D-Link DES-3226 Switch Management Module - Page 35

- Physical Entity A "physical entity" or "physical component" represents an identifiable physical resource within a managed system. Zero or more logical entities may utilize a physical resource at any given time. It is an implementation-specific manner as to which physical components are represented by an agent in the EntPhysicalTable. Typically, physical resources (e.g., communications ports, back planes, sensors, daughter-cards, power supplies, the overall chassis) which can be managed via Functions associated with one or more logical entities are included in the MIB. - Containment Tree Each physical component may be modeled as 'contained' within another physical component. A "containment-tree" is the conceptual sequence of entPhysicalIndex values which uniquely specifies the exact physical location of a physical component within the managed system. It is generated by 'following and recording' each 'entPhysicalContainedIn' instance 'up the tree towards the root', until a value of zero indicating no further containment is found. The Entity Physical Table can be accessed by choosing Entity under Configuration and then Physical Table. This table contains one row per physical entity. There is always at least one row for an 'overall' physical entity. DES-3226 Management 31