This object identifies ID of the main Ring to which the sub-ring is connected. Upon configuration, this sub-ring will get added to the sub-ring list maintained by the Main Ring. Main ring will given the virtual channel status change indication to all the sub-rings present in its sub-ring list. This value must be configured on both the inter-connected nodes of the main ring. Only ring id's of rings created in the fsErpsRingTable can be configured for this object. To remove the association of the main ring id from the sub-ring, a value of zero should be configured for this object.