Prerequisites For Implementing Point To Point Layer 2 Services; L2Vpn Overview - Cisco CRS Configuration Manual

Prerequisites for Implementing Point to Point Layer 2 Services

Release
Release 3.7.0
Release 3.8.0
Release 3.9.0
Release 4.2.0
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Prerequisites for Implementing Point to Point Layer 2 Services
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.
Information About Implementing Point to Point Layer 2 Services
To implement Point to Point Layer 2 Services, you should understand these concepts:

L2VPN Overview

Layer 2 VPN (L2VPN) emulates the behavior of a LAN across an IP or MPLS-enabled IP network allowing
Ethernet devices to communicate with each other as they would when connected to a common LAN segment.
As Internet service providers (ISPs) look to replace their Asynchronous Transfer Mode (ATM) infrastructures
with an IP infrastructure, there is a need for to provide standard methods of using an IP infrastructure to
provide a serviceable L2 interface to customers; specifically, to provide standard ways of using an IP
infrastructure to provide virtual circuits between pairs of customer sites.
Building a L2VPN system requires coordination between the ISP and the customer. The ISP provides L2
connectivity; the customer builds a network using data link resources obtained from the ISP. In an L2VPN
service, the ISP does not require information about a the customer's network topology, policies, routing
information, point-to-point links, or network point-to-point links from other ISPs.
Cisco IOS XR Virtual Private Network Configuration Guide for the Cisco CRS Router, Release 6.1.x
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Prerequisites for Implementing Point to Point Layer 2 Services, page 6
Information About Implementing Point to Point Layer 2 Services, page 6
How to Implement Point to Point Layer 2 Services, page 17
Configuration Examples for Point to Point Layer 2 Services , page 30
Implementing Point to Point Layer 2 services
Modification
Support was added for ATM over MPLS
(ATMoMPLS) with Layer 2VPN capability.
Support was added for QinQ mode and QinAny mode
for EoMPLS.
Support was added for the Generic Routing
Encapsulation (GRE) feature.
Support was added for the Load Balancing with Flow
Aware Transport pseudowires (FAT PW) feature.