Cisco Systems 3750E manual 10-24

Chapter 10 Configuring IEEE 802.1x Port-Based Authentication

Configuring IEEE 802.1x Authentication

–EtherChannel port—Do not configure a port that is an active or a not-yet-active member of an EtherChannel as an IEEE 802.1x port. If you try to enable IEEE 802.1x authentication on an EtherChannel port, an error message appears, and IEEE 802.1x authentication is not enabled.

–Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN) destination ports—You can enable IEEE 802.1x authentication on a port that is a SPAN or RSPAN destination port. However, IEEE 802.1x authentication is disabled until the port is removed as a SPAN or RSPAN destination port. You can enable IEEE 802.1x authentication on a SPAN or RSPAN source port.

•Before globally enabling IEEE 802.1x authentication on a switch by entering the dot1x system-auth-controlglobal configuration command, remove the EtherChannel configuration from the interfaces on which IEEE 802.1x authentication and EtherChannel are configured.

•If you are using a device running the Cisco Access Control Server (ACS) application for

IEEE 802.1x authentication with EAP-Transparent LAN Services (TLS) and EAP-MD5, make sure that the device is running ACS Version 3.2.1 or later.

VLAN Assignment, Guest VLAN, Restricted VLAN, and Inaccessible Authentication Bypass

These are the configuration guidelines for VLAN assignment, guest VLAN, restricted VLAN, and inaccessible authentication bypass:

•When IEEE 802.1x authentication is enabled on a port, you cannot configure a port VLAN that is equal to a voice VLAN.

•The IEEE 802.1x authentication with VLAN assignment feature is not supported on trunk ports, dynamic ports, or with dynamic-access port assignment through a VMPS.

•You can configure IEEE 802.1x authentication on a private-VLAN port, but do not configure IEEE 802.1x authentication with port security, a voice VLAN, a guest VLAN, a restricted VLAN, or a per-user ACL on private-VLAN ports.

•You can configure any VLAN except an RSPAN VLAN, private VLAN, or a voice VLAN as an IEEE 802.1x guest VLAN. The guest VLAN feature is not supported on internal VLANs (routed ports) or trunk ports; it is supported only on access ports.

•After you configure a guest VLAN for an IEEE 802.1x port to which a DHCP client is connected, you might need to get a host IP address from a DHCP server. You can change the settings for restarting the IEEE 802.1x authentication process on the switch before the DHCP process on the client times out and tries to get a host IP address from the DHCP server. Decrease the settings for the IEEE 802.1x authentication process (dot1x timeout quiet-periodand dot1x timeout tx-periodinterface configuration commands). The amount to decrease the settings depends on the connected IEEE 802.1x client type.

•When configuring the inaccessible authentication bypass feature, follow these guidelines:

–The feature is supported on IEEE 802.1x port in single-host mode and multihosts mode.

–If the client is running Windows XP and the port to which the client is connected is in the critical-authentication state, Windows XP might report that the interface is not authenticated.

–If the Windows XP client is configured for DHCP and has an IP address from the DHCP server, receiving an EAP-Success message on a critical port might not re-initiate the DHCP configuration process.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
10-24	OL-9775-02