Generating cross-pan bypass path based on stitching between border LLN devices

An apparatus implemented as a physical machine, the apparatus comprising:

• non-transitory machine readable media configured for storing executable machine readable code;
• a device interface circuit configured for receiving a data packet via a low power and lossy network (LLN);
• and
• a processor circuit configured for executing the machine readable code, and when executing the machine readable code operable for:
• determining, by the apparatus implemented as a controller device in the LLN, that a first LLN border device is in a first personal area network (PAN) having a first directed acyclic graph (DAG) topology in the LLN, and that the first LLN border device is a neighbor of a second LLN border device in a second PAN of the LLN, the second PAN having a second DAG topology,
• receiving a path request for a third LLN device in the first PAN to reach a fourth LLN device,
• determining that the fourth LLN device is in the second PAN,
• generating an inter-PAN path between the third LLN device and the fourth LLN device via the first and second LLN border devices, the inter-PAN path providing a stitching between the first DAG topology and the second DAG topology, and
• causing the inter-PAN path to be deployed between the third LLN device and the fourth LLN device.

One or more non-transitory tangible media encoded with logic for execution by a machine and when executed by the machine operable for:

• determining, by the machine implemented as a controller device in a low power and lossy network (LLN), that a first LLN border device is in a first personal area network (PAN) having a first directed acyclic graph (DAG) topology in the LLN, and that the first LLN border device is a neighbor of a second LLN border device in a second PAN of the LLN, the second PAN having a second DAG topology;
• receiving a path request for a third LLN device in the first PAN to reach a fourth LLN device;
• determining that the fourth LLN device is in the second PAN;
• generating an inter-PAN path between the third LLN device and the fourth LLN device via the first and second LLN border devices, the inter-PAN path providing a stitching between the first DAG topology and the second DAG topology;
• and
• causing the inter-PAN path to be deployed between the third LLN device and the fourth LLN device.