Users Guide

Dell PowerConnect W-Series ArubaOS 6.1 | User Guide Management Access | 605
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Clock Synchronization
You can use NTP to synchronize the controller to a central time source. Configure the controller to set its system
clock using NTP by configuring one or more NTP servers.
For each NTP server, you can optionally specify the NTP iburst mode for faster clock synchronization. The iburst
mode sends up ten queries within the first minute to the NTP server. (When iburst mode is not enabled, only one
query is sent within the first minute to the NTP server.) After the first minute, the iburst mode typically
synchronizes the clock so that queries need to be sent at intervals of 64 seconds or more.
In the WebUI
1. Navigate to the Configuration > Management > Clock page.
2. Under NTP Servers, click Add.
3. Enter the IP address of the NTP server.
4. Select (check) the iburst mode, if desired.
5. Click Add.
In the CLI
ntp server ipaddr [iburst]
Configuring NTP Authentication
The Network Time Protocol adds security to an NTP client by authenticating the server before synchronizing the
local clock. NTP authentication works by using a symmetric key which is configured by the user. The secret key is
shared by both the Dell controller and an external NTP server. This helps identify secure servers from fraudulent
servers.
In the WebUI
1. Navigate to the Configuration > Management > Clock page.
2. Under NTP Authentication, make sure Enable is selected. Enable is the default.
3. Under NTP Servers, enter the NTP server IP address in the NTP Server Address field.
4. Under NTP Identification Keys, enter an identification key in the Identification Key field. Then add a secret
string in the Md5 Secret field. The secret string must be numeric characters between 1 to 65535.
5. Click Add.
6. The identification key along with its corresponding Md5 secret string display in the NTP Identification Keys
section.
NOTE: The iburst mode is a configurable option and not the default behavior for the controller, as this option is considered
“aggressive” by some public NTP servers. If an NTP server is unresponsive, the iburst mode continues to send frequent queries
until the server responds and time synchronization starts.