This object indicates the list of VLAN groups mapped to the ring entry. If the ring is running in portBased protection mode then this object will not have any effect. This object can be used when list of Vlan Groups are to be mapped with the ring. To map single Vlan Group with the ring, the MIB object 'fsErpsRingProtectedVlanGroupId' should be used. Protected vlan group List can be modified without making the row status of the ring entry as not in service. Example: Consider VlanGroup 10 is mapped to a Ring entry Ring 1 using mib object fsErpsRingProtectedVlanGroupId. Now configuring a list of VlangGroups 20,30 and 40 to Ring entry Ring 1 by using this mib object will result in the addition of vlan group 10 mapped via fsErpsRingProtectedVlanGroupId to the Vlan group list. Therefore the VlanGroup mapping with Ring entry Ring 1 will contain the list of vlan groups 10,20,30 and 40.