Contents

Configuring PoE·· 1

Overview· 1

Configuration restrictions and guidelines· 1

PoE configuration task list 2

Enabling PoE· 2

Enabling PoE for a PSE· 2

Enabling PoE for a PI 3

Enabling nonstandard PD detection· 3

Configuring the PoE power 4

Configuring the maximum PoE power 4

Configuring the maximum PSE power 4

Configuring the maximum PI power 5

Configuring PoE power management 5

Configuring PSE power management 5

Configuring PI power management 6

Configuring PoE monitoring· 8

Configuring PSE power monitoring· 8

Enabling PoE over-temperature protection· 8

Configuring a PI by using a PoE profile· 8

Configuring a PoE profile· 9

Applying a PoE profile· 9

Upgrading PSE firmware in service· 9

Displaying and maintaining PoE· 10

PoE configuration example· 11

Troubleshooting PoE· 12

Failure to set the priority of a PI to critical 12

Failure to apply a PoE profile to a PI 12

 

Configuring PoE

Overview

IEEE 802.3af-compliant power over Ethernet (PoE) enables a network device to supply power to terminals over twisted pair cables.

As shown in Figure 1, a PoE system includes the following elements:

·     PoE power supply—The PoE power supply provides power for the entire PoE system.

·     PSE—A power sourcing equipment (PSE) detects and classifies powered devices (PDs), supplies power to PDs, and monitors the PD power. PSEs include endpoint PSEs and midspan PSEs.

H3C PSEs are endpoint PSEs. An H3C PSE can be a device with only one built-in PSE, or it can be a PoE-capable interface card on a device. A device with multiple PSEs uses PSE IDs to identify different PSEs. The display poe device command displays the mapping between a PSE ID and the slot or subslot number of a PSE. The S7500E switch supports multiple PSEs.

·     PI—A power interface (PI) is a PoE-capable Ethernet interface on a PSE.

·     PD—A PD receives power from the PSE.

PDs include IP telephones, APs, portable chargers, POS terminals, and Web cameras.

You can also connect a PD to a redundant power source for reliability.

Figure 1 PoE system diagram

 

Configuration restrictions and guidelines

Only a switch (except the non-PoE S7506E) installed with the LSQ1GV48SD0, LSQ3GV48SC0, or LSQM4GV48SC0 interface module supports PoE.

PoE configuration task list

You can configure a PI directly on the port or by configuring a PoE profile and applying the PoE profile to the PI. To configure one PI, configure it on the port. To configure multiple PIs in batches, use the PoE profile.

Before configuring PoE, make sure the PoE power supply and PSE are operating correctly. Otherwise, either you cannot configure PoE or the PoE configuration cannot take effect.

To configure PoE, perform the following tasks:

 

Tasks at a glance
(Required.) Enabling PoE: ·     Enabling PoE for a PSE ·     Enabling PoE for a PI
(Optional.) Enabling nonstandard PD detection
(Optional.) Configuring the PoE power: ·     Configuring the maximum PoE power ·     Configuring the maximum PSE power ·     Configuring the maximum PI power
(Optional.) Configuring PoE power management: ·     Configuring PSE power management ·     Configuring PI power management
(Optional.) Configuring the PoE monitoring function: ·     Configuring PSE power monitoring ·     Enabling PoE over-temperature protection
(Optional.) Configuring a PI by using a PoE profile: ·     Configuring a PoE profile ·     Applying a PoE profile
(Optional.) Upgrading PSE firmware in service

 

Enabling PoE

This section describes how to enable PoE for a PSE and a PI.

Enabling PoE for a PSE

The system only supplies power to and reserves power for PoE-enabled PSEs.

You can enable PoE for a PSE if the PSE will not result in PoE power overload. PoE overload occurs when the sum of the power consumption of all PSEs exceeds the maximum power of PoE power supply. The maximum power of PoE power supply depends on the hardware specifications of the PoE power supply and the configuration.

If the PSE will result in PoE power overload, you can enable PoE for the PSE only when PoE power management is enabled. For more information about PSE power management, see "Configuring PSE power management."

To enable PoE for a PSE:

 

Step	Command	Remarks
1.     Enter system view.	system-view	N/A
1.     Enable PoE for the PSE.	poe enable pse pse-id	By default, this function is disabled.

 

Enabling PoE for a PI

The system only supplies power to and reserves power for PDs connected to PoE-enabled PIs.

