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28-29

Catalyst 3550 Multilayer Switch Software Configuration Guide

78-11194-09

Chapter 28 Configuring Network Security with ACLs

Configuring VLAN Maps

This section describes how to configure VLAN maps, which is the only way to control filtering within

a VLAN. VLAN maps have no direction. To filter traffic in a specific direction by using a VLAN map,

you need to include an ACL with specific source or destination addresses. If there is a match clause for

that type of packet (IP or MAC) in the VLAN map, the default action is to drop the packet if the packet

does not match any of the entries within the map. If there is no match clause for that type of packet, the

default is to forward the packet.

Note For complete syntax and usage information for the commands used in this section, refer to the command

reference for this release.

To create a VLAN map and apply it to one or more VLANs, perform these steps:

Step 1 Create the standard or extended IP ACLs or named MAC extended ACLs that you want to apply to the

VLAN. See the “Creating Standard and Extended IP ACLs” section on page 28-8 and the “Configuring

Named MAC Extended ACLs” section on page 28-26.

Step 2 Enter the vlan access-map global configuration command to create a VLAN ACL map entry.

Step 3 In access map configuration mode, optionally enter an action—forward (the default) or drop—and

enter the match command to specify an IP packet or a non-IP packet (with only a known MAC address)

and to match the packet against one or more ACLs (standard or extended).

Note If the VLAN map has a match clause for the type of packet (IP or MAC) and the packet does not

match the type, the default is to drop the packet. If there is no match clause in the VLAN map

for that type of packet, and no action specified, the packet is forwarded.

Step 4 Use the vlan filter global configuration command to apply a VLAN map to one or more VLANs.

Note You cannot apply a VLAN map to a VLAN on a switch that has ACLs applied to Layer 2 interfaces (port

ACLs).

This section contains these topics:

• VLAN Map Configuration Guidelines, page 28-30

• Creating a VLAN Map, page 28-30

• Applying a VLAN Map to a VLAN, page 28-33

• Using VLAN Maps in Your Network, page 28-33

Cisco Catalyst 3550 Series User Manual

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