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Application-Layer Traffic Optimization

Document Charter Application-Layer Traffic Optimization WG (alto)
Title Application-Layer Traffic Optimization
Last updated 2021-09-21
State Approved
WG State Active
IESG Responsible AD Martin Duke
Charter edit AD Martin Duke
Send notices to (None)

The ALTO working group was established in 2008 to devise a request/response
protocol to allow a host to choose optimal paths to resources from a server
with more knowledge of the network. The working group developed an HTTP-based
protocol, and reported proof-of-concepts of ALTO based solutions supporting
applications such as content distribution networks (CDN).

To support current and future deployments of ALTO, the working group is now
chartered for the following activities:

o Develop operational support tools for ALTO. Based on experience from
deployments, the advice in RFC 7971, and the latest opinions and techniques
from the Operations and Management Area, the working group will develop tools
to configure, operate, and manage the ALTO protocol and networks that use ALTO.
This may include YANG models and Operations, Administration, and Maintenance
(OAM) mechanisms, in consultation with the OPS area and the IPPM WG. The
working group may also update RFC 7971 in the light of new experience and
protocol features that were added to ALTO after that RFC was published.

o Support for modern transport protocols. ALTO only uses the capabilities of
HTTP version 1. While ALTO can operate successfully over any version of HTTP,
it would benefit from leveraging HTTP/2 and HTTP/3 capabilities such as push.
The WG will produce an ALTO extension that leverages these capabilities if they
can be shown to improve performance.

o The WG will place special emphasis on the normal group activities of
collecting deployment experience, exploring use cases, and protocol
maintenance. The working group will not develop protocol extensions for new use
cases until it has been re-chartered specifically for that purpose. A report on
wide-scale deployment of ALTO and documented demand for new use cases will be
critical to the decision to recharter or close the Working Group.

At the conclusion of the OAM and HTTP2/3 deliverables, plus completion of any
adopted drafts emerging from urgent protocol maintenance needs, the working
group will close or recharter.

Furthermore, the Area Director and chairs will assess the state of the
deliverables at the end of 2022. If the Area Director judges that delivery of
these documents is not imminent, and that documentation of wide deployment is
missing, the AD may close the working group immediately. The AD may also either
move each adopted document to another working group for completion, or abandon
the work.