Configuring LAN Interfaces

Configuring a LAN Extender Interface

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:

Command

Purpose

 

 

lex input-address-list

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

access-list-number

 

 

 

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:

Command

Purpose

 

 

access-listaccess-list-number

Creates an access list to filter frames by protocol type.

{permit deny} type-code wild-mask

 

 

 

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

Command

Purpose

 

 

lex input-type-list access-list-number

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

 

 

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.

Cisco IOS Interface Configuration Guide

IC-53

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Cisco Systems IC-23 manual Controlling Priority Queueing, IC-53

IC-23 specifications

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