An entry in this table is created for every MVRF in the
device.
Note that many implementations may have MVRF for global
VRF (VRF0) by default in the device.
Also note that existence of the correspoding VRF in
L3VPN-MPLS-VPN-MIB is necessary for a row to exist in
this table. Deletion of corresponding VRF in
L3VPN-MPLS-VPN-MIB also results in deletion of a row here.
But deletion of a row ie deletion of a MVRF here does not
result in the deletion of the corresponding VRF in
L3VPN-MPLS-VPN-MIB.