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| Title | Size | Download |
|---|---|---|
| 04-PoE configuration | 124.97 KB |
Restrictions: Hardware compatibility with PoE
PoE configuration tasks at a glance
Prerequisites for configuring PoE
Configuring the maximum PI power
Configuring the PoE priority policy
Configuring the PI priority policy
Configuring PSE power monitoring
Upgrading PSE firmware in service
Display and maintenance commands for PoE
Failure to set the priority of a PI to critical
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.
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
|
Hardware series |
Model |
Product code |
PoE compatibility |
|
WX2500X series |
· WX2560X · WX2580X |
· EWP-WX2560X · EWP-WX2580X |
No: · EWP-WX2560X · EWP-WX2580X |
|
WX2500X-E series |
WX2508X-E |
EWP-WX2508X-E |
No: EWP-WX2508X-E |
|
Hardware series |
Model |
Product code |
PoE compatibility |
|
WX2500X-LI series |
· WX2510X-LI · WX2510X-PWR-LI · WX2520X-LI · WX2540X-LI · WX2550X-LI · WX2560X-LI · WX2580X-LI |
· EWP-WX2510X-LI · EWP-WX2510X-PWR-LI · EWP-WX2520X-LI · EWP-WX2540X-LI · EWP-WX2550X-LI · EWP-WX2560X-LI · EWP-WX2580X-LI |
Yes:EWP-WX2510X-PWR-LI No: · EWP-WX2510X-LI · EWP-WX2520X-LI · EWP-WX2540X-LI · EWP-WX2550X-LI · EWP-WX2560X-LI · EWP-WX2580X-LI |
|
Hardware series |
Model |
Product code |
PoE compatibility |
|
WX2800X series |
· WX2812X-PWR · WX2860X · WX2880X |
· EWP-WX2812X-PWR · EWP-WX2860X · EWP-WX2880X |
· Yes: EWP-WX2812X-PWR · No: · EWP-WX2860X · EWP-WX2880X |
|
WSG1800X series |
· WSG1808X-PWR · WSG1808X-PWR · WSG1812X-PWR · WSG1840X |
· EWP-WSG1808X-PWR · EWP-WSG1808X-PWR-JP · EWP-WSG1812X-PWR · EWP-WSG1840X |
Yes: EWP-WSG1808X-PWR, EWP-WSG1808X-PWR-JP, EWP-WX2812X-PWR No: EWP-WSG1840X |
PoE configuration tasks at a glance
To configure PoE, perform the following tasks:
1. Enabling PoE
2. (Optional.) Configuring the PoE power
¡ Configuring the maximum PI power
3. (Optional.) Configuring the PoE priority policy
¡ Configuring the PI priority policy
4. (Optional.) Configuring PoE monitoring
¡ Configuring PSE power monitoring
5. (Optional.) Upgrading PSE firmware in service
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 PI
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 the PoE power
Configuring the maximum PI power
About this task
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 power for a PI is 30000 milliseconds.
Configuring the PoE priority policy
Configuring the PI priority policy
About this task
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
Configuring PoE monitoring
Configuring PSE power monitoring
About this task
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
By default, the power alarm threshold for a PSE is 80%.
Upgrading PSE firmware in service
About this task
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
Display and maintenance commands for PoE
Execute display commands in any view.
|
Task |
Command |
|
Display general PSE information. |
display poe device |
|
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 detailed PSE information. |
display poe pse |
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.
