h 2005). Encapsulating MPLS in IP or generic routing encapsulation (GRE). Available at: www.ietf.org (accessed May 29, 2020). 57 Pan, P., Swallow, G., and Atlas, A. (Eds.) (May 2005). Fast reroute extensions to RSVP-TE for LSP tunnels. Available at: www.ietf.org (accessed May 29, 2020). 58 Rosen, E. and Rekhter, Y. (February 2006). BGP/MPLS IP virtual private networks (VPNs). Available at: www.ietf.org (accessed May 29, 2020). 59 Martini, L., Rosen, E., El-Aawar, N., and Heron, G.(April 2006). Encapsulation methods for transport of Ethernet over MPLS networks. Available at: www.ietf.org (accessed May 29, 2020). 60 Farrel, A., Vasseur, J.-P., and Ash, J. (August 2006). A path computation element (PCE)-based architecture. Available at: www.ietf.org (accessed May 29, 2020). 6 Enabling Technologies 61 Shalunov, S., Teitelbaum, B., Karp, A., Boote, J., and Zekauskas, M. (September 2006). A one-way active measurement protocol (OWAMP). Available at: www.ietf.org (accessed May 29, 2020). 62 Atlas, A. and Zinin, A. (Eds.) (September 2008). Basic specification for IP fast reroute: loop-free alternates. Available at: www.ietf.org (accessed May 29, 2020). 63 Hedayat, K., Krzanowski, R., Morton, A., Yum, K., and Babiarz, J. (October 2008). A two-way active measurement protocol (TWAMP). Available at: www.ietf.org (accessed May 29, 2020). 64 Katz D. and Ward, D.(June 2010). Bidirectional forwarding detection (BFD). Available at: www.ietf.org (accessed May 29, 2020). 65 Frost, D. and Bryant, S., and Ward, D. (September 2011). Packet loss and delay measure- ment for MPLS networks. Available at: www.ietf.org (accessed May 29, 2020). 66 Frost, D. and Bryant, S. (Eds.) (September 2011). A packet loss and delay measurement profile for MPLS-based transport networks. Available at: www.ietf.org (accessed May 29, 2020). 67 Weingarten, Y., Bryant, S., Osborne, E., Sprecher, N., and Fulignoli, A. (Eds.) (October 2011). MPLS transport profile (MPLS-TP) linear protection. Available at: www.ietf.org (accessed May 29, 2020). 68 Gray, E., Bahad