Ethernet Ring Protection Switching
Ethernet Ring Protection Switching, or ERPS,
Is an effort at ITU-T under G.8032 Recommendation to provide sub-50ms protection and recovery switching for Ethernet traffic in a ring topology and at the same time ensuring that there are no loops formed at the Ethernet layer. G.8032v1 supported a single ring topology and G.8032v2 supports multiple rings/ladder topology.
FDB - filtering databases
Whenever the position of the block in a ring changes due to a failure or the recovery of a failure, all ring nodes should remove all learned MAC addresses from their filtering databases (FDBs). This action, called an FDB flush, guarantees FDB consistency for a new topology.
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