H3C S7500 Series Operation Manual(Release 3100 Series)-(V1.04)

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28-PoE Configuration
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Chapter 1  PoE Configuration

When configuring PoE, go to these sections for information you are interested in:

l           PoE Overview

l           PoE Configuration

l           Displaying PoE Configuration

l           PoE Configuration Example

1.1  PoE Overview

1.1.1  Introduction to PoE

Power over Ethernet (PoE) uses 10BaseT, 100Base-TX, and 1000Base-T twisted pairs to supply power to the remote powered devices (PD) in the network and implement power supply and data transmission simultaneously.

I. Advantages of PoE

l           Reliability: The centralized power supply provides backup convenience, unified management, and safety.

l           Easy connection: Network terminals only require an Ethernet cable, but no external power supply.

l           Standard: PoE conforms to the 802.3af standard and uses a globally uniform power interface;

l           Bright application prospect: PoE can be applied to IP phones, wireless access points (APs), chargers for portable devices, card readers, cameras, and data collection.

II. PoE components

l           Power sourcing equipment (PSE): PSE is comprised of the power and the PSE functional module. It can implement PD detection, PD power information collection, PoE, power supply monitoring, and power-off for devices.

l           PD: PDs receive power from the PSE. PDs include standard PDs and nonstandard PDs. Standard PDs conform to the 802.3af standard, including IP phones, WLAN APs, and network cameras.

l           Power interface (PI): PIs are RJ45 interfaces, which connect PSE/PDs with network cables.

1.1.2  PoE Features Supported by S7500

S7500 series Ethernet switches (hereinafter referred to as S7500 series) support PoE. Equipped with external power supply and PoE-enabled boards, S7500 series can provide –48 VDC power to remote PDs through twisted pairs.

l           The S7500 series support IEEE802.3af standard. They can also supply power to PDs noncompliant with the standard.

l           The power supply of the S7500 series is administered by the main control board; each PoE board on the switch can be viewed as a PSE and administers the power supply of all the ports on it independently.

l           The S7500 series can deliver data and current simultaneously through data wires (1, 3, 2, and 6) of category-3/5 twisted pairs.

l           The S7500 series supply power through the Ethernet electrical ports on the service boards. Each service board can supply power to up to 48 remote devices at the maximum distance of 100 m (328 feet).

l           Each Ethernet port can supply at most a power of 15.4 W to remote PDs.

l           When the S7500 series supply power to remote devices, the maximum total power that it can provide is 2,400 W. The switch determines whether to supply power to the next remote PD it discovers depending on the total power it currently supplies.

 

&  Note:

l      When the PoE-enabled S7500 series supply power to remote PDs, the PDs need not have any external power supply.

l      If a remote PD has an external power supply, the PoE-enabled S7500 series and the external power supply will be redundant with each other for the PD.

 

1.1.3  External PSE2500-A1 Power System

If PSE2500-A1 power system is taken as the external power supply, the power is distributed as follows:

1)         Input voltage: 100 VAC to 140 VAC

l           One power supply unit (PSU) of the PSE2500-A1 power system can supply 1,250 W of power, and two PSUs can supply up to 2,400 W of power.

l           If the PSUs of PSE2500-A1 power system need to work in redundancy mode, three PSUs are required and they work together to supply 2,400 W of power.

2)         Input voltage: 200 VAC to 240 VAC

l           One PSU of the PSE2500-A1 power system can supply 2,500 W of power.

l           If the PSUs of PSE2500-A1 power system need to work in redundancy mode, two PSUs are required.

1.1.4  PoE-enabled Boards

The following boards of S7500 series support PoE:

l           LS81FT48F

l           LS81GT48A

1.1.5  Setting PoE Management Mode

S7500 series manage PoE in either auto mode or manual mode. Through the setting of the management and PoE priority, the switch determines whether to supply power to newly added PDs when the power supply is almost fully loaded.

l           auto mode: When the switch is reaching its full load in supplying power, it will first supply power to the PDs that are connected to the ports with critical priority, and then supply power to the PDs that are connected to the ports with high priority. For example, port A is of critical priority. When the switch is reaching its full load and a new PD is added to port A, the switch will power down the PD connected to a port with lower priority and turn to supply power to this new PD.

l           manual mode: When the switch is reaching its full load in supplying power, it will neither consider the priority nor make change to its original power supply state. For example, port A has the priority critical. When the switch is reaching its full load and a new PD is added to port A, the switch will not supply power to this new PD.

 

&  Note:

In auto mode, when the switch is reaching its full load in supplying power, the switch decides whether to supply power to remote PDs on a port based on the port priority. Note that the switch can only compare the priority of ports on the same board.

