Redhat – Grab mac address using udev on RHEL

This is odd. Since you are experiencing loss on both nics I would suspect that this would rule out a nic specific firmware issue, a kernel driver issue, or a faulty hardware issue (Except with respect to the motherboard). Although the logs you have posted are specific to BNX2. Have you verified that other machines connected to this same switch with the same hardware profile are not exhibiting the same problem? You should try hard coding the nics to 100 mbit/full as well as the switch, and as silly as it sounds check for faulty cabling. Finally, if resources permit why not try hooking up that machine to a third party switch (like a netgear or something equally innocuous). ?

If multiple nodes are experiencing link loss simultaneously I would go as far as to say that you may have a spanning tree error that is consistently casing your switch to fail and re converge. Any more information as to topology would help diagnose the issue.

You can use the lsb_release command on various Linux distributions:

lsb_release -i -r 

This will tell you the Distribution and Version and is a little bit more accurate than accessing files that may or may not have been modified by the admin or a software package. As well as working across multiple distros.

For RHEL, you should use:

cat /etc/redhat-release