Long time Cisco employee here. I started as part of an acquisition.
A word of advice: Drag your feet on every integration to cisco tools, services, and experiences, and jump to a new Cisco team at your first opportunity.
Cisco buys acquisitions to gut them and su-k them dry. The more integrated you become, the more "overlap" there will be. Anyone in HR, Legal, Finance - jump to a new team at Cisco as soon as possible. You're expendable.
Cisco will lay off the majority of splunk employees. Just be aware.