# File lib/fog/network/openstack/models/ipsec_policy.rb, line 29
        def update
          requires :id, :name, :auth_algorithm, :encryption_algorithm,
                   :lifetime, :pfs, :transform_protocol,
                   :encapsulation_mode
          merge_attributes(service.update_ipsec_policy(id, attributes).body['ipsecpolicy'])
          self
        end