PoE-MIB

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Organization: D-Link Corp.

Last Updated: 2010-07-02

Category: Power Management

Description: Manages Power over Ethernet port configuration, power class negotiation, and per-port power budget on D-Link switches.

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What Is PoE-MIB?

PoE-MIB is a D-Link enterprise-proprietary MIB for managing Power over Ethernet (PoE) on D-Link switches. It belongs to the switch-hardware management area and exposes per-port PoE configuration, including power class negotiation and per-port power budget allocation for connected powered devices such as IP phones, cameras, and wireless access points. Its central monitoring value is hardware power-delivery status: whether a port is supplying power, how much power is being drawn against its budget, and whether a connected device's negotiated power class is within the switch's overall power supply capacity. It has no stated dependency on other standard MIBs beyond the base IF-MIB port-indexing convention typically used for PoE port tables. It is typically deployed on D-Link access-layer switches in wiring closets that power PoE endpoints like phones, cameras, and access points. This is a heavily searched D-Link MIB, since poemib is the standard reference for monitoring Power over Ethernet port status and power budget on D-Link switches via SNMP.

IPNetwork Monitor allows you to monitor SNMP objects defined in PoE-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

D-Link managed switch

Monitoring Examples

Because no sample_objects were captured for this MIB, a concrete object-name-level scenario cannot be constructed without inventing names; in practice a D-Link PoE MIB of this kind exposes a per-port PoE table (commonly named similarly to dlinkPoEPortTable/dlinkPoEPortEntry in this vendor's other proprietary MIBs) carrying port power class, power consumption, and enable/disable status. An administrator would poll such a table to detect a port exceeding its allocated power budget or a powered device failing power negotiation, which manifests as the port being administratively enabled but showing no delivered power.

Imported Objects

From DLINK-ID-REC-MIB

dlink-common-mgmt

From RFC1213-MIB

DisplayString

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using swPoESystemInfoPowerConsumption OID:

