[CAUSE] The notification tmnxMcRingNodeLocOperStateChgd is generated upon a change of the operational state of a provisioned ring node as monitored by the local chassis, or when an unprovisioned ring node appears or disappears. unknown : none notProvisioned : the node is configured on the peer but not on this system; configErr : the local configuration of the node is incorrect notTested : the ring node connectivity verification is shut down; testing : temporary state; connected : none disconnected : none [EFFECT] unknown : none notProvisioned : no effect; configErr : no effect; notTested : no effect; testing : no effect; the effect of the operational state of the ring node depends on the operational state of the ring; only when the operational state of the ring is 'broken'. connected : ... all MAC addresses associated with this ring node are put on the SAP; disconnected : ... all MAC addresses associated with this ring node are put on the shunt; [RECOVERY] Recovery is only required if the operational state of the ring is 'broken'. Repair the ring connection with the peer.