You can enable PoE for a PI if the PI will not result in PSE power overload. PSE overload occurs when the sum of the power consumption of all PIs exceeds the maximum power of the PSE. The maximum PSE power is configurable.

If the PI will result in PSE power overload, you can enable PoE for the PI only when PI power management is enabled. For more information about PI power management, see "Configuring PI power management."

The PSE supplies power over the Category 3 or Category 5 twisted pair cable connected to a PI in the following modes:

·     Over signal wires—The PSE uses data pairs (pins 1, 2, 3, and 6) to supply DC power to PDs.

·     Over spare wires—The PSE uses spare pairs (pins 4, 5, 7, and 8) to supply DC power to PDs.

 

NOTE: A PSE can supply power to a PD directly only when the PSE and PD use the same power transmission mode. If the PSE and PD use different power transmission modes, you must change the order of the lines in the twisted pair cable to supply power to the PD.

 

To enable PoE for a PI:

 

Step	Command	Remarks
1.     Enter system view.	system-view	N/A
2.     Enter PI view.	interface interface-type interface-number	N/A
3.     Enable PoE for the PI.	poe enable	By default, PoE is disabled for a PI.
4.     (Optional.) Configure power transmission mode.	poe mode { signal | spare }	The default mode is power over signal cables (signal). The device does not support the spare mode.
5.     (Optional.) Configure a description for the PD connected to the PI.	poe pd-description text	By default, no description is available for the PD connected to the PI.

 

Enabling nonstandard PD detection

Step	Command	Remarks
1.     Enter system view.	system-view	N/A
2.     Enable nonstandard PD detection.	poe legacy enable pse pse-id	By default, nonstandard PD detection is disabled. The PSE detects only IEEE 802.3af-compliant standard PDs and supplies power to them.

 

Configuring the PoE power

This section describes how to configure the maximum PoE power, the maximum PSE power, and the maximum PI power.

Configuring the maximum PoE power

The maximum PoE power is the maximum power that the device can provide to all PSEs.

The PoE power supply has a self-protection mechanism. When it is overloaded, the PoE power supply stops supplying power to all PSEs. To avoid this situation, you can configure a maximum PoE power smaller than the default maximum PoE power. After you configure the maximum PoE power, the system reallocates power based on the configured power. When PSEs require more power than the configured maximum power, the system does not supply power to new PSEs causing the power overload.

To configure the maximum PoE power:

 

Step	Command	Remarks
1.     Enter system view.	system-view	N/A
2.     Configure the maximum PoE power.	·     In standalone mode: poe power max-value max-power ·     In IRF mode: poe power chassis chassis-number max-value max-power	By default, the maximum PoE power is the total maximum power of all operating power modules in the PoE power frame.

 

Configuring the maximum PSE power

The maximum power of a PSE is the maximum power that the PSE can provide to all its attached PDs.

Follow these guidelines when you configure the maximum PSE power:

·     To avoid the PoE power overload situation, make sure the total power of all PSEs is less than the maximum PoE power.

·     The maximum power of the PSE must be greater than or equal to the total maximum power of all its critical PIs to guarantee these PIs' power.

·     On an IRF 3 system, the maximum PSE power configuration is not supported on a PEX. For more information about IRF 3 and PEXs, see Virtual Technologies Configuration Guide.

To configure the maximum PSE power:

 

Step	Command	Remarks
1.     Enter system view.	system-view	N/A
2.     Configure the maximum power for a PSE.	poe pse pse-id max-power max-power	By default, the maximum PSE power varies by PSE. You can perform the following operations to verify the default maximum power of a PSE: 1.     Execute the undo poe pse pse-id max-power command. 2.     Execute the display poe pse [ pse-id ] command.

 

Configuring the maximum PI power

The maximum PI power is the maximum power that a PI can provide to the connected PD. If the PD requires more power than the maximum PI power, the PI does not supply power to the PD.

To configure the maximum PI power:

 

Step	Command	Remarks
1.     Enter system view.	system-view	N/A
2.     Enter PI view.	interface interface-type interface-number	N/A
3.     Configure the maximum power for the PI.	poe max-power max-power	The default maximum power of the PI is 30000 milliwatts.

 

Configuring PoE power management

PoE power management includes PSE power management and PI power management.

