Zbigniew Duliński, Piotr Wydrych, and Rafał Stankiewicz refreshed the inter-ALTO communication problem statement draft. The use-cases have been re-written from scratch and generalized. The three new use-cases are:

• Remote view of topology
• Detailed information on remote topology
• Partitioned networks

The draft has been discussed during the ALTO WG meeting at IETF93 in Prague, Czech Republic on July 21, 2015.

Draft's abstract:
The Application-Layer Traffic Optimization (ALTO) protocol has been standardized in RFC7285 to ease better-than-random overlay connection management. Due to various reasons, optimization capabilities of ALTO servers are limited by the fact that it may not be possible for an ALTO server to compute costs for source/destination pairs correctly if a source and/or a destination is outside the administrative domain it belongs to. In other words, an ALTO server may be generally unable to optimize the traffic with only locally available topology information.
Therefore, it is proposed that operators of distinct administrative domains may agree on topology- and policy-related information exchange through a standardized inter-ALTO communication framework. This document provides a rationale for design, standardization, and implementation of the inter-ALTO communication framework.