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What does MPLS stands for?

MPLS stands for Multi-protocol label switching 

What is a Layer 2 MPLS VPN?

• Uses an MPLS network in the provider core to deliver Layer 2 services to the customers. 
• Uses EoSDH, IPRAN and IPCORE Backhaul for the connectivity.  
• Has Ethernet Interface (FE or GE) as connectivity to customer router.

Is MPLS an alternative to IP?

• \         No.
•          There are many, many things that MPLS can't do. It's a supplement to IP to provide additional connection oriented capabilities to the network.
•         MPLS is Layer 2.5 technology while IP is layer 3. 

What are the goals of a Layer 2 MPLS VPN?

•        A Layer 2 MPLS VPN is exactly the same as a Layer 2 VPN.
•          A Layer 2 MPLS VPN allows the use of a single network technology (namely, MPLS) to offer many services, including IP, Layer 2 VPNs, Layer 3 VPNs, MPLS traffic engineering, and Differentiated Services (DiffServ).
•          A single network architecture that offers multiple services is often referred to as a converged network.
•          A single access line to provide multiple services is also beneficial to a service provider.

What are alternate Layer 2 MPLS VPN proposals?

More than one Layer 2 MPLS VPN architecture has been under consideration by the Provider-provisioned Virtual Private Network Working Group (PPVPN WG) of the IETF. The primary proposals were known as draft-Kompella and draft-Martini, and these were the file names of the versions of those drafts as of November 2001:

■Draft-martini-l2circuit-trans-mpls-07.txt

■Draft-martini-l2circuit-encap-mpls-03.txt

■Draft-kompella-ppvpn-l2vpn-00.txt

Note:

Be sure to check the Internet Drafts http://www.ietf.org/ID.html section of the IETF Web site for updates, because the drafts change often. The answer to question number 12 explains the status of those drafts in November 2001.

When should a service provider deploy a Layer 2 MPLS VPN rather than another VPN technology?

The simplest case is when the service provider’s customer is already using a Layer 2 VPN. Migration is fairly straightforward in this case. Other situations where a Layer 2 MPLS VPN is preferable are when a service provider is using non-IP protocols or has a large number of routes in its network. An important factor to note in contrasting Layer

2 and Layer 3 MPLS VPNs is that Layer 2 MPLS VPNs usually require the provider’s customer to have more routing expertise.