IPSec - crypto-map vs transform-set

The crypto-map command is used to bind or tie together all the various IPSec configuration elements. This includes the transform-set, the Access-List (ACL) that identifies the traffic, and the peer at the other end of the IPSec tunnel.

A transform-set is a combination of security protocols and algorithms. When you define a transform-set, you are essentially defining the methods and protocols that IPSec should use to secure your data.

Both crypto-map and transform-set serve different purposes in the IPSec configuration process and cannot replace each other. The crypto-map command should be used when you are ready to tie together your IPSec configuration and apply it to an interface.