Select a D-Link managed switch (Power over Ethernet) 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 swPoESystemInfoPowerConsumption 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. The actual momentary power consumption (in watts) in the PoE system. 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 an INTEGER-type OID, Value bounds is the most useful condition here — trigger an alert if the reading rises well above what's normal for this port, since a sustained increase often indicates a device drawing more current than expected. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
swPoEMIB	1.3.6.1.4.1.171.12.24			The Structure of PoE management for the proprietary enterprise.
swPoESystemCtrl	1.3.6.1.4.1.171.12.24.1
INT swPoESystemPowerLimit	1.3.6.1.4.1.171.12.24.1.1	INTEGER	read-write	The power budget (in watts) of the PoE sytem. The default setting is 370 W.
INT swPoESystemPowerDisconnectMethod	1.3.6.1.4.1.171.12.24.1.2	INTEGER	read-write	The power management disconnection method. When the total consumed power exceeds the power budget, the PoE controller initiates port disconnection, to prevent overloading the power supply. The controller uses one of the following two ways to implement the disconnection. deny_next_port: after the power budget has been exceeded, the next port attempting to power up is denied, regardless of its priority. deny_low_priority_port: after the power budget has been exceeded, the next port attempting to power up causes the port with the lowest priority to shut down to allow high-priority ports to power up. The default setting is deny_next_port.
INT swPoESystemManagementMode	1.3.6.1.4.1.171.12.24.1.3	INTEGER	read-write	This mode can be either power_limit mode or auto mode. power_limit: If power supplied to the port exceeds the power limit specified for it, this port will be shut down. auto: The system will automatically determine the PD class of the device connected to the port in the first stage. Normally, the PD can be classified as class 1, 2, or 3. If the PD cannot be classified, it will be classified as class 0. For class 0, it will assume that the PD may consume the max power allowed. During the power feeding stage, if the power supplied to the port exceeds the upper limit of the detected PD class, this port will be shut down. For the upper limit for each class, it is 4W for class 1 PD class, 7W for class 2, and 15.4W for class 3 PD and class 0 PD.
INT swPoESystemLedMode	1.3.6.1.4.1.171.12.24.1.4	INTEGER	read-write	Specifies if the system mode will be POE or NORMAL.
INT swPoESystemCtrlLegacyPD	1.3.6.1.4.1.171.12.24.1.6	INTEGER	read-write	The legacy PD detection state. Enables or disables legacy PD detection on all PoE port.
swPoESystemStackingCtrlTable	1.3.6.1.4.1.171.12.24.1.11		not-accessible	A table that is used to configure PoE system information based on Unit ID. The Unit ID is used for stacking.
swPoESystemStackingCtrlEntry	1.3.6.1.4.1.171.12.24.1.11.1		not-accessible	A list of PoE system information based on Unit ID.
INT swPoESystemStackingCtrlUnitId	1.3.6.1.4.1.171.12.24.1.11.1.1	INTEGER	read-only	This object indicates the device's Unit ID. A unit ID of zero denotes a stand-alone device.
INT swPoESystemStackingCtrlPowerLimit	1.3.6.1.4.1.171.12.24.1.11.1.2	INTEGER	read-write	The power budget (in watts) of the PoE sytem. The default setting is 370 W.
INT swPoESystemStackingCtrlPowerDisconnectMethod	1.3.6.1.4.1.171.12.24.1.11.1.3	INTEGER	read-write	The power management disconnection method. When the total consumed power exceeds the power budget, the PoE controller initiates port disconnection to prevent overloading the power supply. The controller uses one of the following two ways to implement the disconnection. deny_next_port: after the power budget has been exceeded, the next port attempting to power up is denied, regardless of its priority. deny_low_priority_port: after the power budget has been exceeded, the next port attempting to power up causes the port with the lowest priority to shut down to allow high-priority ports to power up. The default setting is deny_next_port.
INT swPoESystemStackingCtrlManagementMode	1.3.6.1.4.1.171.12.24.1.11.1.4	INTEGER	read-write	This mode can be either power_limit mode or auto mode. power_limit: If power supplied to the port exceeds the power limit specified for it, this port will be shut down. auto: The system will automatically determine the PD class of the device connected to the port in the first stage. Normally, the PD can be classified as class 1, 2, or 3. If the PD can not be classified, it will be classified as class 0. For class 0, it will assume that the PD may consume the max power allowed. At the power feeding stage, if the power supplied to the port exceeds the upper limit of the detected PD class, this port will be shut down. For the upper limit for each class, it is 4W for class 1 PD class, 7W for class 2, and 15.4W for class 3 PD and class 0 PD.
INT swPoESystemStackingCtrlLedMode	1.3.6.1.4.1.171.12.24.1.11.1.5	INTEGER	read-write	Specifies the system mode to be POE or NORMAL.
INT swPoESystemStackingCtrlLegacyPD	1.3.6.1.4.1.171.12.24.1.11.1.6	INTEGER	read-write	The legacy PD detection state. Enables or disables legacy PD detection on PoE unit.
swPoESystemInfo	1.3.6.1.4.1.171.12.24.2
swPoESystemInfoTable	1.3.6.1.4.1.171.12.24.2.1		not-accessible	A table that contains PoE system information based on Unit ID. The Unit ID is used for stacking.
swPoESystemInfoEntry	1.3.6.1.4.1.171.12.24.2.1.1		not-accessible	A list of PoE system information based on Unit ID.
INT swPoESystemInfoUnitId	1.3.6.1.4.1.171.12.24.2.1.1.1	INTEGER	read-only	This object indicates the device's Unit ID. A unit ID of zero denotes a stand-alone device.
INT swPoESystemInfoPowerConsumptionEx	1.3.6.1.4.1.171.12.24.2.1.1.2	INTEGER	read-only	The actual momentary power consumption (in watts) in the PoE system.
INT swPoESystemInfoPowerRemained	1.3.6.1.4.1.171.12.24.2.1.1.3	INTEGER	read-only	The actual momentary remaining power (in watts) in the PoE system.
INT swPoESystemInfoPowerLimit	1.3.6.1.4.1.171.12.24.2.1.1.4	INTEGER	read-only	The power budget (in watts) of the PoE sytem. The default setting is 370 W.
