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Encapsulating Security Payload (ESP) is a member of the Internet Protocol Security (IPsec) set of protocols that encrypt and authenticate the packets of data between computers using a Virtual Private Network (VPN).
The Security Parameter Index (SPI) is a value that is sent with every ESP packet, and is used as a means of matching incoming ESP packets to the correct IPsec tunnel on the VPN endpoint.
The SPI ? a unique and random 32-bit value that, together with the destination IP address and security protocol, uniquely identifies the SA for the packet. The sequence number ? a monotonically increasing 32-bit counter used to protect against replay attacks. When an SA is established the sequence number is reset to 0.
The Security Parameter Index (SPI) is an identifier used to uniquely identify both manually and dynamically established IPSec Security Associations. For manual Security Associations, the SPI is configured by the customer. For dynamic Security Associations, the SPI is generated by IKED.
The SPI is an identification tag carried in the IPsec ESP header. It enables the receiving OSPF process to select and use the Security Association (SA) from the SA table. The SPI must be unique on the switch. Range: 256 to 4294967295.