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Is Cisco IOS XE the same as CIsco Nexus

Posted on 2014-04-01
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Is Cisco IOS XE the same as CIsco Nexus ?


There is also IOS XR. how different it is  from IOS ? I believe there is also IOS NX, and IOS 15.

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Question by:jskfan
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Hassan Besher earned 334 total points
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Currently there is three types of software on Cisco Routers. The classical IOS, the IOS XE and the IOS XR.

Classical IOS is on the market for a long time. I start to work with IOS version 10 on Cisco 2500 routers. You will find this IOS on entry level routers like ISR or Enterprise switches like 6500 or 3750. This IOS is a monolythic OS. That means that all the features are in one file and if one function on the system fail most likely all the system fail. Also that mean that if you want to upgrade the Operating System, you need to reboot the system.

IOS XE is a software available for the ASR1K. In fact, in my point of view, it’s like having a Linux with a IOS interface. All the IOS functions are provided by a daemon called IOSD. It is the same interface that the IOS with some minor changes like on the debugs… You could even have access to the Linux interface by typing :

request platform software system shell r0


IOS XR is a Carrier Class IOS, the goal is to provide a more stable solution with process mirroring and advanced features. The interface is really different from the classical IOS. For example when you do change on the configuration, you need to validate the changes with a “commit”. It is pretty good because you could multiple changes and the activate all the changes in one command. Also, that allow you to decide when the changes will be activated. And finally, you’ve got the option to roll back the changes. On the configuration side, instead of having the configuration grouped by interface, it is grouped by process… So you’ve got all together, the OSPF config or the PIM config, instead of having a part of the configuration on the interface and a part of the configuration at the process level.
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<<<that all the features are in one file and if one function on the system fail most likely all the system fail.>>>

--  is it the same case for IOS XE and IOS XR and IOS NX ? or their processes run on different files ?

---I know IOS is the most used in Routing and Switching, with the advent of IOS XE/XR/NX, does that mean classic IOS is going away ? if so for people who are used to IOS commands will have to lear the commands of XE/XR/NX ?

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a question to Hassan from craigbeck…(:)
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