Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide, Cisco IOS XE Cupertino 17.9.x

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Updated:
March 8, 2023

Chapter: Real-Time Access Points Statistics

Real-Time Access Points Statistics

Information About Access Point Real-Time Statistics

From Cisco IOS XE Bengaluru 17.5.1 onwards, you can track the CPU utilization and memory usage of an AP, and monitor the health of an AP, by generating real-time statistics for an AP.

SNMP traps are defined for CPU and memory utilization of APs and the controller. An SNMP trap is sent out when the threshold is crossed. The sampling period and statistics interval can be configured using SNMP, YANG, and CLI.

Statistics interval is used to process the data coming from an AP, and the average CPU utilization and memory utilization is computed over time. You can also configure an upper threshold for these statistics. When a statistic value surpasses the upper threshold, an alarm is enabled, and an SNMP trap is triggered.

From Cisco IOS XE Cupertino 17.7.1 release onwards, for radio monitoring, you can reset the radios based on the statistics sent by the AP for a sampling period. When you configure the radios in the controller, if there is no increment in the Tx or Rx statistics when the radio is up, then the radio reset is triggered.

Feature History for Real Time Access Point Statistics

This table provides release and related information for the feature explained in this module.

Table 1. Feature History for Real Time Access Point Statistics

Release

Feature

Feature Information

Cisco IOS XE Cupertino 17.7.1

Real Time Access Point Statistics

This feature is enhanced with the implementation of AP threshold values between 0 and 50 to trigger an alarm.

Restrictions for AP Radio Monitoring Statistics

You cannot reset the radio firmware from the controller. The controller will shut and unshut the radio if the Rx or Tx count is not incremented for a radio slot in a specified period.

Configuring Access Point Real Time Statistics (GUI)

Procedure

Step 1

Choose Configuration > Tags & Profiles > AP Join.

Step 2

Click Add. The Add AP Join Profile page is displayed.

Step 3

Under the AP tab, click the AP Statistics tab.

Step 4

In the System Monitoring section:

  1. Enable Monitor Real Time Statistics to get calculated statistics and alarms of the AP.

  2. To receive an alarm when the upper threshold is surpassed for parameters such as CPU utilization and memory, enable Trigger Alarm for AP.

  3. Enter the threshold percentage for CPU and memory usage in the CPU Threshold to Trigger Alarm field and Memory Threshold to Trigger Alarm fields, respectively. The valid range is between 0 to 50. An SNMP trap is sent out when this threshold is crossed.

  4. In the Interval to Hold Alarm field, enter the time for which the alarm is held before it gets triggered. The valid range is between 0 and 3600 seconds.

  5. In the Trap Retransmission Time field, enter the time between retransmissions of the alarm. The valid range is between 0 and 65535 seconds.

  6. To define how often data should be collected from the AP, enter a value in the Sampling Interval field. The valid range is between 720 and 3600 seconds.

  7. To define the interval at which AP statistics are to be calculated, enter a value in the Statistics Interval field. The valid range is between 2 and 900 seconds.

  8. To automatically reload the AP when there is high CPU and memory usage in the defined sampling interval, select the Reload the AP check box.

Step 5

Under the Radio Monitoring section:

  1. Select the Monitoring of AP Radio stuck check box to verify that the Tx and Rx statistics of the AP are updated each time the payloads are coming in from the AP to the controller.

  2. To generate an alarm for the radio of the AP when there is no increment in the Tx and RX statistics for the payloads, select the Alarms for AP Radio stuck check box.

  3. Select the Reset the stuck AP Radio check box to recover the radio from the bad state. A radio admin state payload will be sent from the controller to toggle the radio and the radio will be shut when there is no increment in the Tx and Rx statistics.

  4. To define how often data should be collected from the radio, enter a value in the Sampling Interval field. The valid range is between 720 and 3600 seconds.

Step 6

Click Apply to Device to save the configuration.

Configuring Real-Time Access Point Statistics (CLI)

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 2

ap profile ap-profile-name

Example:

Device(config)# ap profile doc-test

Configures the AP profile. The default AP join profile name is default-ap-profile.

