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Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
Chapter 10 Configuring IEEE 802.1x Port-Based Authentication
Configuring IEEE 802.1x Authentication
Configuring the Host Mode
Beginning in privileged EXEC mode, follow these steps to allow a single host (client) on an
IEEE 802.1x-authorized port. Use the multi-domain keyword to configure multidomain authentication
(MDA) to enable authentication of both a host and a voice device, such as an IP phone (Cisco or
non-Cisco) on the same switch port. This procedure is optional.
To disable multiple hosts on the port, use the no dot1x host-mode multi-host interface configuration
command.
This example shows how to enable IEEE 802.1x authentication and to allow multiple hosts:
Switch(config)# interface gigabitethernet2/0/1
Switch(config-if)# dot1x port-control auto
Switch(config-if)# dot1x host-mode multi-host
Switch(config-if)# end
This example shows how to enable MDA and to allow both a host and a voice device on the port:
Switch(config)# interface gigabitethernet3/0/1
Switch(config-if)# dot1x port-control auto
Switch(config-if)# dot1x host-mode multi-domain
Switch(config-if)# switchport voice vlan 101
Switch(config-if)# end
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
radius-server vsa send authentication Configure the network access server to recognize and use vendor-specific
attributes (VSAs).
Step 3
interface interface-id Specify the port to which multiple hosts are indirectly attached, and enter
interface configuration mode.
Step 4
dot1x host-mode {single-host |
multi-host | multi-domain}
The keywords have these meanings:
• single-host–Allow a single host (client) on an
IEEE 802.1x-authorized port.
• multi-host–Allow multiple hosts on an IEEE 802.1x-authorized port
after a single host has been authenticated.
• multi-domain–Allow both a host and a voice device, such as an IP
phone (Cisco or non-Cisco), to be authenticated on an
IEEE 802.1x-authorized port.
Note You must configure the voice VLAN for the IP phone when the
host mode is set to multi-domain. For more information, see
Chapter 15, “Configuring Voice VLAN.”
Make sure that the dot1x port-control interface configuration command
set is set to auto for the specified interface.
Step 5
switchport voice vlan vlan-id (Optional) Configure the voice VLAN.
Step 6
end Return to privileged EXEC mode.
Step 7
show dot1x interface interface-id Verify your entries.
Step 8
copy running-config startup-config (Optional) Save your entries in the configuration file.
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