POWER-ETHERNET-OLD-MIB

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Organization: IETF Ethernet Interfaces and Hub MIB Working Group

Last Updated: 2002-10-19

Category: Power Management

Description: Provides a legacy, pre-RFC 3621 Power over Ethernet MIB covering PSE port power control and detection status.

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What Is POWER-ETHERNET-OLD-MIB?

POWER-ETHERNET-OLD-MIB is an early IETF Ethernet Interfaces and Hub MIB Working Group draft MIB (extending EtherLike-MIB) for managing IEEE 802.3af Power over Ethernet (PoE), predating the standardized POWER-ETHERNET-MIB. Its PSE (Power Sourcing Equipment) port table records group/port index, admin enable, power-pair control ability and selection, detection control/status, power priority, power-maintenance status, MPS-absent and over-current counters, port type, and power classification, a PD (Powered Device) port table records admin enable, and a main-PSE table records available power, operational status, and consumption power. As a configuration/hardware-status MIB it lets an administrator confirm PoE power budget and per-port power classification before adding more powered devices. It is deployed on early IEEE 802.3af PoE-capable Ethernet switches. Engineers can download the POWER-ETHERNET-OLD-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in POWER-ETHERNET-OLD-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Early IEEE 802.3af PoE-capable Ethernet switches

Monitoring Examples

An administrator checks aPethMainPseConsumptionPower against aPethMainPsePower to confirm there's enough PoE power budget remaining before connecting another powered device to an early 802.3af switch.

What Can Be Monitored

PoE power budget and per-port power classification

Imported Objects

From EtherLike-MIB

dot3	OBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
Integer32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

From SNMPv2-TC

TruthValue

How to Use in IPNetwork Monitor

Example using aPethPsePortMPSAbsentCounter OID:

