What I'd like to hear from toasters is, first, which interfaces are most stable, whether single port, quad port, or Gbit, and whether anyone has had any experience with the relative reliability of fast etherchannel vs. Gbit.
I've got the same problems. Seems to me like the on board NIC on the 760s is more flaky that the QFE. But I've seen both sit there in a state of 'flapping' just going up-down, up-down.
Thankfully the filers have nice NIC redundancy with virtual interfaces etc but that functionality is not in the caches.
How many others have seen the same problems?