nb0->current_data = b0->current_data;
nb0->total_length_not_including_first_buffer = 0;
nb0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID | flags;
+ nb0->trace_handle = b0->trace_handle;
clib_memcpy_fast (&nb0->opaque, &b0->opaque, sizeof (nb0->opaque));
clib_memcpy_fast (vlib_buffer_get_current (nb0),
vlib_buffer_get_current (b0), length);