RFMPLS vs VPLS: Understanding the Key Differences
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This article compares MPLS (Multiprotocol Label Switching) and VPLS (Virtual Private LAN Service), highlighting the differences between the two technologies.
MPLS - Multiprotocol Label Switching
MPLS stands for Multiprotocol Label Switching.
As the name suggests, MPLS is a method of forwarding data packets based on labels. An MPLS network typically consists of Customer Edge (CE) routers and Provider Edge (PE) routers, as shown in Figure 1 (not included here, see link above). For more in-depth information, refer to MPLS tutorials and resources on BGP and MPLS in VPNs.
VPLS - Virtual Private LAN Service
VPLS stands for Virtual Private LAN Service.
Defined in RFC 4762, VPLS is an architecture that delivers Ethernet Multipoint Services (EMS) over an MPLS network. Figure 2 (linked above) illustrates the typical VPLS architecture.
- VPLS operation emulates an IEEE Ethernet bridge.
Similar to MPLS-based IP VPN services, VPLS-based VPNs are multipoint services. However, unlike IP VPNs, VPLS can transport non-IP traffic. Here are some key features of VPLS-based VPNs (Virtual Private Networks):
- It’s a Layer 2 multipoint VPN.
- It allows multiple sites to be connected in a single bridged domain over a provider-managed IP MPLS network.
- All customer sites within the VPLS-based VPN appear to be on the same LAN, regardless of their actual geographic location.
- It uses Ethernet interfaces, eliminating traditional LAN and WAN boundaries, and enabling rapid and flexible provisioning.
Key Components of a VPLS Network
There are three main components in a VPLS network:
- CE Devices (Customer Edges): These are router or switch devices located at the customer’s premises.
- PE Devices (Provider Edges): This is where the core intelligence of the VPN network resides. All PEs are interconnected, and CEs connect with their peer PEs.
- MPLS Network: All PEs are connected via an MPLS IP network. Traffic is switched based on MPLS labels. Refer to resources on MPLS label switching for further details.
