Multidomain Authentication - Cisco Catalyst 2960 Software Configuration Manual
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Chapter 10
Configuring IEEE 802.1x Port-Based Authentication
The switch supports multidomain authentication (MDA), which allows both a data device and a voice
device, such as an IP Phone (Cisco or non-Cisco), to connect to the same switch port. For more
information, see the
Multidomain Authentication
The switch supports multidomain authentication (MDA), which allows both a data device and voice
device, such as an IP phone (Cisco or non-Cisco), to authenticate on the same switch port. The port is
divided into a data domain and a voice domain.
To use MDA, the switch must be running the LAN base image.
Note
MDA does not enforce the order of device authentication. However, for best results, we recommend that
a voice device is authenticated before a data device on an MDA-enabled port.
Follow these guidelines for configuring MDA:
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Note
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OL-26520-01
"Multidomain Authentication" section on page
To configure a switch port for MDA, see the
You must configure the voice VLAN for the IP phone when the host mode is set to multidomain. For
more information, see
Chapter 13, "Configuring VLANs."
Voice VLAN assignment on an MDA-enabled port is supported in Cisco IOS Release 12.2(40)SE
and later.
If you use a dynamic VLAN to assign a voice VLAN on an MDA-enabled switch port on a switch
running Cisco IOS Release 12.2(37)SE, the voice device fails authorization.
To authorize a voice device, the AAA server must be configured to send a Cisco Attribute-Value
(AV) pair attribute with a value of
treats the voice device as a data device.
The guest VLAN and restricted VLAN features only apply to the data devices on an MDA-enabled
port. The switch treats a voice device that fails authorization as a data device.
If more than one device attempts authorization on either the voice or the data domain of a port, it is
error disabled.
Until a device is authorized, the port drops its traffic. Non-Cisco IP phones or voice devices are
allowed into both the data and voice VLANs. The data VLAN allows the voice device to contact a
DHCP server to obtain an IP address and acquire the voice VLAN information. After the voice
device starts sending on the voice VLAN, its access to the data VLAN is blocked.
A voice device MAC address that is binding on the data VLAN is not counted towards the port
security MAC address limit.
MDA can use MAC authentication bypass as a fallback mechanism to allow the switch port to
connect to devices that do not support 802.1x authentication. For more information, see the
Authentication Bypass" section on page
When a data or a voice device is detected on a port, its MAC address is blocked until authorization
succeeds. If the authorization fails, the MAC address remains blocked for 5 minutes.
If more than five devices are detected on the data VLAN or more than one voice device is detected
on the voice VLAN while a port is unauthorized, the port is error disabled.
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
Understanding IEEE 802.1x Port-Based Authentication
"Configuring the Host Mode" section on page
device-traffic-class=voice
10-40.
10-13.
. Without this value, the switch
10-46.
"MAC
10-13
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