 

1.2  PoE Configuration

1.2.1  PoE Configuration Task List

Complete the following tasks to configure PoE:

 

1.2.2  Configuring the PoE Feature of a Switch

Follow these steps to configure the PoE feature on a port:

To do…

Use the command…

Remarks

Enter system view

system-view

Configure the maximum PoE power that a switch can supply

poe power max-value max-value

Optional

By default, the maximum PoE power that a switch can supply is 2,400 W.

 

&  Note:

When setting the maximum PoE power supplied by the switch with the poe power max-value command, you must set it to a value greater than the total power that has been distributed to the boards. Otherwise, this command cannot be executed successfully. The maximum power that a switch can supply ranges from 37 W to 2,400 W.

 

1.2.3  Configuring the PoE Feature of a PoE-enabled Board

Follow these steps to configure the PoE feature of a PoE-enabled board:

To do…

Use the command…

Remarks

Enter system view

system-view

Set the PoE management mode of the switch

poe power-management { auto | manual } slot slot-number

Optional

By default, the switch manages PoE in the manual mode.

Enable the PoE feature of the board

poe enable slot slot-number

Optional

By default, the PoE feature is disabled on a board.

Set the maximum power that the board can supply

poe max-power max-power slot slot-number

Optional

By default, a board provides up to 37W of power.

Enable the compatibility detection feature for remote PDs of the board

poe legacy enable slot slot-number

Optional

By default, compatibility detection is disabled for PDs.

 

&  Note:

l      You can successfully enable PoE on a board only when the remaining power of the switch is not less than the full power of this board.

l      The required power of PDs may exceed the power configured for them due to their unstable status. As a result, the PDs connected to the last port on the board may be powered off. Therefore, when you configure the maximum power value for a board, ensure enough power for all ports of the board and reserve additional 20 W power for instant high power at the same time.

l      Once PoE is enabled on a board, the system reserves the power for the slot even after you remove the board from the slot; in this case, you can use the undo poe enable slot command to release this power.

l      The reserved power for a blank slot will be recycled automatically if you insert a PoE-incapable board into the slot. The reserved power for a blank slot is distributed to the slot if you insert a different type of PoE-capable board into the slot.

l      Before you enable the PoE-compatibility detection on a board, you must first enable PoE on this board with the poe enable slot slot-num command.

l      When PoE-compatibility detection is performed on non-standard devices, the system performance will be affected. When standard 802.3af devices are connected to the board, you are not recommended to enable the PoE-compatibility detection feature.

 

1.2.4  Setting the PoE Feature of a PoE Port

Follow these steps to set the PoE management mode and PoE priority of a port:

To do…

Use the command…

Remarks

Enter system view

system-view

Enter Ethernet port view

interface interface-type interface-number

Enable the PoE feature

poe enable

Required

By default, the PoE feature is enabled on a port when the PoE feature is enabled on a board.

Set the maximum power supplied by the port

poe max-power max-power

Optional

By default, the maximum power supplied by the port is 15.4 W.

Set the power supply mode of the port

 poe mode { signal | spare }

Optional

The S7500 series only support the signal mode.

Set the PoE priority of the port

poe priority { critical | high | low }

Optional

By default, the PoE priority of the port is low

 

&  Note:

l      The S7500 series do not support the spare mode.

l      When a board is almost fully loaded and a new PD is added, the switch will respond to the PD according to the PoE management mode. For details, see Setting PoE Management Mode.

l      In auto mode, when the switch is reaching its full load in supplying power, the switch decides whether to supply power to remote PDs on a port based on the port priority. Note that the switch can only compare the priority of ports on the same board.

 

1.2.5  Upgrading the PSE Processing Software Online

The online upgrading of PSE processing software can update the processing software or repair the damaged software. After downloading the PSE processing software to the Flash of the switch, you can perform the following configuration. Refer to “File System Management” for how to download the PSE processing software.

Follow these steps to upgrade PSE processing software online:

To do…

Use the command…

Remarks

Enter system view

system-view

Upgrade the PSE processing software online

poe upgrade { refresh | full } filename

Required

 

&  Note:

l      The refresh update mode is to upgrade the valid software in the PSE through refreshing the software, while the full update mode is to delete the invalid software in PSE completely and then reload the software.

l      Generally, the refresh update mode is used to upgrade the PSE processing software.

l      When the PSE processing software is damaged (that is, no PoE commands can be successfully executed), you can use the full update mode to upgrade and restore the software.

l      When the upgrading procedure in refresh update mode is interrupted for some unexpected reason (such as power-off) or some errors occur, if the upgrade in full mode fails after restart, you must upgrade in full mode after power-off and restart of the device. In this way, the upgrade procedure succeeds.