Step 3

stats-timer frequency

Example:

Device(config-ap-profile)# stats-timer 60

(Optional) Configures the statistics timer. This command is used to change the frequency of the statistics reports coming from the AP. The valid values range between 0 and 65535 seconds.

Step 4

statistics ap-system-monitoring enable

Example:

Device(config-ap-profile)# statistics ap-system-monitoring enable

(Optional) Enables monitoring of AP real-time statistics (CPU and memory).

Step 5

statistics ap-system-monitoring alarm-enable

Example:

Device(config-ap-profile)# statistics ap-system-monitoring alarm-enable

Enables alarms for AP real-time statistics (CPU and memory).

Step 6

statistics ap-system-monitoring alarm-hold-time duration

Example:

Device(config-ap-profile)# statistics ap-system-monitoring alarm-hold-time 400

Defines the alarms for AP real-time statistics (CPU and Memory). The valid values range between 0 and 3600 seconds.

Step 7

ap-system-monitoring alarm-retransmit-time duration

Example:

Device(config-ap-profile)# ap-system-monitoring alarm-retransmit-time 100

Defines the interval between retransmissions of the trap alarm. The valid values range between 0 and 65535 seconds.

Step 8

statistics ap-system-monitoring cpu-threshold percentage

Example:

Device(config-ap-profile)# statistics ap-system-monitoring cpu-threshold 30

Defines the threshold for CPU usage on the AP (percentage) to trigger alarms.

Note

 

From Cisco IOS XE Cupertino 17.7.1 release onwards, the valid threshold value for CPU on the AP to trigger the alarms is between 0 and 50.

Step 9

ap-system-monitoring mem-threshold percentage

Example:

Device(config-ap-profile)# ap-system-monitoring mem-threshold 40

Defines the threshold for memory usage on AP to trigger alarms. The percentage of threshold for memory usage on the AP to trigger is between 0 and 100.

Note

 

From Cisco IOS XE Cupertino 17.7.1 release onwards, the valid threshold value for memory usage on the AP to trigger the alarms is between 0 and 50.

Step 10

ap-system-monitoring sampling-interval duration

Example:

Device(config-ap-profile)# statistics ap-system-monitoring sampling-interval 600

(Optional) Defines the sampling interval. The valid values range between 2 and 900 seconds.

Step 11

exit

Example:

Device(config-ap-profile)# exit

Exits from AP profile configuration mode and returns to global configuration mode.

Step 12

trapflags ap ap-stats

Example:

Device(config)# trapflags ap ap-stats

Enables sending AP-related traps. Traps are sent when statistics exceed the configured threshold.

Example


    Device(config)# ap profile default-policy-profile
    Device(config-ap-profile)# statistics ap-system-monitoring enable
    Device(config-ap-profile)#statistics ap-system-monitoring sampling-interval 90
    Device(config-ap-profile)#statistics ap-system-monitoring stats-interval 120
    Device(config-ap-profile)#statistics ap-system-monitoring alarm-enable
    Device(config-ap-profile)#statistics ap-system-monitoring alarm-hold-time 3
    Device(config-ap-profile)#statistics ap-system-monitoring alarm-retransmit-time 10
    Device(config-ap-profile)#statistics ap-system-monitoring cpu-threshold 90
    Device(config-ap-profile)#statistics ap-system-monitoring mem-threshold 90
    Device(config)# trapflags ap ap-stats

Configuring AP Radio Monitoring Statistics

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 2

ap profile profile-name

Example:

Device(config)# ap profile test1

Configures an AP profile and enters the AP profile configuration mode.

Step 3

statistic ap-radio-monitoring enable

Example:

(config-ap-profile)#statistic ap-radio-monitoring enable

Enables the monitoring of AP radio stuck statistics.

Step 4

statistic ap-radio-monitoring alarm-enable

Example:

(config-ap-profile)#statistic ap-radio-monitoring alarm-enable

(Optional) Enables the alarm for AP radio stuck statistics.

