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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 9 Configuring IEEE 802.1x Port-Based Authentication
Understanding IEEE 802.1x Port-Based Authentication
Table 9-1 lists the AV pairs and when they are sent are sent by the switch:
You can view the AV pairs that are being sent by the switch by entering the debug radius accounting
priveliged EXEC command. For more information about this command, see the Cisco IOS Debug Com-
mand Reference, Release 12.2 at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122sup/122debug
For more information about AV pairs, see RFC 3580, “IEEE 802.1X Remote Authentication Dial In User
Service (RADIUS) Usage Guidelines.”
IEEE 802.1x Host Mode
You can configure an IEEE 802.1x port for single-host or for multiple-hosts mode. In single-host mode
(see Figure 9-1 on page 9-2), only one client can be connected to the IEEE 802.1x-enabled switch port.
The switch detects the client by sending an EAPOL frame when the port link state changes to the up
state. If a client leaves or is replaced with another client, the switch changes the port link state to down,
and the port returns to the unauthorized state.
In multiple-hosts mode, you can attach multiple hosts to a single IEEE 802.1x-enabled port. Figure 9-3
on page 9-7 shows IEEE 802.1x port-based authentication in a wireless LAN. In this mode, only one of
the attached clients must be authorized for all clients to be granted network access. If the port becomes
Table 9-1 Accounting AV Pairs
Attribute Number AV Pair Name START INTERIM STOP
Attribute[1] User-Name Always Always Always
Attribute[4] NAS-IP-Address Always Always Always
Attribute[5] NAS-Port Always Always Always
Attribute[8] Framed-IP-Address Never Sometimes
1
1. The Framed-IP-Address AV pair is sent only if a valid Dynamic Host Control Protocol (DHCP) binding
exists for the host in the DHCP snooping bindings table.
Sometimes
1
Attribute[25] Class Always Always Always
Attribute[30] Called-Station-ID Always Always Always
Attribute[31] Calling-Station-ID Always Always Always
Attribute[40] Acct-Status-Type Always Always Always
Attribute[41] Acct-Delay-Time Always Always Always
Attribute[42] Acct-Input-Octets Never Never Always
Attribute[43] Acct-Output-Octets Never Never Always
Attribute[44] Acct-Session-ID Always Always Always
Attribute[45] Acct-Authentic Always Always Always
Attribute[46] Acct-Session-Time Never Never Always
Attribute[49] Acct-Terminate-Cause Never Never Always
Attribute[61] NAS-Port-Type Always Always Always
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