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MPLS Connectivity Frequently Asked Questions Overview
MPLS technology is evolving, with more services being offered using MPLS connectivity. Junos OS features are also evolving to implement these services on Juniper Networks routers.
The most common MPLS connectivity services include Virtual Private LAN Service (VPLS), Layer 3 virtual private networks (VPNs), Layer 2 circuits, and Layer 2 VPNs.
- VPLS provides a multipoint Ethernet service that emulates
an Ethernet LAN. From the customer edge (CE) perspective, the service
provider VPLS network operates like a private Ethernet broadcast domain.
A VPLS domain consists of a set of provider edge (PE) routers that acts as a single virtual Ethernet bridge for sites connected to those PE routers on the customer side. Pseudowire tunnels are created between those PE routers to aggregate traffic from one PE router to another. The PE routers exchange the MPLS labels used for the VPLS pseudowire, using either Label Distribution Protocol (LDP) forwarding equivalence classes (FECs), as described in RFC 4762, Virtual Private LAN Service (VPLS) Using Label Distribution Protocol (LDP) Signaling, or BGP, as described in RFC 4761, Virtual Private LAN Service (VPLS) Using BGP for Auto-Discovery and Signaling.
- Layer 3 VPN service is a point-to-point Layer 3 VPN network built over the service provider’s MPLS transport network. This type of service is based on RFC 2547bis, BGP/MPLS IP VPNs.
- Layer 2 circuits and Layer 2 VPNs are point-to-point Layer 2 services built over the service provider’s MPLS transport. This type of service establishes pseudowires using either LDP or BGP on the service provider core network.
This document presents the most frequently asked questions about these technologies and the features used to implement these services on Juniper Networks routers using Junos OS.
