The diagnostic code specifies the local system's reason for the last change in session state. This allows remote systems to determine the reason that the previous session failed, for example. These diagnostic codes are specified in section 4.1 of RFC5880
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-08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\u003eThe latest version available for \u003ccode\u003eGoogle.Cloud.Compute.V1.BfdStatus.Types.LocalDiagnostic\u003c/code\u003e is 3.6.0, with numerous earlier versions also accessible, ranging back to version 1.0.0.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eLocalDiagnostic\u003c/code\u003e is an enum within the \u003ccode\u003eGoogle.Cloud.Compute.V1\u003c/code\u003e namespace and it specifies the reason for the last change in session state, according to RFC5880 section 4.1.\u003c/p\u003e\n"],["\u003cp\u003eThe available fields for \u003ccode\u003eLocalDiagnostic\u003c/code\u003e include various diagnostic codes such as \u003ccode\u003eAdministrativelyDown\u003c/code\u003e, \u003ccode\u003eControlDetectionTimeExpired\u003c/code\u003e, \u003ccode\u003eEchoFunctionFailed\u003c/code\u003e, and \u003ccode\u003eNoDiagnostic\u003c/code\u003e, among others.\u003c/p\u003e\n"],["\u003cp\u003eThere is an additional field available called \u003ccode\u003eUndefinedLocalDiagnostic\u003c/code\u003e, which indicates when the field is not set.\u003c/p\u003e\n"]]],[],null,[]]