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IOS XR is a train of Cisco Systems' widely deployed Internetworking Operating System (IOS), used on their high-end Network Converging System (NCS), carrier-grade routers such as the CRS series, 12000 series, 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 was formerly provided by QNX; versions 6.0 onwards use the Wind River Linux distribution.
IOS XR aims to provide the following advantages over the earlier IOS trains:
Other significant releases include the following.
Example BGP configuration for both IOS and IOS XR. More examples can be found in the Cisco document Converting Cisco IOS Configurations to Cisco IOS XR Configurations.
! Cisco IOS ! router bgp 109 no synchronization bgp log-neighbor-changes neighbor 203.0.113.1 remote-as 109 neighbor 203.0.113.1 update-source Loopback0 no auto-summary ! ! Cisco IOS XR ! router bgp 109 neighbor 203.0.113.1 remote-as 109 update-source Loopback0 ! !
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