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Chapter 2
Cisco CMTS Configuration Commands
cable l2-vpn-service dot1q
To enable the use of Layer 2 tunnels so that traffic for individual cable modems can be routed over a
particular Virtual Local Area Network (VLAN), use the cable l2-vpn-service dot1q command in global
configuration mode. To disable the use of Layer 2 tunneling, use the no form of this command.
Syntax Description
This command has no arguments or keywords.
Defaults
Layer 2 tunneling is disabled.
Command Modes
Global configuration
Command History
Release
12.2(15)BC2
Usage Guidelines
This command enables the use of Layer 2 tunnels, using IEEE 802.1Q VLAN tagging, on all cable
interfaces in the router. This in turn allows you to map traffic to and from cable modems, on the basis of
the modems' hardware (MAC) addresses, to a particular VLAN on a particular WAN interface, using the
cable dot1q-vc-map
Examples
The following example shows how to enable the use of IEEE 802.1Q Layer 2 tunnels on a router so that
cable modems can be mapped to particular VLAN:
Router# config terminal
Router(config)# cable l2-vpn-service dot1q
Router(config)#
The following example shows how to disable the use of IEEE 802.1Q Layer 2 tunnels on a router. All
mapping of cable modems to IEEE 802.1Q VLANs is halted (but any other Layer 2 mapping, such as
the mapping of cable modems to ATM PVCs, is unaffected).
Router# config terminal
Router(config)# no cable l2-vpn-service dot1q
Router(config)#
OL-1581-08
cable l2-vpn-service dot1q
no cable l2-vpn-service dot1q
Modification
This command was introduced for Cisco uBR7246VXR universal
broadband routers.
command.
Cisco Broadband Cable Command Reference Guide
cable l2-vpn-service dot1q
2-123
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