicable for OS images in the local file system.
3. Save the configuration.
EXEC Privilege
copy running-configuration startup-configuration
After enabling and configuring OS image hash verification, the device verifies the hash checksum of the OS boot image during
every reload.
DellEMC# verified boot hash system-image A: 619A8C1B7A2BC9692A221E2151B9DA9E
Image Verification for Subsequent OS Upgrades
After enabling OS image hash verification, for subsequent Dell EMC Networking OS upgrades, you must enter the hash
checksum of the new OS image file. To enter the hash checksum during upgrade, follow these steps:
● Use the following command to upgrade the Dell EMC Networking OS and enter the hash value when prompted.
EXEC Privilege
upgrade system
DellEMC# upgrade system tftp://10.16.127.35/FTOS-SE-9.11.0.1 A:
Hash Value: e42e2548783c2d5db239ea2fa9de4232
!!!!!!!!!!!!!!...
Startup Configuration Verification
Dell EMC Networking OS comes with startup configuration verification feature. When enabled, it checks the integrity of the
startup configuration that the system uses while the system reboots and loads only if it is intact.
Important Points to Remember
● The startup configuration verification feature is disabled by default on the Dell EMC Networking OS.
● The feature is supported for startup configuration files stored in the local system only.
● The feature is not supported when the fastboot or the warmboot features are enabled on the system.
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