No carrier is usually fairly specific. it means that the interface is up but has no carrier to send a message on. start with step 1 obviously and verify at each step before moving to the next to check if you are still getting "no carrier" in the nic status when running ifconfig from the affected node.  1. checking that the cable is securely seated in both the nic port and switch port ends 2. if still shows no carrier try swapping with a cord you know for sure is good 3. try plugging into a different switch port 4. if no additional switch ports are available or you are still seeing "no carrier" contact your network team and verify that the switch port is actually enabled to send and receive traffic.
I have a Isilon cluster version 7.2.1.1 where not raise me 10GB optical. The light on the NICs is fine. light in the fibers as well. The connection is correct. No hardware errors.   Any ideas ?   Thanks !!
No Carrier in 10GB Optical Card in Isilon Cluster ?