Configuration Guide 802.1x Configuration
Figure 0-7
Configuring On-line Probe on Client End
To ensure accurate charging, an on-line probe mechanism is needed to detect whether a user is on-line within a short
period. The re-authentication mechanism specified in the standard can meet such needs, but it needs the participation of
the RADIUS server. Accurate user probe will occupy enormous resources of the switch and RADIUS server. To meet the
need to implement accurate charging with few resources occupied, we use a new client on-line probe mechanism. Such
mechanism only needs interaction between the switch and client and occupies little network traffic, and it implements
minute-level charging accuracy (you can set the charging accuracy).
To implement on-line client monitoring, the client software must support this function.
The following two timers affect the performance and accuracy of on-line probe:
Hello Interval: It is the interval at which the client sends advertisement.
Alive Interval: Client online interval. If the device has not received the client advertisement during this interval, it
actively disconnects the client and notifies the billing server. The interval must be greater than the Hello Interval.
In the privileged EXEC mode, you can configure the on-line probe function of the client by performing the following steps:
Configuring the Option Flag for EAPOL Frames to Carry TAG
In accordance with IEEE 802.1x, the EAPOL packets cannot be added with vlan TAG. However, based on the possible
application requirements, the selection flag is provided. When the flag is turned on, tags can be outputted according to the
related output rule of the trunk ports.
The typical application environment is to enable 802.1x authentication on the convergence layer. For more information,
see “Topologies of Typical Applications”.
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