Simple Network Management Protocol (SNMP) | 541Entity MIBSThe Entity MIB provides a mechanism for presenting hierarchies of physical entities using SNMP tables.The Entity MIB contains the following groups, which describe the physical elements and logical elementsof a managed system The following tables are implemented for the MXL Switch Platform.Physical EntityA physical entity or physical component represents an identifiable physical resource within a managedsystem. Zero or more logical entities may utilize a physical resource at any given time. Determining whichphysical components are represented by an agent in the EntPhysicalTable is an implementation-specificmatter. Typically, physical resources (e.g., communications ports, backplanes, sensors, daughter-cards,power supplies, the overall chassis), which can be managed via functions associated with one or morelogical entities, are included in the MIB.Containment TreeEach physical component may be modeled as contained within another physical component. Acontainment-tree is the conceptual sequence of entPhysicalIndex values that uniquely specifies the exactphysical location of a physical component within the managed system. It is generated by following andrecording each entPhysicalContainedIn instance up the tree towards the root, until a value of zeroindicating no further containment is found.Figure 30-29. Sample Entity MIBS outputsFTOS#show inventory optional-moduleUnit Slot Expected Inserted Next Boot Power---------------------------------------------------------0 0 QSFP+ QSFP+ AUTO Good0 1 10GBASE-T 10GBASE-T AUTO Good1 0 QSFP+ QSFP+ AUTO Good1 1 10GBASE-T 10GBASE-T AUTO Good2 0 QSFP+ QSFP+ AUTO Good2 1 SFP+ SFP+ AUTO Good
