Vendor Field Area Networks (FANs) have deployed millions of Connected Grid Mesh (which, for convenience, may be referred to herein as ‘CG-Mesh’) devices. Now, customers strongly desire to upgrade all of their CG-Mesh devices to a Wireless Smart Utility Network (Wi-SUN) mode. However, those customers want to accomplish such an upgrade without downtime. To address such a challenge, techniques are presented herein that support a novel method for smooth mode-switching for existing nodes in a large-scale deployment based on an improved depth-first traversal approach. By employing aspects of the presented techniques, a customer may easily and safely switch the working mode of deployed devices. Additionally, aspects of the presented techniques support a recovery mechanism for when a failed case arises where the trouble nodes may automatically roll back to a previous mode or be re-configured. Further, aspects of the presented techniques may be leveraged to facilitate a large firmware version transition in different types of Low-power and Lossy Networks (LLNs) such as, for example, Internet Protocol version 6 (IPv6) over time slotted channel hopping (TSCH)(i.e., 6TiSCH), Wi-Fi mesh, etc.
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Dong, Harbor; Zhang, Lele; Li, Chuanwei; and Zhao, Li, "SMOOTH MODE SWITCHING WITHOUT DOWNTIME IN LOW-POWER AND LOSSY NETWORKS", Technical Disclosure Commons, (September 13, 2021)