Running 'vale-ctl -l' passes a null as an argument. Workaround is 'vale-ctl -l ""', to list all vale interfaces. Building vale switch to test netmap. vale-ctl -h vale1:bridge0 vale-ctl -l vale-ctl: option requires an argument -- l bad option ? (null)Usage: vale-ctl arguments -g interface interface name to get info -d interface interface name to be detached -a interface interface name to be attached -h interface interface name to be attached with the host stack -n interface interface name to be created -r interface interface name to be deleted -l list all or specified bridge's interfaces (default) -C string ring/slot setting of an interface creating by -n vale-ctl -l "" bdg_ctl [149] bridge:0 port:0 vale1:bridge0 bdg_ctl [149] bridge:0 port:1 vale1:bridge0^