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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, where 0 means disabled)
Default Setting
• Status: Disabled
• Action: None
• Maximum Addresses: 0
Command Mode
Interface Configuration (Ethernet)
Command Usage
• When port security is enabled with this command, the switch first clears all
dynamically learned entries from the address table. It then starts learning new
MAC addresses on the specified port, and stops learning addresses when it
reaches 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. (The specified maximum address count is effective when port
security is enabled or disabled.)
• 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 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.
25-25
Port Security Commands
25