RADIUS Authentication, Authorization, and Accounting
Cached Reauthentication
Cached Reauthentication
Cached reauthentication allows 802.1X, web, or MAC reauthentications to
succeed when the RADIUS server is unavailable. Users already authenticated
retain their currently-assigned RADIUS attributes. Uninterrupted service is
provided for authenticated users with RADIUS-assigned VLANS if the RADIUS
server becomes temporarily unavailable during periodic reauthentications.
Cached reauthentication is similar to the authorized authentication method
in that user credentials are not checked. Any user credentials are valid even
if they are different from those used during the last successful authentication
of the same session. However, cached reauthentication maintains the current
session attributes, unlike the authorized authentication method. New authen-
tications are not allowed. The RADIUS server can be the only allowed source
of session attributes for authenticated users.
Reauthentications are not disabled when the RADIUS server is unavailable.
The switch initiates reauthentications of clients at the specified period and
the clients must comply with the requirements for the reauthentication pro-
cedure exactly as is done for the authorized authentication method.
The table below summarizes the differences between the authorized method
and the cached reauthentication method.
Authorized Cached Reauthentication
New authentications are allowed when RADIUS server is New authentications are not allowed when RADIUS server
unreachable. is unreachable.
All previously RADIUS-assigned attributes are voided All previously assigned attributes remain in effect on reau-
and replaced by switch-configured values on reauthen- thentication when RADIUS server is unreachable.
tication when RADIUS server is unreachable.
Cached reauthentication is supported for 802.1X, Web authentication, and
MAC authentication. For more information about Web/MAC authentication,
see “Web and MAC Authentication” in the Access Security Guide for your
switch. For more information on 802.1X, see “Configuring Port-Based and
User-Based Access Control (802.1X) in the Access Security Guide for your
switch.
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