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IOS XR is a train of Cisco Systems' widely deployed Internetworking Operating System (IOS), used on their high-end carrier-grade routers such as the CRS series, 12000 series, and ASR9000 series. ==Architecture== According to Cisco's product literature, IOS XR shares very little infrastructure with the other IOS trains, and is instead built upon a "preemptive, memory protected, multitasking, microkernel-based operating system".〔(Cisco IOS XR product literature )〕 The microkernel is provided by QNX.〔(QNX press release ) confirming use of their microkernel in IOS XR〕 IOS XR aims to provide the following advantages over the earlier IOS trains: * Improved high availability (largely through support for hardware redundancy and fault containment methods such as protected memory spaces for individual processes and process restartability) * Better scalability for large hardware configurations (through a distributed software infrastructure and a two-stage forwarding architecture) * A package based software distribution model (allowing optional features such as multicast routing and MPLS to be installed and removed while the router is in service) * The ability to install package upgrades and patches (potentially while the router remains in service) * A web-based GUI for system management (making use of a generic, XML management interface) 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「IOS XR」の詳細全文を読む スポンサード リンク
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