The value of tnEthRingSubRingInterconnectId specifies whether the Ethernet sub-ring is interconnected to an Ethernet Ring, as identified by the Ethernet Ring ID, a VPLS service (4294967295), or is not interconnected (0). A sub-ring can only be interconnected to a VPLS service (i.e. tnEthRingSubRingInterconnectId assigned the value 4294967295), if tnEthRingSubRingType is assigned the value 'nonVirtualLink (2)'. This object MUST be set to a value other than zero (0) for tnEthRingSubRingPropTopChange to be modified away from its default value. Attempts to modify this object away from its default value when tnEthRingSubRingType is set to 'none (0)' will result in an SNMP inconsistentValue error.