+int trace_time_cmp (void *a1, void *a2);
+void vlib_trace_stop_and_clear (void);
+int vlib_enable_disable_pkt_trace_filter (int enable) __attribute__ ((weak));
+void trace_update_capture_options (u32 add, u32 node_index,
+ u32 filter, u8 verbose);
+void trace_filter_set (u32 node_index, u32 flag, u32 count);
+void clear_trace_buffer (void);