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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
78-17058-01
Chapter 21 Configuring Port-Based Traffic Control
Configuring Port Security
• When you enter a maximum secure address value for an interface, and the new value is greater than
the previous value, the new value overwrites the previously configured value. If the new value is less
than the previous value and the number of configured secure addresses on the interface exceeds the
new value, the command is rejected.
• The switch does not support port security aging of sticky secure MAC addresses.
Table 21-3 summarizes port security compatibility with other port-based features.
Enabling and Configuring Port Security
Beginning in privileged EXEC mode, follow these steps to restrict input to an interface by limiting and
identifying MAC addresses of the stations allowed to access the port:
Table 21-3 Port Security Compatibility with Other Switch Features
Type of Port or Feature on Port
Compatible with
Port Security
Trunk port Yes
Dynamic-access port (a VLAN Query Protocol [VQP] port configured with the
switchport access vlan dynamic interface configuration command)
No
Routed port No
SPAN source port Yes
SPAN destination port No
EtherChannel No
Tunneling port Yes
Protected port Yes
802.1x port Yes
Private VLAN port No
IP source guard Yes
Dynamic Address Resolution Protocol (ARP) inspection Yes
Flex Links Yes
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the interface to be configured, and enter interface configuration
mode.
Step 3
no shutdown Enable the port, if necessary. By default, UNIs are disabled, and NNIs are
enabled.
Step 4
switchport mode {access | trunk} Set the interface switchport mode as access or trunk; an interface in the
default mode (dynamic auto) cannot be configured as a secure port.
Step 5
switchport port-security Enable port security on the interface.