This object indicates a row in the ipslaEthernetGrpCtrlTable.
This value is a pseudo-random number selected by the management
station when creating a row via the
ipslaEthernetGrpCtrlStatus object.
For easy management, user can select range of numbers for
different maintenance domain.
For instance, the ipslaEthernetGrpCtrlIndex 1-100 will be
used for Domain_A, 101-200 will be used for Domain_B.
If the pseudo-random number is already in use an
'inconsistentValue' return code will be returned when set
operation is attempted.