17-Network Management and Monitoring Configuration Guide

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04-PoE configuration
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Configuring PoE

About PoE

Power over Ethernet (PoE) enables a network device to supply power to terminals over twisted pair cables.

PoE system

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

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

·     PSE—A power sourcing equipment (PSE) supplies power to PDs. PSE devices are classified into single-PSE devices and multiple-PSE devices.

¡     A single-PSE device has only one PSE firmware.

¡     A multiple-PSE device has multiple PSEs. A multiple-PSE device uses PSE IDs to identify different PSEs. To view the mapping between the ID and slot number of a PSE, execute the display poe device command.

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

·     PD—A powered device (PD) receives power from a 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

Protocols and standards

·     802.3af-2003, IEEE Standard for Information Technology - Telecommunications and Information Exchange Between Systems - Local and Metropolitan Area Networks - Specific Requirements - Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications - Data Terminal Equipment (DTE) Power Via Media Dependent Interface (MDI)

·     802.3at-2009, IEEE Standard for Information technology-- Local and metropolitan area networks-- Specific requirements-- Part 3: CSMA/CD Access Method and Physical Layer Specifications Amendment 3: Data Terminal Equipment (DTE) Power via the Media Dependent Interface (MDI) Enhancements

Restrictions: Hardware compatibility with PoE

This feature is supported only on the following routers:

·     MSR810-10-PoE

·     MSR 3610, MSR 3620, MSR 3620-DP, MSR 3640, and MSR 3660 routers installed with one of the following interface modules:

¡     DSIC-9FSWP

¡     HMIM-24GSWP-PoE

¡     SIC-4FSWP

 

Restrictions and guidelines: PoE configuration

You can configure a PI through either of the following ways:

·     Configure the settings directly on the PI.

·     Configure a PoE profile and apply it to the PI. If you apply a PoE profile to multiple PIs, these PIs have the same PoE features. If you connect a PD to another PI, you can apply the PoE profile of the original PI to the new PI. This method relieves the task of configuring PoE on the new PI.

You can only use one way to configure a parameter for a PI. To use the other way to reconfigure a parameter, you must first remove the original configuration.

You must use the same configuration method for the poe max-power max-power and poe priority { critical | high | low } commands.

PoE configuration tasks at a glance

To configure PoE, perform the following tasks:

1.     Enabling PoE

a.     Enabling PoE for a PSE

b.     Enabling PoE for a PI

2.     (Optional.) Configuring PD detection

¡     Enabling nonstandard PD detection

¡     Configuring a PD disconnection detection mode

3.     (Optional.) Configuring the PoE power

¡     Configuring the maximum PSE power

¡     Configuring the maximum PI power

4.     (Optional.) Configuring the PoE priority policy

¡     Configuring the PSE priority policy

¡     Configuring the PI priority policy

5.     (Optional.) Configuring PoE monitoring

¡     Configuring PSE power monitoring

6.     (Optional.) Upgrading PSE firmware in service

To use a PoE profile to enable PoE and configure the priority and maximum power for a PI, see "Configuring a PI by using a PoE profile."

Prerequisites for configuring PoE

Before you configure PoE, make sure the PoE power supply and PSEs are operating correctly.

Enabling PoE

Enabling PoE for a PSE

About enabling PoE for a PSE

After you enable PoE for a PSE, the system reserves and supplies power to the PSE.

Follow these guidelines to determine whether you can enable PoE on a PSE:

·     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 the PoE power supply.

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

Procedure

1.     Enter system view.

system-view

2.     Enable PoE for a PSE.

poe enable pse pse-id

By default, PoE is disabled on a PSE.

Enabling PoE for a PI

About enabling PoE for a PI

After you enable PoE for a PI, the system reserves and supplies power to the PD connected to the PI.

Follow these guidelines to determine whether you can enable PoE for a PI:

·     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. For information about the maximum PSE power, see "Configuring the maximum PSE power."

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

The power transmission over the Category 3 or Category 5 twisted pair cable can be implemented in either of the following modes:

·     Over signal wires—Uses data pairs (pins 1, 2, 3, and 6) for power transmission.

·     Over spare wires—Uses spare pairs (pins 4, 5, 7, and 8) for power transmission.

Restrictions and guidelines

The device supports power transmission only over signal wires.

A PSE can supply power to a PD 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.

Procedure

1.     Enter system view.

system-view

2.     Enter PI view.

interface interface-type interface-number

3.     Enable PoE for the PI.

poe enable

By default, PoE is disabled on a PI.

4.     (Optional.) Configure a description for the PD connected to the PI.

poe pd-description text

By default, no description is configured for the PD connected to the PI.

