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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
• shutdown—a port security violation causes the interface to become error-disabled and to shut down
immediately, and the port LED turns off. An SNMP trap is sent, a syslog message is logged, and the
violation counter increments. When a secure port is in the error-disabled state, you can bring it out
of this state by entering the errdisable recovery cause psecure-violation global configuration
command, or you can manually re-enable it by entering the shutdown and no shut down interface
configuration commands. This is the default mode.
Table 21-1 shows the violation mode and the actions taken when you configure an interface for port
security.
Default Port Security Configuration
Table 21-2 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.
• A secure port cannot be a private-VLAN port.
Table 21-1 Security Violation Mode Actions
Violation Mode
Traffic is
forwarded
1
1. Packets with unknown source addresses are dropped until you remove a sufficient number of secure MAC addresses.
Sends SNMP
trap
Sends syslog
message
Displays error
message
2
2. The switch returns an error message if you manually configure an address that would cause a security violation.
Violation
counter
increments Shuts down port
protect No No No No No No
restrict No Yes Yes No Yes No
shutdown No Yes Yes No Yes Yes
Table 21-2 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.