I-D Action: draft-hu-6man-ipv6-flowlabel-load-balancing-rdma-02.txt

Internet-Draft draft-hu-6man-ipv6-flowlabel-load-balancing-rdma-02.txt is now
available.

   Title:   A RoCEv2 Flow-Level Load Balancing Method Based on the IPv6 Flow Label
   Authors: Jiayuan Hu
            Jie Dong
            Yao Liu
            Xia Gong
   Name:    draft-hu-6man-ipv6-flowlabel-load-balancing-rdma-02.txt
   Pages:   10
   Dates:   2026-08-16

Abstract:

   This document proposes a method for achieving flow-level load
   balancing in RoCEv2 (RDMA over Converged Ethernet version 2)
   networks.  Traditional per-flow load balancing based on the 5-tuple
   cannot distinguish between different RDMA sessions that share the
   same 5-tuple.  This causes "elephant flows" to be hashed to the same
   path, leading to network congestion.  This method resolves this issue
   by having the ingress network device (e.g., a top-of-rack switch or
   router) parse the QP (Queue Pair) information from the IB BTH (Base
   Transport Header) and IB DETH (Datagram Extended Transport Header)
   headers of the RoCEv2 packet.  By combining this with portions of the
   IPv6 source and destination addresses as an entropy source, a CRC32
   hash algorithm generates a 20-bit value, which is then written into
   the Flow Label field of the IPv6 header.  Network devices can
   subsequently use the updated "5-tuple + Flow Label" for more granular
   flow-level load balancing, thereby effectively improving transmission
   efficiency in high-performance networks such as AI computing.

The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-hu-6man-ipv6-flowlabel-load-balancing-rdma/

There is also an HTML version available at:
https://www.ietf.org/archive/id/draft-hu-6man-ipv6-flowlabel-load-balancing-rdma-02.html

A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-hu-6man-ipv6-flowlabel-load-balancing-rdma-02

Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts


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