Provisioning, Auto-Discovery, and Signaling in Layer 2 Virtual Private Networks (L2VPNs)

This RFC 6074 was published in 2011.

Abstract

Provider Provisioned Layer 2 Virtual Private Networks (L2VPNs) may have different "provisioning models", i.e., models for what information needs to be configured in what entities.
Once configured, the provisioning information is distributed by a "discovery process".
When the discovery process is complete, a signaling protocol is automatically invoked to set up the mesh of pseudowires (PWs) that form the (virtual) backbone of the L2VPN.
This document specifies a number of L2VPN provisioning models, and further specifies the semantic structure of the endpoint identifiers required by each model.
It discusses the distribution of these identifiers by the discovery process, especially when discovery is based on the Border Gateway Protocol (BGP).
It then specifies how the endpoint identifiers are carried in the two signaling protocols that are used to set up PWs, the Label Distribution Protocol (LDP), and the Layer 2 Tunneling Protocol version 3 (L2TPv3).

RFC 6074 introduction

[RFC4664] describes a number of different ways in which sets of pseudowires may be combined together into "Provider Provisioned Layer 2 VPNs" (L2 PPVPNs, or L2VPNs), resulting in a number of different kinds of L2VPN.
Different kinds of L2VPN may have different "provisioning models", i.e., different models for what information needs to be configured in what entities.
Once configured, the provisioning information is distributed by a "discovery process", and once the information is discovered, the signaling protocol is automatically invoked to set up the required pseudowires.
The semantics of the endpoint identifiers that the signaling protocol uses for a particular type of L2VPN are determined by the provisioning model.
That is, different kinds of L2VPN, with different provisioning models, require different kinds of endpoint identifiers.
This document specifies a number of L2VPN provisioning models and specifies the semantic structure of the endpoint identifiers required for each provisioning model.

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