I have a bunch of servers connected to Nexus 5020s (running NX-OS 4.0(1a)N2(1)) constantly reporting CRC errors on their NICs. CRC errors are reported on the Nexuses’ egress ports, but ingress ports are clean. What’s happening is pretty interesting.
The N5k considers packets with an ‘invalid’ EtherType to be bad. If it were [...]