[Detnet] I-D Action: draft-ietf-detnet-glbf-00.txt

internet-drafts@ietf.org Fri, 16 January 2026 13:34 UTC

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Subject: [Detnet] I-D Action: draft-ietf-detnet-glbf-00.txt
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Internet-Draft draft-ietf-detnet-glbf-00.txt is now available. It is a work
item of the Deterministic Networking (DETNET) WG of the IETF.

   Title:   Deterministic Networking (DetNet) Data Plane - guaranteed Latency Based Forwarding (gLBF) for bounded latency with low jitter and asynchronous forwarding in Deterministic Networks
   Authors: Toerless Eckert
            Alexander Clemm
            Stewart Bryant
            Stefan Hommes
   Name:    draft-ietf-detnet-glbf-00.txt
   Pages:   41
   Dates:   2026-01-14

Abstract:

   This memo proposes a mechanism called "guaranteed Latency Based
   Forwarding" (gLBF) as part of DetNet for hop-by-hop packet forwarding
   with per-hop deterministically bounded latency and minimal jitter.

   gLBF is intended to be useful across a wide range of networks and
   applications with need for high-precision deterministic networking
   services, including in-car networks or networks used for industrial
   automation across on factory floors, all the way to ++100Gbps
   country-wide networks.

   Contrary to other mechanisms, gLBF does not require network wide
   clock synchronization, nor does it need to maintain per-flow state at
   network nodes, avoiding drawbacks of other known methods while
   leveraging their advantages.

   Specifically, gLBF uses the queuing model and calculus of Urgency
   Based Scheduling (UBS, [UBS]), which is used by TSN Asynchronous
   Traffic Shaping [TSN-ATS]. gLBF is intended to be a plug-in
   replacement for TSN-ATN or as a parallel mechanism beside TSN-ATS
   because it allows to keeping the same controller-plane design which
   is selecting paths for TSN-ATS, sizing TSN-ATS queues, calculating
   latencies and admitting flows to calculated paths for calculated
   latencies.

   In addition to reducing the jitter compared to TSN-ATS by additional
   buffering (dampening) in the network, gLBF also eliminates the need
   for per-flow, per-hop state maintenance required by TSN-ATS.  This
   avoids the need to signal per-flow state to every hop from the
   controller-plane and associated scaling problems.  It also reduces
   implementation cost for high-speed networking hardware due to the
   avoidance of additional high-speed speed read/write memory access to
   retrieve, process and update per-flow state variables for a large
   number of flows.

The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-detnet-glbf/

There is also an HTMLized version available at:
https://datatracker.ietf.org/doc/html/draft-ietf-detnet-glbf-00

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

[Detnet] I-D Action: draft-ietf-detnet-glbf-00.txt internet-drafts