* this sw_if_index, l2-output will send packets for this sw_if_index to the
* l2-output-bad-intf node which just setup the proper drop reason before
* sending packets to the error-drop node to drop the packet. Then, stale L2FIB
* this sw_if_index, l2-output will send packets for this sw_if_index to the
* l2-output-bad-intf node which just setup the proper drop reason before
* sending packets to the error-drop node to drop the packet. Then, stale L2FIB