RFC6775 defines route-over topology as "A topology where hosts are connected to the 6LBR through the use of intermediate layer-3 (IP) routing. Here, hosts are typically multiple IP hops away from a 6LBR."

RFC8138 states that "This is usually not the case in a RPL network, which is generally a multi-hop route-over (i.e., operated at Layer 3) network."

RFC6550 (the RPL standard) states that "RPL also introduces the capability to bind a subnet together with a common prefix and to route within that subnet."

Finally, RFC4919 states that "[m]esh topologies imply multi-hop routing, to a desired destination. In this case, intermediate devices act as packet forwarders at the link layer (akin to routers at the network layer)."

While RFC4919 and RFC6550 cohere, RFC6775 makes an incongruous claim. Indeed, nodes in a RPL instance DODAG are one IP hop away from one another. RFC8138, taken inconjunction with RFC6775, makes the same claim. The root discord however, is between:

(a) on one hand: RFC6550, and

(b) on the other hand: RFC6775,

where the former binds nodes in a DODAG into the confines of a single IPv6 prefix (hence one IP hop)

while the latter claims that route-over topologies (as, presumably, are created by route-over protocols like RPL), are multiple IP hops away from a 6LBR.