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Cisco Catalyst Switch Module 3110 and 3012 for IBM BladeCenter Software Configuration Guide
OL-12189-01
Chapter 9 Configuring IEEE 802.1x Port-Based Authentication
Configuring IEEE 802.1x Authentication
You also need to configure some settings on the RADIUS server. These settings include the IP address
of the switch and the key string to be shared by both the server and the switch. For more information,
see the RADIUS server documentation.
Configuring the Host Mode
Beginning in privileged EXEC mode, follow these steps to allow multiple hosts (clients) on an
IEEE 802.1x-authorized port that has the dot1x port-control interface configuration command set to
auto. Use the multi-domain keyword to configure and enable multidomain authentication (MDA),
which allows 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
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
interface interface-id Specify the port to which multiple hosts are indirectly attached, and enter
interface configuration mode.
Step 3
dot1x host-mode {multi-host |
multi-domain}
Allow multiple hosts (clients) on an IEEE 802.1x-authorized port.
The keywords have these meanings:
• 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 14, “Configuring Voice VLAN.”
Make sure that the dot1x port-control interface configuration command
set is set to auto for the specified interface.
Step 4
end Return to privileged EXEC mode.
Step 5
show dot1x interface interface-id Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.