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Example: Configuring VoIP on an EX-series Switch Without Including 802.1X Authentication

You can configure voice over IP (VoIP) on an EX-series switch to support IP telephones. VoIP is a protocol used for the transmission of voice through packet-switched networks. VoIP transmits voice calls using a network connection instead of an analog phone line.

To configure VoIP on an EX-series switch to support an IP phone that does not support 802.1X authentication, you must add the MAC address of the phone as a static entry in the authenticator database.

This example describes how to configure VoIP on an EX-series switch without 802.1X authentication:

Requirements

This example uses the following hardware and software components:

  • JUNOS Release 9.1 or later for EX-series switches
  • An IP telephone without 802.1X authentication

Before you configure VoIP, be sure you have:

Overview

Instead of using a regular telephone, you connect an IP telephone directly to the switch. An IP phone has all the hardware and software needed to handle VoIP. You also can power an IP telephone by connecting it to one of the Power over Ethernet (PoE) interfaces on the switch.

In this example, the access interface ge-0/0/2 on the EX 4200 switch is connected to a non-802.1X IP phone.

To configure VoIP on an EX-series switch to support an IP phone that does not support 802.1X authentication, add the MAC address of the phone as a static entry in the authenticator database and set the supplicant mode to multiple.

Configuration

To configure VoIP without 802.1X authentication:

    CLI Quick Configuration

    To quickly configure VoIP, copy the following commands and paste them into the switch terminal window:


    [edit]

    set vlans data-vlan vlan-id 77

    set vlans voice-vlan vlan-id 99

    set vlans data-vlan interface ge-0/0/2.0

    set interfaces ge-0/0/2 unit 0 family ethernet-switching vlan members data-vlan

    set interfaces ge-0/0/2 unit 0 family ethernet-switching port-mode access

    set ethernet—switching—options voip interface ge-0/0/2.0 vlan voice-vlan

    set ethernet—switching—options voip interface ge-0/0/2.0 forwarding-class assured-forwarding

    set protocols lldp–med interface ge-0/0/2.0

    set protocols dot1x authenticator authentication-profile-name auth-profile

    set protocols dot1x authenticator static 00:04:f2:11:aa:a7

    set protocols dot1x authenticator interface ge-0/0/2.0 supplicant multiple

    Step-by-Step Procedure

    To configure VoIP without 802.1X:

    1. Configure the VLANs for voice and data:
      [edit vlans]
      user@switch# set data-vlan vlan-id 77
      user@switch# set voice-vlan vlan-id 99
    2. Associate the VLAN data-vlan with the interface:
      [edit vlans]
      user@switch# set data-vlan interface ge-0/0/2.0
    3. Configure the interface as an access interface, configure support for Ethernet switching, and add the data-vlan VLAN:
      [edit interfaces]
      user@switch# set ge-0/0/2 unit 0 family ethernet-switching vlan members data-vlan
      user@switch# set ge-0/0/2 unit 0 family ethernet-switching port-mode access
    4. Configure VoIP on the interface and specify the assured-forwarding forwarding class to provide the most dependable class of service:
      [edit ethernet—switching—options]
      user@switch# set voip interface ge-0/0/2.0 vlan voice-vlan
      user@switch# set voip interface ge-0/0/2.0 forwarding-class assured-forwarding
    5. Configure LLDP-MED protocol support:
      [edit protocols]
      user@switch# set lldp-med interface ge-0/0/2.0
    6. Set the authentication profile (see Configuring 802.1X Authentication (CLI Procedure) and Configuring 802.1X RADIUS Accounting (CLI Procedure)):
      [edit protocols]
      set dot1x authenticator authentication-profile-name auth-profile
    7. Specify the MAC address of the phone:
      [edit protocols]
      set dot1x authenticator static 00:04:f2:11:aa:a7
    8. Set the supplicant mode to multiple:
      [edit protocols]
      set dot1x authenticator interface ge-0/0/2.0 supplicant multiple

    Results

    Display the results of the configuration:

    [edit]
    user@switch# show configuration
    interfaces {
    ge-0/0/2 {
    unit 0 {
    family ethernet-switching {
    port-mode access;
    vlan {
    members data-vlan;
    }
    }
    }
    }
    }
    protocols {
    lldp-med {
    interface ge-0/0/2.0;
    }
    dot1x {
    authenticator {
    authentication-profile-name auth-profile;
    static {
    00:04:f2:11:aa:a7;
    }
    }
    interface {
    ge-0/0/2.0 {
    supplicant multiple;
    }
    }
    }
    }
    vlans {
    data-vlan {
    vlan-id 77;
    interface {
    ge-0/0/2.0;
    }
    }
    voice-vlan {
    vlan-id 99;
    }
    }
    ethernet-switching options {
    voip {
    interface ge-0/0/2.0 {
    vlan voice-vlan;
    forwarding-class assured-forwarding;
    }
    }
    }

    Verification

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

    Verifying LLDP-MED Configuration

    Purpose

    Verify that LLDP-MED is enabled on the interface.