Configuring PSE power management

PSE power management performs priority-based power allocation in PoE power overload situations. The power-supply priority levels of a PSE are critical, high, and low in descending order. If the PoE power is sufficient, you do not need to enable PSE power management.

If you do not enable PSE power management, the system supplies power based on the maximum PoE power configuration status in PoE power overload situations. For more information, see "Configuring the maximum PoE power."

If you enable PSE power management, the system supplies power based on the PSE priority when a new PSE causes PoE power overload:

 

Priority of the new PSE	PoE system operations
Low	The system does not supply power to a new PSE.
High	·     If low-priority PSEs exist, the system stops power supply to the existing low-priority PSEs, and supplies power to the new PSE. ·     If no low-priority PSEs exist, the system does not supply power to the new PSE.
Critical	·     If low-priority or high-priority PSEs exist, the system stops power supply to the existing low-priority or high-priority PSEs, and supplies power to the new PSE. ·     If no low-priority or high-priority PSEs exist, the system does not supply power to the new PSE.

 

NOTE: ·     Configuration for PSEs whose power is preempted remains unchanged. ·     On an IRF 3 system, the PSE power management configuration is not supported on a PEX. For more information about IRF 3 and PEXs, see Virtual Technologies Configuration Guide.

 

If multiple new PSEs require power supply, the system supplies power to PSEs in priority descending order. For PSEs with the same priority, the one with the smallest PSE ID takes precedence.

If multiple existing PSEs need to be stopped with power supply, the system stops power supply to PSEs in priority ascending order. For PSEs with the same priority, the one with the greatest ID takes precedence.

The system guarantees its critical PSEs uninterruptable power by reserving guaranteed PoE power. If you want a PSE to be allocated with uninterruptable power, configure it with critical priority. Otherwise, configure it with high or low priority to ensure that other PSEs can be supplied with power.

Before you configure a PSE with critical priority, make sure the remaining guaranteed power is greater than or equal to the maximum power of the PSE. The remaining guaranteed PoE power is the maximum PoE power minus the maximum power for PoE-enabled and PoE-disabled critical PSEs.

To configure PSE power management:

 

Step	Command	Remarks
1.     Enter system view.	system-view	N/A
2.     Enable PSE power management.	poe pse-policy priority	By default, PSE power management is disabled.
3.     (Optional.) Configure the power supply priority for the PSE.	poe priority { critical | high | low } pse pse-id	By default, the power supply priority for the PSE is low.

 

Configuring PI power management

PI power management enables the PSE to perform priority-based PI power management in PSE power overload situations. The power-supply priority levels of a PI are critical, high, and low in descending order. The PD priority is determined by the priority of the PI to which the PD is connected. All PSEs use the same PI power management mechanism.

If you do not enable PI power management, the PSE performs operations based on the status of the maximum PSE power upon power overload:

 

Maximum PSE power	PSE operations
Configured	The PSE stops power supply to the new PD.
Not configured	The PSE stops power supply to all PDs when the PoE self-protection mechanism is triggered.

 

If you enable PI power management, the PSE stops power supply to existing PDs causing overload or performs priority-based operations for new PDs causing overload:

 

Priority of the new PD	PSE operations
Low	The PSE does not supply power to a new PD.
High	·     If low-priority PDs exist, the PSE stops power supply to the existing low-priority PDs, and supplies power to the new PD. ·     If no low-priority PDs exist, the PSE does not supply power to the new PD.
Critical	·     If low-priority or high-priority PDs exist, the PSE stops power supply to the existing low-priority or high-priority PDs, and supplies power to the new PD. ·     If no low-priority or high-priority PDs exist, the PSE does not supply power to the new PD.

 

NOTE: Configuration for PIs whose power is preempted remains unchanged.

 

If multiple new PDs require power supply, the PSE supplies power to PDs in priority descending order. For PDs with the same priority, the one with the smallest PD ID takes precedence.

If multiple existing PDs need to be stopped with power supply, the PSE stops power supply to PDs in priority ascending order. For PDs with the same priority, the one with the greatest ID takes precedence.

The PSE guarantees its critical PIs uninterruptable power by reserving guaranteed PSE power. If you want a PI to be allocated with uninterruptable power, configure the PI with critical priority. Otherwise, configure the PI with high or low priority to ensure that other PIs can be supplied with power.

