An index assigned for each type of redundancy group supported
on a managed system that requires its own table listing
entPhysicalVendorTypes allowed as members for its groups.
For instance, port groups have a different set of allowed
entPhysicalVendorTypes than linecard groups. So each should
have a separate ceRedunGroupTypeIndex.
For this example, a command line interface may differentiate
by using separate keywords (port-group versus linecard-group)
rather than exposing the ceRedunGroupTypeIndex to a user.