This method sets attribute mapping to a neighbor.
        attribute mapping can be used when you want to apply
        attribute to BGPUpdate under specific conditions.

        ``address`` specifies the IP address of the neighbor

        ``attribute_maps`` specifies attribute_map list that are used
        before paths are advertised. All the items in the list must
        be an instance of AttributeMap class

        ``route_dist`` specifies route dist in which attribute_maps
        are added.

        ``route_family`` specifies route family of the VRF.
        This parameter must be one of the following.

        - RF_VPN_V4 (default) = 'ipv4'
        - RF_VPN_V6           = 'ipv6'

        We can set AttributeMap to a neighbor as follows::

            pref_filter = PrefixFilter('192.168.103.0/30',
                                       PrefixFilter.POLICY_PERMIT)

            attribute_map = AttributeMap([pref_filter],
                                         AttributeMap.ATTR_LOCAL_PREF, 250)

            speaker.attribute_map_set('192.168.50.102', [attribute_map])

def attribute_map_set(self, address, attribute_maps,
                          route_dist=None, route_family=RF_VPN_V4):
        """This method sets attribute mapping to a neighbor.
        attribute mapping can be used when you want to apply
        attribute to BGPUpdate under specific conditions.

        ``address`` specifies the IP address of the neighbor

        ``attribute_maps`` specifies attribute_map list that are used
        before paths are advertised. All the items in the list must
        be an instance of AttributeMap class

        ``route_dist`` specifies route dist in which attribute_maps
        are added.

        ``route_family`` specifies route family of the VRF.
        This parameter must be one of the following.

        - RF_VPN_V4 (default) = 'ipv4'
        - RF_VPN_V6           = 'ipv6'

        We can set AttributeMap to a neighbor as follows::

            pref_filter = PrefixFilter('192.168.103.0/30',
                                       PrefixFilter.POLICY_PERMIT)

            attribute_map = AttributeMap([pref_filter],
                                         AttributeMap.ATTR_LOCAL_PREF, 250)

            speaker.attribute_map_set('192.168.50.102', [attribute_map])
        """

        if route_family not in SUPPORTED_VRF_RF:
            raise ValueError('Unsupported route_family: %s' % route_family)

        func_name = 'neighbor.attribute_map.set'
        param = {
            neighbors.IP_ADDRESS: address,
            neighbors.ATTRIBUTE_MAP: attribute_maps,
        }
        if route_dist is not None:
            param[vrfs.ROUTE_DISTINGUISHER] = route_dist
            param[vrfs.VRF_RF] = route_family

        call(func_name, **param)