Administrator Guide

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 MXL switch.
Physical Entity
A physical entity or physical component represents an identiable 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-specic matter. Typically, physical resources (for example,
communications ports, backplanes, sensors, daughter-cards, power supplies, and 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 species 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.
Example of the Entity MIBS Outputs
Dell#show inventory optional-module
Unit Slot Expected Inserted Next Boot Power
-----------------------------------------
0 0 QSFP+ QSFP+ AUTO Good
0 1 10GBASE-T 10GBASE-T AUTO Good
1 0 QSFP+ QSFP+ AUTO Good
1 1 10GBASE-T 10GBASE-T AUTO Good
2 0 QSFP+ QSFP+ AUTO Good
2 1 SFP+ SFP+ AUTO Good
The status for the MIBS is as follows:
vijayakrishnan@tapti[3:42pm] : /tftpboot > snmpwalk -c public -v 2c 10.16.130.135
1.3.6.1.2.1.47.1.1.1.1.2
SNMPv2-SMI::mib-2.47.1.1.1.1.2.1 = ""
SNMPv2-SMI::mib-2.47.1.1.1.1.2.2 = STRING: "PowerConnect MXL 10/40GbE"
SNMPv2-SMI::mib-2.47.1.1.1.1.2.3 = STRING: "Module 0"
SNMPv2-SMI::mib-2.47.1.1.1.1.2.4 = STRING: "Unit: 0 Port 1 10G Level"
SNMPv2-SMI::mib-2.47.1.1.1.1.2.5 = STRING: "Unit: 0 Port 2 10G Level"
SNMPv2-SMI::mib-2.47.1.1.1.1.2.6 = STRING: "Unit: 0 Port 3 10G Level"
SNMPv2-SMI::mib-2.47.1.1.1.1.2.7 = STRING: "Unit: 0 Port 4 10G Level"
SNMPv2-SMI::mib-2.47.1.1.1.1.2.8 = STRING: "Unit: 0 Port 5 10G Level"
SNMPv2-SMI::mib-2.47.1.1.1.1.2.9 = STRING: "Unit: 0 Port 6 10G Level"
---output truncated
Troubleshooting SNMP Operation
When you use SNMP to retrieve management data from an SNMP agent on a Dell Networking router, take into account the
following behavior.
• When you query an IPv4 icmpMsgStatsInPkts object in the ICMP table by using the snmpwalk command, the output for echo
replies may display incorrectly. To correctly display this information under ICMP statistics, use the
show ip traffic
command.
• When you query an icmpStatsInErrors object in the icmpStats table by using the snmpget or snmpwalk command, the output
for IPv4 addresses may display incorrectly. To correctly display this information under IP and ICMP statistics, use the show ip
traffic
command.
Simple Network Management Protocol (SNMP)
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