No I do not have that enabled. Does this make a big impact on Mac's connecting to the network?
This didn't scream Apple to me, does this have an impact on the rest of the network as well? We only have maybe 600 clients active on a busy day, so I assume we could handle the added load, but I would hate to see issues come up with other computers because of this.
Here is the description of the setting for anyone who may also be looking to figure this out:
Validate PMKID: This parameter instructs the controller to check the pairwise master key (PMK) ID
sent by the client. When you enable this option, the client must send a PMKID in the
associate or reassociate frame to indicate that it supports OKC or PMK caching;
otherwise, full 802.1x authentication takes place.
NOTE: This feature is optional, since most clients that support OKC and PMK
caching do not send the PMKID in their association request.