VPLS/LPE L2VPNs: Virtual Private LAN Services using Logical PE Architecture

摘要

Consider a common network scenario in the metro area where theservice provider offers Virtual Private LAN services (VPLS)known also as Transparent LAN services (TLS) to a large numberof customers attached to low-cost Ethernet provider devices.These devices specialized mostly for Ethernet based functions(e.g., MAC learning, etc) may not have adequate resources andfunctions compared to provider devices offering large scalelayer-2 or layer-3 VPN services. Consider also the case wherethose devices are themselves attached to either switchedEthernet networks or through uplinks to other provider edgedevices, which are attached to a core IP/MPLS networkinfrastructure. The problem is how to provide a network-basedVPLS solution that scales to a large number of VPLSs, each witha large number of customer ports while at the same time the solution should be cost-effective at service provider networkedges.This draft introduces the 'Logical PE' architecture toeffectively address this problem.