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alessandros1 · ‎Jul 18 2025

Thanks to all for the replies. Briefly, what i can understand is: Catalyst switches, when powering devices, takes "budget" in account, instead to consider "consumption" as MS switches do; referring to my first example, If i use a CDP/LLDP capable AP i'll be able to connect it to the switch, as the total consumption will be less then the switch capability; still referring to my first example, if i use a non-capable CDP/LLDP AP, i'll not be able to connect as the switch will not be able to adjust the power to the real consumption, tries to put 30W but the switch can draw only 28W. Probably i will test if i can in the future

alessandros1 · ‎Jul 17 2025

thanks again for the reply, so in the end i will be able to connect all 5 the APs as the total consumption will be 24W x 5 = 120W that is less than the switch capability, correct? but what if i in addition to the four cisco APs, i will connect a PoE+ device that is not CDP capable?

alessandros1 · ‎Jul 17 2025

Hi RWelch Thanks for your reply, this is something i read in the documentation, but my doubt is the following: as per i know, the switch will use CDP or LLDP to negotiate the AP power consumption but, if i'm consuming (not budgeting) 96W yet, and i connect a new AP, i think the switch will provide the maximum admitted power (30W) to the port, until CDP negotiate the power consumption, so the total consumption will be over the 124W provided by the switch. If so, the switch will still be able to power on the device?

alessandros1 · ‎Jul 17 2025

Hi all, something is unclear, to me, about PoE usage in switches, specifically about Consumption vs. Budgeted power. For example, i have an MS120-8PF switch, which provides up to 124W with 30W MAX per port where i connect four 802.3at Cisco APs, the switch will budget 30W per port, so total budgeted power is 120W, but let's assume real consumption will be 24W per AP, so consumption is 96W in total. Now what happens if i connect another AP of the same type?: i'll be able to power it as the real consumption will be 24W x 5 = 120W that is less of 124W provided by the switch? i'll not be able to power it as we are consuming 96W and we have only 28W available, that is less theen 30W that will be budgeted for the port? i'll not be able to power it as the switch budgeted 120W and we have only 4W available? Thanks to anyone that will clarify! Kind Regards

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