Do you know how to configure PoE of Huawei switches? In this post, let’s discuss.
- POE power supply standard
In a PoE system, the device that provides power is called the power supply equipment (PSE), and the device that uses the power is called the powered device (PD). The PoE switch is PSE, and other IP phones, WLAN APs, IP cameras, etc. are all PDs. PoE technology is widely used in home applications, wireless network construction, security protection, retail, entertainment and other scenarios because of its easy installation, easy management, and safety and stability.
802.3af: The current PoE based on the 802.3af standard can provide a maximum power of 15.4W.
802.3at: PoE+ based on the 802.3at standard can provide a maximum power of 30W.
However, with the emergence of business types and new-style terminals, there are wider requirements for input power, and higher power needs to be provided. At present, many PoE++ switches have been launched based on the draft 802.3bt standard, and PoE++ can provide 60W power output.
The specific performance parameters are compared as shown in the following table:
PoE vs PoE+ vs PoE++
| Type | PoE | PoE+ | PoE++ |
| Standard | 802.3af | 802.3at | 802.3bt |
| Power Distance | 100m | 100m | 100m |
| Classification | 0~3 | 0~4 | 0~8 |
| Max Electric Current | 350mA | 720mA | 720mA |
| PSE Output Voltage | 44~57V DC | 50~57V DC | 50~57V DC |
| PSE Output Power | ≤15.4W | ≤30W | ≤60W |
| PD Input voltage | 36~57V DC | 42.5~57V DC | 42.5~57V DC |
| PD Maximum power | 12.95W | 25.5W | 54W |
| Cable | Unstructured | CAT-5 or better | CAT-5 or better |
| Number of power supply cable pairs | 2 | 2 | 4 |
When we choose the PoE setting, we need to use it according to the above standards and maximum functions.
- The configuration of the POE switch
Huawei’s PoE switches are mainly in S5735, S5731, S1730 and other models. It may be used in the project. Let’s study the configuration of Huawei POE switches.
In the network environment, the switch acts as a network access layer device. The IP phone connected to the device is placed outdoors, and the AP is located on the outer wall of the office. The location is remote and it is not convenient to connect to the power supply. Users want to directly supply power through the switch device to save equipment deployment costs.
In order to achieve flexible management of connected PD devices, the power supply management mode of the device is an automatic mode. AP1 is the office network of a bank. The equipment cannot be powered off and requires the highest priority for power supply. At the same time, the business volume of IP Phone1 is relatively large, and it is hoped to obtain a higher power supply guarantee, and cannot be powered down unless special circumstances. AP2 needs to be powered off at a fixed time period each day.
(1) Configure the power supply management mode of the device to automatic mode.
<HUAWEI> system-view
[HUAWEI] sysname Switch
[Switch] poe power-management auto
(2) Configure the maximum external output power of GigabitEthernet0/0/1, GigabitEthernet0/0/3, and GigabitEthernet0/0/2 to 15W, 15W, and 20W respectively. The power settings on the device are all in milliwatts (mW).
[Switch] interface gigabitethernet 0/0/1
[Switch-GigabitEthernet0/0/1] poe power 15000
[Switch-GigabitEthernet0/0/1] quit
[Switch] interface gigabitethernet 0/0/3
[Switch-GigabitEthernet0/0/3] poe power 15000
[Switch-GigabitEthernet0/0/3] quit
[Switch] interface gigabitethernet 0/0/2
[Switch-GigabitEthernet0/0/2] poe power 20000
[Switch-GigabitEthernet0/0/2] quit
(3) Configure the power supply priority of the GigabitEthernet0/0/2 interface as critical.
[Switch] interface gigabitethernet 0/0/2
[Switch-GigabitEthernet0/0/2] poe priority critical
[Switch-GigabitEthernet0/0/2] quit
(4) Configure the power supply priority of the GigabitEthernet0/0/1 interface as High.
[Switch] interface gigabitethernet 0/0/1
[Switch-GigabitEthernet0/0/1] poe priority high
[Switch-GigabitEthernet0/0/1] quit
(5) Configure the devices under the GigabitEthernet0/0/4 interface to power off from 10:00 to 11:00 every day.
[Switch] time-range tset 10:00 to 11:00 daily
[Switch] interface gigabitethernet 0/0/4
[Switch-GigabitEthernet0/0/4] poe power-off time-range tset
Warning: This operation will power off the PD during this time range poe. Continue?[Y/N]:y
[Switch-GigabitEthernet0/0/4] quit
(6) Verify the content of the configuration result.
#
sysname Switch
#
Time-range tset 10:00 to 11:00 daily
#
Interface GigabitEthernet0/0/1
poe priority high
poe power 15000
#
Interface GigabitEthernet0/0/2
poe priority critical
poe power 20000
#
Interface GigabitEthernet0/0/3
poe power 15000
#
Interface GigabitEthernet0/0/4
poe power-off time-range tset
#
return
There are three main standards for POE: IEEE802.3af, IEEE802.3at, and 802.3bt. The biggest difference between the three is that the power of the single-port power supply is different. The standard output of AF is 15.4W, and the standard output of at is 30W; BT is the standard output power of 60W. After the use of a POE switch, a network cable can achieve data transmission and can also achieve Power supply, saving materials and construction time in project implementation;
Of course, if you don’t use the PoE function of the PoE switch, you can also choose to turn it off. You can choose to turn off the PoE function. Some brands are ok, and some brands cannot be turned off directly.
There are two main ways to close the POE function of the switch. The first method is to log in through the web page to directly close it, and the second method to log in to the switch interface through the command line to close the POE function.
[HUAWEI]system-view
[switch] interface GigbitEthernet 1/1; // Enter switch 1/1 interface
[switch -Gigbit Ethernet 1/1] undo poe enable；// Turn off the POE
If you have different opinions, please leave your comment.
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