Reference Guide

200 | Simple Network Management Protocol (SNMP)
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Entity MIBS
The 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 elements
of a managed system The following tables are implemented for the Aggregator.
• 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. Determining which physical components are represented by an agent in the EntPhysicalTable is
an implementation-specific matter. 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 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 that 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.
Figure 16-14. Sample Entity MIBS outputs
FTOS#show inventory optional-module
Unit Slot Expected Inserted Next Boot Status/Power(On/Off)
------------------------------------------------------------------------
1 0 SFP+ SFP+ AUTO Good/On
1 1 QSFP+ QSFP+ AUTO Good/On
* - Mismatch
FTOS#