Abstract
Many Internet applications are used to access resources such as
pieces of information or server processes that are available in several
equivalent replicas on different hosts. This includes, but is not limited
to, peer-to-peer file sharing applications. The goal of Application-Layer
Traffic Optimization (ALTO) is to provide guidance to applications that
have to select one or several hosts from a set of candidates capable of
providing a desired resource. This memo discusses deployment-related
issues of ALTO. It addresses different use cases of ALTO such as
peer-to-peer file sharing and Content Delivery Networks (CDNs) and
presents corresponding examples. The document also includes
recommendations for network administrators and application designers
planning to deploy ALTO, such as recommendations on how to generate ALTO
map information.
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