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Example: Setting Up 802.1X in Conference Rooms to Provide Internet Access to Corporate Visitors on an EX Series Switch

802.1X on EX Series switches provides LAN access to users who do not have credentials in the RADIUS database. These users, referred to as guests, are authenticated and typically provided with access to the Internet.

This example describes how to create a guest VLAN and configure 802.1X authentication for it.

Requirements

This example uses the following hardware and software components:

  • JUNOS Release 9.0 or later for EX Series switches
  • One EX Series switch acting as an authenticator interface access entity (PAE). The interfaces on the authenticator PAE form a control gate that blocks all traffic to and from supplicants until they are authenticated.
  • One RADIUS authentication server that supports 802.1X. The authentication server acts as the backend database and contains credential information for hosts (supplicants) that have permission to connect to the network.

Before you configure guest VLAN authentication, be sure you have:

Overview and Topology

As part of IEEE 802.1X Port-Based Network Access Control (PNAC), you can provide limited network access to supplicants who do not belong to a VLAN authentication group by configuring authentication to a guest VLAN. Typically, guest VLAN access is used to provide Internet access to visitors to a corporate site. However, you can also use the guest VLAN feature to provide supplicants that fail 802.1X authentication to a corporate LAN with access to a VLAN with limited resources.

Figure 1 shows the conference room connected to the switch at interface ge-0/0/1.

Figure 1: Topology for Guest VLAN Example

Image g020072.gif

Table 1: Components of the Guest VLAN Topology

Property Settings

Switch hardware

EX4200 switch, 24 Gigabit Ethernet interfaces: 8 PoE interfaces (ge-0/0/0 through ge-0/0/7) and 16 non-PoE interfaces (ge-0/0/8 through ge-0/0/23)

VLAN names and tag IDs

sales, tag 100
support, tag 200

guest-vlan, tag 300

One RADIUS server

Backend database connected to the switch through interface ge-0/0/10

In this example, access interface ge-0/0/1 provides LAN connectivity in the conference room. Configure this access interface to provide LAN connectivity to visitors in the conference room who are not authenticated by the corporate VLAN.

Configuration of a Guest VLAN That Includes 802.1X Authentication

To create a guest VLAN and configure 802.1X authentication, perform these tasks:

CLI Quick Configuration

To quickly configure a guest VLAN, with 802.1X authentication, copy the following commands and paste them into the switch terminal window:


[edit]

set vlans guest-vlan vlan-id 300

set protocols dot1x authenticator interface all guest-vlan guest-vlan

Step-by-Step Procedure

To configure a guest VLAN that includes 802.1X authentication on an EX Series switch:

  1. Configure the VLAN ID for the guest VLAN:

    [edit]


    user@switch# set vlans guest-vlan vlan-id 300
  2. Configure the guest VLAN under dot1x protocols:

    [edit]


    user@switch# set protocols dot1x authenticator interface all guest-vlan guest-vlan

Results

Check the results of the configuration:

user@switch> show configuration
protocols {
dot1x {
authenticator {
interface {
all {
guest-vlan {
guest-vlan;
}
}
}
}
}
}
vlans {
guest-vlan {
vlan-id 300;
}
}

Verification

To confirm that the configuration is working properly, perform these tasks:

Verifying That the Guest VLAN is Configured

Purpose

Verify that the guest VLAN is created and that an interface has failed authentication and been moved to the guest VLAN.

Action

Use the operational mode commands:


user@switch> show vlans
Name           Tag     Interfaces
default       
                       ge-0/0/3.0*
dynamic        40      
                       None
guest          30      
                       None
guest—vlan     300
                       ge-0/0/1.0*
vlan_dyn      
                       None


user@switch> show dot1x interface ge-0/0/1.0 detail
ge-0/0/1.0
  Role: Authenticator
  Administrative state: Auto
  Supplicant mode: Single
  Number of retries: 3
  Quiet period: 60 seconds
  Transmit period: 30 seconds
  Mac Radius: Enabled
  Mac Radius Restrict: Disabled
  Reauthentication: Enabled
  Configured Reauthentication interval: 3600 seconds
  Supplicant timeout: 30 seconds
  Server timeout: 30 seconds
  Maximum EAPOL requests: 2
  Guest VLAN member: guest-vlan
  Number of connected supplicants: 1
    Supplicant: user1, 00:00:00:00:13:23
      Operational state: Authenticated
      Authentication method: Radius
      Authenticated VLAN: vo11
      Dynamic Filter: match source-dot1q-tag 10 action deny
      Session Reauth interval: 60 seconds
      Reauthentication due in 50 seconds

Meaning

The output from the show vlans command shows guest-vlan as the the name of the VLAN and the VLAN ID as 300.

The output from the show dot1x interface ge-0/0/1.0 detail command displays the Guest VLAN membership field, indicating that a supplicant at this interface failed 802.1X authentication and was passed through to the guest-vlan.


Published: 2009-10-06

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