Select an Early IEEE 802.3af PoE-capable Ethernet switch as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type aPethPsePortMPSAbsentCounter into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. Counts the number of times that the aPethPsePortPowerMaintenanceStatus attribute changes from any value to the value mPSAbsent(3). On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
aPowerEthernetMIB	1.3.6.1.2.1.10.7.20			The MIB module for for managing Powered Devices (PD) or Power Source Equipment (PSE) working according to the IEEE 802.af Powered Ethernet (DTE Power via MDI) standard. The following terms are used throughout this MIB module. For complete formal definitions, the IEEE 802.3 standards should be consulted wherever possible: Group - A recommended, but optional, entity defined by the IEEE 802.3 management standard, in order to support a modular numbering scheme. The classical example allows an implementor to represent field-replaceable units as groups of ports, with the port numbering matching the modular hardware implementation. Port - This entity identifies the port within the group for which this entry contains information. The numbering scheme for ports is implementation specific.
aPethObjects	1.3.6.1.2.1.10.7.20.1
aPethPsePortTable	1.3.6.1.2.1.10.7.20.1.1		not-accessible	A table of objects that display and control the power characteristics power Ethernet ports on a Power Source Entity (PSE) device. This group will be implemented in managed power Ethernet switches and mid-span devices.
aPethPsePortEntry	1.3.6.1.2.1.10.7.20.1.1.1		not-accessible	A set of objects that display and control the power characteristics of a power Ethernet PSE port.
INT aPethPsePortGroupIndex	1.3.6.1.2.1.10.7.20.1.1.1.1	INTEGER	not-accessible	This variable uniquely identifies the group containing the port to which a power Ethernet PSE is connected. Group means box in the stack, module in a rack and the value 1 MUST be used for non-modular devices . aPethPseMidSpanGroupCapacity is the number of Mid-Span PSE groups that can be contained within the Mid-Span PSE.
INT aPethPsePortIndex	1.3.6.1.2.1.10.7.20.1.1.1.2	INTEGER	not-accessible	This variable uniquely identifies the power Ethernet PSE port within group aPethPseGroupIndex to which the power Ethernet PSE entry is connected.
INT aPethPsePortAdminEnable	1.3.6.1.2.1.10.7.20.1.1.1.3	INTEGER	read-write	Enables power supply on this port. Setting this object at a value enable(1) enables power and detection mechanism for this port. Setting this object at a value disable(2) disables power for this port.
T/F aPethPsePortPowerPairsControlAbility	1.3.6.1.2.1.10.7.20.1.1.1.4	TruthValue	read-only	Describes the capability of controlling the power pairs functionality to switch pins for sourcing power. The value true indicate that the device has the capability to control the power pairs
INT aPethPsePortPowerPairs	1.3.6.1.2.1.10.7.20.1.1.1.5	INTEGER	read-write	Describes or controls the pairs in use. If the value of aPethPsePortPowerPairsControl is true, this object is writable. A value of signal(1) menas that the signal pairs only are in use. A value of spare(2) means that the spare pairs only are in use.
INT aPethPsePortPowerDetectionControl	1.3.6.1.2.1.10.7.20.1.1.1.6	INTEGER	read-write	Controls the power detection mechanism of the port. Setting the value auto(1) enables the power detection mechanism of the port. Setting the value test(2) puts the port in a testmode: force continuous discovery without applying power regardless of whether PD detected.
INT aPethPsePortDetectionStatus	1.3.6.1.2.1.10.7.20.1.1.1.7	INTEGER	read-only	Describes the operational status of the port PD detection. A value of disabled(1)- indicates that the PSE State diagram is in the state IDLE A value of searching(2)- indicates that the PSE State diagram is in the state DETECTION, CLASSIFICATION, SIGNATURE_INVALID or BACKOFF. A value of deliveringPower(4) - indicates that the PSE State diagram is in the state POWER_UP, POWER_ON or POWER_OFF. A value of fault(5) - indicates that the PSE State diagram is in the state TEST_ERROR or the state IDLE due to the variable error condition. Faults detected are vendor specific. A value of test(7) - indicates that the PSE State diagram is in the state TEST_MODE. A value of denyLowPriority(8) indicates that the port was disabled by the power management system, in order to keep active higher priority ports.
INT aPethPsePortPowerPriority	1.3.6.1.2.1.10.7.20.1.1.1.8	INTEGER	read-write	This object controls the priority of the port from the point of view of a power management algorithm. The priority that is set by this variable could be used by a control mechanism that prevents over current situations by disconnecting first ports with lower power priority. Ports that connect devices critical to the operation of the network - like the E911 telephones ports - should be set to higher priority.
INT aPethPsePortPowerMaintenanceStatus	1.3.6.1.2.1.10.7.20.1.1.1.10	INTEGER	read-only	The value ok(1) indicates the Power Maintenance Signature is present and the overcurrent condition has not been detected. The value overCurrent (2) indicates an overcurrent condition has been detected. The value mPSAbsent(3) indicates that the Power Maintenance Signature is absent.
C32 aPethPsePortMPSAbsentCounterEx	1.3.6.1.2.1.10.7.20.1.1.1.11	Counter32	read-only	Counts the number of times that the aPethPsePortPowerMaintenanceStatus attribute changes from any value to the value mPSAbsent(3).
C32 aPethPsePortOverCurrentCounter	1.3.6.1.2.1.10.7.20.1.1.1.12	Counter32	read-only	Counts the number of times that the aPSEPowerCurrentStatus attribute changes from any value to the value overCurrent(2).
INT aPethPsePortType	1.3.6.1.2.1.10.7.20.1.1.1.13	INTEGER	read-write	A manager will set the value of this variable to a value that indicates the type of the device that is connected to theport. This value can be the result of the mapping the address of the station connected to the port and of the value of the aPethPdPortType of the respective PD port.
