Cisco 2950 - Catalyst Switch Especificaciones descargar pdf (Pagina 511)

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Catalyst 2950 and Catalyst 2955 Switch Command Reference

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Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands

switchport block

Use the switchport block interface configuration command to prevent forwarding of unknown multicast

or unicast packets. Use the no form of this command to allow forwarding of unknown multicast or

unicast packets.

switchport block {multicast | unicast}

no switchport block {multicast | unicast}

This command is available only on these switches:

• Catalyst 2950 Long-Reach Ethernet (LRE) switches running Cisco IOS Release 12.1(14)EA1

or later

• Catalyst 2950G-12-EI, 2950G-24-EI, 2950G-24-EI-DC, 2950G-48-EI, and 2955 switches running

Cisco IOS Release 12.1(19)EA1 or later

Syntax Description

Defaults Unknown multicast and unicast traffic are not blocked.

Command Modes Interface configuration

Command History

Usage Guidelines By default, all traffic with unknown MAC addresses is sent to all ports. You can block unknown multicast

or unicast traffic on protected or non-protected ports. If unknown multicast or unicast traffic is not

blocked on a protected port, there could be security issues.

Blocking unknown multicast or unicast traffic is not automatically enabled on protected ports; you must

explicitly configure it.

Note For more information about blocking packets, see the software configuration guide for this release.

Examples This example shows how to block unknown multicast traffic on an interface:

Switch(config-if)# switchport block multicast

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

command.

multicast Specify that unknown multicast traffic should be blocked.

unicast Specify that unknown unicast traffic should be blocked.

Release Modification

12.1(14)EA1 This command was introduced.

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