def get_port_switch_bindings(port_id, switch_ip):
    """List all vm/vlan bindings on a Nexus switch port."""
    LOG.debug("get_port_switch_bindings() called, "
              "port:'%(port_id)s', switch:'%(switch_ip)s'",
              {'port_id': port_id, 'switch_ip': switch_ip})
    try:
        return _lookup_all_nexus_bindings(port_id=port_id,
                                          switch_ip=switch_ip)
    except c_exc.NexusPortBindingNotFound:
        pass