CHAPTER
17-1
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
17
Configuring IEEE 802.1Q Tunneling
This chapter describes how to configure IEEE 802.1Q tunneling on the Cisco 7600 series routers.
Note • For complete syntax and usage information for the commands used in this chapter, refer to the Cisco
IOS Master Command List, Release 12.2SX at this URL:
http://www.cisco.com/en/US/docs/ios/mcl/122sxmcl/12_2sx_mcl_book.html
• The WS-X6548-GE-TX, WS-X6548V-GE-TX, WS-X6148-GE-TX, and WS-X6148V-GE-TX
switching modules do not support IEEE 802.1Q tunneling.
This chapter consists of these sections:
• Understanding How 802.1Q Tunneling Works, page 17-1
• 802.1Q Tunneling Configuration Guidelines and Restrictions, page 17-3
• Configuring 802.1Q Tunneling, page 17-6
Tip For additional information (including configuration examples and troubleshooting information), see the
documents listed on this page:
http://www.cisco.com/en/US/products/hw/routers/ps368/tsd_products_support_series_home.html
Understanding How 802.1Q Tunneling Works
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.
A port configured to support 802.1Q tunneling is called a tunnel port. When you configure tunneling,
you assign a tunnel port to a VLAN that you dedicate to tunneling, which then becomes a tunnel VLAN.
To keep customer traffic segregated, each customer requires a separate tunnel VLAN, but that one tunnel
VLAN supports all of the customer’s VLANs.
802.1Q tunneling is not restricted to point-to-point tunnel configurations. Any tunnel port in a tunnel
VLAN is a tunnel entry and exit point. An 802.1Q tunnel can have as many tunnel ports as are needed
to connect customer routers.
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