Authentication Commands 4

port security

This command enables or configures port security. Use the no form without any keywords to disable port security. Use the no form with the appropriate keyword to restore the default settings for a response to security violation or for the maximum number of allowed addresses.

Syntax

port security [action {shutdown trap trap-and-shutdown} max-mac-count address-count]

no port security [action max-mac-count]

•action - Response to take when port security is violated.

-shutdown - Disable port only.

-trap - Issue SNMP trap message only.

-trap-and-shutdown - Issue SNMP trap message and disable port.

•max-mac-count

-address-count- The maximum number of MAC addresses that can be learned on a port. (Range: 0 - 1024, where 0 means disabled)

Default Setting

•Status: Disabled

•Action: None

•Maximum Addresses: 0

Command Mode

Interface Configuration (Ethernet Ports 1-8)

Command Usage

•If you enable port security, the switch stops learning new MAC addresses on the specified port when it has reached a configured maximum number. Only incoming traffic with source addresses already stored in the dynamic or static address table will be accepted.

•First use the port security max-mac-count command to set the number of addresses, and then use the port security command to enable security on the port.

•Use the no port security max-mac-count command to disable port security and reset the maximum number of addresses to the default.

•You can also manually add secure addresses with the mac-address-table static command.

•A secure port has the following restrictions:

-Cannot use port monitoring.

-Cannot be a multi-VLAN port.

-Cannot be connected to a network interconnection device.

-Cannot be a trunk port.

•If a port is disabled due to a security violation, it must be manually re-enabled using the no shutdown command.

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