Cisco Catalyst 4500 Series Software Configuration Guide

30-8
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 30 Configuring 802.1Q Tunneling, VLAN Mapping, and Layer 2 Protocol Tunneling
About VLAN Mapping
• Traditional 802.1Q tunneling (QinQ) performs all-to-one bundling of C-VLAN IDs to a single
S-VLAN ID for the port. The S-VLAN is added to the incoming unmodified C-VLAN. You can
configure the UNI as an 802.1Q tunnel port for traditional QinQ, or you can configure selective
QinQ on trunk ports for a more flexible implementation. Mapping takes place at ingress and egress
of the port. All packets on the port are bundled into the specified S-VLAN. See the “Traditional
Q-in-Q on a Trunk Port” section on page 30-11.
• Selective QinQ maps the specified customer VLANs entering the UNI to the specified S-VLAN ID.
The S-VLAN is added to the incoming unmodified C-VLAN. You can also specify whether traffic
carrying all other customer VLAN IDs should be dropped or not. See the “Selective Q-in-Q on a
Trunk Port” section on page 30-12.
Note Untagged packets enter the switch on the trunk native VLAN and are not mapped.
For quality of service (QoS), the switch supports flexible mapping between C-CoS or C-DSCP and
S-CoS, and maps the inner CoS to the outer CoS for traffic with traditional QinQ or selective QinQ
VLAN mapping.
Mapping Customer VLANs to Service-Provider VLANs
Figure 30-5 shows a topology where a customer uses the same VLANs in multiple sites on different sides
of a service-provider network. You map the customer VLAN IDs to service-provider VLAN IDs for
packet travel across the service-provider backbone. The customer VLAN IDs are retrieved at the other
side of the service-provider backbone for use in the other customer site. Configure the same set of VLAN
mappings at a customer-connected port on each side of the service-provider network.
The examples following the configuration steps illustrate how to use one-to-one mapping, traditional
QinQ, or selective QinQ to map customer VLANs 1 to 5 to service-provider VLANs.
Figure 30-5 Mapping Customer VLANs
Service provider
Customer A
VLANs 1-5
Host
Host
Customer A
VLANs 1-5
Customer A
VLANs 1-5
Customer
switches
Customer
switch
Trunk port Trunk port
VLAN mapping at
customer-connecting ports
278036
Switch A Switch B

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