NTP Association

The interaction between the controller or service platform and a SNTP server constitutes an association. SNTP associations can be either peer associations (a controller or service platform synchronizes to another system or allows another system to synchronize to it), or a server associations (only the controller or service platform synchronizes to the SNTP resource, not the other way around).

To view the controller or service platform's NTP associations:

1. Select the Statistics menu from the Web UI.
2. Expand the System node from the navigation pane (on the left-hand side of the screen). The System node expands to display the RF Domains created within the managed network.
3. Expand the RF Domain node.
4. Select a Wireless Controller.
5. Expand the Network Time and expand the menu to reveal its sub menu items.
6. Select NTP Association.
   The Statistics > Controller > Network Time > NTP Association screen displays.

   

   

   This screen provides the controller or service platform's current NTP associations:

   Delay Time	Displays the round-trip delay (in seconds) for SNTP broadcasts between the SNTP server and the controller or service platform.
   Display	Displays the time difference between the peer NTP server and the onboard wireless controller clock.
   Offset	Displays the calculated offset between the controller and the SNTP server. The controller adjusts its clock to match the server's time. The offset gravitates towards zero overtime, but never completely reduces its offset to zero.
   Poll	Displays the maximum interval between successive messages (in seconds) to the nearest power of two.
   Reach	Displays the status of the last eight SNTP messages. If an SNTP packet is lost, the lost packet is tracked over the next eight SNTP messages.
   Reference IP Address	Displays the IP address of the time source the controller or service platform is synchronized to.
   Server IP Address	Displays the numerical IP address of the SNTP resource (server) providing SNTP updates to the controller or service platform.
   State	Displays the NTP association status. The state can be one of the following: Synced – Indicates the controller or service platform is synchronized to this NTP server. Unsynced – Indicates the controller or service platform has chosen this master for synchronization. However, the master itself is not yet synchronized to UTC. Selected – Indicates this NTP master server will be considered the next time the controller or service platform chooses a new master to synchronize with. Candidate – Indicates this NTP master server may be considered for selection the next time the controller or service platform chooses a NTP master server. Configured – Indicates this NTP server is a configured server.
   Status	Displays the NTP peer's current status.
   Time	Displays the timestamp of the last NTP packet received from the NTP peer.

7. Select Refresh to update the screen's statistics counters to their latest values