General Security Measures

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4
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.
• Use the port security command to enable security on a port. Then use the
port security action command to set the response to a port security violation,
and the port security max-mac-count command to set the maximum
number of addresses allowed on a port.
• 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.
Example
The following example enables port security for port 5, and sets the response to a
security violation to issue a trap message:
Related Commands
shutdown (4-160)
mac-address-table static (4-193)
show mac-address-table (4-194)
Console(config)#interface ethernet 1/5
Console(config-if)#port security action trap