Type of session affinity to use. The default is NONE. Only NONE and HEADER_FIELD are supported when the backend service is referenced by a URL map that is bound to target gRPC proxy that has validateForProxyless field set to true. For more details, see: Session Affinity.
2-tuple hash on packet's source and destination IP addresses. Connections from the same source IP address to the same destination IP address will be served by the same backend VM while that VM remains healthy.
ClientIpNoDestination
1-tuple hash only on packet's source IP address. Connections from the same source IP address will be served by the same backend VM while that VM remains healthy. This option can only be used for Internal TCP/UDP Load Balancing.
ClientIpPortProto
5-tuple hash on packet's source and destination IP addresses, IP protocol, and source and destination ports. Connections for the same IP protocol from the same source IP address and port to the same destination IP address and port will be served by the same backend VM while that VM remains healthy. This option cannot be used for HTTP(S) load balancing.
ClientIpProto
3-tuple hash on packet's source and destination IP addresses, and IP protocol. Connections for the same IP protocol from the same source IP address to the same destination IP address will be served by the same backend VM while that VM remains healthy. This option cannot be used for HTTP(S) load balancing.
GeneratedCookie
Hash based on a cookie generated by the L7 loadbalancer. Only valid for HTTP(S) load balancing.
HeaderField
The hash is based on a user specified header field.
HttpCookie
The hash is based on a user provided cookie.
None
No session affinity. Connections from the same client IP may go to any instance in the pool.
UndefinedSessionAffinity
A value indicating that the enum field is not set.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-08 UTC."],[[["\u003cp\u003eThis page details the \u003ccode\u003eSessionAffinity\u003c/code\u003e enum within the \u003ccode\u003eGoogle.Cloud.Compute.V1\u003c/code\u003e namespace, offering various options for managing session affinity in Google Cloud's load balancing services.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version of the API documented is 3.6.0, with documentation available for versions ranging back to 1.0.0, all of which relate to \u003ccode\u003eBackendService.Types.SessionAffinity\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eSessionAffinity\u003c/code\u003e enum supports session persistence options, including \u003ccode\u003eClientIp\u003c/code\u003e, \u003ccode\u003eClientIpNoDestination\u003c/code\u003e, \u003ccode\u003eClientIpPortProto\u003c/code\u003e, \u003ccode\u003eClientIpProto\u003c/code\u003e, \u003ccode\u003eGeneratedCookie\u003c/code\u003e, \u003ccode\u003eHeaderField\u003c/code\u003e, \u003ccode\u003eHttpCookie\u003c/code\u003e, and \u003ccode\u003eNone\u003c/code\u003e, each offering different levels of affinity.\u003c/p\u003e\n"],["\u003cp\u003eThe default type of session affinity is \u003ccode\u003eNone\u003c/code\u003e, and certain options, like \u003ccode\u003eNONE\u003c/code\u003e and \u003ccode\u003eHEADER_FIELD\u003c/code\u003e, are only available if the backend service is bound to a URL map.\u003c/p\u003e\n"],["\u003cp\u003eEach of the types of session affinity options have specific requirements, such as \u003ccode\u003eClientIpNoDestination\u003c/code\u003e being limited to Internal TCP/UDP Load Balancing and \u003ccode\u003eClientIpPortProto\u003c/code\u003e and \u003ccode\u003eClientIpProto\u003c/code\u003e not being useable for HTTP(S) load balancing.\u003c/p\u003e\n"]]],[],null,[]]