 

1.3  Displaying PoE Configuration

To do…

Use the command…

Remarks

Display the PoE status of a specific port or all ports of the switch

display poe interface { interface-type interface-number | all }

Available in any view

Display the PoE power information of a specific port or all ports of the switch

display poe interface power { interface-type interface-number | all }

Display the PSE parameters

display poe powersupply

Display the power supply status of each board and the power that the board supplies

display poe pse

 

1.4  PoE Configuration Example

I. Networking requirements

l           Two PoE-enabled boards are installed in slot 3 and 5 on an S7506 switch.

l           Upgrade the PSE processing software of the PoE board in slot 5 of the S7506 switch online.

l           Ethernet 3/0/1 to Ethernet 3/0/48 are connected with IP phones and Ethernet 5/0/1 to Ethernet 5/0/48 are connected with access point (AP) devices.

l           PoE does not need to be enabled on the IP phones connected to Ethernet 3/0/1 and Ethernet 3/0/48.

l           Ethernet 3/0/48 requires high priority.

l           Set the PoE management mode of slot 3 to auto.

l           Slot 3 is supplied with 400 W of power and slot 5 is supplied with full power (namely, 806 W).

l           Enable PoE-compatibility detection on the PoE board in slot 3.

l           The input power of the AP device connected with port Ethernet 5/0/15 cannot be greater than 9 W.

II. Networking diagram

Figure 1-1 Network diagram for PoE

III. Configuration procedure

# Enter system view.

<H3C>system-view

# Upgrade the PSE processing software of the PoE board in slot 5 of the S7506 switch online.

[H3C] poe upgrade refresh 0400_001.S19

# Enable the PoE feature on the boards in slot 3 and slot 5.

[H3C] poe enable slot 3

[H3C] poe enable slot 5

# Set the PoE management mode on slot 3 to auto.

[H3C] poe power-management auto slot 3

# Set the maximum power supplied by the board in slot 3 to 400 W.

[H3C] poe max-power 400 slot 3

# Set the maximum power supplied by the board in slot 5 is 806 W (full power).

[H3C] poe max-power 806 slot 5

# Disable the PoE feature on Ethernet 3/0/23 and Ethernet 3/0/24.

[H3C]interface Ethernet 3/0/23

[H3C-Ethernet3/0/23] undo poe enable

[H3C-Ethernet3/0/23] quit

[H3C]interface Ethernet 3/0/24

[H3C-Ethernet3/0/24] undo poe enable

[H3C-Ethernet3/0/24] quit

# Set the priority of Ethernet 3/0/48 to critical, so that the devices connected to Ethernet 3/0/48 can be provided with power preferentially without interrupting power supply to the current ports.

[H3C]interface Ethernet 3/0/48

[H3C-Ethernet3/0/48] poe priority critical

# Enable the PoE-compatibility detection feature on the board in slot 3.

[H3C] poe legacy enable slot 3

# Set the maximum PoE power supplied by Ethernet 5/0/15 to 9 W.

[H3C] interface Ethernet5/0/15

[H3C-Ethernet5/0/15] poe max-power 9000

 


Chapter 2  PoE PSU Supervision Configuration

When configuring PoE PSU supervision, go to these sections for information you are interested in:

l           Introduction to PoE PSU Supervision

l           AC Input Alarm Thresholds Configuration

l           DC Output Alarm Threshold Configuration

l           Displaying PoE Supervision Information

l           PoE PSU Supervision Configuration Example

2.1  Introduction to PoE PSU Supervision

The PoE-enabled S7500 series can monitor the external PoE power supply units (PSUs) through SRPUs.

Complete these tasks to configure PoE PSU supervision:

 

&  Note:

The PSE performance will be affected by fast switching of PoE PSUs. The interval of switching PoE PSUs must be greater than five seconds.

 

2.2  AC Input Alarm Thresholds Configuration

You can set the AC input alarm thresholds for the PoE PSUs to enable the S7500 series to monitor the AC input voltages of the PSUs in real time through SRPUs.

2.2.1  Configuring AC Input Alarm Threshold

Follow these steps to configure AC input alarm thresholds:

To do…

Use the command…

Remarks

Enter the system view

system-view

Set the overvoltage alarm threshold of AC input (upper threshold) for the PoE PSUs

poe-power input-thresh upper string

Required.

 For 220 VAC input, the threshold is recommended to be 264.0 V.

For 110 VAC input, the threshold is recommended to be 132.0 V.