Configuring PD detection

Enabling nonstandard PD detection

About enabling nonstandard PD detection

PDs are classified into standard PDs and nonstandard PDs. Standard PDs are compliant with IEEE 802.3af and IEEE 802.3at. A PSE supplies power to a nonstandard PD only after nonstandard PD detection is enabled.

Procedure

1.     Enter system view.

system-view

2.     Enable nonstandard PD detection.

poe legacy enable pse pse-id

By default, nonstandard PD detection is disabled for a PSE.

Configuring a PD disconnection detection mode

CAUTION

CAUTION:

If you change the PD disconnection detection mode when the device is running, the connected PDs are powered off. Be aware of the impact of this operation before you perform it.

About PD disconnection detection modes

A PSE detects PD disconnection in AC mode or DC mode. The AC mode uses less power than the DC mode.

Procedure

1.     Enter system view.

system-view

2.     Configure a PD disconnection detection mode.

poe disconnect { ac | dc }

The default PD disconnection detection mode is AC mode.

Configuring the PoE power

Configuring the maximum PSE power

About the maximum PSE power

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

Restrictions and guidelines

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.

Procedure

1.     Enter system view.

system-view

2.     Configure the maximum power for a PSE.

poe pse pse-id max-power max-power

By default, the maximum power of a PSE is 37 W.

Configuring the maximum PI power

About 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.

Procedure

1.     Enter system view.

system-view

2.     Enter PI view.

interface interface-type interface-number

3.     Configure the maximum power for the PI.

poe max-power max-power

By default, the maximum PI power is 15400 W.

Configuring the PoE priority policy

Configuring the PSE priority policy

About the PSE priority policy

The PSE priority policy performs priority-based power allocation in PoE power overload situations. The 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 the PSE priority policy.

When PoE power overload occurs, the system supplies power to PSEs as follows:

·     If you have not enabled the PSE priority policy, the PoE self-protection mechanism is triggered.

·     If you have enabled the PSE priority policy, the system supplies power to PSEs as follows:

¡     If a PSE being powered causes PoE power overload, the system stops supplying power to the PSE.

¡     If a new PSE causes PoE power overload, the system supplies power to PSEs in priority descending order. If the new PSE has the same priority as a PSE being powered, the PSE being powered takes precedence. If multiple PSEs being powered have the same priority, the one with the smallest PSE ID takes precedence.

Restrictions and guidelines

Before you configure a PSE with critical priority, make sure the remaining power from the maximum PoE power minus maximum powers of PSEs with critical priority is greater than the maximum power of the PSE. This restriction does not apply to PSEs with high and low priorities.

Configuration for PSEs whose power is preempted remains unchanged.

Procedure

1.     Enter system view.

system-view

2.     Enable the PSE priority policy.

poe pse-policy priority

By default, the PSE priority policy is disabled.

3.     (Optional.) Configure a priority for a PSE.

poe priority { critical | high | low } pse pse-id

By default, the priority for a PSE is low.

Configuring the PI priority policy

About the PI priority policy

The PI priority policy enables the PSE to perform priority-based power allocation to PIs when PSE power overload occurs. The priority levels for PIs are critical, high, and low in descending order.

When PSE power overload occurs, the PSE supplies power to PDs as follows:

·     If the PI priority policy is disabled, the PSE supplies power to PDs depending on whether you have configured the maximum PSE power.

¡     If you have configured the maximum PSE power, the PSE does not supply power to the newly-added or existing PD that causes PSE power overload.

¡     If you have not configured the maximum PSE power, the PoE self-protection mechanism is triggered. The PSE stops supplying power to all PDs.

·     If the PI priority policy is enabled, the PSE supplies power to PDs as follows:

¡     If a PD being powered causes PSE power overload, the PSE stops supplying power to the PD.

¡     If a newly-added PD causes PSE power overload, the PSE supplies power to PDs in priority descending order of the PIs to which they are connected.

¡     If the newly-added PD and a PD being powered have the same priority, the PD being powered takes precedence.

¡     If multiple PIs being powered have the same priority, the PIs with smaller IDs takes precedence.

Restrictions and guidelines

Before you configure a PI with critical priority, make sure the remaining power from the maximum PSE power minus the maximum powers of the existing PIs with critical priority is greater than maximum power of the PI.

Configuration for a PI whose power is preempted remains unchanged.

Procedure

1.     Enter system view.

system-view

2.     Enable the PI priority policy.

poe pd-policy priority

By default, the PI priority policy is disabled.

