+
+ port_pair_chain = map(lambda port_pair_group_id: self._get_port_pair(port_pair_group_id, compute),
+ self.port_pair_groups)
+ ingress_ports = map(lambda port_pair: port_pair.ingress, port_pair_chain)
+ egress_ports = map(lambda port_pair: port_pair.ingress, port_pair_chain)
+ chain_start = ingress_ports[0]
+ chain_rest = ingress_ports[1:]
+