Specifications

CHAPTER

8-1

Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Software Configuration Guide, Cisco IOS Release 15.1(3)MR

OL-26895-01

Configuring IEEE 802.1Q Tunneling and Layer 2

Protocol Tunneling

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 are required to maintain the VLAN and Layer 2 protocol configurations of each customer without

impacting the traffic of other customers. The Cisco MWR 2941 router supports IEEE 802.1Q tunneling

and Layer 2 protocol tunneling.

Note Release 15.1(1)MR does not support the 802.1ad standard.

Note For complete syntax and usage information for the commands used in this chapter, see the Cisco MWR

2941 Mobile Wireless Edge Router IOS Command Reference, Release 15.0(1)MR.

• Understanding 802.1Q Tunneling, page 8-1

• Configuring 802.1Q Tunneling, page 8-4

• Understanding VLAN Mapping, page 8-7

• Configuring VLAN Mapping, page 8-9

• Understanding Layer 2 Protocol Tunneling, page 8-11

• Configuring Layer 2 Protocol Tunneling, page 8-13

• Monitoring and Maintaining Tunneling and Mapping Status, page 8-16

Understanding 802.1Q Tunneling

Business customers of service providers often have specific requirements for VLAN IDs and the number

of VLANs to be supported. The VLAN ranges required by different customers in the same

service-provider network might overlap, and traffic of customers through the infrastructure might be

mixed. Assigning a unique range of VLAN IDs to each customer would restrict customer configurations

and could easily exceed the VLAN limit (4096) of the 802.1Q specification.

Using the 802.1Q tunneling (QinQ) feature, service providers can use a single VLAN to support

customers who have multiple VLANs. Customer VLAN IDs (C-VLANs) are preserved, and traffic from

different customers is segregated within the service-provider network, even when they appear to be in