Subject: [Detnet] IP Data Plane draft: 5.1.1.4 rewrite

From: "Black, David" <[email-masked]>
Date: Wed, 24 Jul 2019 18:23:17 +0000

While I was at it, here's the proposed rewrite of 5.1.1.4 to remove use of ECN for flow identification (traffic classification) and remove the DSCP bitmask.  This complements the Section 6 change that I just sent.

OLD

5.1.1.4<https://tools.ietf.org/html/draft-ietf-detnet-ip-01#section-5.1.1.4>.  IPv4 Type of Service and IPv6 Traffic Class Fields

   These fields are used to support Differentiated Services [RFC2474<https://tools.ietf.org/html/rfc2474>]

   and Explicit Congestion Notification [RFC3168<https://tools.ietf.org/html/rfc3168>].  Implementations of

   this document MUST support DetNet flow identification based on the

   IPv4 Type of Service field when processing IPv4 packets, and the IPv6

   Traffic Class Field when processing IPv6 packets.  Implementations

   MUST support bitmask based matching, where bits set to one (1) in the

   bitmask indicate which subset of the bits in the field are to be used

   in determining a match.  Note that all bits set to zero (0) value as

   a bitmask effectively means that these fields are ignored.

NEW

5.1.1.4<https://tools.ietf.org/html/draft-ietf-detnet-ip-01#section-5.1.1.4>.  IPv4 and IPv6 DSCP Fields

   These six-bit fields are used to support Differentiated Services

   [RFC2474<https://tools.ietf.org/html/rfc2474>].  The remaining two bits in the same octet support Explicit

   Congestion Notification (ECN) [RFC3168<https://tools.ietf.org/html/rfc3168>].  Implementations of

   this document MUST support DetNet flow identification based on the

   IPv4 DSCP when processing IPv4 packets, and the IPv6 DSCP

   Traffic Class Field when processing IPv6 packets.  Implementations

   MUST NOT use the ECN field for flow identification.

Thanks, --David
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David L. Black, Senior Distinguished Engineer
Dell EMC, 176 South St., Hopkinton, MA  01748
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