Dear All,
We have submitted the new Informational Draft to proposes Symmetry-Driven
Asynchronous Forwarding (SDAF) with Fast Reroute for LEO satellite networks.
SDAF addresses routing black holes, micro-loops and high control-plane overhead
in LEO networks caused by dynamic topology and on-board resource constraints.
It leverages the intrinsic rotational/reflectional symmetry of LEO
constellations to enable autonomous local forwarding decisions. SDAF can
achieve microsecond-scale convergence without control-plane convergence,
protocol extensions or packet header modifications.
Datatracker page:
https://datatracker.ietf.org/doc/html/draft-luan-rtgwg-sdaf-00
Hope any of you could be interested in this topic and review it, we will also
present it in the upcoming RTGWG meeting. Much appreciate your review and
comments.
Best Regards,
Shenshen Luan
---- Forwarded Message ----
From<[email protected]>Date2/26/2026 00:21ToHou
Dongxu<[email protected]>,
Mingliang Ke<[email protected]>,
Shenshen Luan<[email protected]>,
Wenting Wei<[email protected]>,
Xiao Min<[email protected]>Subject【SPAM】 New Version Notification for
draft-luan-rtgwg-sdaf-00.txt
A new version of Internet-Draft draft-luan-rtgwg-sdaf-00.txt has been
successfully submitted by Wenting Wei and posted to the
IETF repository.
Name: draft-luan-rtgwg-sdaf
Revision: 00
Title: Symmetry-Driven Asynchronous Forwarding with Fast Reroute for LEO
Satellite Networks (SDAF)
Date: 2026-02-25
Group: Individual Submission
Pages: 16
URL: https://www.ietf.org/archive/id/draft-luan-rtgwg-sdaf-00.txt
Status: https://datatracker.ietf.org/doc/draft-luan-rtgwg-sdaf/
HTMLized: https://datatracker.ietf.org/doc/html/draft-luan-rtgwg-sdaf
Abstract:
Interior Gateway Protocols (IGPs) such as OSPF are commonly employed
in satellite networks to address topology awareness and autonomous
routing in response to link interruptions, link/node failures, and
subsequent repairs. However, IGP-based approaches suffer from
inherent limitations. Synchronization delays between the control
plane and the forwarding plane can cause routing black holes, while
asynchronous convergence across nodes may induce micro-loops (as
described in prior work), leading to packet loss and congestion.
These issues are particularly exacerbated in satellite networks
characterized by highly dynamic topologies, long inter-satellite
propagation delays, and constrained on-board computing resources.
This document describes the Symmetry-Driven Asynchronous Forwarding
(SDAF) mechanism, which leverages the intrinsic symmetry of toroidal
topologies in satellite networks. Low Earth Orbit (LEO) satellite
constellations are typically composed of multiple circular orbital
planes, forming a toroidal topology by inter-satellite links. SDAF
autonomously triggers and processes reverse flows based solely on
local link-state information, without requiring control-plane
convergence, protocol extensions, or packet header modifications.
SDAF is fully compatible with existing protocols and technologies
such as OSPFv3, IS-IS, and MPLS, and is specifically tailored to the
resource-constrained nature of satellite systems. It achieves
microsecond-scale convergence and low packet loss under failure
conditions.
Simulation results and tests conducted on actual satellite routers
demonstrate that the SDAF mechanism significantly suppresses packet
loss caused by routing black holes and micro-loops, while also
alleviating link congestion and packet reordering issues.
The IETF Secretariat
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