Specifies connection persistence when backends are unhealthy. The default value is DEFAULT_FOR_PROTOCOL. If set to DEFAULT_FOR_PROTOCOL, the existing connections persist on unhealthy backends only for connection-oriented protocols (TCP and SCTP) and only if the Tracking Mode is PER_CONNECTION (default tracking mode) or the Session Affinity is configured for 5-tuple. They do not persist for UDP. If set to NEVER_PERSIST, after a backend becomes unhealthy, the existing connections on the unhealthy backend are never persisted on the unhealthy backend. They are always diverted to newly selected healthy backends (unless all backends are unhealthy). If set to ALWAYS_PERSIST, existing connections always persist on unhealthy backends regardless of protocol and session affinity. It is generally not recommended to use this mode overriding the default. For more details, see Connection Persistence for Network Load Balancing and Connection Persistence for Internal TCP/UDP Load Balancing.
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-08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\u003eConnectionPersistenceOnUnhealthyBackends\u003c/code\u003e enum within the \u003ccode\u003eGoogle.Cloud.Compute.V1\u003c/code\u003e namespace, covering versions from 1.0.0 up to the latest 3.6.0.\u003c/p\u003e\n"],["\u003cp\u003eThe enum specifies how connections persist when backends become unhealthy, with options including \u003ccode\u003eALWAYS_PERSIST\u003c/code\u003e, \u003ccode\u003eNEVER_PERSIST\u003c/code\u003e, and the default \u003ccode\u003eDEFAULT_FOR_PROTOCOL\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe default setting \u003ccode\u003eDEFAULT_FOR_PROTOCOL\u003c/code\u003e ensures that connections persist only for TCP and SCTP when the tracking mode is \u003ccode\u003ePER_CONNECTION\u003c/code\u003e or a 5-tuple Session Affinity, but not for UDP.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eNEVER_PERSIST\u003c/code\u003e forces existing connections to divert to healthy backends once a backend is unhealthy, whereas \u003ccode\u003eALWAYS_PERSIST\u003c/code\u003e keeps connections on unhealthy backends regardless of the protocol or session affinity.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eUndefinedConnectionPersistenceOnUnhealthyBackends\u003c/code\u003e field indicates that the enum value is unset.\u003c/p\u003e\n"]]],[],null,[]]
