How does Card Crypto knows what ISAKMP policy to use?

 ip access-list extended ACL_SITE1_TO_SITE2 permit ip 10.0.12.0 0.0.0.255 10.0.22.0 0.0.0.255 ! crypto isakmp policy 10 encr aes hash sha256 authentication pre-share group 14 crypto isakmp policy 20 encr aes 256 hash sha512 authentication pre-share group 16 crypto isakmp key cisco123 address 200.0.2.2 ! crypto ipsec transform-set [TRANS_SET]PHASE_2 esp-aes esp-sha256-hmac mode tunnel ! crypto map [CRYPT_MAP]VPN_SITE1_TO_SITE2 11 ipsec-isakmp set peer 200.0.2.2 set transform-set [TRANS_SET]PHASE_2 match address ACL_SITE1_TO_SITE2 ! interface FastEthernet0/0 ip address 200.0.1.1 255.255.255.0 crypto map [CRYPT_MAP]VPN_SITE1_TO_SITE2

How does Card Crypto knows what ISAKMP policy to use, or use of the ISAKMP policy at all?

It comes from "ipsec-isakmp?

I mean... I do not see any "set isakmp policy 10" in the Crypto map

This is what he chooses just the top-down approach?

As part of the negotiation of the phase 1 and is a top-down proposal based on the sequence number.  You can get the details in tunnel using configuration:

Debug crypto ISAKMP

Cisco IOS has built/strategies default ISAKMP, but the pre 15.x versions were terrible default.  New default values are strong, although I still like to configure them myself.

Tags: Cisco Security

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