Chapter 8
| Authentication Commands
802.1X Port Authentication
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Example
Console(config)#interface eth 1/2
Console(config-if)#dot1x max-req 2
Console(config-if)#
dot1x
operation-mode
This command allows hosts (clients) to connect to an 802.1X-authorized port. Use
the no form with no keywords to restore the default to single host. Use the no form
with the multi-host max-count keywords to restore the default maximum count.
Syntax
dot1x operation-mode {single-host | multi-host [max-count count] | mac-
based-auth}
no dot1x operation-mode [multi-host max-count]
single-host – Allows only a single host to connect to this port.
multi-host – Allows multiple host to connect to this port.
max-count – Keyword for the maximum number of hosts.
count – The maximum number of hosts that can connect to a port.
(Range: 1-1024; Default: 5)
mac-based – Allows multiple hosts to connect to this port, with each host
needing to be authenticated.
Default
Single-host
Command Mode
Interface Configuration
Command Usage
◆ The “max-count” parameter specified by this command is only effective if the
dot1x mode is set to “auto” by the dot1x port-control command.
◆ In “multi-host” mode, only one host connected to a port needs to pass
authentication for all other hosts to be granted network access. Similarly, a port
can become unauthorized for all hosts if one attached host fails re-
authentication or sends an EAPOL logoff message.
◆ In “mac-based-auth” mode, each host connected to a port needs to pass
authentication. The number of hosts allowed access to a port operating in this
mode is limited only by the available space in the secure address table (i.e., up
to 1024 addresses).
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