Before you configure a PI with critical priority, make sure the remaining guaranteed power is greater than or equal to the maximum power of the PI. The remaining guaranteed PSE power is the maximum PSE power minus the maximum power for PoE-enabled and PoE-disabled critical PIs.

To configure PI power management:

 

Step	Command	Remarks
1.     Enter system view.	system-view	N/A
2.     Enable PI power management.	poe pd-policy priority	By default, PI power management is disabled.
3.     Enter PI view.	interface interface-type interface-number	N/A
4.     (Optional.) Configure the power supply priority for a PI.	poe priority { critical | high | low }	By default, the power supply priority for the PSE is low.

 

Configuring PoE monitoring

When the PoE monitoring function is enabled, the system monitors PSEs, PDs, and device temperature in real time. If a specific value exceeds the threshold, the system automatically takes self-protection measures.

If a PSE starts or stops power supply to a PD, the system automatically sends a notification message. For more information, see "Configuring SNMP."

Configuring PSE power monitoring

The system monitors PSE power utilization and sends notification messages when PSE power utilization exceeds or drops below the threshold. If PSE power utilization crosses the threshold multiple times in succession, the system sends notification messages only for the first crossing. For more information about the notification message, see "Configuring SNMP."

To configure a PSE power alarm threshold:

 

Step	Command	Remarks
1.     Enter system view.	system-view	N/A
2.     Configure a power alarm threshold for the PSE.	poe utilization-threshold utilization-threshold-value pse pse-id	By default, the power alarm threshold for the PSE is 80%.

 

Enabling PoE over-temperature protection

The PoE over-temperature protection enables the system to monitor the chassis internal temperature in real time. When the temperature exceeds the upper limit or drops below the lower limit, the system disables PoE for all PIs. The upper and lower temperature limits depend on hardware specifications and are not configurable at the CLI.

To enable PoE over-temperature protection:

 

Step	Command	Remarks
1.     Enter system view.	system-view	N/A
2.     Enable PoE over-temperature protection.	poe temperature-protection enable	By default, PoE over-temperature protection is enabled.

 

Configuring a PI by using a PoE profile

A PoE profile is a set of PoE configurations. You can apply a PoE profile to one or multiple PIs. When a PD is moved to another PI, you only need to apply the PoE profile to the new PI.

You can configure a PI either on the port or by using a PoE profile. Follow these guidelines when you configure parameters for a PI:

·     The poe max-power max-power and poe priority { critical | high | low } commands must be configured in the same method.

·     If you configure a parameter twice with different methods, only the first configuration takes effect. To validate the second configuration, delete the first configuration.

Configuring a PoE profile

Step	Command	Remarks
1.     Enter system view.	system-view	N/A
2.     Create a PoE profile, and enter PoE profile view.	poe-profile profile-name [ index ]	N/A
3.     Enable PoE.	poe enable	By default, this function is disabled.
4.     (Optional.) Configure the maximum PI power.	poe max-power max-power	The default maximum PI power is 30000 milliwatts.
5.     (Optional.) Configure PoE power transmission mode.	poe mode { signal | spare }	The default mode is power over signal pins (signal). The device does not support the spare mode.
6.     (Optional.) Configure PI priority.	poe priority { critical | high | low }	The default priority is low.

 

Applying a PoE profile

You can apply a PoE profile in system view or PI view. If you perform the operation in both views, the most recent operation takes effect. To apply a PoE profile to multiple PIs, perform the operation in system view. If a PoE profile is applied, it cannot be deleted or modified before you remove its application.

A PoE profile can be applied to multiple PIs, but a PI can have only one PoE profile.

Applying a PoE profile to multiple PIs in system view

Step	Command
1.     Enter system view.	system-view
2.     Apply a PoE profile to one or multiple PIs.	apply poe-profile { index index | name profile-name } interface interface-range

 

Applying a PoE profile to a PI in PI view

Step	Command
1.     Enter system view.	system-view
2.     Enter PI view.	interface interface-type interface-number
3.     Apply the PoE profile to the interface.	apply poe-profile { index index | name profile-name }

 

Upgrading PSE firmware in service

You can upgrade the PSE firmware in service in either of the following modes:

·     Refresh mode—Updates the PSE firmware without deleting it. You can use this mode if the firmware is available.

·     Full mode—Deletes the current PSE firmware and reloads a new one. You can use this mode if the firmware is unavailable, and execution of all PoE commands fails.

