Patent ID: 8971190
Filing Date: 2015-03-03
Classification: H04L

Abstract:
1. A method for implementing Shortest Path Bridging (SPB) over a Virtual Private LAN Service (VPLS) network, comprising: receiving, by a provider edge (PE) switch, Intermediate System-Intermediate System (IS-IS) protocol data unit (PDU) information; determining, from the received IS-IS PDU information, whether a Designated Forwarder (DF) configuration for the PE switch needs to be changed and, if the DF configuration needs to be changed, the method further comprising: determining whether the PE switch remains a DF for one or more Backbone-Virtual Local Area Network Identifiers (B-VIDs) and, if the PE switch is no longer a DF for one or more B-VIDs, the method further comprising: removing all local DF associated information from at least one pseudowire (PW) adjacency's Label Distribution Protocol (LDP) database associated with the PE switch, and removing, from a local IS-IS database, all DF associated remote LDP information for a set of remote Provider Backbone Bridged Networks (PBBNs) associated with the PE switch; and determining whether the PE switch has become a DF for one or more of the B-VIDs and, if the PE switch has become a DF for one or more of the B-VIDs, the method further comprising: adding, from the IS-IS database, all local DF information for the PE switch to the at least one pseudowire (PW) adjacency's LDP database, and adding, from the at least one pseudowire (PW) adjacency's LDP database, all DF associated remote Shortest Path Bridging MAC Mode (SPBM) information for the PE switch to the IS-IS database.