Switchport Protected - Cisco Catalyst 3120 Command Reference Manual

Catalyst blade switch 3120 for hp command reference

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Cisco Catalyst Blade Switch 3120 for HP Cisco IOS Commands

switchport protected

Use the switchport protected interface configuration command on the switch stack or on a standalone

switch 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 disable protection on the port.

Syntax Description

This command has no arguments or keywords.

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 traffic (unicast, multicast, or broadcast) to any other port that is

also a protected port. Data traffic cannot be forwarded between protected ports at Layer 2; only control

traffic, such as PIM packets, is forwarded because these packets are processed by the CPU and forwarded

in software. All data traffic passing between protected ports must be forwarded through a Layer 3 device.

Because a switch stack represents a single logical switch, Layer 2 traffic is not forwarded between any

protected ports in the switch stack, whether they are on the same or different switches in the stack.

Port monitoring does not work if both the monitor and monitored ports are protected ports.

This example shows how to enable a protected port on an interface:

Switch(config)# interface gigabitethernet1/0/2

Switch(config-if)# switchport protected

You can verify your settings by entering the show interfaces interface-id switchport privileged EXEC

switchport protected

no switchport protected

Modification

This command was introduced.

Cisco Catalyst Blade Switch 3120 for HP Command Reference

switchport protected