If the PSE firmware upgrade fails because of interruption such as a device reboot, you can restart the device and upgrade it in full mode again. After the upgrade, restart the device manually for the new PSE firmware to take effect.

To upgrade the PSE firmware in service:

 

Step	Command
1.     Enter system view.	system-view
2.     Upgrade the PSE firmware in service.	poe update { full | refresh } filename [ pse pse-id ]

 

Displaying and maintaining PoE

Execute display commands in any view.

 

Task	Command
Display general PSE information (in standalone mode).	display poe device [ slot slot-number ]
Display general PSE information (in IRF mode).	display poe device [ chassis chassis-number slot slot-number ]
Display the power supplying information for the specified PI.	display poe interface [ interface-type interface-number ]
Display power information for PIs.	display poe interface power [ interface-type interface-number ]
Display PoE power usage information (in standalone mode).	display poe power-usage
Display PoE power usage information (in IRF mode).	display poe power-usage [ chassis chassis-number]
Display detailed PSE information.	display poe pse [ pse-id ]
Display the power supplying information for all PIs on a PSE.	display poe pse pse-id interface
Display power information for all PIs on a PSE.	display poe pse pse-id interface power
Display information about the PoE power supply (in standalone mode).	display poe-power
Display information about the PoE power supply (in IRF mode).	display poe-power [ chassis chassis-number ]
Display PoE power information (in standalone mode).	display poe-power
Display PoE power information (in IRF mode).	display poe-power [ chassis chassis-number ]
Display all information about the PoE profile.	display poe-profile [ index index | name profile-name ]
Display all information about the PoE profile applied to the specified PI.	display poe-profile interface interface-type interface-number

 

PoE configuration example

Network requirements

As shown in Figure 2, the device has two PSEs PSE 10 and PSE 16. Configure PoE to meet the following requirements:

·     Enable the device to supply power to IP telephones and APs.

·     Configure PI power management so that the PSE does not supply power to a new PD when the new PD results in PSE power overload.

·     Allocate 400 watts to PSE 10. (This example assumes that the default maximum power of PSE 16 can meet the requirements.)

·     Allocate AP B a maximum power of 9000 milliwatts.

Figure 2 Network diagram

 

Configuration procedure

# Enable PoE for the PSE.

<PSE> system-view

[PSE] poe enable pse 10

[PSE] poe enable pse 16

# Set the maximum power of PSE 10 to 400 watts.

[PSE] poe max-power 400 pse 10

# Enable PoE on GigabitEthernet 3/0/1 and GigabitEthernet 5/0/1.

[PSE] interface gigabitethernet 3/0/1

[PSE-GigabitEthernet3/0/1] poe enable

[PSE-GigabitEthernet3/0/1] quit

[PSE] interface gigabitethernet 5/0/1

[PSE-GigabitEthernet5/0/1] poe enable

[PSE-GigabitEthernet5/0/1] quit

# Enable PoE on GigabitEthernet 3/0/2, and set its power priority to critical.

[PSE] interface gigabitethernet 3/0/2

[PSE-GigabitEthernet3/0/2] poe enable

[PSE-GigabitEthernet3/0/2] poe priority critical

[PSE-GigabitEthernet3/0/2] quit

# Enable PoE on GigabitEthernet 5/0/2, and set its maximum power to 9000 milliwatts.

[PSE] interface gigabitethernet 5/0/2

[PSE-GigabitEthernet5/0/2] poe enable

[PSE-GigabitEthernet5/0/2] poe max-power 9000

Verifying the configuration

# Connect the IP telephones and APs to the PSEs to verify that they can obtain power and operate correctly. (Details not shown.)

Troubleshooting PoE

Failure to set the priority of a PI to critical

Symptom

Power supply priority configuration for a PI failed.

Solution

To resolve the problem:

1.     Increase the maximum PSE power or reduce the maximum power of the PI if the remaining guaranteed power of the PSE cannot be modified.

2.     Remove the priority that is already configured.

3.     If the problem persists, contact H3C Support.

Failure to apply a PoE profile to a PI

Symptom

PoE profile application for a PI failed.

Solution

To resolve the problem:

1.     Remove the original configurations.

2.     Modify the configurations in the PoE profile.

3.     Remove the application of the undesired PoE profile from the PI.

4.     If the problem persists, contact H3C Support.