手法を比較

	Border Gateway Protocol (BGP)	OSPF（Open Shortest Path First）	トークンバケットレート制限アルゴリズム
分野	通信工学	通信工学	通信工学
系統	Process / pipeline	Process / pipeline	Process / pipeline
提唱年	1989	1998	1986
提唱者	IETF Routing Protocols Working Group	John Moy	Jon Turner
種類	path-vector routing protocol	link-state routing protocol	rate limiting algorithm
原典	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.	Turner, J. S. (1986). New directions in communications (or which way to the information age?). IEEE Communications Magazine, 24(10), 8-15.
別名	exterior gateway protocol, inter-domain routing	link-state routing, intra-domain routing	traffic shaping, rate limiting
関連	2	2	2
概要	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.	Token bucket is a simple and elegant algorithm for traffic shaping and rate limiting. A virtual bucket accumulates tokens at a fixed rate (the committed information rate). Incoming packets consume tokens (one token per byte); packets are transmitted only if sufficient tokens are available. If the bucket is full, excess tokens are discarded (no carry-over). Token bucket bounds peak rate and allows controlled bursts, making it ideal for traffic management in networks.