Set the undervoltage alarm threshold of AC input (lower threshold) for the PoE PSUs

poe-power input-thresh lower string

Required

For 220 VAC input, the threshold is recommended to be 181.0 V.

For 110 VAC input, the threshold is recommended to be 90.0 V.

 

&  Note:

l      You can set the thresholds to any appropriate values in the range, but make sure the lower threshold is less than the upper threshold.

l      For 220 VAC input, it is recommended to set the upper threshold to 264.0 V and the lower threshold to 181.0 V.

l      For 110 VAC input, you are recommended to set the upper threshold to 132.0 V and the lower threshold to 90.0 V.

 

2.2.2  AC Input Alarm Threshold Configuration Example

I. Network requirements

l           Set the overvoltage alarm threshold of AC input for PoE PSUs to 264.0 V.

l           Set the undervoltage alarm threshold of AC input for PoE PSUs to 181.0 V.

II. Configuration procedure

# Enter system view.

<H3C> system-view

# Set the overvoltage alarm threshold of AC input for PoE PSUs to 264.0 V.

[H3C] poe-power input-thresh upper 264.0

# Set the undervoltage alarm threshold of AC input for PoE PSUs to 181.0 V.

[H3C] poe-power input-thresh lower 181.0

# Display the AC input state of the PoE PSUs.

[H3C] display poe-power ac-input state

2.3  DC Output Alarm Threshold Configuration

You can set the DC output alarm thresholds for the PoE PSUs to enable the S7500 series to monitor the DC output voltages of the PSUs in real time through SRPUs.

2.3.1  DC Output Alarm Thresholds Configuration Tasks

Follow these steps to set DC output alarm thresholds:

To do…

Use the command…

Remarks

Enter the system view

system-view

Set the overvoltage alarm threshold of DC output (upper threshold) for the PoE PSUs

poe-power output-thresh upper string

Required

You are recommended to set the upper threshold to 47 V when 220 VAC or 110 VAC is input.

Set the undervoltage alarm threshold of DC output (lower threshold) for the PoE PSUs

poe-power output-thresh lower string

Required

You are recommended to set the lower threshold to 55 V when 220 VAC or 110 VAC is input.

 

2.3.2  DC Output Alarm Threshold Configuration Example

I. Network requirements

l           Set the overvoltage alarm threshold of DC output for the PoE PSUs to 55.0 V.

l           Set the undervoltage alarm threshold of DC output for the PoE PSUs to 47.0 V.

II. Configuration procedure

# Enter system view.

<H3C> system-view

# Set the overvoltage alarm threshold of DC output for the PoE PSUs to 55.0 V.

[H3C] poe-power output-thresh upper 55.0

# Set the undervoltage alarm threshold of DC output for the PoE PSUs to 47.0 V.

[H3C] poe-power output-thresh lower 47.0

# Display the DC output state of the PoE PSUs.

[H3C] display poe-power dc-output state

# Display the DC output voltage/current values of the PoE PSUs.

[H3C] display poe-power dc-output value

2.4  Displaying PoE Supervision Information

To do…

Use the command…

Remarks

Display the basic information about the external PoE PSUs.

display supervision-module information

Available in any view

Display alarm information about the PoE PSUs.

display poe-power alarm

Display the number and state of the AC power distribution switches in the external PoE PSUs.

display poe-power switch state

Display the AC input state of the external PoE PSUs

display poe-power ac-input state

Display the DC output of the external PoE PSUs

display poe-power dc-output state

Display the DC output voltage/current values of the external PoE PSUs

display poe-power dc-output value

 

For details about output information, refer to the Command Manual.

2.5  PoE PSU Supervision Configuration Example

I. Network requirements

l           Insert a PoE-enabled board into slot 3 of the S7500 series.

l           Connect IP phones to Ethernet 3/0/1 through Ethernet 3/0/48.

l           Set the AC input and DC output alarm thresholds to appropriate values.

II. Network diagram

Figure 2-1 Network diagram for PoE supervision configuration

III. Configuration procedure

# Enter the system view.

<H3C> system-view

# Enable PoE on the board in slot 3.

[H3C] poe enable slot 3

# Set the overvoltage alarm threshold of AC input for the PoE PSUs to 264.0 V.

[H3C] poe-power input-thresh upper 264.0

# Set the undervoltage alarm threshold of AC input for the PoE PSUs to 181.0 V.

[H3C] poe-power input-thresh lower 181.0

# Set the overvoltage alarm threshold of DC output for the PoE PSUs to 55.0 V.

[H3C] poe-power output-thresh upper 55.0

# Set the undervoltage alarm threshold of DC output for the PoE PSUs to 47.0 V.

[H3C] poe-power output-thresh lower 47.0

 

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