- Cisco IOS XR found in service providers routers like 12000 series cisco IOS XR.
- Cisco IOS XR originally designed for 64 bit operations. As somewhat equal to NX-OS, Cisco IOS XR offers many enhancements like multiprocessing, separate memory spaces etc.
- Cisco IOS XR activates only services that are needed.
- Cisco IOS XR built on QNX neutrino micro kernel, QNX is quite similar to Unix.
- Features cisco IOS XR offers that are not found in NXOS. This has ability to have single instance of OS Controlling multiple Chassis.
- Cisco IOS XR offers supports for interfaces such as DWDM(dense wavelength division multiplexing) and packet over SONET.
- The basic difference found in NXOS is when you're finished entering Configuration commands in your cisco IOS XR you need to commit your changes to make them effect before exiting configuration mode. And to erase the current config user commit replace.
- Cisco IOS XR is a train of cisco systems widely deployed internetworking operating systems(IOS), used in higher end network converging systems (NCS), carrier-grade routers such as the CRS series, 12000 series and ASR9000 series
Advantages of cisco IOS XR:
- Largely supports hardware redundancy and fault containment methods such as protected memory spaces for individual processes and process restart ability, which gives improved high availability for the network.
- Better scalability for large hardware configurations through 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 packages upgrades and packages while router remains in service.
- A Web-based GUI for system management, making use of a generic, XML management interface.
Note: Not all IOS XR models supports ISSU. Only some models supported by ISSU.
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