Hi Charles,
I was hoping that a member of the public would answer your post.
If I recall correctly, clustering is controlled via the copper Ethernet ports, so that any AP that can communicate in the same VLAN can be clustered together. Up to 10 AP's can be in a cluster.
It uses a encrypted proprietary protocol so that clustered APs "talk" to eachother.
AP's are in the same cluster if they satisfy the following requirements'
- in the same vlan
- the same cluster name and
- location assisgned.
Once clustering is enabled, a configuration change on one AP is propogated to all AP's in the cluster.
If you are a Cisco partner, you can check out a AP541 emulator at the following location so you can check out the management interface.
https://supportforums.cisco.com/community/netpro/small-business/onlinedemos?view=overview%20target=
I have attached the WiFi old deployment guide that specifically looks at the deployment of AP541.
Hope you find it informative.
regards Dave