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Catalyst 3560 Switch Software Configuration Guide
OL-8553-06
Chapter 24 Configuring Port-Based Traffic Control
Configuring Port Security
Default Port Security Configuration
Tabl e 24-2 shows the default port security configuration for an interface.
Port Security Configuration Guidelines
Follow these guidelines when configuring port security:
• Port security can only be configured on static access ports or trunk ports. A secure port cannot be a
dynamic access port.
• A secure port cannot be a destination port for Switched Port Analyzer (SPAN).
• A secure port cannot belong to a Fast EtherChannel or a Gigabit EtherChannel port group.
Note Voice VLAN is only supported on access ports and not on trunk ports, even though the
configuration is allowed.
• When you enable port security on an interface that is also configured with a voice VLAN, set the
maximum allowed secure addresses on the port to two. When the port is connected to a Cisco IP
phone, the IP phone requires one MAC address. The Cisco IP phone address is learned on the voice
shutdown No Yes Yes No Ye s Yes
shutdown vlan No Ye s Yes No Yes No3
1. Packets with unknown source addresses are dropped until you remove a sufficient number of secure MAC addresses.
2. The switch returns an error message if you manually configure an address that would cause a security violation.
3. Shuts down only the VLAN on which the violation occurred.
Table 24-1 Security Violation Mode Actions (continued)
Violation Mode
Traffic is
forwarded1
Sends SNMP
trap
Sends syslog
message
Displays error
message2
Violation
counter
increments Shuts down port
Tab l e 24-2 Default Port Security Configuration
Feature Default Setting
Port security Disabled on a port.
Sticky address learning Disabled.
Maximum number of secure
MAC addresses per port
1
Violation mode Shutdown. The port shuts down when the maximum number of
secure MAC addresses is exceeded.
Port security aging Disabled. Aging time is 0.
Static aging is disabled.
Type is absolute.