They may be interoperable, but IOS is much more stable and consistent than NX-OS. I have been testing with a couple of Nexus 5020s in my lab, running 5.0.3 NX-OS and it is inconsistent. For example, after erasing the startup configuration and rebooting on several occasions, sometimes the default QoS configs would appear and sometimes some statements would be missing.
There are other quirks, too. Cisco needs to focus on the NX-OS and clean it up.
Re: Nexus 5548 5596 to replace Cat 3750 and 4507R??
The qos configuration has changed so the settings you see in 5.0.3 have disabled fcoe to be enabled by default, to allow more buffer for ethernet.
NX-OS is linux based and is build for stability: processes can be restarted without a restart of the switch, and its a hardware cut-trough switch, switching is done in hardware at high performance, the cpu control plane is separated.
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With Vignesh R. P.Welcome to the Cisco Support Community Ask the Expert
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