Switchport Protected - Cisco catalyst 3750 Command Reference Manual
Hide thumbs
Also See for catalyst 3750:
- Software configuration manual (926 pages) ,
- Command reference manual (854 pages) ,
- Hardware installation manual (231 pages)
Table of Contents
Advertisement
Chapter 2 Catalyst 3750 Switch Cisco IOS Commands
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 disable protection on the port.
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
Release
12.1(11)AX
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.
Examples
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
command.
OL-8552-07
switchport protected
no switchport protected
Modification
This command was introduced.
switchport protected
Catalyst 3750 Switch Command Reference
2-857
- Quick Links:
- Cli Command Modes
Hide quick links:
Advertisement
Chapters
Table of Contents
