Micro-loop Prevention by Introducing a Local Convergence Delay
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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.