Cisco NX-OS and Cisco IOS Comparison

• When you first log in to NX-OS, you go directly into EXEC mode
• NX-OS has a setup utility that enables a user to specify the system defaults, perform basic configuration, and apply a predefined Control Plane Policing (CoPP) security policy
• NX-OS uses a feature-based license model. This enables flexibility in licensing for uses in different areas of the network in which not all features are required
• NX-OS has the capability to enable and disable features such as OSPF, BGP, and so on via the feature configuration command. Configuration and verification commands are not available until you enable the specific feature
• Interfaces are labeled in the configuration as Ethernet. There aren’t any speed designations in the interface name. Interface speed is dynamically learned and reflected in the appropriate show commands and interface metrics
• Secure Shell version 2 (SSHv2) is enabled by default. (Telnet is disabled by default.)
• The default login administrator user is predefined as admin; a password must be specified when the system is first powered up. With NX-OS, you must enter a username and password; you cannot disable the username and password login
• The default Spanning Tree mode in NX-OS is Rapid-PVST+
• Caution In NX-OS, you must enable features such as OSPF, BGP, and CTS (Cisco Trust Sec). If you remove a feature via the no feature command, all relevant commands related to that feature are removed from the running configuration