утилита управления базами данных Open Virtual Network на севере (Open Virtual Network northbound db management utility)
SYNCHRONIZATION COMMANDS
sync Ordinarily, --wait=sb or --wait=hv only waits for changes
by the current ovn-nbctl invocation to take effect. This
means that, if none of the commands supplied to ovn-nbctl
change the database, then the command does not wait at
all. With the sync command, however, ovn-nbctl waits even
for earlier changes to the database to propagate down to
the southbound database or all of the OVN chassis,
according to the argument to --wait.
