Overview

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. IOS XR is a train of Cisco Systems' widely deployed Internetworking Operating System, used on their high-end carrier-grade routers such as the CRS-1, 12000, and ASR9000 series. 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. The microkernel is provided by QNX. IOS XR was announced along with the CRS-1 in May 2004. The first generally available version was 2.0; the first version generally available for the 12000 router series was 3.2. Version 3.9 was the first generally available version for the ASR9000 series. The most recent release is 4.2 which was released on December 23rd, 2011.

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