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Re: [Detnet-dp-dt] a quick look at the replication/discarding case for detnet flows

Balázs Varga A <balazs.a.varga@ericsson.com> Tue, 17 January 2017 15:27 UTC

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From: =?utf-8?B?QmFsw6F6cyBWYXJnYSBB?= <balazs.a.varga@ericsson.com>
To: Loa Andersson <loa@pi.nu>, "detnet-dp-dt@ietf.org" <detnet-dp-dt@ietf.org>
Thread-Topic: [Detnet-dp-dt] a quick look at the replication/discarding case for detnet flows
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Subject: Re: [Detnet-dp-dt] a quick look at the replication/discarding case for detnet flows
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Hi Loa,

Two comments/discussions points for the weekly call:

1, P nodes (recognizing detnet-flows)
P nodes have to recognize detnet-flows in order to use the allocated resources (e.g., QoS) during the 
forwarding of packets belonging to a given detnet-flow. We have two options: 
(i) P nodes recognize "d-pw" label to identify the detnet-flow. This would mean that P nodes have to 
walk through the whole label stack. And I think also that "d-pw" label value must be globally unique 
in the network to make life simple! That can be a scalability issue ...
(ii) We are using different LSP per detnet-flow. This would make identification more simple for P nodes
but raises scalability issues for the LSPs.

2, Distinguishing replica flows (required for OAM purposes)
Let's assume that "node1 and node5" and "node2 and node6" are collapsed. I have created slide13 
based on your slide7 (collapsed nodes denoted as node15 and node26). As a result the upper and 
lower MS-PWs shares the first and second hop link when leaving nodeA. Node15 cannot distinguish
the two replica flows only using the "d-pw" label. We should consider to use different "d-pw" label 
value per "detnet-flow segment". Such a scenario is shown on slide14. Using different "d-pw" labels
may furthermore obsolete the PW-labels ...

Cheers
Bala'zs

-----Original Message-----
From: Detnet-dp-dt [mailto:detnet-dp-dt-bounces@ietf.org] On Behalf Of Loa Andersson
Sent: Saturday, January 14, 2017 5:29 AM
To: detnet-dp-dt@ietf.org
Subject: [Detnet-dp-dt] a quick look at the replication/discarding case for detnet flows

Folks,

I took a quick look at the replication / discarding case we talked about at the meeting this week.

Please remember that so far this is not a proposal, just a demonstration that there is at least one way of doing it.

What is there can bee revised, improved, changed or discarded if we find something better. Take a look a send comments.

/loa

Warning: I have a grave case of dyslexia, so any odd or inventive spelling is pure accident.
-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64

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