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

["Black, David" <[e-mail]>]

> Are you okay with dropping "While 5-tuples suffice to identify DetNet flows,"
Not by itself - if that text is dropped, I'd want to add a couple of sentences (perhaps not in Section 3) to explain how DetNet flows differ from Diffserv flows, i.e., "microflows" in defined in RFC 2475 (Diffserv Architecture).

If that's ok, I can go write some proposed text ...

Thanks, --David

From: Lou Berger <[e-mail]>
Sent: Thursday, July 25, 2019 11:05 AM
To: Black, David; [e-mail]
Subject: Re: [Detnet] IP Data plane: 5-tuple vs. 6-tuple - proposed text


[EXTERNAL EMAIL]

Hi David,

Thank you for the text. See below.
On 7/24/2019 4:30 PM, Black, David wrote:

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.


Are you okay with dropping "While 5-tuples suffice to identify DetNet flows,"

Thanks,

Lou


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