Reference documentation and code samples for the Compute Engine v1 API enum BackendServiceConnectionTrackingPolicy.Types.ConnectionPersistenceOnUnhealthyBackends.
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"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-04-01 UTC."],[[["This document provides reference documentation for the `BackendServiceConnectionTrackingPolicy.Types.ConnectionPersistenceOnUnhealthyBackends` enum within the Compute Engine v1 API."],["The latest version of the API available in this content is 3.6.0, while the current page being viewed is version 2.9.0, and it includes a comprehensive list of prior versions dating back to 1.0.0."],["The enum specifies how connection persistence is handled when backends become unhealthy, with options including `DefaultForProtocol`, `NeverPersist`, and `AlwaysPersist`."],["The `DefaultForProtocol` setting allows for existing connections to persist on unhealthy backends only for TCP and SCTP protocols in certain tracking modes, while `NeverPersist` diverts connections from unhealthy backends, and `AlwaysPersist` maintains connections on unhealthy backends regardless of the protocol."],["The `UndefinedConnectionPersistenceOnUnhealthyBackends` field indicates when an enum value is not set, and the `Google.Cloud.Compute.V1.dll` assembly is associated with this API."]]],[]]
