+- ``<start_hdr>``: Indicate what is the start header mode (`none` (eth), `dsa`, `ext_dsa` or `custom`).
+
+- ``<forward_bad_frames>``: Indicate whether to forward or drop l2 bad packets (0 or 1).
+
+- ``<fill_bpool_buffs>``: Control the amount of refill buffers (default is 64).