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arxiv: 2606.18170 · v1 · pith:V4JGHYDOnew · submitted 2026-06-16 · 💻 cs.NI

The Multipath Reliable Connection (MRC) Transport

Rip Sohan , Eric Spada , Eric Davis , Mark Handley , Idan Burstein , Tony Hurson , Jithin Jose , Vivek Kashyap
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Rong Pan Sayantan Sur Sreevatsa Anantharamu Aviv Barnea Adrian Caulfield Elazar Cohen Elliot Edmunds Yamin Friedman Mahdieh Ghazi Murali Guramali Torsten Hoefler Vipin Jain Abdul Kabbani Noam Katz Yanfang Le Charlie Mbariky Guglielmo Morandin Masoud Moshref Shane O'Neil Michael Papamichael Jonas Pfefferle Siva Santosh Pyla Costin Raiciu David Riddoch Karen Schramm Yuval Shpigelman Shahaf Shuler Shy Shyman Raghava Sivaramu Amin Tootoonchian Yang Wang
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keywords addscapabilitiesmultipathtransportacceleratedbest-effortcomposablecongestion
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MRC is an open, production-grade transport designed for large-scale AI/ML training over best-effort Ethernet. It extends RoCEv2 with explicit, composable primitives for per-packet multipath and sender-based congestion control, decouples packet delivery from semantic processing, adds multiple new capabilities for accelerated packet-loss recovery and adds resilience against port and path failures. This paper presents MRC and details its core capabilities and mechanisms.

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