RFC 8333

Micro-loop Prevention by Introducing a Local Convergence Delay, March 2018

Canonical URL:
https://www.rfc-editor.org/rfc/rfc8333.txt
File formats:
Plain TextPDF
Status:
PROPOSED STANDARD
Authors:
S. Litkowski
B. Decraene
C. Filsfils
P. Francois
Stream:
IETF
Source:
rtgwg (rtg)

Cite this RFC: TXT  |  XML

DOI:  10.17487/RFC8333

Discuss this RFC: Send questions or comments to rtgwg@ietf.org

Other actions: Submit Errata  |  Find IPR Disclosures from the IETF


Abstract

This document describes a mechanism for link-state routing protocols that prevents local transient forwarding loops in case of link failure. This mechanism proposes a two-step convergence by introducing a delay between the convergence of the node adjacent to the topology change and the network-wide convergence. Because this mechanism delays the IGP convergence, it may only be used for planned maintenance or when Fast Reroute (FRR) protects the traffic during the time between the link failure and the IGP convergence. The mechanism is limited to the link-down event in order to keep the mechanism simple. Simulations using real network topologies have been performed and show that local loops are a significant portion (>50%) of the total forwarding loops.


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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