I just bought two Wireless Wire Cube Pros for my research testbed. What I want to set up is X–>Router 1 - - - - Router 2–>Y. Here Router 1 and 2 are Cube Pros, and they default IP is 192.168.88.2 and 192.168.88.3. Correspondingly, I set IP of X and Y as 192.168.88.20 and 192.168.88.30. The connection between X to Router 1 and between Y to Router 2 is through ethernet cables. The connection between Router 1 and Router 2 is established automatically.
On X, I tried test the connection between X and Y through “ping”, i.e., on 192.168.88.20, ping 192.168.88.30, but it failed. However, I can successfully establish the connection between X to Router 2 and Y to Router 1.
Also, I tried to disable 5 GHz by disabling the bond and reconfigure the bridge of bond and ethernet inferface. It failed either.
The default configuration of a set of Cube Pro’s (wireless wire) is that of a “transparent” bridge, it should (and it does normally) work without any change.
There is normally no routing happening, so calling them “routers” is a bit confusing, you should consider them essentially as switches or bridges.
It would be easier - I believe - if you start again from scratch and verify that the device work normally (with the backup 5 GHz connection enabled and without any other modification) and only once that is verified start fiddling with the bonding.
Otherwise, use this post instructions: http://forum.mikrotik.com/t/forum-rules/173010/1
and post your current configuration (for both devices), it is possible that someone can spot where the problem lies.
Sometimes (actually often with Mikrotik configurations) the devil is in the details.