Creating A Vlan Map - Cisco Catalyst 3120 Software Manual
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Chapter 34
Configuring Network Security with ACLs
•
For configuration examples, see the
For information about using both router ACLs and VLAN maps, see the
Configuration Guidelines" section on page
Creating a VLAN Map
Each VLAN map consists of an ordered series of entries. Beginning in privileged EXEC mode, follow
these steps to create, add to, or delete a VLAN map entry:
Command
Step 1
configure terminal
Step 2
vlan access-map name [number]
Step 3
action {drop | forward}
Step 4
match {ip | mac} address {name |
number} [name | number]
Step 5
end
Step 6
show running-config
Step 7
copy running-config startup-config
Use the no vlan access-map name global configuration command to delete a map. Use the no vlan
access-map name number global configuration command to delete a single sequence entry from within
the map.
Use the no action access-map configuration command to enforce the default action, which is to forward.
VLAN maps do not use the specific permit or deny keywords. To deny a packet by using VLAN maps,
create an ACL that would match the packet, and set the action to drop. A permit in the ACL counts as a
match. A deny in the ACL means no match.
OL-12247-01
When a frame is Layer-2 forwarded within a private VLAN, the same VLAN map is applied at the
ingress side and at the egress side. When a frame is routed from inside a private VLAN to an external
port, the private-VLAN map is applied at the ingress side.
For frames going upstream from a host port to a promiscuous port, the VLAN map configured
–
on the secondary VLAN is applied.
For frames going downstream from a promiscuous port to a host port, the VLAN map
–
configured on the primary VLAN is applied.
To filter out specific IP traffic for a private VLAN, you should apply the VLAN map to both the
primary and secondary VLANs. For more information about private VLANs, see
"Configuring Private VLANs."
Purpose
Enter global configuration mode.
Create a VLAN map, and give it a name and (optionally) a number. The
number is the sequence number of the entry within the map.
When you create VLAN maps with the same name, numbers are assigned
sequentially in increments of 10. When modifying or deleting maps, you
can enter the number of the map entry that you want to modify or delete.
Entering this command changes to access-map configuration mode.
(Optional) Set the action for the map entry. The default is to forward.
Match the packet (using either the IP or MAC address) against one or more
standard or extended access lists. Note that packets are only matched
against access lists of the correct protocol type. IP packets are matched
against standard or extended IP access lists. Non-IP packets are only
matched against named MAC extended access lists.
Return to global configuration mode.
Display the access list configuration.
(Optional) Save your entries in the configuration file.
"Using VLAN Maps in Your Network" section on page
34-36.
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
Configuring VLAN Maps
Chapter 15,
34-34.
"VLAN Maps and Router ACL
34-31
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