2 methods are available (at least)

1) use dhcp snooping

turn on:
(SW)<config># dhcp-snooping enable
(SW)<config># dhcp-snooping vlan 99
(SW)<config># show dhcp-snooping
>> define trusted interface where the dhcp answers are coming from, for example interface 49 (your uplink)

see the clients: (Switch)<config># show dhcp-snooping binding

2) client tracker

turn on: (SW)<config># ip client-tracker
see the clients: show port-access clients

see also:
see also:

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