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Configuring the authentication trigger function
About the authentication trigger function
The authentication trigger function enables the network access device to initiate 802.1X authentication
when 802.1X clients cannot initiate authentication.
This function provides the following types of authentication trigger:
• Multicast trigger—Periodically multicasts Identity EAP-Request packets out of a port to detect 802.1X
clients and trigger authentication.
• Unicast trigger—Enables the network device to initiate 802.1X authentication when it receives a
data frame from an unknown source MAC address. The device sends a unicast Identity
EAP/Request packet to the unknown source MAC address, and retransmits the packet if it has
received no response within a period of time. This process continues until the maximum number of
request attempts set with the dot1x retry command (see "Setting the maximum number of
a
uthentication request attempts") is reached.
The identity request timeout timer sets both the identity request interval for the multicast trigger and the
identity request timeout interval for the unicast trigger.
Configuration guidelines
Follow these guidelines when you configure the authentication trigger function:
• Enable the multicast trigger on a port when the clients attached to the port cannot send EAPOL-Start
packets to initiate 802.1X authentication.
• Enable the unicast trigger on a port if only a few 802.1X clients are attached to the port and these
clients cannot initiate authentication.
• To avoid duplicate authentication packets, do not enable both triggers on a port.
Configuration procedure
Follow these steps to configure the authentication trigger function on a port:
To do… Use the command… Remarks
Enter system view system-view —
Set the username request timeout
timer
dot1x timer tx-period
tx-period-value
Optional
The default is 30 seconds.
Enter Layer 2 Ethernet interface
view
interface interface-type
interface-number
—
Enable an authentication trigger
function
dot1x { multicast-trigger |
unicast-trigger }
Required if you want to enable the
unicast trigger.
By default, the multicast trigger is
enabled, and the unicast trigger is
disabled.
Specifying a mandatory authentication domain on a port
You can place all 802.1X users in a mandatory authentication domain for authentication, authorization,
and accounting on a port. No user can use an account in any other domain to access the network
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