This attribute sets the maximum number of bytes to capture per frame, starting after the frame flag, truncating any frame longer than this value; it defaults to 2000 and can be changed while a trace is active, taking effect immediately. Admins reduce this value to limit how much of each frame gets captured, which can cut down the volume of trace data sent to the receiver when only header information is needed. For example, an admin who only needs to inspect frame headers might lower this to 64 bytes instead of capturing the full default 2000-byte frame.