What Is VPLS?
VPLS is a class of VPN or Virtual Private Network that connects multiple sites to form a single bridged domain. It is implemented using a MPLS or Multi-Protocol Label Switching Network. That makes it protocol-transparent so that all services, regardless of which location the are physically located at, appear to be on the larger LAN that serves all locations.
What is a Service Level Agreement?
An SLA or Service Level Agreement is often part of the contract
between a business and telecom carrier for line or network services.The SLA spells out the expected availability
of the service and what penalties the carrier is liable for downtime or parameters out of spec.
Transparent LAN Service
VPLS is sometimes called Transparent LAN service. That’s because WAN communications moves from level 3 to level 2. Your connection to the network is via a managed edge switch that is provided by the network operator. The inherent broadcast nature of Ethernet is preserved, creating a “plug and play” environment as new services are added to the network and discovered by other members connected to the VPLS.
Can MPLS Offer VPN Services?
MPLS networks are inherently virtually private because they are a privately operated network that can only be accessed by network customers. Security is enhanced by proprietary tag switching routers that don't use standard IP routing. Encryption can be added to further improve data security.
How MPLS Connections Are Defined
You specify the types of connections you want and the network provider sets up the label switching routers to provide this specific service. If you need to add locations or change the way you want to connect, there are no wiring changes that need to be made. The network provider will simply reprogram your service to meet your new specifications.