The matching criteria for a group are the attribute values defined for the target class that is associated with the group. For polling and threshold groups, the target class is Port, Interface, or UnitaryComputerSystem (such as a Switch, Router, Hub, or Bridge). For device access and IP tagging filter groups, the target class is UnitaryComputerSystem.
Any managed object that meets the matching criteria for a group becomes a member of the group. When a managed object becomes a member of a group, all parameter values that are defined for the group are applied to the managed object.