Cisco 2950 Software Configuration Guide - Page 235
Configuring the Host Mode
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Chapter 10 Configuring 802.1x Port-Based Authentication Configuring 802.1x Authentication To return to the default retransmission number, use the no dot1x max-req interface configuration command. This example shows how to set 5 as the number of times that the switch sends an EAP-request/identity request before restarting the authentication process: Switch(config-if)# dot1x max-req 5 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 Figure 10-3 on page 10-6. In this 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 (for switches running the EI). 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. Step 1 Step 2 Command configure terminal interface interface-id Step 3 dot1x host-mode multi-host Step 4 Step 5 Step 6 end show dot1x interface interface-id copy running-config startup-config Purpose Enter global configuration mode. Specify the interface 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 interface. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. To disable multiple hosts on the port, use the no dot1x host-mode multi-host interface configuration command. This example shows how to enable a port to allow multiple hosts: Switch(config)# interface fastethernet0/1 Switch(config-if)# dot1x port-control auto Switch(config-if)# dot1x host-mode multi-host 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 10-17
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