Agenda for the ALTO 116 WG Session (Hybrid)

https://datatracker.ietf.org/doc/agenda-116-alto/

Session:

Monday, March 3,2023
Session I (09:30-11:30 UTC,04:30-06:30 EST, 01:30-03:30 PDT,17:30-19:30
Beijing Time)

WG Chairs:

Mohamed Boucadair (mohamed.boucadair@orange.com)
Qin Wu (bill.wu@huawei.com)

Available During Session:

ICS: https://datatracker.ietf.org/meeting/116/sessions/alto.ics
MeetEcho: https://meetings.conf.meetecho.com/ietf116/?group=alto
Audio Only: http://mp3.conf.meetecho.com/ietf116/alto/1.m3u
Jabber: xmpp:alto@jabber.ietf.org?join

Available During and After Session:

CodiMD: https://codimd.ietf.org/notes-ietf-116-alto
Slides: https://datatracker.ietf.org/meeting/116/session/alto
Drafts (PDF):
https://datatracker.ietf.org/meeting/116/agenda/alto-drafts.pdf
Drafts (TGZ):
https://datatracker.ietf.org/meeting/116/agenda/alto-drafts.tgz

Deployment Experience Update
Cascading ALTO Deployment
Discussion Leader: Ingmar Poese

ALTO integration with CERN/LHCONE/FTS/RUICO on Multi-domain Setting
https://wiki.ietf.org/en/group/ALTO/deployment
Discussion Leader: Richard Yang, with Jordi Ros Giralt/Mario
Lassnig/Mihai Patrascoiu

ALTO integration for Telefonica CDN
https://wiki.ietf.org/en/group/ALTO/deployment
Discussion Leader: Luis M. Contreras

Non-Chartered items:

ALTO Multi-domain Service
https://www.ietf.org/archive/id/draft-yang-alto-multi-domain-01.txt
https://www.ietf.org/archive/id/draft-lachos-alto-multi-domain-use-cases-02.txt

Discussion Leader:
Jordi Ros Giralt, with Richard Yang/Ingmar Poese/Danny Alex Lachos
Perez/Mario Lassnig

Network and Computing Exposure
https://www.ietf.org/archive/id/draft-contreras-alto-service-edge-07.txt

https://www.ietf.org/archive/id/draft-lcsr-alto-service-functions
https://www.ietf.org/archive/id/draft-yao-alto-core-level-load-balancing-00.txt

Discussion Leader: Luis M. Contreras/Jordi Ros Giralt

Any Other Business

Introduction (Chairs): Session intro & WG Status

Current progress:

• Published 4 RFCs
• Four hackathons, 1 interim meetings (more to come)
• Six ALTO deployments: https://wiki.ietf.org/en/group/ALTO/deployment
• Open source project OpenALTO
• Socializing: OPSAWG, MOPS, TVR... IP Journal article
• Proposed directions

Benocs Cascading ALTO Deployment (Ingmar Poese)

• ALTO deployment by Benocs starts in 2013.
• First production implementation of ALTO in 2015
• Updates since then through 2020+
• Have a customer base
• Deployments: 20+
• Total traffic for ALTO: 60TBit / ~45TBit/s
• Traffic steered by Benocs: 35Tbig
• Steered through ALTO: 2 trails running

ALTO chicken egg problem:

• Networks need enough CDNs to understand ALTO
• CDN need enough network to offer ALTO

So each CDN implements its own interfaces and networks run multiple
interfaces

• Architecture: collect IGP, BGP, augment with SNMP, etc. Convert into
  internal standard format.
• Challenge: Building ALTO map based depends on the correct ingress
  point
• Challenge: Cascading Path Optimization

• ALTO to the rescue: multi-domain case

• Interfaces are used to map hypergiants.

ALTO Deployment CERN (Richard Yang)

• CERN manages one of the largest science networks (LHCOPN, LHCONE) in
  charge of distributing the massive data sets from CERN to 40
  countries globally across 170 data centers
• 457 Petabyes of data in 2022
• Software stack: traditional routing, TCP/IP overlayed with
  data-intense workloads
• Workload scheduler: Rucio / FTS
• On top of basic congestion control model (TCP), providing basic
  fairness. On top, scheduler overlays application level control of
  the workload.
• ALTO/FTS visibility => control
• Plugins for a variety of southbound monitoring tools (e.g., glass)
• Query language
• RFC 9240, RFC 7285

ALTO Telefonica CDN Deployment (Luis Contreras)

• Recap slide from 114, 115
• Pilot Q4 2022 - 1663 subnets retrieved

• Issues:

  • BGP-LS bug, needs OS update
  • Flapping between ALTO server and RR
  • TCPZeroWndow
  • Overflow
  • Under analysis how often we need to retreive the entire topology

• Next steps:

  • Understand how often
  • Information analysis
  • Debuging
  • Producttification of ALTO
  • Automation
  • Wiki
  • Gaps
  • New Pilots (e.g, Brazil)

ALTO Multi-domain Service (Jordi Ros-Giralt)

• Challenges on buiding the paths and associated costs in
  multi-domain.
• Partial information, no global view.
• Leverage ALTO to propagate information for acquiring global
  knowledge.
• Propagation of the information (1) Horizontally (all domains have
  full knowledge) or (2) Vertically (hierarchical approach).
• Incremental deployment: provide guidance
• We have quite a number of I-Ds on this topic
• Next steps to discuss during interim meetings

ALTO for Computing Exposure (Luis Contreras and Jordi Ros-Giralt)

• Collection of I-Ds: alto-ietf-nef, alto-service-edge,
  alto-service-functions
• Heterogeneous data centers
• Identify suitable DC by leveraging ALTO with compute extensions
• Updates in version 06: use cases, and Jordi (Qualcomm) joined
• Use case for split computing
• ALTO (and communicaiton/compute state exposure) is key to support
  new coming service placement and selection problems
• service functions: use ALTO protocol (+ext) to assist on the
  identification of “best” chains
• Not all needs to expose compute are related to traffic steering,
  ALTO can address this gap too