Hello, I'm new to this list ... I hope that I've understood the scope correctly. I'm looking for reference implementations of IP/MPLS operator networks within ***the metro area***, that do not abstract the underlay (underlying transport). To clarify, I would like to see the underlying multiplexing technology, whether it's wavelengths, OTN, statistical using long-reach Ethernet (e.g. 10GBASE-ER), SONET/SDH. Can anyone suggest a pointer? Sincerely, Etienne -- Ing. Etienne-Victor Depasquale Assistant Lecturer Department of Communications & Computer Engineering Faculty of Information & Communication Technology University of Malta Web. https://www.um.edu.mt/profile/etiennedepasquale