We are using a Single port of Core device for MPLS connectivity for 22 devices.
For that how we can discover a connection from 22 devices to core device single port?
Note :-there are no sub-interfaces at core device.
I'm curious: how do you connect 22 devices on a single physical port?
Sounds like you can use either a Fanout or a SharedMediaLink model (I would suggest the SharedMediaLink as it's not as "heavy" with fault isolation and you can set alarming thresholds on it). Connect everything to the SharedMediaLink model.