LevelOne GSW-4876 User Manual

Page 93

HAPTER

| Configuring the Switch

Configuring Security

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RADIUS Attributes Used in Identifying a VLAN ID
RFC 2868 and RFC 3580 form the basis for the attributes used in

identifying a VLAN ID in an Access-Accept packet. The following criteria

are used:

■

The Tunnel-Medium-Type, Tunnel-Type, and Tunnel-Private-Group-

ID attributes must all be present at least once in the Access-Accept

packet.

■

The switch looks for the first set of these attributes that have the

same Tag value and fulfil the following requirements (if Tag == 0 is

used, the Tunnel-Private-Group-ID does not need to include a Tag):

■

Value of Tunnel-Medium-Type must be set to “IEEE-802” (ordinal
6).

■

Value of Tunnel-Type must be set to “VLAN” (ordinal 13).

■

Value of Tunnel-Private-Group-ID must be a string of ASCII

characters in the range 0-9, which is interpreted as a decimal

string representing the VLAN ID. Leading '0's are discarded. The

final value must be in the range 1-4095.
The VLAN list can contain multiple VLAN identifiers in the format

“1u,2t,3u” where “u” indicates an untagged VLAN and “t” a

tagged VLAN.

◆

Guest VLAN Enabled - A Guest VLAN is a special VLAN - typically with

limited network access - on which 802.1X-unaware clients are placed

after a network administrator-defined timeout. The switch follows a set

of rules for entering and leaving the Guest VLAN as listed below.
The “Guest VLAN Enabled” checkbox provides a quick way to globally

enable/disable Guest VLAN functionality. When checked, the individual

port settings determine whether the port can be moved into Guest

VLAN. When unchecked, the ability to move to the Guest VLAN is

disabled for all ports.
When Guest VLAN is both globally enabled and enabled for a given

port, the switch considers moving the port into the Guest VLAN

according to the rules outlined below. This option is only available for

EAPOL-based modes, i.e. Port-based 802.1X, Single 802.1X, and Multi

802.1X

OTE

For trouble-shooting VLAN assignments, use the Monitor > VLANs >

VLAN Membership and VLAN Port pages. These pages show which modules

have (temporarily) overridden the current Port VLAN configuration.

Guest VLAN Operation
When a Guest VLAN enabled port's link comes up, the switch starts

transmitting EAPOL Request Identity frames. If the number of

transmissions of such frames exceeds Max. Reauth. Count and no

EAPOL frames have been received in the meanwhile, the switch

considers entering the Guest VLAN. The interval between transmission

of EAPOL Request Identity frames is configured with EAPOL Timeout. If

Allow Guest VLAN if EAPOL Seen is enabled, the port will now be placed