Automatic rerouting in thread networks

1. A method of rerouting a packet in a mesh network, the method comprising:

receiving, by a backbone router connected to the mesh network, a message from a router in the mesh network requesting an address query across other mesh networks connected to a backbone network, the message including an Endpoint Identifier (EID) of a destination node for the packet;

transmitting the address query to other backbone routers connected to the backbone network, the address query including the EID of the destination node;

receiving, from at least one of the other backbone routers, an EID-to-Routing Locator (RLOC) mapping for the EID; and

transmitting the received EID-to-RLOC mapping to the router, the transmitting configuring the router to forward the packet to the destination node using the received EID-to-RLOC mapping.

2. The method of claim 1 , further comprising:

updating, by the backbone router, a cache of EID-to-RLOC mappings stored by the backbone router to include the received EID-to-RLOC mapping.

3. The method of claim 2 , further comprising:

updating, by the backbone router, the cache of EID-to-RLOC mappings by opportunistically obtaining EID-to-RLOC mappings by observing mesh network traffic or backbone network traffic routed through the backbone router.

4. The method of claim 1 , further comprising:

receiving, by the backbone router, the packet comprising a destination address including the RLOC included in the received EID-to-RLOC mapping; and

forwarding, using the destination address, the packet to another backbone router.

5. The method of claim 1 , further comprising:

receiving, by the backbone router, an address notification message including the received EID-to-RLOC mapping; and

forwarding the address notification message to a source node that transmitted the packet.

6. The method of claim 5 , wherein the source node is a cloud service.

7. The method of claim 1 , wherein the transmitting the address query to other backbone routers connected to the backbone network is effective to cause each of the other backbone routers to:

search, based on the address query, a respective cache of EID-to-RLOC mappings stored in each of the other backbone routers; or

transmit the address query to nodes in a respective mesh network connected to each of the other backbone routers.

8. The method of claim 1 , further comprising:

receiving, by the backbone router and via to the backbone network, another address query from one of the other backbone routers, the other address query including another EID;

searching, based on the other address query, a cache of EID-to-RLOC mappings stored in the backbone router; and

if an EID-to-RLOC mapping for the other address query is found in the cache, transmitting the found EID-to-RLOC mapping for the other address query across the backbone network; or

if the EID-to-RLOC mapping for the other address query is not found in the cache, transmitting the other address query to nodes in the mesh network.

9. A mesh network device implemented as a backbone router device, the backbone router device comprising:

a mesh network interface configured for communication in a mesh network;

a backbone network interface configured for communication with other backbone routers in a backbone network, each of the other backbone routers being connected to a respective other mesh network; and

a memory and processor system to implement an application that is configured to:

receive, using the mesh network interface, a message from a router in the mesh network requesting an address query across the other mesh networks, the message including an Endpoint Identifier (EID) of a destination node for a packet;

transmit, using the backbone network interface, the address query to the other backbone routers, the address query including the EID of the destination node;

receive, using the backbone network interface and from at least one of the other backbone routers, an EID-to-Routing Locator (RLOC) mapping for the EID; and

transmit, using the mesh network interface, the received EID-to-RLOC mapping to the router, the transmission configuring the router to forward the packet to the destination node using the received EID-to-RLOC mapping.

10. The mesh network device of claim 9 , wherein the application is configured to update a cache of EID-to-RLOC mappings stored by the backbone router device to include the received EID-to-RLOC mapping.

11. The mesh network device of claim 9 , wherein the application is configured to update a cache of EID-to-RLOC mappings by opportunistically obtaining EID-to-RLOC mappings by observing mesh network traffic or backbone network traffic routed through the backbone router device.

12. The mesh network device of claim 9 , wherein the application is configured to:

receive, using the mesh network interface, the packet comprising a destination address including the RLOC included in the received EID-to-RLOC mapping; and

forward, using the destination address and the backbone network interface, the packet to another backbone router.

13. The mesh network device of claim 9 , wherein the application is configured to:

receive, using the mesh network interface, an address notification message including the received EID-to-RLOC mapping; and

forward the address notification message to a source node that transmitted the packet, wherein the source node is a cloud service.

14. The mesh network device of claim 9 , wherein the transmission of the address query to the other backbone routers is effective to cause each of the other backbone routers to:

search, based on the address query, a respective cache of EID-to-RLOC mappings stored in each of the other backbone routers; or

transmit the address query to nodes in a respective mesh network connected to each of the other backbone routers.

15. The mesh network device of claim 9 , wherein the application is configured to:

receive, using the backbone network interface, another address query from one of the other backbone routers, the other address query including another EID;

search, based on the other address query, a cache of EID-to-RLOC mappings stored in the backbone router device; and

if an EID-to-RLOC mapping for the other address query is found in the cache, transmit, using the backbone network interface, the found EID-to-RLOC mapping for the other address query across the backbone network; or

if the EID-to-RLOC mapping for the other address query is not found in the cache, transmit, using the mesh network interface, the other address query to nodes in the mesh network.

16. A system comprising:

a mesh network including a mesh-network router device;

a backbone router device connected to the mesh network and a backbone network; and

other backbone routers connected to the backbone network and other respective mesh networks;

the backbone router device configured to:

receive, from the mesh-network router device via the mesh network, a message requesting an address query across the other mesh networks, the message including an Endpoint Identifier (EID) of a destination node for a packet;

transmit the address query to the other backbone routers using the backbone network, the address query including the EID of the destination node;

receive, from at least one of the other backbone routers, an EID-to-Routing Locator (RLOC) mapping for the EID; and

transmit the received EID-to-RLOC mapping to the router, the transmission configuring the mesh-network router to forward the packet to the destination node using the received EID-to-RLOC mapping.

17. The system of claim 16 , wherein the other backbone routers are configured to:

search, based on the address query, a respective cache of EID-to-RLOC mappings stored in each of the other backbone routers; or

transmit the address query to nodes in the other respective mesh networks connected to each of the other backbone routers.

18. The system of claim 16 , wherein the backbone router device is configured to:

update a cache of EID-to-RLOC mappings stored by the backbone router device to include the received EID-to-RLOC mapping.

19. The system of claim 16 , wherein the backbone router device is configured to:

receive, via the mesh network, the packet comprising a destination address including the RLOC included in the received EID-to-RLOC mapping; and

forward, using the destination address, the packet to another of the backbone routers.

20. The system of claim 16 , wherein the backbone router device is configured to:

receive, via the backbone network, another address query from one of the other backbone routers, the other address query including another EID;

search, based on the other address query, a cache of EID-to-RLOC mappings stored in the backbone router device; and

if an EID-to-RLOC mapping for the other address query is found in the cache, transmit the found EID-to-RLOC mapping for the other address query across the backbone network; or

if the EID-to-RLOC mapping for the other address query is not found in the cache, transmit the other address query to nodes in the mesh network.