Zone based firewall
1. Define zones.
2. Define zone−pairs.
3. Define class−maps that describe traffic that must have policy applied as it crosses a zone−pair.
4. Define policy−maps to apply action to your class−maps traffic.
5. Apply policy−maps to zone−pairs.
6. Assign interfaces to zones.
There’s no need to follow the order, however some need to have a prerequisite in order to be accomplished. It is best to leave assignment of zone member last. Once interface has been assigned to zone security membership all traffic that’s not defined in policy map will be dropped implicitly.