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  • Lldp-med

    Does anyone know if 9.0 supports LLDP-MED ?

  • #2
    Using a VoIP phone system and installing one, are two entirely different user experiences! Most product development efforts focus necessarily on end user features and benefits. Anyone who has ever installed a VoIP system knows that if design engineers ever actually installed a system we would have a range of exciting new configuration automation tools! Case in point: LLDP. Until version 9, ShoreTel IP phone deployment was a two step process. First you would install your handsets on the net and they would boot up in the native VLAN. If you were deploying 100 desktops, this meant that the phones would eat up 100 of your native VLAN DHCP leases. The phones would then obtain their VLAN tag and reboot in the correct VLAN. The native VLAN lease damage, however was already done, not to mention waiting for that second boot DHCP broadcast request for service. A number of vendors had previously create proprietary discovery protocols to overcome this behavior. CISCO has always had CDP,( not to be confused with Enterasys Cabletron Discovery Protocol); Nortel had NDP; Extreme Networks had EDP and Foundry had FDP. In 2005 an industry standard, LLDP was adopted and later modified to become LLDP-MED or Link Layer Discovery Protocol for Media Endpoint Devices. ShoreTel, rather than event yet another vendor proprietary protocol has adopted this industry standard greatly simplifying IP phone deployment. LLDP-MED allows network devices to advertise their identify and capability through a multicast. This enables the phones to come up on the network in the correct VLAN, eliminating the multi-boot requirement. Now this is not a feature that an end user will notice or appreciate, but those of us who have to spend hours deploying VoIP desktops say Cheers! - Drvoip


    • #3
      Thanks for the reply.

      So if I ordered a shoretel system with 8.1, after I upgrade it to 9.0. Does this mean that I need to provision all of my Shoretel phones with the normal two step DHCP process in order to get the latest firmware for the phones to recognize LLDP?

      This is inconvenient with a new shoretel implementation, in that the switch config would need to be entirely different before I could use the benefits of LLDP.

      For example, If I need to provision all of my phones with the latest firmware to have them understand LLDP, I would initially have to setup my switch interfaces with the following config:

      #switchport trunk encap dot1q
      #switchport trunk allowed vlan 10, 50
      #switchport mode trunk
      #switchport trunk native vlan 50

      then, once the phones understand LLDP, I can then use:

      #switchport mode access
      #switchport access vlan 50
      #switchport VOICE vlan 10

      Am I correct in this way?... Will the phones actually need to be upgraded before I can even use LLDP?