Extreme Networks Summit WM3000 Series Reference Manual page 262

Controller Services
3 Refer to the Symmetric Key screen to view the following information.
Key ID
Key Value
Trusted Key
4 Select an existing key and click the Delete button to permanently remove it from the list of Key IDs.
5 Click the Add button to create a new Symmetric Key that can be used by the controller.
CAUTION
After an NTP synchronization using a Symmetric Key, the NTP status will not automatically be update.
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Displays a Key ID between 1-65534. The Key ID is a abbreviation
allowing the controller to reference multiple passwords. This makes
password migration easier and more secure between the controller and its
NTP resource.
Displays the authentication value used to secure the credentials of the
server providing system time to the controller.
If a checkmark appears, a trusted key has been associated with a domain
name. A trusted key is added when a public key is known, but cannot be
securely obtained. Adding the trusted key allows information from the
server to be considered secure. The authentication procedures requires
both the local and remote servers share the same key and key identifier.
Therefore, using key information from a trusted source is important.
Summit WM3000 Series Controller System Reference Guide