Planet Networking & Communication MGSW-28240F User Manual page 259

User's Manual of MGSW-MGSD Series
comes up will be the first one considered. If that supplicant doesn't provide valid
credentials within a certain amount of time, another supplicant will get a chance.
Once a supplicant is successfully authenticated, only that supplicant will be
allowed access. This is the most secure of all the supported modes. In this mode,
the Port Security module is used to secure a supplicant's MAC address once
successfully authenticated.
Multi 802.1X
In port-based 802.1X authentication, once a supplicant is successfully
authenticated on a port, the whole port is opened for network traffic. This allows
other clients connected to the port (for instance through a hub) to piggy-back on
the successfully authenticated client and get network access even though they
really aren't authenticated. To overcome this security breach, use the Multi
802.1X variant.
Multi 802.1X is really not an IEEE standard, but features many of the same
characteristics as does port-based 802.1X. Multi 802.1X is - like Single 802.1X -
not an IEEE standard, but a variant that features many of the same
characteristics. In Multi 802.1X, one or more supplicants can get authenticated
on the same port at the same time. Each supplicant is authenticated individually
and secured in the MAC table using the Port Security module.
In Multi 802.1X it is not possible to use the multicast BPDU MAC address as
destination MAC address for EAPOL frames sent from the switch towards the
supplicant, since that would cause all supplicants attached to the port to reply to
requests sent from the switch. Instead, the switch uses the supplicant's MAC
address, which is obtained from the first EAPOL Start or EAPOL Response
Identity frame sent by the supplicant. An exception to this is when no supplicants
are attached. In this case, the switch sends EAPOL Request Identity frames
using the BPDU multicast MAC address as destination - to wake up any
supplicants that might be on the port.
The maximum number of supplicants that can be attached to a port can be
limited using the Port Security Limit Control functionality.
MAC-based Auth.
Unlike port-based 802.1X, MAC-based authentication is not a standard, but
merely a best-practices method adopted by the industry. In MAC-based
authentication, users are called clients, and the switch acts as the supplicant on
behalf of clients. The initial frame (any kind of frame) sent by a client is snooped
by the switch, which in turn uses the client's MAC address as both username and
password in the subsequent EAP exchange with the RADIUS server. The 6-byte
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