手法を比較

	Multiprotocol Label Switching (MPLS)	Border Gateway Protocol (BGP)	OSPF（Open Shortest Path First）	ソフトウェア定義ネットワーク（SDN）
分野	通信工学	通信工学	通信工学	通信工学
系統	Process / pipeline	Process / pipeline	Process / pipeline	Process / pipeline
提唱年	2001	1989	1998	2008
提唱者	IETF MPLS Working Group	IETF Routing Protocols Working Group	John Moy	Nick McKeown et al.
種類	label-based forwarding paradigm	path-vector routing protocol	link-state routing protocol	programmable network paradigm
原典	Rosen, E. C., Viswanathan, A., & Callon, R. (2001). Multiprotocol Label Switching Architecture. RFC 3031.	Rekhter, Y., Li, T., & Hares, S. (2006). A Border Gateway Protocol 4 (BGP-4). RFC 4271.	Moy, J. T. (1998). OSPF Version 2. RFC 2328.	McKeown, N., Anderson, T., Balakrishnan, H., et al. (2008). OpenFlow: enabling innovation in campus networks. ACM SIGCOMM Computer Communication Review, 38(2), 69-74.
別名	label switching, traffic engineering	exterior gateway protocol, inter-domain routing	link-state routing, intra-domain routing	network virtualization, programmable networks
関連	4	2	2	4
概要	Multiprotocol Label Switching (MPLS) is a forwarding paradigm that prepends a short label to packets, enabling routers to make forwarding decisions based on the label rather than IP destination address. Introduced by IETF (2001), MPLS was designed to enable traffic engineering, VPN creation, and fast rerouting in IP networks. While MPLS complexity is high, it remains foundational in service provider backbones for traffic engineering and Quality of Service (QoS) provisioning.	BGP is the de facto standard routing protocol for interconnecting autonomous systems (ASs) on the Internet. Since its introduction in 1989, BGP has scaled the Internet to millions of routers and trillions of destinations. BGP is path-vector-based, using a flexible policy system to control route propagation and selection. While BGP convergence can be slow and policies complex, it remains the only viable protocol for Internet-scale inter-domain routing.	OSPF is a link-state interior gateway protocol (IGP) for routing within an autonomous system. Introduced by John Moy in 1998, OSPF converges faster than distance-vector protocols and supports equal-cost multipath (ECMP). It remains widely deployed in enterprise and ISP networks for intra-domain routing, though IS-IS is increasingly preferred in large backbones.	Software-Defined Networking (SDN) is a network architecture paradigm that decouples the control plane (routing decisions) from the data plane (packet forwarding). Introduced by McKeown et al. (2008) with OpenFlow, SDN enables network programmability by centralizing control logic in software-based controllers that direct forwarding behavior of simple programmable switches. SDN has transformed network operations, enabling rapid service deployment, traffic engineering, and cloud integration. It is now foundational in data centers and service provider networks.