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Configuring LLDP-MED on MX Series Routers in Enhanced LAN Mode

Link Layer Discovery Protocol–Media Endpoint Discovery (LLDP-MED) is an extension of LLDP. Starting with Junos OS Release 14.2, the router uses LLDP-MED to support device discovery of VoIP telephones and to create location databases for these telephone locations.

LLDP-MED is turned on by default on MX Series routers.

This topic describes:

Enabling LLDP-MED on Interfaces

LLDP-MED is enabled on all interfaces by default. If it is disabled, you can enable LLDP-MED by configuring it on all interfaces or on specific interfaces.

To configure LLDP-MED on all interfaces or on a specific interface:

Configuring Location Information Advertised by the Router

You can configure the location information that is advertised from the router to the LLDP-MED device. You can specify a civic-based location (geographic location) or a location based on an ELIN (Emergency Location Identification Number):

  • To specify a location by geography:

  • To specify a location using an elin string:

Configuring for Fast Start

You can specify the number of LLDP-MED advertisements sent from the router in the first second after it has detected an LLDP-MED device. The default is 3; to set it to another value:

Note:

If an interface is configured as a VoIP interface, then the router does not wait for an attached phone to identify itself as an LLDP-MED device before it performs an LLDP-MED fast start after a graceful Routing Engine switchover (GRES) or a reboot. Instead, it immediately performs an LLDP-MED fast start after a GRES or reboot. This behavior prevents certain models of IP phones from resetting after a GRES.

Release History Table
Release
Description
14.2
Starting with Junos OS Release 14.2, the router uses LLDP-MED to support device discovery of VoIP telephones and to create location databases for these telephone locations.