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VPLS Labelling (Tunnel and Service Labels) As we discussed in the MPLS articles before, for MPLS we need labels. VPLS is also a MPLS Service, so we need to use labels in VPLS too. There are two MPLS labels used in VPLS. These labels are: • Outher Label (Transport Label) • Inner Label (Servise Label […]


VPLS MAC Learning VPLS is a Leyer 2 VPN technology. Becuase of its Layer 2 nature, “MAC Learning” is very important for VPLS. So, how does VPLS learn MAC Addresses? MAC Learning in VPLS is similar to normal switching MAC Learning. The concept is basic. At the beginning nobody knows the others. So, to send […]


VPLS Topologies VPLS can be defined on One Service Router or on Multiple Service Routers. Basically we can divide VPLS into two here. The first one is VPLS, that is defined on one Service Router of Service Provider, by using router ports only. As Alcatel-Lucent (Nokia) translation, this type of VPLS is done only by […]

Link Layer Discovery Protocol-Media Endpoint Discovery, LLDP-MED

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 […]

How LLDP Works, LLDP Mechanism

LLDP (Link Layer Discovery Protocol) LLDP (Link Layer Discovery Protocol) is a Standard Neighbour Discovery Protocol that is used by all vendors. Like all other Neighbour Discovery Protocols, LLDP works on Layer 2 (Data-link Layer). By using LLDP, directly connected neighbours are discovered. To discover a neighbour device, LLDP must be enabled both on the […]

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