AP NTP Association

The interaction between an access point and its dedicated external NTP server resource constitutes an NTP Association. NTP associations can be either peer associations (the access point synchronizes to another system or allows another system to synchronize to it), or server associations (only the access point synchronizes to the NTP resource, not the other way around).

To view the access point's NTP association statistics:

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 an RF Domain node, select a controller or service platform, and select one of its connected access points. The access point's statistics menu displays in the right-hand side of the screen, with the Health tab selected by default.
4. Select the Network Time menu.
5. Select the NTP Association tab.

   

   The Statistics > AP > Network Time > NTP Association screen displays.

   

   

   This screen displays the following:

   Delay Time	Displays the round-trip delay (in seconds) for broadcasts between the NTP server and the access point.
   Display	Displays the time difference between the peer NTP server and the access point's clock.
   Offset	Displays the calculated offset between the access point and the NTP server. The access point adjusts its clock to match the server's time value. The offset gravitates towards zero, 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 address of the time source the access point is synchronized to.
   Server IP Address	Displays the numerical IP address of the SNTP resource (server) providing SNTP updates to the access point.
   State	Displays the NTP association status. This 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 how many hops the access point is from its current NTP time source.
   Time	Displays the time of the last statistics update.

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