from sfa.util.plxrn import PlXrn, hostname_to_urn, hrn_to_pl_slicename
from sfa.rspecs.rspec import RSpec
from sfa.rspecs.elements.link import Link
+from sfa.managers.vini.topology import PhysicalLinks
from sfa.rspecs.version_manager import VersionManager
from sfa.plc.vlink import get_tc_rate