Configuring Symmetric Keys - Brocade Communications Systems RFS6000 System Reference Manual

5
Configuring secure NTP
5. Click Apply to save changes to the screen. Navigating away from the screen without clicking the
6. Click the Revert button to undo the changes to the screen and revert to the last saved

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.
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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 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
Broadcasts
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
a key is disabled, enabled only on the host or enabled only on the client.
Apply button results in all the changes to the screen being discarded.
configuration.
Brocade Mobility RFS6000 and RFS7000 System Reference Guide
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