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• To use port security, first allow the switch to dynamically learn the <source
MAC address, VLAN> pair for frames received on a port for an initial training
period, and then enable port security to stop address learning. Be sure you
enable the learning function long enough to ensure that all valid VLAN
members have been registered on the selected port.
• To add new VLAN members at a later time, you can manually add secure
addresses with the mac-address-table static command, or turn off port
security to re-enable the learning function long enough for new VLAN members
to be registered. Learning may then be disabled again, if desired, for security.
• 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.
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 (4-135)
mac-address-table static (4-157)
show mac-address-table (4-158)
802.1x Port Authentication
The switch supports IEEE 802.1x (dot1x) port-based access control that prevents
unauthorized access to the network by requiring users to first submit credentials for
authentication. Client authentication is controlled centrally by a RADIUS server
using EAP (Extensible Authentication Protocol).
Console(config)#interface ethernet 1/5
Console(config-if)#port security action trap
Table 4-31. 802.1X Port Authentication Commands
Command Function Mode Page
authentication dot1x default Sets the default authentication server type GC 4-77
dot1x default Resets all dot1x parameters to their default values GC 4-77
dot1x max-req Sets the maximum number of times that the switch
retransmits an EAP request/identity packet to the client
before it times out the authentication session
GC 4-78
dot1x port-control Sets dot1x mode for a port interface IC 4-78
dot1x operation-mode Allows single or multiple hosts on an dot1x port IC 4-79
dot1x re-authenticate Forces re-authentication on specific ports PE 4-79
dot1x re-authentication Enables re-authentication for all ports GC 4-80