Summit WM3000 Series Controller System Reference Guide 261
5 Click Apply to save changes to the screen. Navigating away from the screen without clicking the
Apply button results in all the changes to the screen being discarded.
6 Click the Revert button to undo the changes to the screen and revert to the last saved configuration.
Configuring Symmetric Keys
Symmetric keys are algorithms for cryptography that use trivially related cryptographic keys for both
decryption and encryption. The encryption key is related to the decryption key, as they may be identical
or there is a simple mechanism to go between keys. The keys represent a shared secret between the
controller and its time resource.
To review existing Symmetric Key configurations, and (if necessary) add a new one:
1 Select Services > Secure NTP from the main menu tree.
2 Select the Symmetric Keys tab.
Clock Stratum
Define how many hops (from 1 to 15) the controller is from a SNTP time
source. The controller automatically chooses the SNTP resource with the
lowest stratum number. The SNTP supported controller is careful to avoid
synchronizing to a server that may not be accurate. Thus, the SNTP
enabled controller never synchronizes to a machine not synchronized
itself. The SNTP enabled controller compares the time reported by several
sources, and does not synchronize to a time source whose time is
significantly different than others, even if its stratum is lower.
Listen to NTP
Broadcasts
Select this checkbox to allow the controller to listed over the network for
SNTP broadcast traffic. Once enabled, the controller and the SNTP
broadcast server must be on the same network.
Broadcast Delay
Enter the estimated round-trip delay (between 1 and 999999 seconds)
for SNTP broadcasts between the SNTP broadcast server and the
controller. Define the interval based on the priority of receiving accurate
system time frequently. Typically, no more than one packet per minute is
necessary to synchronize the controller to within a millisecond of the
SNTP broadcast server.
Auto Key
Use use an
Auto Key drop-down menu to specify whether the key is
disabled, enabled only on the host or enabled only on the client.
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