Command Line Interface
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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)
Default Setting
• Status: Disabled
• Action: None
• Maximum Addresses: 0
Command Mode
Interface Configuration (Ethernet)
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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