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5. Web Management: Monitor of IGR-842POE
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AirLive IGR-842POE User Manual
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
MAC address is converted to a string on the following form "xx-xx-xx-xx-xx-xx",
that is, a dash (-) is used as separator between the lower-cased hexadecimal
digits. The switch only supports the
MD5-Challenge authentication method, so the
RADIUS server must be configured accordingly.
When authentication is complete, the RADIUS server sends a success or failure
indication, which in turn causes the switch to open up or block traffic for that
particular client, using the
Port Security module. Only then will frames from the
client be forwarded on the switch. There are no EAPOL frames involved in this
authentication, and therefore, MAC-based Authentication has nothing to do with
the 802.1X standard.
The advantage of MAC-based authentication over 802.1X-based authentication is
that the clients don't need special supplicant software to authenticate. The
disadvantage is that MAC addresses can be spoofed by malicious users –
equipment whose MAC address is a valid RADIUS user can be used by anyone.
Also, only theMD5-Challenge method is supported. The maximum number of
clients that can be attached to a port can be limited using the
Port Security Limit
Control functionality.
3. RADIUs-Assigned QoS Enabled :
When RADIUS-Assigned QoS is both globally enabled and enabled (checked) on
a given port, the switch reacts to QoS Class information carried in the RADIUS
Access-Accept packet transmitted by the RADIUS server when a supplicant is
successfully authenticated. If present and valid, traffic received on the supplicant's
port will be classified to the given QoS Class. If (re-)authentication fails or the
RADIUS Access-Accept packet no longer carries a QoS Class or it's invalid, or the
supplicant is otherwise no longer present on the port, the port's QoS Class is
immediately reverted to the original QoS Class (which may be changed by the
administrator in the meanwhile without affecting the RADIUS-assigned).
This option is only available for single-client modes, i.e.
•
Port-based 802.1X
• Single 802.1X