'Add aggregate host.
:param ctxt: request context
:param aggregate:
:param host_param: This value is placed in the message to be the \'host\'
parameter for the remote method.
:param host: This is the host to send the message to.'

def add_aggregate_host(self, ctxt, host, aggregate, host_param, slave_info=None):

    version = '4.0'
    cctxt = self.router.client(ctxt).prepare(server=host, version=version)
    cctxt.cast(ctxt, 'add_aggregate_host', aggregate=aggregate, host=host_param, slave_info=slave_info)
