Abstract
Nowadays, the implementation of networks using software-defined resource environments is becoming more and more widespread. As with classic IP networks, it is necessary to consider possible complications that occur during connectivity failures (packet loss, unavailable services, congestion). A critical aspect when a connection fails is the time required to restore it. In Software-Defined Networks (SDN), where topologies are large, there are several ways to look for ways to improve network recovery speed. Fast Reroute solutions have been developed to solve negative impacts after link or node failure in SDN.This paper introduces current Fast Reroute mechanisms in Software-defined networking (SDN). The most used mechanisms include Openflow Fast Failover groups, OpenState failover technique, Loop-free Alternate (LFA) and Remote LFA (RLFA).
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