ISAKMP is also commonly known as IKE (Internet key exchange) or ISAKMP/Oakley.
Oakley is used along side ISAKMP, and is now commonly known as IKE (Internet Key Exchange). Basically Oakley is a protocol to carry out the key exchange negotiation process for both peers, in which both ends after being authenticated can agree on secure and secret keying material. Oakley is based on the Diffie-Hellman key algorithm in which two gateways can agree on a key without the need to encrypt.
key requirements achieved using ISAKMP;
Management of keys
Authentication - To authenticate peer gateway devices
Manage Security Associations
Protection against Denial of service and replay attacks
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