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[Detnet-dp-dt] Using MS-PW concept for the d-pw

Balázs Varga A <balazs.a.varga@ericsson.com> Wed, 22 February 2017 16:08 UTC

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From: =?iso-8859-1?Q?Bal=E1zs_Varga_A?= <balazs.a.varga@ericsson.com>
To: "detnet-dp-dt@ietf.org" <detnet-dp-dt@ietf.org>
Thread-Topic: Using MS-PW concept for the d-pw
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Date: Wed, 22 Feb 2017 16:08:22 +0000
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Subject: [Detnet-dp-dt] Using MS-PW concept for the d-pw
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Hi,

d-pw collision can be solved if the MS-PW concept is used for the DetNet-PW.
d-pws between x-PE nodes have their own d-pw label. X-PE nodes do d-pw label swap.
Replicas of a detnet flow have to use different d-pw label.

I have attached a simplified figure:
- detnet-flow1: A -- > D (B is just a segment-stitching point, C does elimination)
- detnet-flow2: F -- > G (E is just a segment-stitching point, B does elimination)

There is no d-pw label collision at B as it allocates the d-pw label for the segments of the
DetNet-PW. So B can ensure that no collision occurs.

You can treat as a drawback that you need a state for each segment, but that is the same as for
"normal" MS-PW scenarios.

As a side effect l-labels are not needed at all. Comments are welcome.

Cheers
Bala'zs

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