INT aPethPsePortPowerClassifications	1.3.6.1.2.1.10.7.20.1.1.1.14	INTEGER	read-only	Classification is a way to tag different terminals on the Power over LAN network according to their power consumption. Devices such as IP telephones, WLAN access points and others, will be classified according to their power requirements. The value is only valid while a valid PD is being detected as indicated by the attribute aPethPsePortDetectionStatus reporting the value or deliveringPower(4).
aPethPdPortTable	1.3.6.1.2.1.10.7.20.1.2		not-accessible	A table of objects that display and control the power characteristics power Ethernet ports on a Powered Device(PD) device. This group will be implemented in managed powered and mid-span devices.
aPethPdPortEntry	1.3.6.1.2.1.10.7.20.1.2.1		not-accessible	A set of objects that display and control the power characteristics of a Powered Device port.
INT aPethPdPortIndex	1.3.6.1.2.1.10.7.20.1.2.1.1	INTEGER	not-accessible	An index value that uniquely identifies an interface to a PD device. The interface identified by a particular value of this index is the same interface as identified by the same value of ifIndex. The mapping between the ifIndex values and the numbering of the port on the device is an implementation issue.
INT aPethPdPortAdminEnable	1.3.6.1.2.1.10.7.20.1.2.1.2	INTEGER	read-write	This value identifies the operational state of the PD functions. An interface which can provide the PD functions will be enabled to do so when this attribute has the value enable. When this attribute has the value disable the interface will act as it would if it had no PD function.
aPethMainPseObjects	1.3.6.1.2.1.10.7.20.1.3
aPethMainPseTable	1.3.6.1.2.1.10.7.20.1.3.1		not-accessible	A table of objects that display and control the Main power on a PSE device. Example - an Ethernet switch midspan device can control an Ethnternet port and the Main Power supply unit's.
aPethMainPseEntry	1.3.6.1.2.1.10.7.20.1.3.1.1		not-accessible	A set of objects that display and control the Main power of a PSE.
INT aPethMainPseGroupIndex	1.3.6.1.2.1.10.7.20.1.3.1.1.1	INTEGER	not-accessible	This variable uniquely identifies the group to which power Ethernet PSE is connected.Group means (box in the stack, module in a rack) and the value 1 MUST be used for non-modular devices
I32 aPethMainPsePower	1.3.6.1.2.1.10.7.20.1.3.1.1.2	Integer32	read-only	The nominal power of the PSE expressed in Watts.
INT aPethMainPseOperStatus	1.3.6.1.2.1.10.7.20.1.3.1.1.3	INTEGER	read-only	The operational status of the main PSE.
G32 aPethMainPseConsumptionPower	1.3.6.1.2.1.10.7.20.1.3.1.1.4	Gauge32	read-only	Measured usage power expressed in Watts.
INT aPethMainPseBackupPresent	1.3.6.1.2.1.10.7.20.1.3.1.1.5	INTEGER	read-only	reflects the presence of a backup PSE .
T/F aPethMainPseBackupActivated	1.3.6.1.2.1.10.7.20.1.3.1.1.6	TruthValue	read-only	- reflects the activation status of the backup PSE . The value true Backup is activated.
INT aPethMainPseUsageThreshold	1.3.6.1.2.1.10.7.20.1.3.1.1.7	INTEGER	read-write	The usage threshold expressed in percents for comparing the measured power and initiating an alarm if the threshold is exceeded.
INT aPethMainPseMaximumDcPower	1.3.6.1.2.1.10.7.20.1.3.1.1.8	INTEGER	read-write	Describes the maximum available power in Watt to be supplied by the DC backup source to this device.
aPethNotificationControl	1.3.6.1.2.1.10.7.20.1.4
aPethNotificationControlTable	1.3.6.1.2.1.10.7.20.1.4.1		not-accessible	A table of objects that display and control the Notification on a PSE device.
aPethNotificationControlEntry	1.3.6.1.2.1.10.7.20.1.4.1.1		not-accessible	A set of objects that control the Notification events.
INT aPethNotificationControlGroupIndex	1.3.6.1.2.1.10.7.20.1.4.1.1.1	INTEGER	not-accessible	This variable uniquely identifies the group. Group means box in the stack, module in a rack and it is RECOMENDED that the value 1 be used for non-modular devices
INT aPethNotificationControlEnable	1.3.6.1.2.1.10.7.20.1.4.1.1.2	INTEGER	read-write	Enable Notification from Agent
aPethNotifications	1.3.6.1.2.1.10.7.20.2
NTF aPethPsePortOnOffNotification	1.3.6.1.2.1.10.7.20.2.1			This Notification indicates if Pse Port is delivering or not power to the PD. This Notification SHOULD be sent on every status change except in the searching mode.
NTF aPethPsePortPowerMaintenanceStatusNotification	1.3.6.1.2.1.10.7.20.2.2			This Notification indicates a Port Change Status and it SHOULD be sent on every status change.
NTF aPethMainPseBackUpActivatedNotification	1.3.6.1.2.1.10.7.20.2.3			This Notification indicate BackUp is Activated or BackUp is released.
NTF aPethMainPowerUsageOnNotification	1.3.6.1.2.1.10.7.20.2.4			This Notification indicate PSE Threshold usage indication is on, the usage power is above the threshold.
NTF aPethMainPowerUsageOffNotification	1.3.6.1.2.1.10.7.20.2.5			This Notification indicate PSE Threshold usage indication off, the usage power is below the threshold.
aPethConformance	1.3.6.1.2.1.10.7.20.3
aPethCompliances	1.3.6.1.2.1.10.7.20.3.1
aPethCompliance	1.3.6.1.2.1.10.7.20.3.1.1			Describes the requirements for conformance to the Power Ethernet MIB.
aPethPseCompliance	1.3.6.1.2.1.10.7.20.3.1.2			Describes the requirements for conformance to the PSE and MID- Span.
aPethPdCompliance	1.3.6.1.2.1.10.7.20.3.1.3			Describes the requirements for conformance to the PD.
aPethPsePortNotificationGroup	1.3.6.1.2.1.10.7.20.3.1.4			Pse Notification indications
aPethMainPowerNotificationGroup	1.3.6.1.2.1.10.7.20.3.1.5			Pse Notification indications
aPethGroups	1.3.6.1.2.1.10.7.20.3.2
aPethPsePortGroup	1.3.6.1.2.1.10.7.20.3.2.1			PSE Port Objects.
aPethPdPortGroup	1.3.6.1.2.1.10.7.20.3.2.2			PD Port Objects.
aPethMainPseGroup	1.3.6.1.2.1.10.7.20.3.2.3			Main PSE Objects.
aPethNotificationControlGroup	1.3.6.1.2.1.10.7.20.3.2.4			Notification Control Objects.

RFC description

Implements a legacy (pre-RFC 3621) Power over Ethernet management MIB for PSE port power control and detection status.

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