When there is no faulty link on a ring network, Ethernet Ring Protection Switching (ERPS) can eliminate loops on the network. When a link fails on the ring network, ERPS can immediately restore communication between nodes on the network. ERPSv2, compatible with ERPSv1, supports multi-ring topologies and association with connectivity fault management (CFM), in addition to ERPSv1 functions such as single ring topologies and multi-instance.