3.     Enter PI view.

interface interface-type interface-number

4.     (Optional.) Configure a priority for the PI.

poe priority { critical | high | low }

By default, the priority for a PI is low.

Configuring PoE monitoring

Configuring PSE power monitoring

About 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."

Procedure

1.     Enter system view.

system-view

2.     Configure a power alarm threshold for a PSE.

poe utilization-threshold value pse pse-id

By default, the power alarm threshold for a PSE is 80%.

Configuring a PI by using a PoE profile

Restrictions and guidelines

To modify a PoE profile applied on a PI, first remove the PoE profile from the PI.

You can configure a PI either on the PI or by using a PoE profile. The poe max-power max-power and poe priority { critical | high | low } commands must be configured using the same method.

Configuring a PoE profile

1.     Enter system view.

system-view

2.     Create a PoE profile and enter its view.

poe-profile profile-name [ index ]

By default, no PoE profiles exist.

3.     Enable PoE.

poe enable

By default, PoE is disabled.

4.     (Optional.) Configure the maximum PI power.

poe max-power max-power

By default, the maximum PI power is 15400 W.

5.     (Optional.) Configure a PI priority.

poe priority { critical | high | low }

The default priority is low.

This command takes effect only after the PI priority policy is enabled.

Applying a PoE profile

Restrictions and guidelines

You can apply a PoE profile to multiple PIs in system view or a single PI in PI view. If you perform the operation in both views for the same PI, the most recent operation takes effect.

You can apply only one PoE profile to a PI.

Applying a PoE profile in system view

1.     Enter system view.

system-view

2.     Apply a PoE profile to PIs.

apply poe-profile { index index | name profile-name } interface interface-range

By default, a PoE profile is not applied to a PI.

Applying a PoE profile in PI view

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 }

By default, a PoE profile is not applied to a PI.

Upgrading PSE firmware in service

About upgrading PSE firmware in service

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

·     Refresh mode—Updates the PSE firmware without deleting it. You can use the refresh mode in most cases.

·     Full mode—Deletes the current PSE firmware and reloads a new one. Use the full mode if the PSE firmware is damaged and you cannot execute any PoE commands.

Restrictions and guidelines

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.

Procedure

1.     Enter system view.

system-view

2.     Upgrade the PSE firmware in service.

poe update { full | refresh } filename [ pse pse-id ]

Display and maintenance commands for PoE

Execute display commands in any view.

 

Task

Command

Display general PSE information.

In standalone mode:

display poe device

In IRF mode:

display poe device [ 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 power information for the PoE power supply and all PSEs.

In standalone mode:

display poe power-usage

In IRF mode:

display poe power-usage [ slot slot-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 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 examples

Example: Configuring PoE

Network configuration

As shown in Figure 2, the device has two PSEs PSE 4 and PSE 7, in slot 1 and 2, respectively. 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 4. (This example assumes that the default maximum power of PSE 7 can meet the requirements.)

·     Allocate AP B a maximum power of 9000 milliwatts.

Figure 2 Network diagram

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 pse 10 max-power 400

# Enable PoE on GigabitEthernet 1/0/1 and GigabitEthernet 2/0/1.

[PSE] interface gigabitethernet 1/0/1

[PSE-GigabitEthernet1/0/1] poe enable

[PSE-GigabitEthernet1/0/1] quit

[PSE] interface gigabitethernet 2/0/1

[PSE-GigabitEthernet2/0/1] poe enable

[PSE-GigabitEthernet2/0/1] quit

# Enable PoE on GigabitEthernet 1/0/2, and set its power priority to critical.

[PSE] interface gigabitethernet 1/0/2

[PSE-GigabitEthernet1/0/2] poe enable

[PSE-GigabitEthernet1/0/2] poe priority critical

[PSE-GigabitEthernet1/0/2] quit

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

[PSE] interface gigabitethernet 2/0/2

[PSE-GigabitEthernet2/0/2] poe enable

[PSE-GigabitEthernet2/0/2] 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 issue:

1.     Identify whether the remaining guaranteed power of the PSE is lower than the maximum power of the PI. If it is, increase the maximum PSE power or reduce the maximum power of the PI.

2.     Identify whether the priority has been configured through other methods. If the priority has been configured, remove the configuration.

3.     If the issue 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 issue:

1.     Identify whether some settings in the PoE profile have been configured. If they have been configured, remove the configuration.

2.     Identify whether the settings in the PoE profile meet the requirements of the PI. If they do not, modify the settings in the PoE profile.

3.     Identify whether another PoE profile is already applied to the PI. If it is, remove the application.

4.     If the issue persists, contact H3C Support.

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