The map_add_del_rule Python API call does not add the rule.

After inspecting the code it turns out that is_add is of u32 type,

but the byte order is not changed, and after cast to u8 the non

zero bytes are lost. Changing the type of is_add

to u8 seems to fix the problem. Alternatively calling ntohl in

vl_api_map_add_del_rule_t_handler, but that is probably

not the desired solution.