INT swPoESystemInfoPowerDisconnectMethod	1.3.6.1.4.1.171.12.24.2.1.1.5	INTEGER	read-only	The power management disconnection method. When the total consumed power exceeds the power budget, the PoE controller initiates port disconnection to prevent overloading the power supply. The controller uses one of the following two ways to implement the disconnection. deny_next_port: after the power budget has been exceeded, the next port attempting to power up is denied, regardless of its priority. deny_low_priority_port: after the power budget has been exceeded, the next port attempting to power up causes the port with the lowest priority to shut down to allow high-priority ports to power up. The default setting is deny_next_port.
INT swPoESystemInfoManagementMode	1.3.6.1.4.1.171.12.24.2.1.1.6	INTEGER	read-only	This mode can be either power_limit mode or auto mode. power_limit: If power supplied to the port exceeds the power limit specified for it, this port will be shut down. auto: The system will automatically determine the PD class of the device connected to the port in the first stage. Normally, the PD can be classified as class 1, 2, or 3. If the PD can not be classified, it will be classified as class 0. For class 0, it will assume that the PD may consume the max power allowed. At the power feeding stage, if the power supplied to the port exceeds the upper limit of the detected PD class, this port will be shut down. For the upper limit for each class, it is 4W for class 1 PD class, 7W for class 2, and 15.4W for class 3 PD and class 0 PD.
INT swPoESystemInfoLegacyPD	1.3.6.1.4.1.171.12.24.2.1.1.7	INTEGER	read-only	The current status of legacy PD detection.
swPoEPortCtrl	1.3.6.1.4.1.171.12.24.3
swPoEPortCtrlTable	1.3.6.1.4.1.171.12.24.3.1		not-accessible	A table that contains PoE configuration about every port in this stack. If a device has N ports, then the 1 -- N ports describe the port number of BoxId 1 device; N+1 -- 2N describe the port number of BoxId 2 device; 2N+1 -- 3N describe the port number of BoxId 2 device; ......
swPoEPortCtrlEntry	1.3.6.1.4.1.171.12.24.3.1.1		not-accessible	A list of PoE configurations for each port of the device in this stack.
INT swPoEPortCtrlPortIndex	1.3.6.1.4.1.171.12.24.3.1.1.1	INTEGER	read-only	This object indicates the devices' port number in this stack. If a device has N ports, then the 1 -- N ports describe the port number of BoxId 1 device; N+1 -- 2N describe the port number of BoxId 2 device; 2N+1 -- 3N describe the port number of BoxId 2 device; ......
INT swPoEPortCtrlState	1.3.6.1.4.1.171.12.24.3.1.1.2	INTEGER	read-write	The PoE port state. Enables or disables the PoE function on the specific port. The default setting is enable.
INT swPoEPortCtrlPriority	1.3.6.1.4.1.171.12.24.3.1.1.3	INTEGER	read-write	The PoE port priority. Port priority affects power-up order (after a rest, the ports are powered up according to their priority) and shutdown order (when exceeding the power budget, the ports are shut down according to their priority if power_disconnect_method is set to deny_low_priority_port) Default setting is low.
INT swPoEPortCtrlPowerLimit	1.3.6.1.4.1.171.12.24.3.1.1.4	INTEGER	read-write	There are 4 pre-defined values for users' convenience to set the upper power limit for class 0, class 1, class 2, and class 3. class_0: 15400mW (The maximum power provided by PSE (switch) is 12.95 W + power loss on cable) class_1: 4000mW (The maximum power provided by PSE is 3.84 W + power loss on cable) class_2: 7000mW (The maximum power provided by PSE is 6.49 W + power loss on cable) class_3: 15400mW (The maximum power provided by PSE is 12.95 W + power loss on cable) user-defined: User can select this setting and configure the range in swPoEPortCtrlUserDefined.
INT swPoEPortCtrlUserDefined	1.3.6.1.4.1.171.12.24.3.1.1.5	INTEGER	read-write	User defined per-port power limit (in milliwatts). If a port exceeds 10% of its power limit, the PoE system will shut down that port. The default setting is 15400 mW. Note: This object is valid only while the swPoEPortCtrlPowerLimit object is configured as user-defined.
STR swPoEPortCtrlTimeRangeName	1.3.6.1.4.1.171.12.24.3.1.1.6	SnmpAdminString	read-write	Specifies the time_range that applies to the port of the POE.If time range is configured, power can only be supplied during the period specified by the time range.
swPoEPortInfo	1.3.6.1.4.1.171.12.24.4
swPoEPortInfoTable	1.3.6.1.4.1.171.12.24.4.1		not-accessible	A table that contains PoE information about every port in this stack. If a device has N ports, then the 1 -- N ports describe the port number of BoxID 1 device; N+1 -- 2N describe the port number of BoxID 2 device; 2N+1 -- 3N describe the port number of BoxID 2 device; ......
swPoEPortInfoEntry	1.3.6.1.4.1.171.12.24.4.1.1		not-accessible	A list of PoE information for each port of the device in this stack.
INT swPoEPortInfoPortIndex	1.3.6.1.4.1.171.12.24.4.1.1.1	INTEGER	read-only	This object indicates the devices' port number in this stack. If a device has N ports, then the 1 -- N ports describe the port number of BoxId 1 device; N+1 -- 2N describe the port number of BoxID 2 device; 2N+1 -- 3N describe the port number of BoxID 2 device; ......
INT swPoEPortInfoClass	1.3.6.1.4.1.171.12.24.4.1.1.2	INTEGER	read-only	The power class of the PD according to 802.3af definitions: class 0: PD power consumption is within 0.44-12.95 watts, class 1: PD power consumption is within 0.44-3.84 watts, class 2: PD power consumption is within 3.84-6.49 watts, class 3: PD power consumption is within 6.49-12.95 watts, class 4: is reserved for future use.
INT swPoEPortInfoPower	1.3.6.1.4.1.171.12.24.4.1.1.3	INTEGER	read-only	The port power consumption (in milliwatts).
INT swPoEPortInfoVoltage	1.3.6.1.4.1.171.12.24.4.1.1.4	INTEGER	read-only	The port input line voltage (in decivolts).
INT swPoEPortInfoCurrent	1.3.6.1.4.1.171.12.24.4.1.1.5	INTEGER	read-only	The port current (calculated in milliamps).
STR swPoEPortInfoStatus	1.3.6.1.4.1.171.12.24.4.1.1.6	DisplayString	read-only	The string describes the PoE port current status.
INT swpoEPortInfoLedStatus	1.3.6.1.4.1.171.12.24.4.1.1.7	INTEGER	read-only	The LED display for PoE port status. on (1): power is provided to the port on which a 802.3af-compliant or legacy PD is connected, off(2): no power is provided to the port where there aren't any errors, error(3): some error happens on the port, like overload, underload, short,...or power budget exceeded conditions.

RFC description

Power over Ethernet (PoE) system control and port-level power delivery management.

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Download PoE-MIB

What Is PoE-MIB?

Supported Devices

Monitoring Examples

This MIB depends on

Related MIBs

How to Use in IPNetwork Monitor

RFC description