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Shortest Path Bridging (SPB), specified in the IEEE 802.1aq standard, is a computer networking technology intended to simplify the creation and configuration of networks, while enabling multipath routing.〔 〕〔 〕〔 〕 It is the replacement for the older spanning tree protocols: IEEE 802.1D, IEEE 802.1w, IEEE 802.1s. These blocked any redundant paths that could result in a layer 2 loop, whereas SPB allows all paths to be active with multiple equal cost paths, provides much larger layer 2 topologies,〔 〕 supports faster convergence times, and improves the efficiency by allowing traffic to load share across all paths of a mesh network.〔 〕〔 〕〔 〕〔 〕 It is designed to virtually eliminate human error during configuration and preserves the plug-and-play nature that established Ethernet as the de facto protocol at Layer 2.〔 The technology provides logical Ethernet networks on native Ethernet infrastructures using a link state protocol to advertise both topology and logical network membership. Packets are encapsulated at the edge either in media access control-in-media access control (MAC-in-MAC) ''802.1ah'' or tagged ''802.1Q/802.1ad'' frames and transported only to other members of the logical network. Unicast, multicast, and broadcast are supported and all routing is on a symmetric shortest paths. The control plane is based on the Intermediate System to Intermediate System (IS-IS), leveraging a small number of extensions defined in RFC 6329〔 〕 ==History== On 4 March 2006 the working group posted 802.1aq draft 0.1. In December 2011 Shortest path bridging (SPB) was evaluated by the JITC and approved for deployment within the US Department of Defense (DoD) because of the ease in integrated OA&M and interoperability with current protocols.〔 〕 On March 2012 the IEEE approved the 802.1aq standard.〔 (【引用サイトリンク】url = http://www.ietf.org/mail-archive/web/spb-isis/current/msg00043.html ) 〕 In May 2013 the first public multi-vendor interoperability was demonstrated as SPB served as the backbone for Interop 2013 in Las Vegas.〔(Interop: Networking Leaders Demo Shortest Path Bridging )〕 The 2014 Winter Olympics was the first "fabric-enabled" Games using Shortest Path Bridging (SPB) "IEEE 802.1aq" technology.〔(【引用サイトリンク】url=http://www2.avaya.com/ru/sochi2014/ )〕 During the games this fabric network was capable of handling up to 54,000 Gbit/s (54 Tbit/s) of traffic. In 2013 and 2014 SPB was used to build the InteropNet backbone with only 1/10 the resources of prior years. During Interop 2014 SPB was used as the backbone protocol which can enable Software-defined networking (SDN) functionalities.〔(【引用サイトリンク】 url=http://rtomaszewski.blogspot.com/2014/04/can-i-use-shortest-path-bridging.html )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「IEEE 802.1aq」の詳細全文を読む スポンサード リンク
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