This sounds a support related question. We have external and internal subject matter experts in the NetApp Support Community answering questions. If you have a NOW login you can ask in this area Filers.
It looks like something is trying to login using SSH that is not sending proper information. Searching on "openssh.versionExchange.Fail:Error" provides a lot of software patches for devices monitored by SSH calls.
I don't suppose you are using a product called LogicMonitor?
This site refers to their product simply checking/monitoring SSH status, so it generates bogus SSH calls, just to get a reply. Maybe you have a monitoring system that does the same thing?
Changing the ServerAliveInterval was exactly the fix for the problem I was running into, but my warnings were a little different from the original poster:
Wed Jul 31 15:06:38 PDT [filername:openssh.dispatch.protocol:warning]: SSH dispatch failed from address [IP address], type 80, packet 191.
I log into a system that cuts off sessions after a short amount of time, so I had ServerAliveInterval set to 5 minutes on my Mac. Unfortunately, this caused the NetApp to throw a warning on the console every 5 minutes when I was logged in. I increased the interval and the console is *much* cleaner now. Thanks!