A METHOD, SYSTEM AND RESILIENT PACKET RING DEVICE FOR AVOIDING LOOP AFTER FAULT RECOVERY

摘要

A method, system and resilient packet ring device for avoiding loop appearance after fault recovery. The method includes: fault recovery node sets a delay time and transmits fault recovery notifying message to inter-ring node via two directions of RPR when the fault is recovered; the fault recovery node sets its work state as normal when the delay time has elapsed; inter-ring node sets its work state based on state condition after receiving fault recovery notifying message sent by fault recovery node within delay time, namely inter-ring node judges whether to change its own work state based on its state and other inter-ring nodes' state on RPR. The method, system and device resolves the loop problem when one of two fault positions situated at two sides of inter-ring node is recovered through cooperation between fault recovery node and inter-ring node.