This object applies when WPA is enabled (dot11PrivacyInvoked,
etsysWPAConfigEnabled) and management has chosen to allow a mix
of WPA and non-WPA clients (etsysWPAConfigAllowLegacyClients).
It specifies whether the access point should tumble Pairwise
WEP keys belonging to non-WPA clients. The access point uses
Group key rotation as a trigger for Pairwise WEP key tumbling;
if you want the latter, be sure to configure the former.
See also: etsysDot1xRekeyPairwise.