portal local-server keep-alive
Function
The portal local-server keep-alive command configures the heartbeat detection interval and mode of the built-in Portal server.
The undo portal local-server keep-alive command cancels the configured heartbeat detection interval and mode of the built-in Portal server.
By default, the heartbeat detection function of the built-in Portal server is not configured.
Format
portal local-server keep-alive interval interval-value [ auto ]
undo portal local-server keep-alive
Parameters
| Parameter | Description | Value |
|---|---|---|
| interval interval-value | Specifies the heartbeat detection interval of the built-in Portal server. |
The value is an integer that ranges from 30 to 7200, in seconds. |
| auto | Specifies the automatic detection mode. If this parameter is not configured, the forcible detection mode is specified. |
- |
Usage Guidelines
Usage Scenario
- Forcible detection mode: This mode is valid for all users. If the device does not receive a heartbeat packet from a user within a specified period, the device specifies the user to go offline.
- Automatic detection mode: The device checks whether the client
browser supports the heartbeat program. If yes, the forcible detection
mode is used for the user; if no, the device does not detect the user.
You are advised to configure this mode to prevent users from going
offline because the browser does not support the heartbeat program.
Currently, the heartbeat program is supported by Internet Explorer 8, FireFox 3.5.2, Chrome 28.0.1500.72, and Opera 12.00 on Windows 7. A Java program must be installed and configured on the operating system.
Browsers using Java1.7 and later versions do not support the heartbeat program.
Precautions
When the forcible detection mode is configured, the device specifies users to go offline to prevent from failing to receive heartbeat packets for a long time during network congestion. In this scenario, the heartbeat detection interval must be increased.
If you run this command multiple times in the same view, only the latest configuration takes effect.