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Configuring Port-Based and User-Based Access Control (802.1X)
Configuring Switch Ports as 802.1X Authenticators
Prerequisite. As documented in the IEEE 802.1X standard, the disabling of
incoming traffic and transmission of outgoing traffic on an 802.1X-aware
egress port in an unauthenticated state (using the aaa port-access controlled-
directions in command) is supported only if:
■ The port is configured as an edge port in the network using the spanning-
tree edge-port command.
■ The 802.1s Multiple Spanning Tree Protocol (MSTP) or 802.1w Rapid
Spanning Tree Protocol (RSTP) is enabled on the switch. MSTP and RSTP
improve resource utilization while maintaining a loop-free network.
For information on how to configure the prerequisites for using the aaa port-
access controlled-directions in command, see Chapter 4, “Multiple Instance
Spanning-Tree Operation” in the Advanced Traffic Management Guide.
Wake-on-LAN Traffic
The Wake-on-LAN feature is used by network administrators to remotely
power on a sleeping workstation (for example, during early morning hours to
perform routine maintenance operations, such as patch management and
software updates).
The aaa port-access controlled-direction in command allows Wake-on-LAN
traffic to be transmitted on an 802.1X-aware egress port that has not yet
transitioned to the 802.1X authenticated state; the controlled-direction both
setting prevents Wake-on-LAN traffic to be transmitted on an 802.1X-aware
egress port until authentication occurs.
Note Although the controlled-direction in setting allows Wake-on-LAN traffic to
traverse the switch through unauthenticated 802.1X-aware egress ports, it
does not guarantee that the Wake-on-LAN packets will arrive at their destina-
tion. For example, firewall rules on other network devices and VLAN rules
may prevent these packets from traversing the network.
Syntax: aaa port-access <port-list > controlled-directions <both | in>
both (default): Incoming and outgoing traffic is blocked on
an 802.1X-aware port before authentication occurs.
in: Incoming traffic is blocked on an 802.1X-aware port
before authentication occurs. Outgoing traffic with
unknown destination addresses is flooded on
unauthenticated 802.1X-aware ports.
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