AirMesh only allows maximum one wireless link between two nodes, and doesn't support radio bundling.
The node/link redundancy pretection is achieved via routing topology, like the triangle topology below:
MSR2K-1(radio 0)~~~~~~~~~~~~~~~~~~~~~~~~~~(radio0)MSR2K-2
(radio 1)~~~~~~~~~~(radio 0)MSR2K-3(radio 1)~~~~~~~~~~(radio 1)
Since AirMesh runs layer3 routing protocol (AWR), if the primary link between MSR2K-1 and MSR2K-2 fails, the traffic can be quickly switched to the backup MSR2K-1---MSR2K-3---MSR2K-2 path within a second.