The set of zone members which form this alias
on this VSAN.
The members of an alias are identified by the
zoneMemberIndex object in the zoneMemberTable.
If a particular bit has a value of '1', then the
corresponding zone member is a part of this alias.
All other zone members have '0' in their positions
or not present in the string.
This object is read-only; changes to its value are
made by the agent as and when associated entries are
created/deleted in the zoneMemberTable.
The default value is the zero length string.