s_surf_parsing_link_up_down_t link_up_down;
link_up_down.link_up = xbt_lib_get_or_null(link_lib, host->link_up, SURF_LINK_LEVEL);
link_up_down.link_down = xbt_lib_get_or_null(link_lib, host->link_down, SURF_LINK_LEVEL);
s_surf_parsing_link_up_down_t link_up_down;
link_up_down.link_up = xbt_lib_get_or_null(link_lib, host->link_up, SURF_LINK_LEVEL);
link_up_down.link_down = xbt_lib_get_or_null(link_lib, host->link_down, SURF_LINK_LEVEL);
xbt_assert(link_up_down.link_up, "Link '%s' not found!",host->link_up);
xbt_assert(link_up_down.link_down, "Link '%s' not found!",host->link_down);
xbt_assert(link_up_down.link_up, "Link '%s' not found!",host->link_up);
xbt_assert(link_up_down.link_down, "Link '%s' not found!",host->link_down);