The clear command is described in the ITU-T G.8032 (Standard for ERPS). This command allows the ERPS ring to administratively return (revert) to idle state and trigger (on the owner) the transmission of NR,RB messages that return all other nodes back to the idle state from the pending state. If it is an R-APS (NR, RB) message without a DNF indication, all Ethernet ring nodes perform a necessary flush FDB. In the revertive-mode of operation, after the link failure is cleared in the ring, the traffic channel reverts (the RPL owner node blocks its RPL port and transmits an R-APS (NR, RB) message in both directions, repeatedly) after the expiration of a WTR timer. With the clear command, the traffic channel can be made to revert without waiting for the WTR to expire. When you issue a clear command for non-revertive mode at the RPL owner node, the non-revertive operation is cleared and the traffic channel is reverted. Upon receiving an R-APS (NR, RB) message, any blocking Ethernet ring node should unblock its non-failed ring port.
To issue the clear command, use the command:
configure erps ring-name dynamic-state [force-switch | manual-switch | clear] port slot:port