Configuring Symmetric Keys - Motorola RFS7000 Series System Reference Manual

5-26 Switch Services
Clock Stratum
Listen to NTP
Broadcasts
Broadcast Delay
Auto Key
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.

5.3.2 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 switch and its time resource.
To review existing Symmetric Key configurations, and (if necessary) add a new one:
1. Select Services
Define how many hops (from 1 to 15) the switch is from a SNTP
time source. The switch automatically chooses the SNTP resource
with the lowest stratum number. The SNTP supported switch is
careful to avoid synchronizing to a server that may not be accurate.
Thus, the SNTP enabled switch never synchronizes to a machine
not synchronized itself. The SNTP enabled switch 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.
Select this checkbox to allow the switch to listen over the network
for SNTP broadcast traffic. Once enabled, the switch and the SNTP
broadcast server must be on the same network.
Enter the estimated round-trip delay (between 1 and 999999
seconds) for SNTP broadcasts between the SNTP broadcast server
and the switch. 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 switch to
within a millisecond of the SNTP broadcast server.
Use the Auto Key drop-down menu to specify whether the
key is disabled, enabled only on the host or enabled only on the
client.
> Secure NTP from the main menu tree.