Re: [Teas] "Hierarchical T-SDN Controller"

["Scharf, Michael (Nokia - DE/Stuttgart)" <[e-mail]>]

As a chair in TSV, I can confirm that “transport” is used for L4 “stuff”.

As far as I can tell, the term “transport network” is not used for L4 “stuff”.

Michael



From: Jeff Tantsura [mailto:[e-mail]]
Sent: Wednesday, July 19, 2017 10:58 AM
To: Daniele Ceccarelli <[e-mail]>; Scharf, Michael (Nokia - DE/Stuttgart) <[e-mail]>; TEAS WG <[e-mail]>
Subject: Re: [Teas] "Hierarchical T-SDN Controller"

dealing with this on daily bases, outside of our, rather small world, transport is commonly understood as L4 “stuff”

Cheers,
Jeff

From: Teas <[e-mail]<mailto:[e-mail]>> on behalf of Daniele Ceccarelli <[e-mail]<mailto:[e-mail]>>
Date: Wednesday, July 19, 2017 at 10:49
To: "Scharf, Michael (Nokia - DE/Stuttgart)" <[e-mail]<mailto:[e-mail]>>, TEAS WG <[e-mail]<mailto:[e-mail]>>
Subject: Re: [Teas] "Hierarchical T-SDN Controller"

And on that i totally agree with you.

…and yes, on the netslices mailing list I was reprimanded by the transport ADs for using the term transport for non layer 4 stuff 😊

BR
Daniele

From: Teas [mailto:[e-mail]] On Behalf Of Scharf, Michael (Nokia - DE/Stuttgart)
Sent: mercoledì 19 luglio 2017 10:41
To: Daniele Ceccarelli <[e-mail]<mailto:[e-mail]>>; TEAS WG <[e-mail]<mailto:[e-mail]>>
Subject: Re: [Teas] "Hierarchical T-SDN Controller"

Well, the IETF has an area called “TSV” and so in the IETF “transport” has yet another meaning ;-)

Given that, such terminology would have to be defined in IETF documents anyway. A definition of these terms could clarify the meaning for MPLS-TE and SR-TE.

Anyway, my key point is that I think the terminology used by draft-bryskin-te-topo-and-tunnel-modeling-00 is easy to understand by people outside the IETF.

Michael



From: Daniele Ceccarelli [mailto:[e-mail]]
Sent: Wednesday, July 19, 2017 10:28 AM
To: Scharf, Michael (Nokia - DE/Stuttgart) <[e-mail]<mailto:[e-mail]>>; TEAS WG <[e-mail]<mailto:[e-mail]>>
Subject: RE: "Hierarchical T-SDN Controller"

+1 , BUT…

We need to be careful with the word “transport”. In some contexts it refers to pure transport technologies (e.g. OTN, WDM) and does not include other upper layer TE technologies (e.g. MPLS-TE and SR-TE), in other contexts it includes also the latter.
I’m more than happy to use the term transport SDN controller provided we’re all on the same page (which should be the second).

BR
Daniele



From: Teas [mailto:[e-mail]] On Behalf Of Scharf, Michael (Nokia - DE/Stuttgart)
Sent: mercoledì 19 luglio 2017 10:01
To: TEAS WG <[e-mail]<mailto:[e-mail]>>
Subject: [Teas] "Hierarchical T-SDN Controller"

In the (useful) I-D draft-bryskin-te-topo-and-tunnel-modeling-00, Section 1.9. “Multi-Domain Transport Service Coordination” uses the following wording:

   A client of multiple TE network domains may need to
   orchestrate/coordinate its transport service setup/manipulation
   across some or all the domains. One example of such a client is a
   Hierarchical T-SDN Controller, HC, managing a connected multi-domain
   transport network where each of the domains is controlled by a
   separate Domain T-SDN Controller, DC.

Outside the IETF, I have the impression that this terminology is quite common when discussing TEAS YANG models. I wonder whether we could use this terminology more frequently inside in TEAS.

Michael
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