The capwap echo command sets the CAPWAP heartbeat detection interval and the number of CAPWAP heartbeat detections.
The undo capwap echo command restores the default CAPWAP heartbeat detection interval and the number of CAPWAP heartbeat detections.
By default, the CAPWAP heartbeat detection interval is 25s and the number of CAPWAP heartbeat detections is 6.
By default, If dual-link backup is enabled, the CAPWAP heartbeat detection interval is 25s and the number of CAPWAP heartbeat detections is 3.
capwap echo { interval interval-value | times times-value } *
undo capwap echo { interval | times }
Parameter |
Description |
Value |
|---|---|---|
interval interval-value |
Specifies the CAPWAP heartbeat detection interval, the interval at which two detection packets are sent. |
The value is an integer ranging from 20 to 300, in seconds. |
times times-value |
Specifies the number of CAPWAP heartbeat detections. If no response is received after the specified number of times, the link is considered disconnected. |
The value is an integer ranging from 3 to 120. |
Usage Scenario
As defined by CAPWAP, an AP and an AC send handshake packets periodically to maintain the data channel and management channel. If the AP does not receive packets from the AC within the heartbeat detection interval, it considers that the link between them is disconnected. Then the AP resets and releases its IP address, and reestablishes a link. If the AC does not receive packets from the AP within the heartbeat detection interval, it disconnects the link between the AC and the AP and reports an error message to the AP.
Precautions
If dual-link backup is enabled, the CAPWAP heartbeat detection interval is 25s and the number of CAPWAP heartbeat detections is 3. When the Wireless Distribution System (WDS) is required in dual-link backup configuration, the WDS link may be unstable and users may not access the network. You need to run this command to set the interval for CAPWAP heartbeat detection to 25 seconds and the number of CAPWAP heartbeat detections to 6.
After the CAPWAP heartbeat detection interval and the number of CAPWAP heartbeat detections are configured, the interval and the number of times for sending Echo packets are configured.
Radio traffic statistics packets are sent and received together with Echo packets.
If you set the CAPWAP heartbeat detection interval and the number of CAPWAP heartbeat detections smaller than the default values, the CAPWAP link reliability is degraded. Exercise caution when you set the values. The default values are recommended.