Configuring The Host Mode - Cisco Catalyst 3750 Software Configuration Manual

Chapter 8 Configuring 802.1x Port-Based Authentication

Configuring the Host Mode

You can configure an 802.1x port for single-host or for multiple-hosts mode. In single-host mode, only
one host is allowed on an 802.1x port. When the host is authenticated, the port is placed in the authorized
state. When the host leaves the port, the port becomes unauthorized. Packets from hosts other than the
authenticated one are dropped.
You can attach multiple hosts to a single 802.1x-enabled port as shown in
mode, only one of the attached hosts must be successfully authorized for all hosts to be granted network
access. If the port becomes unauthorized (re-authentication fails or an EAPOL-logoff message is
received), all attached clients are denied access to the network.
With the multiple-hosts mode enabled, you can use 802.1x to authenticate the port and port security to
manage network access for all MAC addresses, including that of the client.
Beginning in privileged EXEC mode, follow these steps to allow multiple hosts (clients) on an
802.1x-authorized port that has the dot1x port-control interface configuration command set to auto.
This procedure is optional.
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
dot1x host-mode multi-host
Step 4 end
Step 5 show dot1x interface interface-id
Step 6
copy running-config startup-config
To disable multiple hosts on the port, use the no dot1x host-mode multi-host interface configuration
command.
This example shows how to enable 802.1x on a port and to allow multiple hosts:
Switch(config)# interface fastethernet1/0/1
Switch(config-if)# dot1x port-control auto
Switch(config-if)# dot1x host-mode multi-host
78-15870-01
Purpose
Enter global configuration mode.
Specify the port to which multiple hosts are indirectly attached, and enter
interface configuration mode.
Allow multiple hosts (clients) on an 802.1x-authorized port.
Make sure that the dot1x port-control interface configuration command
set is set to auto for the specified port.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Catalyst 3750 Metro Switch Software Configuration Guide
Configuring 802.1x Authentication
Figure 8-3 on page 8-5. In this
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