Re: [alto] ALTO pipeline discussions

"Bertz, Lyle T [CTO]" <Lyle.T.Bertz@sprint.com> Wed, 27 June 2018 11:52 UTC

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From: "Bertz, Lyle T [CTO]" <Lyle.T.Bertz@sprint.com>
To: Qiao Xiang <xiangq27@gmail.com>, IETF ALTO <alto@ietf.org>
CC: "Randriamasy, Sabine (Nokia - FR/Nozay)" <sabine.randriamasy@nokia-bell-labs.com>, Danny Alex Lachos Perez <dlachosper@gmail.com>, Chan Dawn <dawn_chen_f@hotmail.com>, Jensen Zhang <jensen@jensen-zhang.site>, Xiao Lin <x.shawn.lin@gmail.com>, "Christian Esteve Rothenberg" <chesteve@dca.fee.unicamp.br>, "Y. Richard Yang" <yry@cs.yale.edu>
Thread-Topic: ALTO pipeline discussions
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Date: Wed, 27 Jun 2018 11:51:47 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/alto/LoSwJ1DbCE7ZMocRdObxZ3Be_bU>
Subject: Re: [alto] ALTO pipeline discussions
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All,

I am unsure if where to place this in the list but the ability to introduce new metrics into the system is a must.   I know it sounds easy enough in ALTO but consider what should be done when an ALTO server does not currently support a metric, i.e. heterogeneous metrics between servers.    Would a mechanism be possible to

a.       Acquire the ability to provide a new metric

b.      Announce (as opposed to wait for a Client to connect) the new capability

Complementing this with on demand measurements should provide a fairly complete solution.

We have found that in orchestration many networks and vendors are adding new metrics (VNF descriptors) prior to code supporting or code being upgrade to support these metrics.  It would be ideal to get ahead of this situation and offer a solution that can measure prior to needing the measurements for orchestration.

From: Qiao Xiang [mailto:xiangq27@gmail.com]
Sent: Wednesday, June 27, 2018 1:21 AM
To: IETF ALTO <alto@ietf.org>
Cc: Randriamasy, Sabine (Nokia - FR/Nozay) <sabine.randriamasy@nokia-bell-labs.com>om>; Bertz, Lyle T [CTO] <Lyle.T.Bertz@sprint.com>om>; Danny Alex Lachos Perez <dlachosper@gmail.com>om>; Chan Dawn <dawn_chen_f@hotmail.com>om>; Jensen Zhang <jensen@jensen-zhang.site>te>; Xiao Lin <x.shawn.lin@gmail.com>om>; Christian Esteve Rothenberg <chesteve@dca.fee.unicamp.br>br>; Y. Richard Yang <yry@cs.yale.edu>
Subject: Re: ALTO pipeline discussions

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Dear WG members,

As posted in Richard's earlier email, we want to discuss items that are not working group documents but are of interests to the WG. This email is to share my preliminary thoughts on two items: (1) How should ALTO information be integrated/utilize in orchestration; and (2) Use mathematical programming representation abstraction as unified resource representation.

The motivation for me to look into these items are (1) How to represent resource sharing of flows with on-demand routing? and (2) How to represent shared risk link group (SRLG) information of flows? Both these motivating questions are raised during our earlier discussion with people from LNBL and ESNet, one of the major use cases of ALTO. They are highly interested in the linear inequality abstraction introduced in the ALTO path vector draft.

My first design proposal is to use "generalized disjunctive programming" (GDP) as the abstraction. GDP is an optimization modeling technique that can encode not only linear/integer constraints, but logical propositions. I believe it is a good candidate for unified resource representation in ALTO because it is highly expressive and easy to interpret. I prepare a few simple slides to illustrate the basic idea of my design, and will write down the specs in a draft before the cut-off date. Meanwhile, it will be greatly appreciated if you could share your comments or thoughts on this design,

Thank you very much.


Best
Qiao

On Thu, Jun 21, 2018 at 9:58 PM Y. Richard Yang <yry@cs.yale.edu<mailto:yry@cs.yale.edu>> wrote:
Dear all,

It is 24 days to the scheduled ALTO session, on July 16. After this weekend, it will be only 3 weeks. During the last couple of months, to better prepare for the coming IETF, some of us (Danny, Dawn, Lyle, Jensen, Sabine, Shawn, Qiao, Christian) looked at both the current state and the pipeline of ALTO.

For the current-state part, Dawn/Danny/Shawn are doing a wonderful review of ALTO, on ALTO implementations, ALTO in related work. They will continue to lead the efforts.

The objective of this email is to start a thread to discuss the pipeline aspect. We want to discuss items that are not working group documents but have interests. We may or may not have a chance to work on these items, but will definitely help to get the discussion started.

At a high, rough level, we can classify ALTO pipeline into three categories, and in each category, we can identify several potential working items. At the end of this email is a list. We are hoping that we can have a good discussion on this before and during the coming IETF.

Cheers,
Richard, on behalf of Danny, Dawn, Lyle, Jensen, Sabine, Shawn, Qiao, Christian



- App use cases/requirements/architecture

1.    A systematic study of how ALTO info be integrated/utilize in orchestration

a.    One aspect ALTO + PCE, ABNO, Path-based,

2.    Extension to new architectures (e.g., cellular, 5G) endpoint types

3.    Extension to new settings such as multi-domain (ALTO is traditional design for App-Net, i.e., north-south interface, interdomain is more EW interface), SFC, NFV,  edge clouds

- API/base protocol

1.    A general multipart service, SSE -> HTTP/2

2.    Flow cost service, extensible query schema for a set of flows, may including unicast and multicast, multipath, ...

3.    Calendar for endpoint entity properties [Sabine]

4.    Unified resource representation (e.g., mathematical programming representation abstraction, linear inq)

- Backend/infrastructure

1.    Smart/on-demand measurements (query miss trigger, start and collect measurements, formalize the protocol, connect to IPPM, accuracy/freshness, what kind of info to be provided)

2.    Proxy architecture, for scale, interdomain, for fault tolerance, for security/privacy

--
Qiao Xiang
Postdoctoral Fellow,
Department of Computer Science,
Yale University

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