Cisco Systems IE 2000 MAC Move, MAC Replace

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Cisco IE 2000 Switch Software Configuration Guide
OL-25866-01
Chapter 13 Configuring IEEE 802.1x Port-Based Authentication
Information About Configuring IEEE 802.1x Port-Based Authentication
For more information about configuring multiauth mode on a port, see the “Configuring the Host Mode”
section on page 13-38.
MAC Move
When a MAC address is authenticated on one switch port, that address is not allowed on another
authentication manager-enabled port of the switch. If the switch detects that same MAC address on
another authentication manager-enabled port, the address is not allowed.
There are situations where a MAC address might need to move from one port to another o n the same
switch. For example, when there is another device (for example a hub or an IP phone) between an
authenticated host and a switch port, you might want to disconnect the host from the device and connect
it directly to another port on the same switch.
You can globally enable MAC move so the device is reauthenticated on the new port. When a host moves
to a second port, the session on the first port is deleted, and the host is reauthenticated on the new port.
MAC move is supported on all host modes. (The authenticated host can move to any port on the switch,
no matter which host mode is enabled on the that port.)
When a MAC address moves from one port to another, the switch terminates the authenticated session
on the original port and initiates a new authentication sequence on the new port.
The MAC move feature applies to both voice and data hosts.
Note In open authentication mode, a MAC address is immediately moved from the original port to the new
port, with no requirement for authorization on the new port.
For more information see the “Configuring Optional 802.1x Authentication Features” section on
page 13-40.
MAC Replace
The MAC replace feature can be configured to address the violation that occurs when a host attempts to
connect to a port where another host was previously authenticated.
Note This feature does not apply to ports in multiauth mode, because violations are not triggered in that mode.
It does not apply to ports in multiple host mode, because in that mode, only the first host requires
authentication.
If you configure the authentication violation interface configuration command with the replace
keyword, the authentication process on a port in multidomain mode is:
• A new MAC address is received on a port with an existing authen ticated MAC address.
• The authentication manager replaces the MAC address of the current data host on the port with the
new MAC address.
• The authentication manager initiates the authentication process for the new MAC address.
• If the authentication manager determines that the new host is a voice host, the original voice host is
removed.