ProCurve 6200yl User's Guide Page 479

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13-27
Configuring Port-Based and User-Based Access Control (802.1X)
802.1X Open VLAN Mode
The 802.1X Open VLAN mode solves this problem by temporarily suspending
the port’s static VLAN memberships and placing the port in a designated
Unauthorized-Client VLAN (sometimes termed a guest VLAN). In this state
the client can proceed with initialization services, such as acquiring IP
addressing and 802.1X client software, and starting the authentication
process.
Note On ports configured to allow multiple sessions using 802.1X user-based access
control, all clients must use the same untagged VLAN. On a given port where
there are no currently active, authenticated clients, the first authenticated
client determines the untagged VLAN in which the port will operate for all
subsequent, overlapping client sessions.
If the switch operates in an environment where some valid clients will not be
running 802.1X supplicant software and need to download it from your
network. Then, because such clients would need to use the Unauthorized-
Client VLAN and authenticated clients would be using a different VLAN (for
security reasons), allowing multiple clients on an 802.1X port can result in
blocking some or all clients needing to use the Unauthorized-Client VLAN.
On ports configured for port-based 802.1X access control, if multiple clients
try to authenticate on the same port, the most recently authenticated client
determines the untagged VLAN membership for that port. Clients that connect
without trying to authenticate will have access to the untagged VLAN mem-
bership that is currently assigned to the port.
VLAN Membership Priorities
Following client authentication, an 802.1X port resumes membership in any
tagged VLANs for which it is already assigned in the switch configuration. The
port also becomes an untagged member of one VLAN according to the follow-
ing order of options:
a. 1st Priority: The port joins a VLAN to which it has been assigned by
a RADIUS server during client authentication.
b. 2nd Priority: If RADIUS authentication does not include assigning
the port to a VLAN, then the switch assigns the port to the VLAN
entered in the port’s 802.1X configuration as an Authorized-Client
VLAN, if configured.
c. 3rd Priority: If the port does not have an Authorized-Client VLAN
configured, but does have a static, untagged VLAN membership in its
configuration, then the switch assigns the port to this VLAN.
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