A layer 3 MPLS VPN, also known as L3VPN, combines enhanced BGP signaling, MPLS traffic isolation and router support for VRFs (Virtual Routing/Forwarding) to create an IP based VPN. Compared to other types of VPN such as IPSec VPN or ATM, MPLS L3VPN is more cost efficient and can provide more services. Layer 3 MPLS VPNs are characterized by fully meshed architectures that enable, for instance, multicast conferencing in support of projects involving a dispersed work group.
Some businesses like the Layer 3 options that are available now because the service provider takes over all the WAN routing. Outsourcing of routing tables is also seen as a weakness of Layer 3 VPN services because many corporations don't want to relinquish control or even share their routing schemes with anyone, not even their service provider. They prefer Layer 2 network services that are simpler in architecture and that allow customers to retain control of their own routing tables
Showing posts with label VPN. Show all posts
Showing posts with label VPN. Show all posts
Sunday, September 27, 2009
Layer 2 MPLS VPN
A Layer 2 MPLS VPN is a method that Internet service providers use to segregate their network for their customers, to allow them to transmit data over an IP network. This is often sold as a service to businesses. Layer 2 VPNs are a type of Virtual Private Network (VPN) that uses MPLS labels to transport data. The communication occurs between routers that are known as Provider Edge routers (PEs), as they sit on the edge of the provider's network, next to the customer's network.
BGP-based
The BGP-based type is based on a draft specification by Kireeti Kompella, from Juniper Networks. It uses the Border Gateway Protocol (BGP) as the mechanism for PE routers to communicate with each other about their customer connections. Each router connects to a central cloud, using BGP. This means that when new customers are added (usually to new routers), the existing routers will communicate with each other, via BGP, and automatically add the new customers to the service.
LDP-based
The second type is based on a draft specification by Vach Kompella (Alcatel-Lucent). This method is also known as a Layer 2 circuit. It uses the Label Distribution Protocol (LDP) to communicate between PE routers. In this case, every router will connect to every other router in the VPN, which differs from the BGP-based methodology.
Juniper Networks : LDP / BGP based (M/T/J/E-series)
Cisco Systems : LDP-based
BGP-based
The BGP-based type is based on a draft specification by Kireeti Kompella, from Juniper Networks. It uses the Border Gateway Protocol (BGP) as the mechanism for PE routers to communicate with each other about their customer connections. Each router connects to a central cloud, using BGP. This means that when new customers are added (usually to new routers), the existing routers will communicate with each other, via BGP, and automatically add the new customers to the service.
LDP-based
The second type is based on a draft specification by Vach Kompella (Alcatel-Lucent). This method is also known as a Layer 2 circuit. It uses the Label Distribution Protocol (LDP) to communicate between PE routers. In this case, every router will connect to every other router in the VPN, which differs from the BGP-based methodology.
Juniper Networks : LDP / BGP based (M/T/J/E-series)
Cisco Systems : LDP-based
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