Cisco 2950 Software Configuration Guide - Page 226
Using 802.1x with Guest VLAN
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Understanding 802.1x Port-Based Authentication Chapter 10 Configuring 802.1x Port-Based Authentication • If an 802.1x port is authenticated and put in the RADIUS server assigned VLAN, any change to the port access VLAN configuration does not take effect. • The 802.1x with VLAN assignment feature is not supported on trunk ports, dynamic ports, or with dynamic-access port assignment through a VLAN Membership Policy Server (VMPS). To configure VLAN assignment you need to perform these tasks: • Enable AAA authorization. • Enable 802.1x (the VLAN assignment feature is automatically enabled when you configure 802.1x on an access port). • Assign vendor-specific tunnel attributes in the RADIUS server. The RADIUS server must return these attributes to the switch: - [64] Tunnel-Type = VLAN - [65] Tunnel-Medium-Type = 802 - [81] Tunnel-Private-Group-ID = VLAN name or VLAN ID Attribute [64] must contain the value VLAN (type 13). Attribute [65] must contain the value 802 (type 6). Attribute [81] specifies the VLAN name or VLAN ID assigned to the 802.1x-authenticated user. For examples of tunnel attributes, see the "Configuring the Switch to Use Vendor-Specific RADIUS Attributes" section on page 9-29. Using 802.1x with Guest VLAN For switches running the EI, you can configure a guest VLAN for each 802.1x port on the switch to provide limited services to clients (for example, how to download the 802.1x client). These clients might be upgrading their system for 802.1x authentication, and some hosts, such as Windows 98 systems, might not be 802.1x-capable. If an 802.1x port is configured, the switch assigns clients to a guest VLAN for the 802.1x port when one of these situations occurs: • The authentication server does not receive a response to its EAPOL request/identity frame. • 802.1x EAPOL packets are not sent by the client. • New 802.1x EAPOL packets are sent by the client, but authentication fails. Any number of hosts are allowed access when the switch port is moved to the guest VLAN. If an 802.1x-capable host joins the same port on which the guest VLAN is configured, the port is put into the unauthorized state in the user-configured access VLAN, and authentication is restarted. Any number of hosts are allowed access once the switch port is moved to the guest VLAN. If an 802.1x-capable host joins the same port on which the guest VLAN is configured, the port is put into the unauthorized state in the user-configured access VLAN, and authentication is restarted. Guest VLANs are supported on 802.1x ports in single-host and multiple-hosts modes. You can configure any VLAN, except RSPAN VLANs or voice VLAN IDs (VVIDs), as an 802.1x guest VLAN. The guest VLAN feature is not supported on trunk ports; it is supported only on access ports. For configuration steps, see the "Configuring a Guest VLAN" section on page 10-18. 10-8 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10
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