An L2VPN provides a transparent Layer 2 transport service across a provider's network, effectively creating a virtual wire or LAN segment between customer sites. In this model, the Provider Edge (PE) routers are unaware of the customer's Layer 3 routing.

Consequently, the two Customer Edge (CE) routers, connected by the L2VPN, will see each other as if they are on the same local network segment. They will exchange OSPF Hello packets across the L2VPN and form a direct OSPF neighborship.

The OSPF process running on the PE routers is for the provider's internal IGP and is completely separate from the customer's OSPF domain. There is no OSPF interaction between the CE and PE, so their respective OSPF area configurations are independent and can be different.

A. OSPF neighborship is formed between the CEs and PEs.

This is incorrect. A CE-PE routing adjacency is a characteristic of an L3VPN, not an L2VPN where the PE is transparent to customer L3 traffic.

C. The CE and PE OSPF areas must match.

This is incorrect. Since no OSPF neighborship is formed between the CE and PE, there is no requirement for their OSPF areas to match.

1. Juniper Networks TechLibrary

Junos OS VPNs Library for Routing Devices

"Layer 2 VPNs Overview": This document states

"In a Layer 2 VPN

routing occurs on the customer's routers (called CE routers). ... The service provider's routers transparently pass the customer's traffic between the customer's sites." This supports the conclusion that CEs form a neighborship with each other (Option D) and not with the PEs (refuting Option A).

2. Juniper Networks TechLibrary

Junos OS VPNs Library for Routing Devices

"Layer 2 VPNs and VPLS Feature Guide

Layer 2 VPNs and VPLS Overview": This guide explains

"The service provider's edge routers (PEs) do not need to store or process the customer's routes. The PE routers only need to be configured to carry the traffic from the customer's site across the network." This confirms the separation between the provider's routing domain (where its OSPF area is defined) and the customer's

making their area configurations independent (supporting Option B and refuting Option C).