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Re: [Detnet-dp-dt] question on section 4.1

Balázs Varga A <balazs.a.varga@ericsson.com> Wed, 21 June 2017 06:15 UTC

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From: =?iso-8859-1?Q?Bal=E1zs_Varga_A?= <balazs.a.varga@ericsson.com>
To: Lou Berger <lberger@labn.net>, "Detnet-dp-dt@ietf.org" <Detnet-dp-dt@ietf.org>
Thread-Topic: [Detnet-dp-dt] question on section 4.1
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Date: Wed, 21 Jun 2017 06:15:19 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/detnet-dp-dt/FS7-SRWifeX5Bv-AKmgKgm3Pe58>
Subject: Re: [Detnet-dp-dt] question on section 4.1
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Hi Lou,

This text in the draft is a very short summary of a somewhat longer discussion we have had on the calls. 
It seems to be too short ... It intends to refer to the following:

In case of PWoMPLS there may be many labels in the label stack (SR labels, etc.) of a DetNet packet. 
Transit (P) nodes should ensure zero-congestion-loss by allocating resources for the DetNet flows.
In order to identify a given DetNet flow (and using the for the flow allocated resources) transit 
nodes need to walk through the whole label stack, what may not be supported by the transit node 
or may impact the packet forwarding capabilities of the node. Furthermore it requires per DetNet 
flow states on transit nodes.

These requirements could be simplified by putting together multiple DetNet flows e.g., in a tunnel 
and allocate resources on a transit node only for such an "aggregate DetNet flow". So, the transit 
node has to identify only the tunnel and not each individual DetNet flow, what results in simplified 
operation and less states. 

Cheers
Bala'zs

-----Original Message-----
From: Detnet-dp-dt [mailto:detnet-dp-dt-bounces@ietf.org] On Behalf Of Lou Berger
Sent: 2017. június 20. 19:34
To: Detnet-dp-dt@ietf.org
Subject: [Detnet-dp-dt] question on section 4.1

Does anyone know what the following is intended to mean:


  However, transit nodes may have limited capabilities to recognize DetNet
  specific fields (e.g., in case of MPLS the PW label). Therefore, identifying each
  individual DetNet flow on a transit node may not be achieved in some network
  scenarios.

Thanks,

Lou

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