LANCOM Support Knowledgebase Document No. 1802.1613.2539.RHOO - V2.40

LANCOM GS-23xx: Voice-VLAN configuration and automatic assignment to IP telephones by means of LLDP-MED

This document describes the configuration required on a LANCOM managed switch of the GS-23xx series in order to configure a voice VLAN and automatically assign it to an IP telephone that supports the LLPD-MED standard.

LLDP-MED (Link Layer Discovery Protocol - Media Endpoint Devices) is an extension of the LLDP protocol that supports the interoperability of VoIP terminals and other devices on the network, such as a PC.

  • IP telephone supporting LLDP-MED

  • In this example, the Voice VLAN has the ID 200, and LLDP is to be used as the discovery protocol.
  • The IP telephone should be assigned this VLAN ID automatically as soon as it is connected to the designated switch port.

1) Connect the IP telephone to the switch. For this example we use switch port 1.

2) Activate LLDP by setting Enabled for the desired switch ports.

3) As soon as the LLDP-MED-compatible IP telephone has been connected, you should see the appropriate information in the menus LLDP Neighbors and LLDP-MED Neighbors.

    Check the menu LLDP-MED Neighbors to see whether the terminal supports the application type Voice.

4) Configure LLDP-MED on port 1 with the following values:
  • Application type: Voice
  • VLAN ID: 200
  • L2 priority: 6
  • DSCP: 49

5) Recheck the LLDP-MED Neighbor information after the LLDP negotiation between the switch and the IP telephone.

6) Switch to the menu Voice LAN -> Configuration.
  • Enable the Voice LAN feature and set the VLAN ID to 200.
  • Set the port mode of switch port 1 to Auto and set the Discovery Protocol to LLDP.

7) Make sure that port 1 is a member of the VLAN with the ID 200.

8) This concludes the configuration. Save the configuration changes to the switch.

9) Enter the VLAN ID (here the 200) in the configuration of your telephone.

Function check:

To check the functionality please connect a PC to the switch, e.g. to port 3 and perform the following configuration on the switch:
  • Port 3 must be a member of the VLAN with the ID 200.

  • In the VLAN port configuration, port 3 needs to be set with the PVID 200.

  • Save the configuration to the switch. You should now be able to send a ping from the PC connected to port 3 to the IP telephone connected to port 1.
    Catchwords: sip; telephone; lldp; lldp-med; switch
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