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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter       Configuring Identity Features on Layer 3 Interface
Control-Direction (Wake-on-LAN)
5. end
DETAILED STEPS
Command or Action Purpose
Step 1
enable 
Example:
Router> enable
Enables privileged EXEC mode. Enter your 
password if prompted.
Step 2
configure terminal 
Example:
Router# configure terminal
Enters global configuration mode.
Step 3
interface gigabitethernet slot/port
Example:
Router(config)# interface gigabitethernet 
0/0
Enters interface configuration mode.
Step 4
authentication control-direction {in|both}
Example:
Router(config-if)# authentication 
control-direction in
Router(config-if)# authentication 
control-direction both
Configures the port mode as unidirectional or 
bidirectional.
in-The port can send packets to the host, but 
cannot receive packets from the host.
both-The port cannot receive packets from or send 
packets to the host. This is the default value.
Step 5
end
Example:
Router(config-if)# end
Router# 
Returns to privileged EXEC mode.