vdu_id2cp_name = {} # stored only when one external connection point is presented at this VDU
# for iface in chain(vdu.get("internal-interface").itervalues(), vdu.get("external-interface").itervalues()):
for iface in vdu.get("interface").itervalues():
vdu_id2cp_name = {} # stored only when one external connection point is presented at this VDU
# for iface in chain(vdu.get("internal-interface").itervalues(), vdu.get("external-interface").itervalues()):
for iface in vdu.get("interface").itervalues():