LLDP-MED (Link Layer Discovery Protocol-Media Endpoint Discovery)
As a standard and open protocol, LLDP is a good protocol. After the development of LLDP, some of the additional properties needed especially for Voice Over IP (VoIP). So LLDP extended.
The extended version of LLDP is LLDP-MED (Link Layer Discovery Protocol – Media Endpoint Discovery). You can also called this “LLDP for Media Endpoint Devices”.
LLDP enables network discovery between network devices and the endpoint devices like IP Phones, gateways etc.
LLDP-MED has three classes that specifies the endpoint’s capabilities. These classes are :
• Class 1 : This LLDP-MED class requires a basic LLDP discovery. Communication controller servers are in this class.
• Class 2 : This LLDP-MED class do not require end user. Voice and Media Gateways, Bridges etc. are in these class.
• Class 3 : This LLDP-MED class is used for the end users. IP Phones, Softphones etc.