Cisco 2975 - Catalyst LAN Base Switch, Руководство по настройке программного обеспечения

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10-35
Catalyst 2975 Switch Software Configuration Guide
OL-19720-02
Chapter 10 Configuring IEEE 802.1x Port-Based Authentication
Configuring 802.1x Authentication
802.1x Authentication Configuration Guidelines
These section has configuration guidelines for these features:
•
802.1x Authentication, page 10-35
• VLAN Assignment, Guest VLAN, Restricted VLAN, and Inaccessible Authentication Bypass,
page 10-36
•
MAC Authentication Bypass, page 10-36
• Maximum Number of Allowed Devices Per Port, page 10-37
802.1x Authentication
•
When IEEE 802.1x authentication is enabled, ports are authenticated before any other Layer 2
feature is enabled.
• If you try to change the mode of an 802.1x-enabled port (for example, from access to trunk), an error
message appears, and the port mode is not changed.
•
If the VLAN to which an 802.1x-enabled port is assigned changes, this change is transparent and
does not affect the switch. For example, this change occurs if a port is assigned to a RADIUS
server-assigned VLAN and is then assigned to a different VLAN after re-authentication.
If the VLAN to which an 802.1x port is assigned to shut down, disabled, or removed, the port
becomes unauthorized. For example, the port is unauthorized after the access VLAN to which a port
is assigned shuts down or is removed.
•
The IEEE 802.1x protocol is supported on Layer 2 static-access ports and voice VLAN ports, but it
is not supported on these port types:
–
Trunk port—If you try to enable 802.1x authentication on a trunk 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 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
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
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.
–
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
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.
•
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 10-9 .