A power budget is the total electrical power a switch can allocate to connected powered devices (PDs). The switch tracks available, used, and remaining power so PoE devices such as IP phones and wireless access points receive appropriate power. section 10.1.2
Manage the budget through port allocation and protection features:
- Use the default auto mode to allocate only the power each device needs; use static to reserve a specified amount even when no PD is connected, or never to disable PoE. section 10.1.2
- Use CDP and LLDP to communicate PoE requirements and help prevent devices from drawing excessive power. section 10.1.2
- Enable power inline police when excess draw must be contained; exceeding cutoff power places the port into error-disabled state. section 10.1.2
SW1# show power inline
Available:124.0(w) Used:30.8(w) Remaining:93.2(w) #1
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Fa0/1 auto on 15.4 AIR-CAP3502I-E-K9 3 15.4 #2
Fa0/2 auto on 15.4 AIR-CAP3502E-E-K9 3 15.4 #2
Fa0/3 auto off 0.0 n/a n/a 15.4
. . .
#1 Information about the available power budget
#2 The two PDs are class 3, meaning the switch allocates 15.4 watts each.
Use the annotated show power inline output to verify the available, used, and remaining budget, along with each port’s allocated watts and device class. section 10.1.2
