+ if use_sw_index:
+ int_cmd = ('sw_if_index {}'.
+ format(Topology.get_interface_sw_index(node, interface)))
+ else:
+ int_cmd = interface
+
+ rap = 'resolve-attempts {}'.format(resolve_attempts) \
+ if resolve_attempts else ''
+
+ via = 'via {}'.format(gateway) if gateway else ''
+