Connectivity Fault Management auto-provisioning using Virtual Private LAN Service auto-discovery is described. Relieved areas may be created in the elastic interface by removing at least some of the elastic material of the interface, leaving a mesh with nodes. The plurality of linear conductors are made up of conductors 200 located near the central axis and conductors 201 located far from the central axis and the ring conductors 202, 203 have star-like polygonal shape so that the linear conductors are arranged alternately. In a specific embodiment, the balun includes a first waveguide.