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Configuring LAN Interfaces

Configuring a LAN Extender Interface

IC-53

Cisco IOS Interface Configuration Guide

Once you have defined an access list to filter by a particular vendor code, you can assign this list to a

particular LAN Extender interface so that the interface will then filter based on the MAC source

addresses of packets received on that LAN Extender interface. To apply the access list to an interface,

use the following command in interface configuration mode:

For an example of creating an access list and applying it to a LAN Extender interface, see the “LAN

Extender Interface Access List Examples” section.

Filtering by Protocol Type

You can filter by creating a type-code access list and applying it to a LAN Extender interface.

The LAN Extender interface can filter only on bytes 13 and 14 of the Ethernet frame. In Ethernet packets,

these two bytes are the type field. For a list of Ethernet type codes, refer to the “Ethernet Type Codes”

appendix in the Cisco IOS Bridging and IBM Networking Command Reference, Volume I. In 802.3

packets, these two bytes are the length field.

You can filter by protocol type by creating a protocol-type access list and then applying the access list

to an interface.

Note Type-code access lists can have an impact on system performance; therefore, keep the lists

as short as possible and use wildcard bit masks whenever possible.

To create a protocol-type access list, use the following command in global configuration mode:

To apply an access list to an interface, use the following command in interface configuration mode:

For an example of creating an access list and applying it to a LAN Extender interface, see the “LAN

Extender Interface Access List Examples” section.

Controlling Priority Queueing

Priority output queueing is an optimization mechanism that allows you to set priorities on the type of

traffic passing through the network. Packets are classified according to various criteria, including

protocol and subprotocol type. Packets are then queued on one of four output queues.

Command Purpose

lex input-address-list

access-list-number

Assigns an access list to an interface for filtering by MAC source addresses.

Command Purpose

access-list access-list-number

{permit | deny} type-code wild-mask

Creates an access list to filter frames by protocol type.

Command Purpose

lex input-type-list access-list-number

Adds a filter for Ethernet- and SNAP-encapsulated packets on input.

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Cisco Systems IC-23 Bedienungsanleitung Seite 31