Power over Ethernet (PoE) uses 10Base-T,
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 interfaces;
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
Powered device (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, network cameras and so on.
l
Power interface (PI): PIs are RJ45 interfaces
which connect PSE/PDs to network cables.
PoE-enabled S5600 series Ethernet switches
include:
l
S5600-26C-PWR
l
S5600-50C-PWR
A PoE-enabled S5600 switch has the
following features:
l
As the PSE, it supports the IEEE802.3af standard.
It can also supply power to some PDs that do not support the 802.3af standard.
l
It can deliver data and current simultaneously through
data wires (1, 3, 2, and 6) of category-3/5 twisted pairs.
l
Through the fixed 24/48 Ethernet electrical
ports, it can supply power to up to 24/48 remote Ethernet switches with a maximum
distance of 100 m (328 feet).
l
Each Ethernet port can supply at most a power of
15,400 mW to a PD.
l
When AC power input is adopted for the switch, the
maximum total power that can be provided is 300 W. It can determine whether to supply
power to the next remote PD it detects depending on its available power.
l
When DC power input is adopted for the switch: it
is capable of supplying full power to all of the 24/48 ports, that is, 15,400 mW
for each port, and the total power is 369.6/739.2 W.
l
The PSE processing software on the switch can be
upgraded online.
l
The switch provides statistics about power
supplying on each port and the whole equipment, which you can query through the
display command.
l
The switch provides two modes (auto and manual)
to manage the power feeding to ports in the case of PSE power overload.
l
The switch provides over-temperature protection
mechanism. Using this mechanism, the switch disables the PoE feature on all ports
when its internal temperature exceeds 65 0C (149 0F) for
self-protection, and restores the PoE feature on all its ports when the
temperature drops below 60 0C (140 0F).
l
The switch supports the PoE profile feature,
that is, different PoE policies can be set for
different user groups. These PoE policies are each saved in the corresponding
PoE profile and applied to ports of the user groups.
l
When using the PoE-enabled S5600 switch to
supply power, the PDs need not have any external power supply.
l
If a remote PD has an external power supply, the
PoE-enabled S5600 switch and the external power supply will be redundant with
each other for the PD.
l
Only the electrical ports of the PoE-enabled S5600
switch support the PoE feature.
Table 1-1 PoE configuration tasks
Table 1-2 Enable the PoE feature on a port
|
Operation
|
Command
|
Description
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Enable the PoE feature on the port
|
poe enable
|
Required
By default, the PoE function on a port is
enabled by the default configuration file when the device is delivered
|
Caution:
By default, the PoE
function on a port is enabled by the default configuration file when the device
is delivered.
If you delete the
default configuration file without specifying another one, the PoE function on
a port will be disabled after you restart the device..
The maximum power that can be supplied by a
PoE-enabled S5600 switch to its PD is 15,400 mW. In practice, you can set the
maximum power on a port depending on the actual power of the PD, in the range of
1,000 to 15,400 mW and in the granularity of 100 mW.
Table 1-3 Set the maximum output power on a port
|
Operation
|
Command
|
Description
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Set the maximum output power on the port
|
poe max-power max-power
|
Required
By default, the maximum output power on a
port is 15,400 mW
|
The power supply management mode and the
port priority settings will work together to control the power feeding of the
switch when the switch PoE is close to its full power load.
When AC power input is adopted for the
switch, the maximum total power that can be supplied by the PoE-enabled S5600
switch is 300 W. By default, when the switch PoE reaches its full load in supplying
power, it will manage the power supply to its ports in auto mode.
l
auto mode: When
the switch is close to 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 has the priority of critical. When the switch PoE
is close to its full load and a new PD is now added to port A, the switch will
power down the PD connected to the port with the lowest priority and turn to
supply power to this new PD. IF more than one port has the same lowest
priority, the switch will power down the PD connected to the port with larger
logical port number.
l
manual mode: When
the switch is close to its full load in supplying power, it will not make
change to its original power supply status based on its priority when a new PD
is added. For example: Port A has the priority critical. When the switch PoE is
close to its full load and a new PD is now added to port A, the switch just
gives a prompt that a new PD is added and will not supply power to this new PD.
After the PoE feature is enabled on the
port, perform the following configuration to set the PoE management mode and PoE
priority of a port.
