Cisco Catalyst 4500 Series Administration Guide

29-11
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
OL_28731-01
Chapter 29 Configuring 802.1Q Tunneling, VLAN Mapping, and Layer 2 Protocol Tunneling
Configuring VLAN Mapping
Configuring VLAN Mapping
The following procedures show how to configure each type of VLAN mapping on trunk ports. To verify
your configuration, enter either the show interfaces interface-id vlan mapping or the
show vlan mapping privileged EXEC command. See the “Monitoring and Maintaining Tunneling
Status” section on page 29-18 for the syntax of these commands. For more information about all
commands in this section, see the Catalyst 4500 Series Switch Software Command Reference for this
release.
The following VLAN mapping types are discussed:
• One-to-One Mapping, page 29-11
• Traditional Q-in-Q on a Trunk Port, page 29-12
• Selective Q-in-Q on a Trunk Port, page 29-12
One-to-One Mapping
To configure one-to-one VLAN mapping to map a customer VLAN ID to a service-provider VLAN ID,
perform this task:
Use the no switchport vlan mapping vlan-id translated-id command to remove the VLAN mapping
information. Entering the no switchport vlan mapping all command deletes all mapping
configurations.
This example shows how to map VLAN IDs 1 to 5 in the customer network to VLANs 101 to 105 in the
service-provider network (Figure 29-5). You configure the same VLAN mapping commands for a port
in Switch A and Switch B; the traffic on all other VLAN IDs is dropped.
Switch(config)# interface gigabiethernet0/1
Switch(config-if)# switchport vlan mapping 1 101
Switch(config-if)# switchport vlan mapping 2 102
Switch(config-if)# switchport vlan mapping 3 103
Command Purpose
Step 1
Switch# configure terminal
Enters global configuration mode.
Step 2
Switch(config)# interface
interface-id
Enters interface configuration mode for the interface connected to the
service-provider network. You can enter a physical interface or an
EtherChannel port channel.
Step 3
Switch(config-if)# switchport mode
trunk
Configures the interface as a trunk port.
Step 4
Switch(config-if)# switchport vlan
mapping vlan-id translated-id
Enters the VLAN IDs to be mapped:
• vlan-id—the customer VLAN ID (C-VLAN) entering the switch
from the customer network. The range is from 1 to 4094.
• translated-id—the assigned service-provider VLAN ID (S-VLAN).
The range is from 1 to 4094.
Note Packets with unconfigured vlan_ids are dropped.
Step 5
Switch# end
Returns to privileged EXEC mode.
Step 6
Switch# show vlan mapping
Verifies the configuration.
Step 7
Switch# copy running-config
startup-config
(Optional) Saves your entries in the configuration file.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E