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Re: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc

"Bernier, Daniel" <daniel.bernier@bell.ca> Wed, 04 April 2018 03:25 UTC

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From: "Bernier, Daniel" <daniel.bernier@bell.ca>
To: Robert Raszuk <robert@raszuk.net>
CC: "mpls@ietf.org" <mpls@ietf.org>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc
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Date: Wed, 04 Apr 2018 03:25:52 +0000
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Subject: Re: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc
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Hi,


Robert, from what I gather, these labels (although it may be perceived as such) are there to represent in label stack format the SPI/SI of NSH providing path awareness at each hop in the network, not used in the forwarding path. The reference to SR seems only to be on wether one should use pop/swap or SR for transport ... not much added value in the draft except to affirm that it could run over an SR-MPLS implementation.


I agree that it is plays strangely close to SR architecture by the use of global labels for unique IDs. I am cautious about it though because it would mean that anyone that comes up with an idea of using globally assigned labels for a specific use case might be forbidden.


What I am really challenging is the necessity for this draft knowing that:

a) we have a working implementation of VPN based chaining with draft-bess-service-chaining where path info resides in BGP control-plane.

b) we have RFC8300 for service overlay where path info resides in the NSH header and is carried along the path.?

c) we have draft-xuclad-sr-service-chaining using segment-routing where path info is known at the edges and potentially computed at a controller.


Cheers,


Dan B

________________________________
From: rraszuk@gmail.com <rraszuk@gmail.com> on behalf of Robert Raszuk <robert@raszuk.net>
Sent: Monday, April 2, 2018 7:35 AM
To: Bernier, Daniel
Cc: mpls@ietf.org; sfc@ietf.org
Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc

Daniel,

I actually don't think that removal of SR references is a good thing here. The draft still uses source based label stacking as well as global (domain wide) meaning of a label. So even without calling it SR it is still based on SR architecture.

Best,
R


On Sun, Apr 1, 2018 at 5:50 AM, Bernier, Daniel <daniel.bernier@bell.ca<mailto:daniel.bernier@bell.ca>> wrote:

+1,

As explained on the list, with the SR reference removed from draft-barrel-mpls-sfc, I have no opposition for it to progress that is IF the WG actually believes it needs to. I did question it's need as an label based implementation of RFC7665 while we already draft-bess-service-chaining to do chain services on existing MPLS platforms.

Cheers,

Daniel Bernier

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