Brocade Mobility RFS Controller System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 892)

880 Brocade Mobility RFS Controller System Reference Guide
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The NTP Associations screen provides the controller or service platform’s current NTP associations:
Smart Caching
Controller Statistics
Smart Caching is used on NX4500 and NX6500 series service platforms to temporarily store
frequently accessed Web content (Web pages, graphics, audio and video files etc.). When the
content is requested, its retrieved from a local content cache and not from the origin server. Smart
caching results in reduced bandwidth usage, lower latency periods and reduced data transfers
from the origin servers.
For more information, see:
• Smart Caching Utilization
• Smart Caching Content Types
• Smart Caching Active Requests
• Smart Caching Client List
Smart Caching Utilization
Smart Caching
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 or service platform and the SNTP server. The
controller or service platform 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 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.
State Displays the NTP association status. The state can be one of the following:
•
Synced – Indicates the wireless controller is synchronized to this NTP server.
•
Unsynced – Indicates the wireless controller 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 wireless
controller chooses a master to synchronize with.
•
Candidate – Indicates this NTP master server may be considered for selection the next time
the wireless controller 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.
Refresh Select the Refresh button to update the screen’s statistics counters to their latest values