Table of Contents
Configuring 802.1x Authentication
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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:
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Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
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Trunk port—If you try to enable 802.1x authentication on a trunk port, an error message
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appears, and 802.1x authentication is not enabled. If you try to change the mode of an
802.1x-enabled port to trunk, an error message appears, and the port mode is not changed.
Dynamic ports—A port in dynamic mode can negotiate with its neighbor to become a trunk
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port. If you try to enable 802.1x authentication on a dynamic port, an error message appears,
and 802.1x authentication is not enabled. If you try to change the mode of an 802.1x-enabled
port to dynamic, an error message appears, and the port mode is not changed.
Dynamic-access ports—If you try to enable 802.1x authentication on a dynamic-access (VLAN
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Query Protocol [VQP]) port, an error message appears, and 802.1x authentication is not
enabled. If you try to change an 802.1x-enabled port to dynamic VLAN assignment, an error
message appears, and the VLAN configuration is not changed.
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EtherChannel port—Do not configure a port that is an active or a not-yet-active member of an
EtherChannel as an 802.1x port. If you try to enable 802.1x authentication on an EtherChannel
port, an error message appears, and 802.1x authentication is not enabled.
Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN) destination ports—You can
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enable 802.1x authentication on a port that is a SPAN or RSPAN destination port. However,
802.1x authentication is disabled until the port is removed as a SPAN or RSPAN destination
port. You can enable 802.1x authentication on a SPAN or RSPAN source port.
Before globally enabling 802.1x authentication on a switch by entering the dot1x
system-auth-control global configuration command, remove the EtherChannel configuration from
the interfaces on which 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.
Cisco IOS Release 12.2(55)SE and later supports filtering of system messages related to 802.1x
authentication. See the
"Authentication Manager CLI Commands" section on page
When 802.1x authentication is enabled on a port, you cannot configure a port VLAN that is equal
to a voice VLAN.
The 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 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
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.
Chapter 9
Configuring IEEE 802.1x Port-Based Authentication
9-9.
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