Configuring IEEE 802.1x Port-Based Authentication
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1 CHAPTER 8 Configuring IEEE 802.1x Port-Based Authentication This chapter describes how to configure IEEE 802.1x port-based authentication on the Cisco ME 3400 Ethernet Access switch. As LANs extend to hotels, airports, and corporate lobbies and create insecure environments, 802.1x prevents unauthorized devices (clients) from gaining access to the network. For complete syntax and usage information for the commands used in this chapter, see the command reference for this release. Note Some IEEE 802.1x (dot1x Appendix C, Unsupported Commands in Cisco IOS Release 12.2(50)SE. This chapter consists of these sections: Understanding IEEE 802.1x Port-Based Authentication, page 8-1 Configuring IEEE 802.1x Authentication, page 8-10 Displaying IEEE 802.1x Statistics and Status, page 8-24 Understanding IEEE 802.1x Port-Based Authentication Note CDP and STP are supported by default on network node interfaces (NNIs). You can enable CDP and STP on enhanced network interfaces (ENIs). User network nodes (UNIs) do not support CDP or STP. OL Cisco ME 3400 Ethernet Access Switch Software Configuration Guide 8-1
2 Understanding IEEE 802.1x Port-Based Authentication Chapter 8 Configuring IEEE 802.1x Port-Based Authentication IEEE 802.1x Accounting Attribute-Value Pairs, page 8-5 IEEE 802.1x Host Mode, page 8-6 Using 802.1x Readiness Check, page 8-7 Using IEEE 802.1x with Port Security, page 8-7 Using IEEE 802.1x with VLAN Assignment, page x Switch Supplicant with Network Edge Access Topology (NEAT), page 8-9 Device Roles With IEEE 802.1x port-based authentication, the devices in the network have specific roles as shown in Figure 8-1. Figure 8-1 IEEE 802.1x Device Roles Workstations (clients) Authentication server (RADIUS) Client the device (workstation) that requests access to the LAN and switch services and responds to requests from the switch. The workstation must be running IEEE 802.1x-compliant client software such as that offered in the Microsoft Windows XP operating system. (The client is the supplicant the Microsoft Knowledge Base article at this URL: Authentication server 8-2
3 Switch server s frame header is removed, leaving the EAP frame, which is then encapsulated for Ethernet and sent to the client. Authentication Initiation and Message Exchange dot1x port-control auto 8-3
4 Message Exchange Client Authentication server (RADIUS) EAPOL-Start EAP-Request/Identity EAP-Response/Identity EAP-Request/OTP EAP-Response/OTP EAP-Success RADIUS Access-Request RADIUS Access-Challenge RADIUS Access-Request RADIUS Access-Accept Port Authorized EAPOL-Logoff Port Unauthorized Ports in Authorized and Unauthorized States unauthorized authorized force-authorized force-unauthorized auto 8-4
5 IEEE 802.1x Accounting IEEE 802.1x Accounting Attribute-Value Pairs Table 8-1 Accounting AV Pairs Attribute number Attribute[1] Attribute[4] Attribute[5] Attribute[6] Attribute[8] Attribute[25] Attribute[30] Attribute[31] AV pair name User-Name NAS-IP-Address NAS-Port NAS-Port-Type Framed-IP-Address Class Called-Station-ID Calling-Station-ID 8-5
6 Accounting AV Pairs (continued) debug aaa accounting Cisco IOS Debug Command Reference, Release 12.2 debug radius accounting IEEE 802.1X Remote Authentication Dial In User Service (RADIUS) Usage Guidelines, for more information about AV pairs. IEEE 802.1x Host Mode 8-6
7 Figure 8-3 Multiple Host Mode Example Access point Authentication server (RADIUS) Wireless clients Using 802.1x Readiness Check Using IEEE 802.1x with Port Security switchport port-security 8-7
8 no switchport port-security mac-address mac-address interface-id dot1x re-authenticate interface dot1x violation-mode Using IEEE 802.1x with VLAN Assignment
9 Chapter 8 Configuring IEEE 802.1x Port-Based Authentication Understanding IEEE 802.1x Port-Based Authentication network [64] Tunnel-Type = VLAN [65] Tunnel-Medium-Type = 802 [81] Tunnel-Private-Group-ID = VLAN name or VLAN ID Attribute[64] must contain the value VLAN 802 VLAN name VLAN ID 802.1x Switch Supplicant with Network Edge Access Topology (NEAT) group user device-traffic-class=switch OL Cisco ME 3400 Ethernet Access Switch Software Configuration Guide 8-9
10 Figure 8-4 Authenticator and Supplicant Switch using CISP Configuring IEEE 802.1x Authentication 8-10
11 Chapter 8 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication Default IEEE 802.1x Configuration Default IEEE 802.1x Configuration Feature Default Setting OL Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
12 Configuring IEEE 802.1x Authentication Chapter 8 Configuring IEEE 802.1x Port-Based Authentication IEEE 802.1x Configuration Guidelines Maximum Number of Allowed Devices Per Port Cisco ME 3400 Ethernet Access Switch Software Configuration Guide OL
