Cisco 6500 Series Software Configuration Manual page 182

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Table of Contents

Understanding How 802.1Q Tunneling Works

The customer switches are trunk connected, but with 802.1Q tunneling, the service provider switches

only use one service provider VLAN to carry all the customer VLANs, instead of directly carrying all

the customer VLANs.

With 802.1Q tunneling, tagged customer traffic comes from an 802.1Q trunk port on a customer device

and enters the service-provider edge switch through a tunnel port. The link between the 802.1Q trunk

port on a customer device and the tunnel port is called an asymmetrical link because one end is

configured as an 802.1Q trunk port and the other end is configured as a tunnel port. You assign the tunnel

port to an access VLAN ID unique to each customer. See

Figure 14-1 IEEE 802.1Q Tunnel Ports in a Service-Provider Network

Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E

VLANs 1 to 100

VLANs 1 to 200

Configuring IEEE 802.1Q Tunneling and Layer 2 Protocol Tunneling

Figure 14-1 on page 14-2

Asymmetric link

Figure 14-2 on

VLANs 1 to 100

VLANs 1 to 200

Troubleshooting