CE device—customer edge device. A device on the border between a VPN provider and a VPN customer that belongs to the customer.
LSR—label switching router. A device that forwards MPLS packets based on the value of a fixed-length label encapsulated in each packet.
MPLS—Multiprotocol Label Switching. A method for forwarding packets (frames) through a network. It enables devices at the edge of a network to apply labels to packets (frames). ATM switches or existing devices in the network core can switch packets according to the labels with minimal lookup overhead.
MPLS VPN—Multiprotocol Label Switching Virtual Private Network. An IP network infrastructure delivering private network services over a public infrastructure using a Layer 3 backbone. Using MPLS VPNs in a Cisco network provides the capability to deploy and administer scalable Layer 3 VPN backbone services including applications, data hosting network commerce, and telephony services to business customers.
PE device—provider edge device. A device on the border between a VPN provider and a VPN customer that belongs to the provider.
VPN—Virtual Private Network. A group of sites that, as the result of a set of administrative policies, are able to communicate with each other over a shared backbone network. A VPN is a secure IP-based network that shares resources on one or more physical networks. A VPN contains geographically dispersed sites that can communicate securely over a shared backbone.
See also MPLS VPN.
VRF—VPN routing and forwarding instance. A VRF consists of an IP routing table, a derived forwarding table, a set of interfaces that use the forwarding table, and a set of rules and routing protocols that determine what goes into the forwarding table. In general, a VRF includes the routing information that defines a customer VPN site that is attached to a PE device.