Table 1-4 Set the PoE management mode and PoE
priority of a port
|
Operation
|
Command
|
Description
|
|
Enter system view
|
system-view
|
—
|
|
Set the PoE management mode for the
switch
|
poe power-management { auto | manual }
|
Required
By default, the PoE management mode is auto
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Se the PoE priority of a port
|
poe priority { critical | high | low }
|
Required
By default, the PoE priority of a port is
low
|
After the PoE feature is enabled on the port,
perform the following configuration to set the PoE mode on a port.
Table 1-5 Set the PoE mode on a port
|
Operation
|
Command
|
Description
|
|
Enter system view
|
system-view
|
—
|
|
Enter Ethernet port view
|
interface interface-type interface-number
|
—
|
|
Set the PoE mode on the port
|
poe mode {
signal | spare }
|
Required
S5600 series Ethernet switches do not
support PoE in the spare mode currently
|
After the PD compatibility detection
feature is enabled, the switch can supply power to the detected PDs that do not
conform to the 802.3af standard.
After the PoE feature is enabled, perform
the following configuration to enable the PD compatibility detection feature.
Table 1-6 Configure the PD compatibility
detection feature
|
Operation
|
Command
|
Description
|
|
Enter
system view
|
system-view
|
—
|
|
Enable the
PD compatibility detection function
|
poe
legacy enable
|
Required
By
default, the PD compatibility detection feature is disabled
|
1.8 Configuring PoE Over-Temperature
Protection on the Switch
If this function is enabled, the switch
disables the PoE feature on all ports when its internal temperature exceeds 65 0C
(149 0F) for self-protection, and restores the PoE feature settings
on all its ports when the temperature drops below 60 0C (140 0F).
Table 1-7 Configure
PoE over-temperature protection on the switch
|
Operation
|
Command
|
Description
|
|
Enter system view
|
system-view
|
—
|
|
Enable the PoE over-temperature
protection feature on the switch
|
poe temperature-protection enable
|
Required
By default, the PoE over-temperature protection
feature is enabled on the switch
|
l
When the internal temperature of the switch
decreases to 650C (1490F) below, but 600C (1400F) above, the switch still disables the PoE feature on all the ports.
l
When the internal temperature of the switch
increases to 60 0C (140 0F) above, but 650C
(1490F) below, the switch still enables the PoE
feature on all the ports.
1.9 Upgrading
the PSE Processing Software Online
The online upgrading of PSE processing
software can update the processing software or repair the software if it is
damaged. 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.
Table 1-8 Upgrade PSE processing software online
|
Operation
|
Command
|
Description
|
|
Enter system view
|
system-view
|
—
|
|
Upgrade the PSE processing software
online
|
poe update { refresh | full } filename
|
Required
|
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, all the PoE commands cannot be successfully executed), you can use
the full update mode to upgrade and restore the software.
l
When the online upgrading procedure is
interrupted for some unexpected reason (for example, the device restarts due to
some errors), if the upgrade in full mode fails after restart, you must
upgrade in full mode after power-off and restart of the device, and then
restart the device manually. In this way, the former PoE configuration is
restored.
After the above configuration, execute the display
command in any view to see the operation of the PoE feature and verify the
effect of the configuration.
Table 1-9
Display PoE information
|
Operation
|
Command
|
Description
|
|
Display
the PoE status of a specific port or all ports of the switch
|
display
poe interface [ interface-type interface-number
]
|
You can
execute the display command 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 ]
|
|
Display
the PSE parameters
|
display
poe powersupply
|
|
Display
the enabled/disabled status of the PoE over-temperature protection feature on
the switch
|
display
poe temperature-protection
|
1.11 PoE Configuration
Example
I. Networking requirements
l
The GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2
ports of the S5600-26C-PWR switch are connected to an S2016C switch and an AP
respectively; the GigabitEthernet 1/0/24 port is intended to be connected with
an important AP.
l
The PSE processing software of the S5600-26C-PWR
switch is first upgraded online. The remotely accessed PDs are powered by the S5600-26C-PWR
switch.
l
The power consumption of the accessed AP is 2,500
mW, and the power consumption of the S2016C switch is 12,000 mW.
l
It is required to guarantee the power feeding to
the PDs connected to the GigabitEthernet1/0/24 port even when the S5600-26C-PWR
switch is under full load.
