Review of Fast ReRoute solutions

The Fast ReRoute (FRR) is an area that addresses issues of network recovery in the event of crucial devices or line failures in the network. During the event of a failure in the ISP network, the process of network convergence starts. This process may last unpredictable time and traffic affected by the failure may be inevitably lost. FRR mechanisms work mostly on the principle of a precalculated backup route. After a failure at one of the protected nodes in the network, the FRR mechanism will use a specific backup route to redirect traffic away from the location affected by the failure. By using FRR mechanisms in the Internet Service Provider (ISP) network, we can minimize the time required for network recovery to the order of tens of milliseconds and thus ensure immediate recovery of communication after a network outage.