The Pseudowire (PW) and Virtual Circuit Connectivity Verification (VCCV) Implementation Survey Results (RFC7079)
Original Publication Date: 2013-Nov-01
Included in the Prior Art Database: 2013-Nov-28
Internet Society Requests For Comment (RFCs)
N. Del Regno: AUTHOR [+4]
Most Pseudowire Emulation Edge-to-Edge (PWE3) encapsulations mandate the use of the Control Word (CW) to carry information essential to the emulation, to inhibit Equal-Cost Multipath (ECMP) behavior, and to discriminate Operations, Administration, and Maintenance (OAM) from Pseudowire (PW) packets. However, some encapsulations treat the Control Word as optional. As a result, implementations of the CW, for encapsulations for which it is optional, vary by equipment manufacturer, equipment model, and service provider network. Similarly, Virtual Circuit Connectivity Verification (VCCV) supports three Control Channel (CC) types and multiple Connectivity Verification (CV) types. This flexibility has led to reports of interoperability issues within deployed networks and associated documents to attempt to remedy the situation.
Internet Engineering Task Force (IETF) N. Del Regno, Ed. Request for Comments: 7079 Verizon Communications, Inc. Category: Informational A. Malis, Ed. ISSN: 2070-1721 Consultant November 2013
The Pseudowire (PW) and Virtual Circuit Connectivity Verification (VCCV) Implementation Survey Results
The IETF Pseudowire Emulation Edge-to-Edge (PWE3) working group has defined many encapsulations of various layer 1 and layer 2 service- specific PDUs and circuit data. In most of these encapsulations, use of the Pseudowire (PW) Control Word is required. However, there are several encapsulations for which the Control Word is optional, and this optionality has been seen in practice to possibly introduce interoperability concerns between multiple implementations of those encapsulations. This survey of the Pseudowire / Virtual Circuit Connectivity Verification (VCCV) user community was conducted to determine implementation trends and the possibility of always mandating the Control Word.
Status of This Memo
This document is not an Internet Standards Track specification; it is published for informational purposes.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Not all documents approved by the IESG are a candidate for any level of Internet Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7079.
Del Regno & Malis Informational [Page 1]
RFC 7079 PW/VCCV Implementation Survey Results November 2013
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