Implementing Layer 2 Tunnel Protocol Version 3 - Cisco CRS Configuration Manual

Implementing Layer 2 Tunnel Protocol Version 3

Layer 2 Tunnel Protocol Version 3 (L2TPv3) is an Internet Engineering Task Force (IETF) working group
draft that provides several enhancements to L2TP, including the ability to tunnel any Layer 2 (L2) payload
over L2TP. Specifically, L2TPv3 defines the L2TP protocol for tunneling Layer 2 payloads over an IP core
network using L2 virtual private networks (VPNs).
For additional information about L2TPv3, see MPLS VPNs over IP Tunnels on Cisco IOS XR Software.
Feature History for Implementing Layer 2 Tunnel Protocol Version 3 on Cisco IOS XR
Release
Release 3.9.0
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Prerequisites for Layer 2 Tunnel Protocol Version 3
The following prerequisites are required to implement L2TPv3:
• To perform these configuration tasks, your Cisco IOS XR software system administrator must assign
• You must enable Cisco Express Forwarding (CEF) before you configure a cross-connect attachment
• You must configure a Loopback interface on the router for originating and terminating the L2TPv3
Prerequisites for Layer 2 Tunnel Protocol Version 3, page 145
Information About Layer 2 Tunnel Protocol Version 3, page 146
How to Implement Layer 2 Tunnel Protocol Version 3, page 152
Configuration Examples for Layer 2 Tunnel Protocol Version 3, page 169
you to a user group associated with a task group that includes the corresponding command task IDs. All
command task IDs are listed in individual command references and in the Cisco IOS XR Task ID Reference
Guide.
If you need assistance with your task group assignment, contact your system administrator.
circuit (AC) for a customer edge (CE) device.
traffic. The Loopback interface must have an IP address that is reachable from the remote provider edge
(PE) device at the other end of an L2TPv3 control-channel.
Cisco IOS XR Virtual Private Network Configuration Guide for the Cisco CRS Router, Release 6.1.x
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C H A P T E R
Modification
This feature was introduced.
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