Hi VT,

The ISR AP supports both of these roles;

Access Point Link Role Flexibility

Access Point Link Role Flexibility allows access point radios to operate in a combination of radio roles,

such as access point root, bridge root (with or without clients), bridge nonroot (with or without clients).

This provides a more flexible deployment scheme to support the various applications requirement. Note

that the ISR AP does not support access point repeater and WGB.

Wireless Non-Root Bridge

The wireless non-root bridge allows the access point radio to operate as the remote node in a point to

point or point to multi-point network.

Wireless Root Bridge

The wireless root bridge role provides support for both point-to-point or point to multi-point bridging.

http://www.cisco.com/en/US/docs/ios/12_4/12_4x/release/notes/rn1800xj.html

Hope this helps!

Rob