II. Networking diagram
Figure 1-1 Network diagram for PoE
III. Configuration procedure
# Upgrade the PSE processing software
online.
<H3C> system-view
[H3C] poe update refresh 0290_021.s19
# Enable the PoE feature on GigabitEthernet
1/0/1, GigabitEthernet 1/0/2, and GigabitEthernet 1/0/24.
[H3C] interface GigabitEthernet 1/0/1
[H3C-GigabitEthernet1/0/1] poe enable
[H3C-GigabitEthernet1/0/1] quit
[H3C]interface GigabitEthernet 1/0/2
[H3C-GigabitEthernet1/0/2] poe enable
[H3C-GigabitEthernet1/0/2] quit
[H3C] interface GigabitEthernet 1/0/24
[H3C-GigabitEthernet1/0/24] poe
enable
[H3C-GigabitEthernet1/0/24] quit
# Set the maximum output power of GigabitEthernet
1/0/1 and GigabitEthernet 1/0/2 to 12,000 mW and 2,500 mW respectively.
[H3C] interface GigabitEthernet 1/0/1
[H3C-GigabitEthernet1/0/1] poe
max-power 12000
[H3C-GigabitEthernet1/0/1] interface GigabitEthernet
1/0/2
[H3C-GigabitEthernet1/0/2] poe
max-power 2500
[H3C-GigabitEthernet1/0/2] quit
# Set the PoE priority of GigabitEthernet 1/0/24
to critical to guarantee the power feeding to the AP to which this port
connects.
[H3C] interface GigabitEthernet
1/0/24
[H3C-GigabitEthernet1/0/24] poe
priority critical
[H3C-GigabitEthernet1/0/24] quit
# Set the power supply management mode on
the switch to auto (it is the default mode, so this step can be ignored).
[H3C] poe power-management auto
# Enable the PD compatibility detect of the
switch to allow the switch to supply power to part of the devices noncompliant
with the 802.3af standard.
[H3C] poe legacy enable
On a large-sized
network or a network with mobile users, to help network administrators to
monitor the PoE features of the switch, S5600 series Ethernet switches provide
the PoE profile features.
Features of PoE profile:
l
Various PoE profiles can be created. PoE policy
configurations applicable to different user groups are stored in the
corresponding PoE profiles. These PoE profiles can be applied to the ports used
by the corresponding user groups.
l
When users connect a PD to a PoE-profile-enabled
port, the PoE configurations in the PoE profile will be enabled on the port.
Table 2-1 Configure
PoE profile
|
Operation
|
Command
|
Description
|
|
Enter system view
|
system-view
|
—
|
|
Create a PoE profile
|
poe-profile profile-name
|
Required
Enter PoE profile view while creating the
PoE profile
|
|
Configure
the relevant features in PoE profile
|
Enable the
PoE feature on a port
|
poe
enable
|
Required
The PoE feature
on a port is disabled by default
|
|
Configure
PoE mode for Ethernet ports
|
poe
mode { signal | spare }
|
Optional
By
default, PoE mode is set to be signal
|
|
Configure
the PoE priority for Ethernet ports
|
poe
priority { critical | high | low
}
|
Optional
By
default, PoE priority is set to low
|
|
Configure the maximum power for Ethernet
ports
|
poe max-power max-power
|
Optional
By default, maximum power is set to be
15,400 mW
|
|
Quit system view
|
quit
|
—
|
|
Apply the existing PoE profile to the
specified Ethernet port
|
In system view
|
apply poe-profile profile-name interface interface-type interface-number
[ to interface-type interface-number ]
|
Required
Users can decide whether to configure the
settings in system view or port view
|
|
In Ethernet port view
|
Enter Ethernet port view
|
interface interface-type
interface-number
|
|
Apply the existing PoE profile to the
port
|
apply poe-profile profile-name
|
A PoE profile is a group of PoE configurations. Multiple PoE
features can be set in a PoE profile. When the apply poe-profile command
is used to apply a PoE profile to a port, some PoE features can be applied
successfully while some PoE configurations in it cannot. PoE profiles are
applied to S5600 series Ethernet switches according to the following rules:
l
When the apply poe-profile command is
used to apply a PoE profile to a port, the PoE profile is applied successfully
only if one PoE feature in the PoE profile is applied properly. When the display
current-configuration command is used for query, it is displayed that the
PoE profile is applied properly to the port.
l
If one or more features in the PoE profile are
not applied properly on a port, the switch will prompt explicitly which PoE features
in the PoE profile are not applied properly on which ports.
l
The display current-configuration command
can be used to query which PoE profiles are applied to a port. However, the
command cannot be used to query which PoE features in a PoE profiles are
applied successfully.
