Cisco Catalyst 3550 User Manual

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Catalyst 3550 Multilayer Switch Command Reference
OL-8566-01
Chapter 2 Catalyst 3550 Switch 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 on an interface:
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# switchport protected
You can verify your settings by entering the show interfaces interface-id switchport privileged EXEC
command.
Related Commands
Release Modification
12.1(4)EA1 This command was introduced.
Command Description
show interfaces
switchport
Displays the administrative and operational status of a switching (nonrouting)
port, including port blocking and port protection settings.
switchport block Prevents unknown multicast or unicast traffic on the interface.

Cisco Catalyst 3550 Specifications

General

Category	Switch
QoS	Yes
Form Factor	Rack-mountable
Manageable	Yes
RAM	64 MB
Model	Catalyst 3550
Uplink Ports	2 x GBIC (Gigabit Interface Converter) or SFP (Small Form-factor Pluggable)
Layer Support	Layer 3
VLAN Support	Yes
MAC Address Table Size	12000 entries
Routing Protocol	EIGRP
Features	QoS
Operating Temperature	32 to 113°F (0 to 45°C)
Operating Humidity	10 - 95% (non-condensing)
Ports	24 or 48 10/100 ports