RFC 8214, "Virtual Private Wire Service Support in Ethernet VPN", August 2017

Errata ID: 5571
Status: Rejected
Type: Technical
Publication Format(s) : TEXT
Reported By: gangadhara reddy chavva; SatishKumar N Rodd
Date Reported: 2018-12-10
Rejected by: Martin Vigoureux
Date Rejected: 2019-06-17

Section 3.1 says:

C If set to 1, a control word [RFC4448] MUST be present
when sending EVPN packets to this PE. It is
recommended that the control word be included in the
absence of an entropy label [RFC6790].

It should say:

C If set to 1, a control word [RFC4448] MUST be present
when sending EVPN packets to this PE. It is
recommended that the control word be included in the
absence of an entropy label [RFC6790]. 

For detailed explanation of the behavior of EVPN VPWS 
session based on control word bit can be referred link: 
https://tools.ietf.org/html/rfc4447#section-6.2

which explains all combinations of control word 
configurations in detailed way whic was missing in RFC8214.

Notes:

RFC8214 doesn't mention the cases where control word configuration between the PE's can mismatch, disabled, enabled. which will lead to ambiguity in protocol implementation.
--VERIFIER NOTES--
This could change the specification in a way which in fact would likely require consensus. Authors of this errata are encouraged to follow the normal process and start with having a discussion in BESS WG.

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