Patent ID: 9036644
Filing Date: 2015-05-19
Classification: H04L

Abstract:
1. A method for provisioning a loop free Hierarchical Virtual Private LAN Service (H-VPLS) traffic service in a multi-domain multi protocol label switching (MPLS) network, where the domains are interconnected there-between, the method comprising: provisioning pseudo wires (PWs) for Multi-Point-to-Multi-Point (MPTMP) services in each domain of said multi-domain MPLS network; defining multiple Split Horizon Groups (SHGs) in the network, wherein each SHG corresponds to a domain, for said H-VPLS service traffic and for each specific node of the multi-domain MPLS network, automatically assigning indications to the SHGs and the pseudo wires connected to said specific node, wherein the same indication is assigned to all pseudo wires belonging to the same Split Horizon Group number (SHG-N), and wherein said step of assigning is characterized in that when traffic belonging to H-VPLS service crosses a border network node located between two interconnected domains, the SHG-N indication of PWs remains the same within a Virtual Private LAN Service (VPLS) domain, thereby preventing the service traffic from returning to the same domain from which it had been conveyed.