## Agenda for the ALTO 116 WG Session (Hybrid)   {#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   {#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)   {#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)   {#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)   {#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)   {#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)   {#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