Based on its name and its position among the per-interface DCBX statistics, this counter appears to track the number of times a previously detected DCBX peer was removed or aged out on this port. Its source MIB description is just a placeholder, so the exact trigger conditions aren't documented, but as an Unsigned32 counter alongside agentDcbxMultiplePeerCount it likely increments whenever the local DCBX state machine loses contact with a peer, for example after a link partner reboots or a keepalive timeout occurs. As an illustrative example, an admin watching a port that repeatedly cycles between having a DCBX peer and having none might see agentDcbxPeerRemovedCount steadily increase, hinting at an intermittent link problem.