What is NX-OS?
NX-OS is the new operating system for the Nexus data center switching equipment.
While it is similar to the Cisco IOS in that most of the commands are the same, there are some big fundamental differences. I personally find using NX-OS to be easier than IOS.
Some examples of BIG differences between the two:
1.) Show commands - NX-OS allows show commands to be issued at any mode when IOS the "do show" command has to be issued while in a mode higher than privileged exec mode.
2.) Features have to be turned on - To run/configure any routing protocols, tunnels, or even vlans, those features have to be turned on in NX-OS by issuing the "feature [ feature name ]". Otherwise, the box will not recognize any commands relating to that feature.
>> Ex. without issuing "feature interface-vlan" command, you cannot configure "interface vlan #"
3.) Using /prefix when configuring interface ips - instead of typing out:
"ip address 192.168.1.1 255.255.255.0" this can be simplified to:
"ip address 192.168.1.1 /24"
Simple and so time saving.
4.) No range key word to configure multiple interfaces
There are many more differences between the two operating systems - most of which I find to be quite useful when configuring devices (especially once you get used to it)
More notes on differences between them:
http://docwiki.cisco.com/wiki/Cisco_NX-OS/IOS_Interface_Comparison
For the full NX-OS command reference list:
http://www.cisco.com/en/US/products/ps9372/prod_command_reference_list.html
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