I have two 515e in a failover pair. One has UR and the other FO licenses. The IOS version is 7.21.
They are failing over every minute or so. When I connected the console, it showed a lot of information like what you get in 'sh tech' and then it rebooted. Same thing is happening with the other device too. I have upgraded them from version 6.3 to 7.21 last week Thursday.
Can someone advise?
There was a very common bug related to esmtp inspection. I would first recommend disabling esmtp inspection. Here is how you can do so-
no inspect esmtp
However, if this does not help, I would request you to provide the log you are getting on console. Basically, it is "traceback". You can also get the same from "show crash".