Traditional Q-In-Q On A Trunk Port - Cisco Catalyst 4500 Series Software Configuration Manual

Chapter 30 Configuring 802.1Q Tunneling, VLAN Mapping, and Layer 2 Protocol Tunneling
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
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
Switch(config-if)# switchport vlan mapping 4 104
Switch(config-if)# switchport vlan mapping 4 105
Switch(config-if)# exit
In the previous example, at the ingress of the service-provider network, VLAN IDs 1 to 5 in the customer
network are mapped to VLANs 101 to 105, in the service provider network. At the egress of the service
provider network, VLANs 101 to 105 in the service provider network are mapped to VLAN IDs 1 to 5,
in the customer network.
Packets with unconfigured vlan_ids are dropped.
Note

Traditional Q-in-Q on a Trunk Port

To configure VLAN mapping for traditional Q-in-Q on a trunk port or tunneling by default, perform the
following task:
Note Configuring tunneling by default bundles all packets on the port into the configured S-VLAN.
Command
Step 1
Switch# configure terminal
Step 2
Switch(config)# interface
interface-id
Step 3
Switch(config-if)# switchport mode
trunk
Step 4
Switch(config-if)# switchport trunk
allowed vlan vlan-id
Step 5
Switch(config-if)# end
Step 6
Switch# show interfaces
interface-id vlan mapping
Step 7
Switch# copy running-config
startup-config
Entering the no switchport vlan mapping all command deletes all mapping configurations.
(Figure
Purpose
Enters global configuration mode.
Enters interface configuration mode for the interface connected to the
service provider network. You can enter a physical interface or an
EtherChannel port channel.
Configures the interface as a trunk port.
Configures the outer VLAN of the service provider network (S-VLAN) to
to be allowed on the interface. This should be the same outer VLAN ID
entered in the next step.
Returns to privileged EXEC mode.
Verifies the configuration.
(Optional) Saves your entries in the configuration file.
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
30-5). You configure the same VLAN mapping commands for a port
Configuring VLAN Mapping
30-11