13 Chapter 8 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication Configuring 802.1x Readiness Check Step 1 Command Purpose Note Step 1 Step 2 Step 3 Step 4 switch# dot1x test eapol-capable interface gigabitethernet1/0/13 DOT1X_PORT_EAPOL_CAPABLE:DOT1X: MAC b-f1-a3 on gigabitethernet1/0/13 is EAPOL capable OL Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
14 Configuring IEEE 802.1x Authentication Chapter 8 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Violation Modes Command Purpose Step 1 Step 2 Step 3 { } Create an IEEE 802.1x authentication method list. To create a default list that is used when a named list is specified in the command, use the keyword followed by the method that is to be used in default situations. The default method list is automatically applied to all ports. For, enter the keywords to use the list of all RADIUS servers for authentication. Though other keywords are visible in the command-line help string, only the keywords are supported. Specify the port connected to the client that is to be enabled for IEEE 802.1x authentication, and enter interface configuration mode. Step 5 Step 6 } Step 7 Step 8 Step 9 Configure the violation mode. The keywords have these meanings: Error disable the port. Generate a syslog error. Drop packets from any new device that sends traffic to the port. Configuring IEEE 802.1x Authentication Cisco ME 3400 Ethernet Access Switch Software Configuration Guide OL
15 Chapter 8 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Step 1 Step 2 Step 3 Command Purpose Note Step 4 Step 5 Step 6 Step 7 Step 8 Step 9 Step 10 OL Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
16 Configuring IEEE 802.1x Authentication Chapter 8 Configuring IEEE 802.1x Port-Based Authentication Configuring the Switch-to-RADIUS-Server Communication rad123 Switch(config)# radius-server host 172.l auth-port 1612 key rad123 Cisco ME 3400 Ethernet Access Switch Software Configuration Guide OL
17 ; the default is 3600 seconds. This command affects the behavior of the switch only if periodic re-authentication is enabled. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. dot1x reauthentication dot1x timeout reauth-period 4000 dot1x re-authenticate interface gigabitethernet0/1
18 Changing the Quiet Period dot1x timeout quiet-period Enter global configuration mode. Specify the port to be configured, and enter interface configuration mode. Set the number of seconds that the switch remains in the quiet state following a failed authentication exchange with the client. The range is 1 to seconds; the default is 60. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. no dot1x timeout quiet-period dot1x timeout quiet-period 30 You should change the default value of this command only to adjust for unusual circumstances such as unreliable links or specific behavioral problems with certain clients and authentication servers. Beginning in privileged EXEC mode, follow these steps to change the amount of time that the switch waits for client notification. This procedure is optional. Enter global configuration mode. Specify the port to be configured, and enter interface configuration mode. Set the number of seconds that the switch waits for a response to an EAP-request/identity frame from the client before resending the request. The range is 1 to seconds; the default is 30.
19 To return to the default retransmission time, use the interface configuration command. This example shows how to set 60 as the number of seconds that the switch waits for a response to an EAP-request/identity frame from the client before resending the request: Setting the Switch-to-Client Frame-Retransmission Number Note dot1x max-req 5
20 dot1x max-reauth-req 4
21 interface gigabitethernet0/1 dot1x port-control auto dot1x host-mode multi-host Accounting message %s for session %s failed to receive Accounting Response. 00:09:55: %RADIUS-4-RADIUS_DEAD: RADIUS server :1645,1646 is not responding.
22 Switch(config)# radius-server host auth-port 1812 acct-port 1813 key rad123 Switch(config)# aaa accounting dot1x default start-stop group radius Switch(config)# aaa accounting system default start-stop group radius
23 Switch# configure terminal Switch(config)# cisp enable Switch(config)# interface gigabitethernet2/0/1 Switch(config-if)# switchport mode access authentication port-control auto dot1x pae authenticator spanning-tree portfast trunk
24 Displaying IEEE 802.1x Statistics and Status Step 12 Command Purpose Step 13 password myswitch Displaying IEEE 802.1x Statistics and Status
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