Dell PowerConnect B-RX - Authentication-Failure Actions; Dynamic VLAN and ACL Assignments; Supported RADIUS Attributes

926 BigIron RX Series Configuration Guide
53-1002253-01
How multi-device port authentication works
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Authentication-failure actions
If the MAC address does not match the username and password of an entry in the users database
on the RADIUS server, then the RADIUS server returns an Access-Reject message. When this
happens, it is considered an authentication failure for the MAC address. When an authentication
failure occurs, the device can either drop traffic from the MAC address in hardware (the default), or
move the port on which the traffic was received to a restricted VLAN.
BigIron RX Series support multi-device port authentication on both tagged and untagged ports.
Supported RADIUS attributes
The BigIron RX supports the following RADIUS attributes for multi-device port authentication:
• Username (1) – RFC 2865
• FilterId (11) – RFC 2865
• Vendor-Specific Attributes (26) – RFC 2865
• Tunnel-Type (64) – RFC 2868
• Tunnel-Medium-Type (65) – RFC 2868
• EAP Message (79) – RFC 2579
• Tunnel-Private-Group-Id (81) – RFC 2868
Dynamic VLAN and ACL assignments
The multi-device port authentication feature supports dynamic VLAN assignment, where a port can
be placed in a VLAN based on the MAC address learned on that interface. When a MAC address is
successfully authenticated, the RADIUS server sends the device a RADIUS Access-Accept message
that allows the device to forward traffic from that MAC address. The RADIUS Access-Accept
message can also contain attributes set for the MAC address in its access profile on the RADIUS
server.
If one of the attributes in the Access-Accept message specifies a VLAN identifier, and this VLAN is
available on the device, the port is moved from its default VLAN to the specified VLAN.
To enable dynamic VLAN assignment for authenticated MAC addresses, you must add the following
attributes to the profile for the MAC address on the RADIUS server. Dynamic VLAN assignment on
multi-device port authentication-enabled interfaces is enabled by default.
In addition to dynamic VLAN assignment, BigIron RX Series also support dynamic ACL assignment
as is the case with 802.1x port security.
Attribute name Type Value
Tunnel-Type 064 13 (decimal) – VLAN
Tunnel-Medium-Type 065 6 (decimal) – 802
Tunnel-Private-Group-ID 081 <vlan-name> (string) – either the name or the number of a
VLAN configured on the device.