This can work but it requires configuration on the IAP225. I would recommend doing the following first:
1. Disable the preferred master setting on the IAP225.
2. Bring up the IAP225 in a separate VLAN with only e0 connected, get access to the IAP225 UI or CLI through the ?instant? SSID
3. Upgrade the IAP225 to 4.0.0.4 by downloading the image from the Aruba support site
4. Upgrade the IAP105s to 4.0.0.4 as well
5. Connect the IAP225 still with only eth0 connected, to the IAP105 VLANs, they should be able to become a single cluster now
After this is working properly, refer to the section ?Uplink management? in the user guide, to configure eth0 and eth1 in redundancy mode. Plug eth1 to the switch after the configuration is complete.
Regarding the redundancy configuration, we can also provide more assistance if needed. However it would be good to first stabilize the cluster with the above steps first.
Thanks,
Yan