HP procurve 5300xl Series Access Security Manual page 193

aaa port-access authenticator < port-list > (Syntax Continued)
[initialize]
On the specified ports, blocks inbound and outbound
traffic and restarts the 802.1x authentication process.
This happens only on ports configured with control auto
and actively operating as 802.1x authenticators. Note:
If a specified port is configured with control authorized
and port-security, and the port has learned an autho­
rized address, the port will remove this address and
learn a new one from the first packet it receives.
[reauthenticate]
Forces reauthentication (unless the authenticator is in
'HELD' state).
[clear-statistics]
Clears authenticator statistics counters.
Configuring Port-Based Access Control (802.1x)
Configuring Switch Ports as 802.1x Authenticators
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