Cisco Catalyst 2900 Series XL Dokumentacja Pobierz pdf (Strona 184)

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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide

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Chapter 7 Configuring the Switch Ports

Configuring Protected Ports

Some applications require that no traffic be forwarded by the Layer 2 protocol between ports on the same

switch. In such an environment, there is no exchange of unicast, broadcast, or multicast traffic between

ports on the switch, and traffic between ports on the same switch is forwarded through a Layer 3 device

such as a router.

To meet this requirement, you can configure Catalyst 2900 XL and Catalyst 3500 XL ports as protected

ports (also referred to as private VLAN edge ports). Protected ports do not forward any traffic to

protected ports on the same switch. This means that all traffic passing between protected ports—unicast,

broadcast, and multicast—must be forwarded through a Layer 3 device. Protected ports can forward any

type of traffic to unprotected ports, and they forward as usual to all ports on other switches.

Note Sometimes unknown unicast traffic from an unprotected port is flooded to a protected port because

a MAC address has timed out or has not been learned by the switch. Use the port block command to

guarantee that in such a case no unicast and multicast traffic is flooded to the port. See the

“Configuring Flooding Controls” section on page 7-4 for more information.

Beginning in privileged EXEC mode, follow these steps to define a port as a protected port:

Use the no version of the port protected interface configuration command to disable the protected port

option.

Command Purpose

Step 1

configure terminal Enter global configuration mode.

Step 2

interface interface Enter interface configuration mode, and enter the port to be configured.

Step 3

port protected Enable protected port on the port.

Step 4

end Return to privileged EXEC mode.

Step 5

show port protected Verify that the protected port option is enabled.

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Cisco Catalyst 2900 Series XL Dokumentacja Strona 184