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Catalyst 2950 and Catalyst 2955 Switch Command Reference
0L-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
switchport protected
switchport protected
Use the switchport protected interface configuration command to isolate unicast, multicast, and
broadcast traffic at Layer 2 from other protected ports on the same switch. Use the no form of this
command to return to the default setting.
switchport protected
no switchport protected
Syntax Description This command has no arguments or keywords.
Defaults No protected port is defined. All ports are nonprotected.
Command Modes Interface configuration
Command History
Usage Guidelines The switchport protection feature is local to the switch; communication between protected ports on the
same switch is possible only through a Layer 3 device. To prevent communication between protected
ports on different switches, you must configure the protected ports for unique VLANs on each switch
and configure a trunk link between the switches. A protected port is different from a secure port.
A protected port does not forward any unicast, multicast, or broadcast traffic to any other protected port.
A protected port continues to forward unicast, multicast, and broadcast traffic to unprotected ports and
vice versa.
Port monitoring does not work if both the monitor and monitored ports are protected ports.
Protected ports are supported on IEEE 802.1Q trunks.
Examples This example shows how to enable a protected port:
Switch(config)# interface fastethernet0/3
Switch(config-if)# switchport protected
You can verify your settings by entering the show interfaces switchport privileged EXEC command.
Related Commands
Release Modification
12.1(6)EA2 This command was introduced. It replaced the port protected command.
Command Description
show interfaces switchport Displays the administrative and operational staus of a switching port.
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