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We recommend that you enable power policing when PoE is enabled on your switch. For example, if policing
is disabled and you set the cutoff-power value by using the power inline auto max 6300 interface configuration
command, the configured maximum power allocation on the PoE port is 6.3 W (6300 mW). The switch
provides power to the connected devices on the port if the device needs up to 6.3 W. If the CDP-power
negotiated value or the IEEE classification value exceeds the configured cutoff value, the switch does not
provide power to the connected device. After the switch turns on power on the PoE port, the switch does not
police the real-time power consumption of the device, and the device can consume more power than the
maximum allocated amount, which could adversely affect the switch and the devices connected to the other
PoE ports.
Because the switch supports internal power supplies and the Cisco Redundant Power System 2300 (also
referred to as the RPS 2300), the total amount of power available for the powered devices varies depending
on the power supply configuration.
•
If a power supply is removed and replaced by a new power supply with less power and the switch does
not have enough power for the powered devices, the switch denies power to the PoE ports in auto mode
in descending order of the port numbers. If the switch still does not have enough power, the switch then
denies power to the PoE ports in static mode in descending order of the port numbers.
•
If the new power supply supports more power than the previous one and the switch now has more power
available, the switch grants power to the PoE ports in static mode in ascending order of the port numbers.
If it still has power available, the switch then grants power to the PoE ports in auto mode in ascending
order of the port numbers.
How to Configure PoE
Configuring a Power Management Mode on a PoE Port
For most situations, the default configuration (auto mode) works well, providing plug-and-play operation. No
further configuration is required. However, perform this task to configure a PoE port for a higher priority, to
make it data only, or to specify a maximum wattage to disallow high-power powered devices on a port.
When you make PoE configuration changes, the port being configured drops power. Depending on the new
configuration, the state of the other PoE ports, and the state of the power budget, the port might not be powered
up again. For example, port 1 is in the auto and on state, and you configure it for static mode. The switch
removes power from port 1, detects the powered device, and repowers the port. If port 1 is in the auto and on
state and you configure it with a maximum wattage of 10 W, the switch removes power from the port and
then redetects the powered device. The switch repowers the port only if the powered device is a class 1, class
2, or a Cisco-only powered device.
SUMMARY STEPS
1.
configure terminal
2.
interface interface-id
3.
power inline {auto [max max-wattage] | never | static [max max-wattage]}
4.
end
5.
show power inline [interface-id | module switch-number]
Catalyst 2960-X Switch Interface and Hardware Component Configuration Guide, Cisco IOS Release 15.0(2)EX
OL-29034-01 81
Configuring PoE
How to Configure PoE
- Americas Headquarters 1
- CONTENTS 3
- Contents 4
- OL-29034-01 v 5
- OL-29034-01 vii 7
- Document Conventions 9
- Timesaver 10
- Related Documentation 11
- Command Modes 13
- Table 1: Command Mode Summary 14
- Using the Help System 15
- CLI Error Messages 16
- Configuration Logging 17
- Recalling Commands 18
- SUMMARY STEPS 19
- DETAILED STEPS 19
- Example: 20
- 12 OL-29034-01 24
- Finding Feature Information 25
- Port-Based VLANs 26
- Switch Ports 26
- Switch Virtual Interfaces 27
- EtherChannel Port Groups 28
- Power over Ethernet Ports 28
- Using the Switch USB Ports 29
- Interface Connections 30
- Interface Configuration Mode 31
- OL-29034-01 21 33
- IEEE 802.3x Flow Control 34
- Monitoring Interface Status 46
- OL-29034-01 35 47
- Characteristics 51
- 40 OL-29034-01 52
- Configuring Auto-MDIX 53
- How to Configure Auto-MDIX 54
- Monitoring Auto-MDIX 55
- 46 OL-29034-01 58
- OL-29034-01 49 61
- 50 OL-29034-01 62
- Location Service 63
- LLDP-MED 64
- LLDP-MED Supported TLVs 65
- Wired Location Service 66
- Default LLDP Configuration 67
- Configuration Guidelines 67
- Enabling LLDP 68
- Configuring LLDP-MED TLVs 71
- OL-29034-01 69 81
- 70 OL-29034-01 82
- Configuring System MTU 83
- How to Configure MTU Sizes 84
- 74 OL-29034-01 86
- Configuring PoE 87
- Information about PoE 88
- OL-29034-01 77 89
- Power Management Modes 90
- OL-29034-01 79 91
- Power Consumption Values 92
- How to Configure PoE 93
- Configuring Power Policing 97
- Monitoring Power Status 100
- Configuring EEE 101
- Restrictions for EEE 102
- How to Configure EEE 102
- Monitoring EEE 103
- Additional References 104
- ModificationRelease 105
- 94 OL-29034-01 106
- OL-29034-01 IN-1 107
- IN-2 OL-29034-01 108
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