Cisco Catalyst 2960 Series, Configuration Manual

Page: 1431 / 2288

• 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 IEEE 802.1x authentication.
•
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.
• When a port host mode is changed from single- or multihost to multidomain mode, an authorized data
device remains authorized on the port. However, a Cisco IP phone that has been allowed on the port
voice VLAN is automatically removed and must be reauthenticated on that port.
• Active fallback mechanisms such as guest VLAN and restricted VLAN remain configured after a port
changes from single- or multihost mode to multidomain mode.
• Switching a port host mode from multidomain to single- or multihost mode removes all authorized
devices from the port.
• If a data domain is authorized first and placed in the guest VLAN, non-IEEE 802.1x-capable voice
devices need to tag their packets on the voice VLAN to trigger authentication.
• We do not recommend per-user ACLs with an MDA-enabled port. An authorized device with a per-user
ACL policy might impact traffic on both the voice and data VLANs of the port. If used, only one device
on the port should enforce per-user ACLs.
Limiting Login for Users
The Limiting Login feature helps Network administrators to limit the login attempt of users to a network.
When a user fails to successfully login to a network within a configurable number of attempts within a
configurable time limit, the user can be blocked. This feature is enabled only for local users and not for remote
users. You need to configure the
aaa authentication rejected
command in global configuration mode to
enable this feature.
802.1x Supplicant and Authenticator Switches with Network Edge Access Topology (NEAT)
The Network Edge Access Topology (NEAT) feature extends identity to areas outside the wiring closet (such
as conference rooms). This allows any type of device to authenticate on the port.
• 802.1x switch supplicant: You can configure a switch to act as a supplicant to another switch by using
the 802.1x supplicant feature. This configuration is helpful in a scenario, where, for example, a switch
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
1349
Information About 802.1x Port-Based Authentication