Caution:
l
PoE profile configuration is a global
configuration, and applies synchronously in the intelligent resilient framework
(IRF) system.
l
Combination of Unit creates a new Fabric. In the
newly created Fabric, the PoE profile configuration of the Unit with the
smallest Unit ID number will become the PoE profile configuration for the
Fabric currently in use.
l
Split of Fabric results in many new Fabrics. In
each newly created Fabric, the PoE profile configuration of each Unit remains
the same as it was before the split.
2.3 Displaying PoE Profile Configuration
After the above configuration, execute the display
command in any view to see the running status of the PoE profile and verify the
effect of the configuration by checking the displayed information.
Table 2-2 Display the PoE profile
configuration
|
Operation
|
Command
|
Description
|
|
Display the detailed information about
the PoE profiles created on the switch
|
display poe-profile { all-profile | interface interface-type
interface-number | name profile-name }
|
You can execute the display
command in any view
|
I. Network requirements
GigabitEthernet1/0/1 through GigabitEthernet1/0/10
of the S5600-50C-PWR switch are used by users of group A, who have the following
requirements:
l
The PoE function can be enabled on all ports in
use.
l
Signal cables are used to supply power.
l
The PoE priority for GigabitEthernet1/0/1
through GigabitEthernet1/0/5 is Critical, whereas the PoE priority for GigabitEthernet1/0/6
through GigabitEthernet1/0/10 is High.
l
The maximum power for GigabitEthernet1/0/1
through GigabitEthernet1/0/5 ports is 3,000 mW, whereas the maximum power for GigabitEthernet1/0/6
through GigabitEthernet1/0/10 is 15,400 mW.
Based on the above requirements, two PoE
profiles are made for users of group A.
l
Apply PoE profile 1 for GigabitEthernet1/0/1
through GigabitEthernet 1/0/5;
l
Apply PoE profile 2 for GigabitEthernet1/0/6
through GigabitEthernet 1/0/10.
Figure 2-1 PoE profile application
II. Configuration procedure
# Create Profile1, and enter PoE profile
view.
<H3C> system-view
[H3C] poe-profile Profile1
# In Profile1, add the PoE policy
configuration applicable to GigabitEthernet1/0/1 through GigabitEthernet1/0/5
ports for users of group A.
[H3C-poe-profile-Profile1] poe enable
[H3C-poe-profile-Profile1] poe mode
signal
[H3C-poe-profile-Profile1] poe
priority critical
[H3C-poe-profile-Profile1] poe
max-power 3000
[H3C-poe-profile-Profile1] quit
# Display detailed configuration
information for Profile1.
[H3C] display poe-profile name
Profile1
# Create Profile2, and enter poe-profile
view.
[H3C] poe-profile Profile2
# In Profile2, add the PoE policy
configuration applicable to GigabitEthernet1/0/6 through GigabitEthernet1/0/10
ports for users of group A.
[H3C-poe-profile-Profile2] poe enable
[H3C-poe-profile-Profile2] poe mode
signal
[H3C-poe-profile-Profile2] poe
priority high
[H3C-poe-profile-Profile2] poe
max-power 15400
[H3C-poe-profile-Profile2] quit
# Display detailed configuration
information for Profile2.
[H3C] display poe-profile name Profile2
# Apply the configured Profile1 to GigabitEthernet1/0/1
through GigabitEthernet1/0/5 ports.
[H3C] apply poe-profile Profile1
interface GigabitEthernet1/0/1 to GigabitEthernet1/0/5
# Apply the configured Profile2 to GigabitEthernet1/0/6
through GigabitEthernet1/0/10 ports.
[H3C] apply poe-profile Profile2
interface GigabitEthernet1/0/6 to GigabitEthernet1/0/10
