CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
vnet_error_trace_t *t = va_arg (*va, vnet_error_trace_t *);
- s = format (s, " rx:%d", t->sw_if_index);
+ s = format (s, "rx:%U", format_vnet_sw_if_index_name,
+ vnet_get_main (), t->sw_if_index);
return s;
}