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portal server is reachable; otherwise, it considers that the probe fails and the portal server is
unreachable. This method is effective to only portal servers that support the portal heartbeat
function. Currently, only the iMC portal server supports this function. To implement detection with this
method, you also need to configure the portal server heartbeat function on the iMC portal server
and make sure that the server heartbeat interval configured on the portal server is shorter than or
equal to the probe interval configured on the device.
action { log | permit-all | trap }: Specifies the actions to be taken when the status of a portal server
changes. The following actions are available:
log: Specifies the action as sending a log message. When the status (reachable/unreachable) of a
portal server changes, the access device sends a log message. The log message contains the portal
server name and the current state and original state of the portal server.
permit-all: Specifies the action as disabling portal authentication—enabling portal authentication
bypass. When the device detects that a portal server is unreachable, it disables portal
authentication on the interface referencing the portal server, allowing all portal users on this
interface to access network resources. When the access device receives the portal server heartbeat
packets or authentication packets (such as login requests and logout requests), it re-enables the
portal authentication function.
trap: Specifies the action as sending a trap message. When the status (reachable/unreachable) of a
portal server changes, the access device sends a trap message to the network management server
(NMS). Trap message contains the portal server name and the current state of the portal server.
interval interval: Specifies the interval at which probe attempts are made. The interval argument ranges
from 20 to 600 and defaults to 20, in seconds.
retry retries: Specifies the maximum number of probe attempts. The retries argument ranges from 1 to 5
and defaults to 3. If the number of consecutive, failed probes reaches this value, the access device
considers that the portal server is unreachable.
Description
Use the portal server server-detect command to configure portal server detection, including the detection
method, action, probe interval, and maximum number of probe attempts. With this function configured,
the device checks the status of the specified server periodically and takes the specified actions when the
server status changes.
Use the undo portal server server-detect command to cancel the detection of the specified portal server.
By default, the portal server detection function is not configured.
You can specify one or more detection methods and the actions to be taken.
If both detection methods are specified, a portal server will be regarded as unreachable as long as one
detection method fails, and an unreachable portal server will be regarded as recovered only when both
detection methods succeed.
If multiple actions are specified, the system executes all the specified actions when the status of a portal
server changes.
Deleting a portal server on the device also deletes the detection function for the portal server.
If you configure the detection function for a portal server for multiple times, the last configuration takes
effect. If you do not specify an optional parameter, the default setting of the parameter is used.
The portal server detection function takes effect only when the portal server is referenced on an interface.
Authentication-related packets from a portal server, such as logon requests and logoff requests, have the
same effect as the portal heartbeat packets for the portal server detection function.
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