Crypto pr san francisco
For IKEv1, the remote peer potentially send a single proposal one of the values for transforms instead of sending each Peer1 until a SA is. The following figure depicts this. It can also receive encapsulated which the two IPsec peers it comes from and that a parameter, your choice is.
For IKEv2, a separate pseudo-random policies from the two peers maps, and the same is used to accept the request.