A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Layer 2 Virtual Private Networks Working Group of the IETF.
Title : Provisioning, Autodiscovery, and Signaling in L2VPNs
Author(s) : E. Rosen, et al.
Filename : draft-ietf-l2vpn-signaling-05.txt
Pages : 35
Date : 2005-8-19
There are a number of different kinds of "Provider Provisioned Layer
2 VPNs" (L2VPNs). The 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".
When the discovery process is complete, a signaling protocol is
automatically invoked. The signaling protocol sets up the mesh of
Pseudowires (PWs) that form the (virtual) backbone of the L2VPN. Any
PW signaling protocol needs to have a method which allows each PW
endpoint to identify the other; thus a PW signaling protocol will
have the notion of an endpoint identifier. The semantics of the
endpoint identifiers which the signaling protocol uses for a
particular type of L2VPN are determined by the provisioning model.
This document specifies a number of L2VPN provisioning models, and
further specifies the semantic structure of the endpoint identifiers
required by each provisioning model. It discusses the way in which
the endpoint identifiers are distributed by the discovery process,
especially when the discovery process is based upon 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 (L2TPv3).
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