"The recommended load-balancing method for Catalyst switches is src-dest-ip (CLI command: port-channel load-balance src_dest_ip)."
LAG on 5508 and 2504 (2504 LAG Support introduced in 7.4 code) WLC's does not require src-dst-ip. Any load balacing method will work.
With 6500's running in pfc3 mode, the channel load balance method is 'src-dst-ip enhanced' or 'src-dst-ip vlan included' by default, which will often cause packet forwarding problems with WiSM controllers (referenced in the link above).
6500's pfc mode can be verified with this command:
6500#show platform hardware pfc mode
PFC operating mode : PFC3A
The ability to revert to 'src-dst-ip' only was not originally in 6500 code.
This was added as an enhancement in 12.2(33)SXH6 and 12.2(33)SXI3 as documented in the following enhancement bug: