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RFC 8469
Title: Recommendation to Use the Ethernet Control Word
Author: S. Bryant,
A. Malis,
I. Bagdonas
Status: Standards Track
Stream: IETF
Date: November 2018
Mailbox: stewart.bryant@gmail.com,
agmalis@gmail.com,
ibagdona.ietf@gmail.com
Pages: 9
Characters: 19138
Updates: RFC 4448
I-D Tag: draft-ietf-pals-ethernet-cw-07.txt
URL: https://www.rfc-editor.org/info/rfc8469
DOI: 10.17487/RFC8469
The pseudowire (PW) encapsulation of Ethernet, as defined in
RFC 4448, specifies that the use of the control word (CW) is
optional. In the absence of the CW, an Ethernet PW packet can be
misidentified as an IP packet by a label switching router (LSR).
This may lead to the selection of the wrong equal-cost multipath
(ECMP) path for the packet, leading in turn to the misordering of
packets. This problem has become more serious due to the deployment
of equipment with Ethernet Media Access Control (MAC) addresses that
start with 0x4 or 0x6. The use of the Ethernet PW CW addresses this
problem. This document RECOMMENDS the use of the Ethernet PW CW in
all but exceptional circumstances.
This document updates RFC 4448.
This document is a product of the Pseudowire And LDP-enabled Services Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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