Example for Configuring Multiple Authentication Modes
- Tracy Yang
Networking Requirements
As shown in Figure 1, there are different types of terminal access the network in a company. For the security of the company network, the administrator needs to employ different types of NAC authentication modes on the access switch to control the access rights of different users.
Figure1. Topology for Configuring Multiple Authentication Modes
Figure 1 shows the topology for configuring multiple authentication modes. Follow the configuration roadmap below to complete the configuration.
Prerequisite
- Ensure that PICA8 Switch is properly connected to the AAA server. In this example, the switch uses the management port Eth0 to connect to the AAA server.
- Complete the NAC configurations on the AAA server. For details about how to configure NAC on AAA server, please refer to documents Typical Configuration of NAC.
Configuration Roadmap on PICA8 Switch
- A printer accesses the network through interface ge-1/1/1 of the switch. It is a dumb terminal and lacks the supplicant feature which is needed to pass on the 802.1X authentication credentials between the client and the authentication server. In this case, you can configure MAB authentication. You can use the set protocols dot1x interface <interface-name> auth-mode mac-radius command to enable MAB authentication mode on the interface.
- A guest user accesses the network through interface ge-1/1/2 of the switch, it doesn’t have proper 802.1X or MAC Radius credentials saved on the authentication servers. In this case, you can configure CWA authentication to control the guest user's network access rights. Remember to enable MAB authentication before using CWA authentication.
- On interface ge-1/1/3, a PC and an IP telephone are connected to the switch so that both data and voice services can be transmitted.
- Enable LLDP protocol for OUI learning from LLDP packets.
- Configure 802.1X authentication on the ge-1/1/3 interface to perform access authentication on the connected PC.
- Since there are two devices, a PC and an IP telephone, on port ge-1/1/3, you need to configure access port ge-1/1/3 for multiple host mode authentication.
- It is strongly recommended not to use both voice VLAN and dynamic VLAN on the port enabled with NAC function. If both voice VLAN and dynamic VLAN are enabled on the port, dynamic VLAN A has a higher priority.
- In this example, on the AAA server, you have to configure voice VLAN 300 for IP phone communication and dynamic VLAN 400 for data communication for the PC on the ge-1/1/3 interface.
- On the switch, you need to use the set vlans vlan-id <vlan-id> command to create the dynamic VLANs in advance. And the link type of interface ge-1/1/3 should be configured as trunk port.
- Multiple PCs are connected to the switch on ge-1/1/4 interface. Enable 802.1X authentication on ge-1/1/4, and configure access port ge-1/1/4 for multiple host mode authentication.
Procedure
Step1 Create VLANs on the switch for dynamic VLAN.
admin@XorPlus# set vlans vlan-id 300 admin@XorPlus# set vlans vlan-id 400
Step2 Configure the access ports to trunk mode.
admin@XorPlus# set interface gigabit-ethernet ge-1/1/1 family ethernet-switching port-mode trunk admin@XorPlus# set interface gigabit-ethernet ge-1/1/2 family ethernet-switching port-mode trunk admin@XorPlus# set interface gigabit-ethernet ge-1/1/3 family ethernet-switching port-mode trunk admin@XorPlus# set interface gigabit-ethernet ge-1/1/4 family ethernet-switching port-mode trunk
Step3 Enable the authentication mode.
admin@XorPlus# set protocols dot1x interface ge-1/1/1 auth-mode mac-radius admin@XorPlus# set protocols dot1x interface ge-1/1/2 auth-mode web admin@XorPlus# set protocols dot1x interface ge-1/1/2 auth-mode mac-radius admin@XorPlus# set protocols dot1x interface ge-1/1/3 auth-mode 802.1x admin@XorPlus# set protocols dot1x interface ge-1/1/3 auth-mode mac-radius admin@XorPlus# set protocols dot1x interface ge-1/1/4 auth-mode 802.1x
Step4 Configure IP address of AAA server, DNS server and CoA client.
admin@XorPlus# set protocols dot1x aaa radius authentication server-ip 10.10.51.4 shared-key pica8 admin@XorPlus# set protocols dot1x aaa radius dynamic-author client 10.10.51.4 shared-key pica8 admin@Xorplus# set system dns-server-ip 192.168.10.1
Step5 Configure a block VLAN for CWA authentication.
admin@Xorplus# set protocols dot1x block-vlan-id 200 admin@XorPlus# set interface gigabit-ethernet ge-1/1/2 family ethernet-switching native-vlan-id 200 admin@XorPlus# set vlans vlan-id 200 l3-interface vlan200 admin@XorPlus# set l3-interface vlan-interface vlan200 address 10.10.51.11 prefix-length 24
Step6 Configure the NAS IP address to the IP of the management interface eth0 which connected to the AAA server.
admin@XorPlus# set protocols dot1x aaa radius nas-ip 10.10.51.100
This command is to set the nas-ip field in RADIUS access-request message. If you use the management interface eth0/eth1 to connect to the AAA server, the IP address of the management interface eth0/eth1 should be used for the NAS IP address configured here.
Step7 Configure the host mode for NAC authentication interface.
admin@XorPlus# set protocols dot1x interface ge-1/1/3 host-mode multiple admin@XorPlus# set protocols dot1x interface ge-1/1/4 host-mode multiple
Step8 Enable LLDP protocol for OUI learning from LLDP packets.
admin@XorPlus# set protocols lldp enable true
Step9 (Optional) Enable PoE function on the interface ge-1/1/3 if the IP telephone obtains power through the PoE port of the switch.
admin@XorPlus# set poe interface ge-1/1/3 enable true
Step10 Commit the configuration.
admin@XorPlus# commit
Verify the configuration
a) Run the run show dot1x interface or run show dot1x interface gigabit-ethernet <interface-name> to check the NAC authentication configurations. The command output shows that the NAC authentication has been enabled and the terminals are successfully authenticated on each port.
admin@Xorplus# run show dot1x interface
Interface 802.1x MAC-RADIUS WEB HOST-MODE CLIENT-MAC CLIENT-STATUS
----------------------------------------------------------------------------------------------
ge-1/1/1 disable enable disable single(1) f8:9e:01:9e:cc:a1 authorized
ge-1/1/2 disable enable enable single(2) 23:5e:81:77:ac:a2 authorized
ge-1/1/3 enable enable disable multiple(2) ad:ee:02:45:d3:a3 authorized
6d:33:12:4b:ef:a4 authorized
ge-1/1/4 enable enable disable multiple(3) f2:3e:00:8a:90:a5 authorized
a2:44:00:5a:90:3d authorized
56:33:a0:ee:f0:ab authorized
admin@Xorplus# run show dot1x interface gigabit-ethernet ge-1/1/3
Interface ge-1/1/3:
============================================================
Client MAC : ad:ee:02:45:d3:a3
Status : authorized
Success Auth Method : MAB
Traffic Class : Voice
Dynamic VLAN ID : 300 (active)
============================================================
Client MAC : 6d:33:12:4b:ef:a4
Status : authorized
Success Auth Method : MAB
Traffic Class : Other
Dynamic VLAN ID : 400 (active)
============================================================
b) Use run show lldp neighbor command to check the LLDP neighbor information on interface ge-1/1/3.
admin@Xorplus# run show lldp neighbor LLDP Remote Devices Information LocalPort ChassisId PortId Management Address System Name Platform Capability ---------- ------------------------ ----------------- ------------------ --------------- ----------------- ----------------- ge-1/1/3 3C:2C:99:41:47:E1 ge-1/1/13 10.10.51.100 Xorplus as4610_30t B, R
c) The terminal can access the network after passed the corresponding authentication method.
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