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[Detnet] IP Data plane: 5-tuple vs. 6-tuple - proposed text

"Black, David" <David.Black@dell.com> Wed, 24 July 2019 20:30 UTC

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From: "Black, David" <David.Black@dell.com>
To: "detnet@ietf.org" <detnet@ietf.org>
CC: "Black, David" <David.Black@dell.com>
Thread-Topic: IP Data plane: 5-tuple vs. 6-tuple - proposed text
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Date: Wed, 24 Jul 2019 20:30:06 +0000
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Subject: [Detnet] IP Data plane: 5-tuple vs. 6-tuple - proposed text
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I think I found a way out of the rathole that I caused on this topic in the meeting ...



Here's the second paragraph in Section 3 of the IP Data Plane draft (https://tools.ietf.org/html/draft-ietf-detnet-ip-01#section-3):



   The DetNet IP data plane uses "6-tuple" based flow identification,

   where 6-tuple refers to information carried in IP and higher layer

   protocol headers.  The 6-tuple referred to in this document is the

   same as that defined in [RFC3290<https://tools.ietf.org/html/rfc3290>].  Specifically 6-tuple is

   (destination address, source address, IP protocol, source port,

   destination port, and differentiated services (DiffServ) code point

   (DSCP).  General background on the use of IP headers, and 5-tuples,

   to identify flows and support Quality of Service (QoS) can be found

   in [RFC3670<https://tools.ietf.org/html/rfc3670>].  [RFC7657<https://tools.ietf.org/html/rfc7657>] also provides useful background on the

   delivery of DiffServ and "tuple" based flow identification.

   Referring to a 6-tuple allows DetNet nodes to forward packets with

   the 6-tuple as is or remap the DSCP where required by the DetNet

   service.

The following small change suffices to address the roles of 5-tuples vs. 6-tuples:

OLD

   Referring to a 6-tuple allows DetNet nodes to forward packets with

   the 6-tuple as is or remap the DSCP where required by the DetNet

   service.
NEW

   While 5-tuples suffice to identify DetNet flows, using 6-tuples

   enables DetNet nodes to forward packets with an unchanged 6-tuple

   or with a changed DSCP where required by the DetNet service.

Thanks, --David
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