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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 10 Configuring 802.1x Port-Based Authentication
Configuring 802.1x Authentication
802.1x Configuration Guidelines
These are the 802.1x authentication configuration guidelines:
• When 802.1x is enabled, ports are authenticated before any other Layer 2 features are enabled.
• The 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 on a trunk port, an error message appears, and 802.1x
is not enabled. If you try to change the mode of an 802.1x-enabled port to trunk, 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 on a dynamic port, an error message appears, and 802.1x is not
enabled. If you try to change the mode of an 802.1x-enabled port to dynamic, the port mode is
not changed.
–
Dynamic-access ports—If you try to enable 802.1x on a dynamic-access (VLAN Query
Protocol [VQP]) port, an error message appears, and 802.1x 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 ports—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 on an EtherChannel port, an error
message appears, and 802.1x is not enabled.
Quiet period 60 seconds (number of seconds that the switch remains in
the quiet state following a failed authentication exchange
with the client).
Retransmission time 30 seconds (number of seconds that the switch should
wait for a response to an EAP request/identity frame
from the client before resending the request).
Maximum retransmission number 2 times (number of times that the switch will send an
EAP-request/identity frame before restarting the
authentication process).
Host mode Single-host mode.
Guest VLAN None specified.
Client timeout period 30 seconds (when relaying a request from the
authentication server to the client, the amount of time the
switch waits for a response before resending the request
to the client.
Authentication server timeout period 30 seconds (when relaying a response from the client to
the authentication server, the amount of time the switch
waits for a reply before resending the response to the
server. This setting is not configurable.)
Table 10-1 Default 802.1x Configuration (continued)
Feature Default Setting