    Action


    user@switch> show lldp detail 

    LLDP                   : Enabled
Advertisement interval : 30 Second(s)
Transmit delay         : 2 Second(s)
Hold timer             : 2 Second(s)
Config Trap Interval   : 300 Second(s)
Connection Hold timer  : 60 Second(s)

LLDP MED               : Enabled
MED fast start count   : 3 Packet(s)


Interface      LLDP       LLDP-MED    Neighbor count
all            Enabled    -           0         
ge-0/0/2.0     -          Enabled     0         

Interface     VLAN-id     VLAN-name
ge-0/0/0.0    0           default  
ge-0/0/1.0    0           employee-vlan
ge-0/0/2.0    0           data-vlan
ge-0/0/2.0    99          voice-vlan
ge-0/0/3.0    0           employee-vlan
ge-0/0/8.0    0           employee-vlan
ge-0/0/10.0   0           default  
ge-0/0/11.0   20          employee-vlan
ge-0/0/11.0   0           __juniper-vlan_internal__
ge-0/0/23.0   0           default  

LLDP basic TLVs supported: 
Chassis identifier, Port identifier, Port description, System name, System
description, System capabilities, Management address.

LLDP 802 TLVs supported: 
Power via MDI, Link aggregation, Maximum frame size, Port VLAN tag, Port
VLAN name.

LLDP MED TLVs supported: 
LLDP MED capabilities, Network policy, Endpoint location, Extended power
Via MDI.

    Meaning

    The show lldp detail output shows that both LLDP and LLDP-MED are configured on the ge-0/0/2.0 interface. The end of the output shows the list of supported LLDP basic TLVs, 802.3 TLVs, and LLDP-MED TLVs that are supported.

    Verifying Authentication for the Desktop PC

    Purpose

    Display the 802.1X configuration for the desktop PC connected to the VoIP interface through the IP phone.

    Action


    user@switch> show dot1x interface ge/0/0/2.0 detail 
    ge-0/0/2.0
  Role: Authenticator
  Administrative state: Auto
  Supplicant mode: Multiple
  Number of retries: 3
  Quiet period: 60 seconds
  Transmit period: 30 seconds
  Reauthentication: Enabled Reauthentication interval: 3600 seconds
  Supplicant timeout: 30 seconds
  Supplicant timeout: 30 seconds
  Server timeout: 30 seconds
  Maximum EAPOL requests: 2
  Number of connected supplicants: 1
    Supplicant: abc, 00:00:00:00:22:22
      Operational state: Authenticated
      Reauthentication due in 3588 seconds

    Meaning

    The field Role shows that the ge-0/0/2.0 interface is in the authenticator state. The Supplicant field shows that the interface is configured in multiple supplicant mode, permitting multiple supplicants to be authenticated on this interface. The MAC addresses of the supplicants currently connected are displayed at the bottom of the output.

    Verifying the VLAN Association with the Interface

    Purpose

    Display the interface state and VLAN membership.

    Action


    user@switch> show ethernet-switching interfaces 

     Ethernet-switching table: 0 entries, 0 learned

user@switch> show ethernet-switching interfaces 
Interface   State    VLAN members           Blocking 
ge-0/0/0.0  down     default                unblocked
ge-0/0/1.0  down     employee-vlan          unblocked
ge-0/0/5.0  down     employee-vlan          unblocked
ge-0/0/3.0  down     employee-vlan          unblocked
ge-0/0/8.0  down     employee-vlan          unblocked
ge-0/0/10.0 down     default                unblocked
ge-0/0/11.0 down     employee-vlan          unblocked
ge-0/0/23.0 down     default                unblocked
ge-0/0/2.0  up       voice-vlan             unblocked
                     data-vlan              unblocked

    Meaning

    The field VLAN members shows that the ge-0/0/2.0 interface supports both the data-vlan VLAN and voice-vlan VLAN. The State field shows that the interface is up.