Step 5

statistic ap-system-monitoring action reload-ap interval duration

Example:

(config-ap-profile)# statistic ap-radio-monitoring action reload-ap interval850

(Optional) Specifies the sampling interval in seconds. The valid values range between 720 and 3600 seconds.

Step 6

statistic ap-radio-monitoring action radio-reset

Example:

(config-ap-profile)# statistic ap-radio-monitoring action radio-reset

(Optional) Generates an alarm and resets the radio if the radio is stuck.

Step 7

statistic ap-system-monitoring action reload-ap

Example:

(config-ap-profile)# statistic ap-system-monitoring action reload-ap

Reloads the AP.

Example


    Device(config)# ap profile test1
    Device(config-ap-profile)# statistics ap-radio-monitoring enable
    Device(config-ap-profile)#statistic ap-radio-monitoring alarm-enable
    Device(config-ap-profile)#statistic ap-radio-monitoring sampling-interval 750
    Device(config-ap-profile)# statistic ap-radio-monitoring action radio-reset
    Device(config-ap-profile)#statistic ap-system-monitoring action reload-ap

Monitoring Access Point Real-Time Statistics (GUI)

Procedure

Step 1

Choose Monitoring > Wireless > AP Statistics.

Step 2

Click the General tab.

Step 3

Click an AP name. The General window is displayed.

Step 4

To view the AP Statistics data, click the AP Statistics tab.

The following information is displayed:

  • Memory alarm last send time: Displays the time of the last memory trap sent.

  • Memory Alarm Status: Displays the state of the memory alarm. An alarm can be ACTIVE, INACTIVE, INACTIVE_SOAKING, ACTIVE_SOAKING. An alarm is soaked until the configured hold time has passed.

  • Memory alarm raise time: Displays the last time the memory alarm was active.

  • Memory alarm clear time: Displays the last time the memory alarm was inactive.

  • Last statistics received: Displays the time of the last statistics report received from the AP.

  • Current CPU Usage: Displays the latest percentage of CPU usage reported.

  • Average CPU Usage: Displays the average CPU usage calculated.

  • Current Memory Usage: Displays the latest percentage of memory usage reported.

  • Average Memory Usage: Displays the average memory usage calculated.

  • Current window size: Displays the window size. The window size is calculated by dividing the statistics interval by the sampling interval. The average CPU and memory usage is calculated by the window size.

  • CPU alarm last send time: Displays the time of the last CPU trap sent.

  • CPU Alarm Status: Displays the state of the CPU alarm. An alarm can be ACTIVE, INACTIVE, INACTIVE_SOAKING, ACTIVE_SOAKING. An alarm is soaked until the configured hold time has passed.

  • CPU alarm raise time: Displays the last time the CPU alarm was active.

  • CPU alarm clear time: Displays the last time the CPU alarm was inactive.

Step 5

Click OK.

Verifying Access Point Real-Time Statistics

To verify AP real-time statistics, run the show ap config general | section AP statistics command: 

Device# show ap config general | section AP statistics
!Last Statistics 
AP statistics : Enabled
Current CPU usage : 4
Average CPU usage : 49
Current memory usage : 35
Average memory usage : 35
Last statistics received : 03/09/2021 15:25:08
!Statistics Configuration
Current window size : 1
Sampling interval : 30
Statistics interval : 300
AP statistics alarms : Enabled
!Alarm State - Active, Inactive, Inactive_Soaking, Inactive_Soaking
Memory alarm status : Active
Memory alarm raise time : 03/09/2021 15:24:29
Memory alarm clear time : NA
Memory alarm last send time : 03/09/2021 15:24:59
CPU alarm status : Inactive
CPU alarm raise time : 03/09/2021 15:24:25
CPU alarm clear time : 03/09/2021 15:25:05
CPU alarm last send time : 03/09/2021 15:25:05
!Alarm Configuration
Alarm hold time : 6
Alarm retransmission time : 30
Alarm threshold cpu : 30
Alarm threshold memory : 32

To verify the statistics reporting period, run the show ap config general | i Stats Reporting Period command: 

Device# show ap config general | i Stats Reporting Period
Stats Reporting Period : 10

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