Configuring Vlan Maps - Cisco Catalyst 3550 series Software Configuration Manual

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.
For complete syntax and usage information for the commands used in this section, refer to the command
Note
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
Named MAC Extended ACLs" section on page
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
Step 4 Use the vlan filter global configuration command to apply a VLAN map to one or more VLANs.
You cannot apply a VLAN map to a VLAN on a switch that has ACLs applied to Layer 2 interfaces (port
Note
ACLs).
This section contains these topics:
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78-11194-09
"Creating Standard and Extended IP ACLs" section on page 28-8
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.
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
28-26.
Catalyst 3550 Multilayer Switch Software Configuration Guide
Configuring VLAN Maps
and the "Configuring
28-29