Cisco Catalyst 4500 Series Software Configuration Guide

CHAPTER
30-1
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
30
Configuring 802.1Q Tunneling, VLAN Mapping,
and Layer 2 Protocol Tunneling
Virtual private networks (VPNs) provide enterprise-scale connectivity on a shared infrastructure, often
Ethernet-based, with the same security, prioritization, reliability, and manageability requirements of
private networks. Tunneling is a feature designed for service providers who carry traffic of multiple
customers across their networks and who are required to maintain the VLAN and Layer 2 protocol
configurations of each customer without impacting the traffic of other customers. This chapter describes
how to configure 802.1Q, Layer 2 protocol tunneling, and VLAN mapping (or VLAN ID translation) on
a Catalyst 4500 series switch.
This chapter contains these sections:
• About 802.1Q Tunneling, page 30-1
• Configuring 802.1Q Tunneling, page 30-3
• About VLAN Mapping, page 30-6
• Configuring VLAN Mapping, page 30-9
• About Layer 2 Protocol Tunneling, page 30-13
• Configuring Layer 2 Protocol Tunneling, page 30-15
• Monitoring and Maintaining Tunneling Status, page 30-23
Note For complete syntax and usage information for the switch commands used in this chapter, see the
Cisco IOS Command Reference Guides for the Catalyst 4500 Series Switch.
If a command is not in the Cisco Catalyst 4500 Series Switch Command Reference , you can locate it in
the Cisco IOS Master Command List, All Releases.
About 802.1Q Tunneling
The VLAN ranges required by different customers in the same service provider network might overlap,
and customer traffic through the infrastructure might be mixed. Assigning a unique range of VLAN IDs
to each customer restricts customer configurations and could easily exceed the VLAN limit (4096) of
the 802.1Q specification.
802.1Q tunneling enables service providers to use a single VLAN to support customers who have
multiple VLANs, while preserving customer VLAN IDs and keeping traffic in different customer
VLANs segregated.

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