Inaccurate or no data displayed in analytics time series graph

Symptom

The time series graph of a monitor is missing expected data, has data shown with inaccurate times, or incorrect data.

For example, a chart that graphs when a port goes down shows a port as up when it is down, does not show any state for the port, or shows the event as happening at a time that does not match the actual event--such as in future.

Solution 1

Cause

The switch and the client from which you are viewing the UI are not set to the same time. For example, instead of using Coordinated Universal Time (UTC) with a time zone offset or getting the time from an NTP server, either the switch or the client is manually set to a different time.

Action

Try clearing or resetting the web client browser cache.
Ensure that the web client from which you are viewing Web UI is set to a time zone based on UTC.
For example, if your workstation is set to Eastern Standard Time (EST), and you want to use Pacific Standard Time (PST), change the time by setting the time zone instead of by manually resetting the time.
Ensure that the switch is set to use NTP or to a time zone based on UTC time.
- NTP synchronizes the time of day among a set of distributed time servers and clients to correlate events when receiving system logs and other time-specific events from multiple network devices. All NTP communications use Coordinated Universal Time (UTC).
  
  To show the NTP status, use the show ntp status command.
- For information about configuring the switch to use NTP, see the Fundamentals Guide.
After you configure the switch, clear the NAE data by entering the clear nae-data command from the manager context.

For example:
```
switch# clear nae-data
```
If the switch is set to use NTP and there has been a significant clock change, clear the NAE data by using the clear nae-data command.
For example:
```
switch# clear nae-data
```

Solution 2

Cause

The switch operating system software was updated to a different software release.

Action

Clear the NAE data by entering the clear nae-data command from the manager context.
For example:
```
switch# clear nae-data
```
Examine the alerts for agent or script errors.
Ensure that the scripts loaded on the switch support the software release installed on the switch.
If a script does not support the current software release, delete the script and upload the replacement script.
After you upload replacement scripts, clear the NAE data again by entering the clear nae-data command from the manager context.