VPC-139 Cisco IOS XR Virtual Private Network Configuration Guide for the Cisco CRS Router OL-24669-01 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 Contents • Prerequisites for Layer 2 Tunnel Protocol Version 3, page VPC-139 • Information About Layer 2 Tunnel Protocol Version 3, page VPC-140 • How to Implement Layer 2 Tunnel Protocol Version 3, page VPC-147 • Configuration Examples for Layer 2 Tunnel Protocol Version 3, page VPC-166 • Additional References, page VPC-167 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 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. • You must enable Cisco Express Forwarding (CEF) before you configure a cross-connect attachment circuit (AC) for a customer edge (CE) device. • You must configure a Loopback interface on the router for originating and terminating the L2TPv3 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. Release Modification Release 3.9.0 This feature was introduced.
Implementing Layer 2 Tunnel Protocol Version 3 Information About Layer 2 Tunnel Protocol Version 3 VPC-140 Cisco IOS XR Virtual Private Network Configuration Guide for the Cisco CRS Router OL-24669-01 • You must enable Simple Network Management Protocol (SNMP) notifications of L2TP session up and session down events. Note A cross-connection is expressed as xconnect in the CLI. Information About Layer 2 Tunnel Protocol Version 3 To configure the L2TPv3 feature, you should understand the following concepts: • L2TPv3 Operation, page VPC-140 • L2TPv3 Benefits, page VPC-141 • L2TPv3 Features, page VPC-141 L2TPv3 Operation Figure 22 shows how the L2TPv3 feature is used to set up VPNs using Layer 2 tunneling over an IP network. All traffic between two customer network sites is encapsulated in IP packets carrying L2TP data messages and sent across an IP network. The backbone routers of the IP network treat the traffic as any other IP traffic and needn’t know anything about the customer networks.
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