An operations engineer asks for your help with a new switching deployment. The engineer confirms that STP is enabled on an edge switch, and a particular port is connected to another switch. The switch

Bridge Assurance requires BPDUs to be continuously exchanged on point-to-point links, and if BPDUs stop arriving, Bridge Assurance moves the port to a blocked inconsistent state - causing disruption rather than normal operation.

Storm control broadcast limits the rate of broadcast traffic on a port but has no effect on BPDU transmission or STP operation, so it does not explain the absence of configuration BPDUs.

REP is a Cisco proprietary protocol designed for ring topologies as an alternative to STP. Unlike STP, REP does not use BPDUs for loop prevention - it uses its own REP-specific control messages. When REP is enabled on a port, STP BPDUs are neither sent nor received, which fully explains the absence of configuration BPDUs while the network continues to function correctly.

BPDU Guard err-disables a port upon receiving a BPDU rather than suppressing BPDU transmission, and does not explain why configuration BPDUs are absent on a port connected to another switch.