Tagged and untagged VLAN attributes

When you configure a user profile on a RADIUS server to assign a VLAN to an authenticated client, you can use either the VLAN name or VLAN ID (VID) number. For example, if a VLAN configured in the switch has a VID of 100 and is named vlan100, you could configure the RADIUS server to use either "100" or "vlan100" to specify the VLAN.

After the RADIUS server validates a client user name and password, the RADIUS server returns an Access-Accept packet that contains the VLAN assignment and the following attributes for use in the authentication session:
  • Egress-VLANID: Configures an optional, egress VLAN ID for either tagged or untagged packets (RFC 4675).

  • Egress-VLAN-Name: Configures an optional, egress VLAN for either tagged or untagged packets when the VLAN ID is not known (RFC 4675).

  • Tunnel-Type, Tunnel-Medium-Type, and Tunnel-Private-Group-ID: Tunnel attributes that specify an untagged VLAN assignment (RFC 3580).Tunnel (untagged VLAN) attributes may be included in the same RADIUS packet as the Egress-VLANID and Egress-VLAN-Name attributes. These attributes are not mutually exclusive.

The switch processes the VLAN information returned from the remote RADIUS server for each successfully 802.1X-, web-based, and MAC authenticated client (user). The VLAN information is part of the user profile stored in the RADIUS server database and is applied if the VLANs exist on the switch.

The support for RADIUS-assigned tagged and untagged VLAN configuration on an authenticated port allows you to dynamically configure tagged and untagged VLANs as required for different client devices, such as PCs and IP phones, that share a switch port.