Specifications

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Catalyst 4500 Se ries S wit ch C is co IO S C om mand R efer ence —Re lease I OS XE 3 .3.0 XO(1 5.1 (1)XO)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
power inline four-pair forced
power inline four-p air forced
To automatically enable power on both signal and spare pairs from a switch port, provided the end-device
is PoE capable on both signal and spa re pair s but does not support the CDP or LLDP extensi ons requir ed
for UPOE, use the power inline four-pair forced command.
power inl ine fou r-pai r forc ed
Syntax Description This command has no arguments or keywords.
Defaults None
Command Modes Interface configur ation mode
Usage Guidelines Although IEEE 802.at onl y provides fo r power up to 30W per port, the WS-X4748 -UPOE+E modu le can
provide up to 60W using the spare pair of an RJ45 cable (wires 4,5,7,8) with the signal pair (wires
1,2,3,6). Power on the spare pair is enabled when the switch port and end-device mutually identify
themselves as UPOE capable using CDP or LLDP and the end-device requests for power on the spare
pair to be enabled. When the spare pair is powered, th e end-devic e can negotiate up to 60W power from
the switch using CDP or LLDP.
If the end-device is PoE capable on both signa l and spare pairs but does no t support the CDP or LLDP
extensions required for UPOE, then the following configuration automatically enables power on both
signal and spare pairs from the switc h port
Examples The following example shows how to automatically enable power on both signal and spare pairs from
switch port gigabit ethernet 2/1:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gigabitethernet 2/1
Switch(config-if)# power inline four-pair forced
Switch(config-if)# shutdown
Switch(config-if)# no shutdown
Switch(config-if)# end
Switch#
Do not enter this command if the end-device is incapable of sourcing inline power on the spare pair or
if the end-device supports the CDP or LLD P extensions for UPOE.