pdnDot1dTpPortOutFrames is a read-only Counter of frames transmitted by this port to its segment, counted only when the frame is for a protocol processed by the local bridging function, including bridge management frames. Admins use this per-port counter to gauge outbound bridging traffic volume and to compare against inbound counts on other ports when tracing where traffic is being forwarded. For example, a steadily rising pdnDot1dTpPortOutFrames on an uplink port would confirm that bridge is actively forwarding traffic out toward the rest of the network.