What can I saw here is FEX and Switch is different version. So what is potential problem. Right now I facing link N5k to FEX keep repeatly lost between 10 minutes. Is that related with this mismatch version. I also detected below log :
%ETHPORT-3-IF_NON_CISCO_TRANSCEIVER: Non-Cisco transceiver on interface Ethernet1/32 is detected
The FEX operates as what you could consider as a remote line card of the Nexus 5000 switch, and when booted downloads software from the upstream switch. As you've stated, what you're seeing here is that the switch is running one version of NX-OS and the FEX a different version. When you have a version mismatch the FEX should download the software version of the parent switch.
What model of FEX are you trying to connect? My guess is that it's a hardware type not supported by your current NX-OS version on the Nexus 5000 such as the N2K-C2248TP-E-1GE which was supported from 5.1(3)N1(1), or more likely the N2K-C2232TM-E-10GE which was supported from 5.2(1)N1(1a).
If you're trying to connect one of the aforementioned FEX models then you have no choice but to upgrade the NX-OS on the Nexus 5000.
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