Virtual Private LAN Service (VPLS) Using Label Distribution Protocol (LDP) Signaling
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From: The IESG <firstname.lastname@example.org> To: IETF-Announce <email@example.com> Cc: Internet Architecture Board <firstname.lastname@example.org>, RFC Editor <email@example.com>, l2vpn mailing list <firstname.lastname@example.org>, l2vpn chair <email@example.com> Subject: Protocol Action: 'Virtual Private LAN Services Using LDP' to Proposed Standard The IESG has approved the following document: - 'Virtual Private LAN Services Using LDP ' <draft-ietf-l2vpn-vpls-ldp-10.txt> as a Proposed Standard This document is the product of the Layer 2 Virtual Private Networks Working Group. The IESG contact persons are Mark Townsley and Jari Arkko. A URL of this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-l2vpn-vpls-ldp-10.txt
Technical Summary The service described in this document, the Virtual Private LAN Service (VPLS), also known as Transparent LAN Service, offers a variant of a Layer 2 Virtual Private Network (L2VPN). In the case of VPLS, a multipoint network connects the VPN customers, in contrast to the more traditional Layer 2 VPNs, which are point-to-point in nature. This document describes the functions required to offer VPLS, mechanisms for signaling a VPLS, and rules for forwarding and learning from VPLS frames across a packet switched network, how to separate traffic in different VPN and to de-multiplex traffic at the PE routers. The VPLS-LDP is agnostic when it comes to discovery of VPLS end-points. Working Group Summary The VPLS solutions have been one of the controversies of the VPN working groups. There have been two sets of solutions and much arguing on the relative merits of these solutions. An agreement was reached that it is not really the choice of signaling protocol that is the major difference between the LDP and BGP based solutions, but the kind of environment they are targeted for. VPLS-LDP targets networks (e.g., metro) where BGP is typically not run or LDP is used for other L2VPNs (e.g., VPWS). On the other hand, VPLS-BGP targets those networks where L3VPNs using BGP are also deployed. The VPLS-BGP has been through a number of reviews, including reviews in the l2vpn working group and the idr group. The same type of review has been done for vpls-ldp from the l2vpn and mpls working groups. Protocol Quality The protocol is implemented and deployed. A fair number of vendors have implemented the spec. The number of deployments is large. We have not had any reviewer standing up and saying that there is any need for major rework. Note to RFC Editor Please add a normative reference to RFC 2119 and cite it in section 1. Please retitle this document as: Virtual Private LAN Service (VPLS) using LDP Signaling IESG Note The L2VPN Working Group produced two separate documents, [RFC-draft-ietf-l2vpn-vpls-ldp] and [RFC-draft-ietf-l2vpn-vpls-bgp], that ultimately perform similar functions in different manners. Be aware that each method is commonly referred to as "VPLS" even though they are distinct and incompatible with one another.