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

Source of RFC: bess (rtg)

Errata ID: 6117
Status: Reported
Type: Technical
Publication Format(s) : TEXT

Reported By: Luc Andre Burdet
Date Reported: 2020-04-22

Section 3.1, 8 says:

3.1.  EVPN Layer 2 Attributes Extended Community
            0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
           |   MBZ                   |C|P|B|  (MBZ = MUST Be Zero)
           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         Name     Meaning
         ---------------------------------------------------------------
         P        If set to 1 in multihoming Single-Active scenarios, ...
         B        If set to 1 in multihoming Single-Active scenarios, ...
         C        If set to 1, a control word [RFC4448] MUST be present ...

8.  IANA Considerations
   Initial registrations are as follows:

        P      Advertising PE is the primary PE.
        B      Advertising PE is the backup PE.
        C      Control word [RFC4448] MUST be present.


It should say:

Option 1 : change explicit bitfield
==========
3.1.  EVPN Layer 2 Attributes Extended Community
            0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
##<swap>   |   MBZ                   |C|B|P|  (MBZ = MUST Be Zero)
           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         Name     Meaning
         ---------------------------------------------------------------
         P        If set to 1 in multihoming Single-Active scenarios, ...
         B        If set to 1 in multihoming Single-Active scenarios, ...
         C        If set to 1, a control word [RFC4448] MUST be present ...

8.  IANA Considerations
   Initial registrations are as follows:

        P      Advertising PE is the primary PE.
        B      Advertising PE is the backup PE.
        C      Control word [RFC4448] MUST be present.


Option 2 : change implicit order
==========
3.1.  EVPN Layer 2 Attributes Extended Community
            0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
           |   MBZ                   |C|P|B|  (MBZ = MUST Be Zero)
           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         Name     Meaning
         ---------------------------------------------------------------
##       B        If set to 1 in multihoming Single-Active scenarios, ...
##<swap 'implicit' list order B,P to match bitfield>
##       P        If set to 1 in multihoming Single-Active scenarios, ...
         C        If set to 1, a control word [RFC4448] MUST be present ...

8.  IANA Considerations
   Initial registrations are as follows:

##      B      Advertising PE is the backup PE.
##<swap 'implicit' list order B,P to match bitfield>
##      P      Advertising PE is the primary PE.
        C      Control word [RFC4448] MUST be present.




Notes:

While technically section 8 is not requesting any bit-position from IANA registry, the ordering of requests P-B-C vs. the field definition B-P-C is confusing, or at least inconsistent.

A clarifying statement is required:
- the field definition is should be swapped; or
- the field definition shall prime over all the places implying order when listing P-B-C

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