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1. (WO2013160786) THREE STAGE FOLDED CLOS OPTIMIZATION FOR 802.1AQ

Pub. No.:    WO/2013/160786    International Application No.:    PCT/IB2013/052862
Publication Date: Fri Nov 01 00:59:59 CET 2013 International Filing Date: Fri Apr 12 01:59:59 CEST 2013
IPC: H04L 12/721
H04L 12/937
Applicants: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
Inventors: ALLAN, David Ian
Title: THREE STAGE FOLDED CLOS OPTIMIZATION FOR 802.1AQ
Abstract:
A three stage folded Clos network is used for Ethernet routing with improved efficiency for computational complexity, network administration, multicast addressing and load redistribution upon failure. The network includes an array of root nodes coupled to an array of edge nodes. Forwarding states are computed and installed for spanning trees rooted on the root nodes. When an edge node is identified as having a failed connection to a root node, a shortest path first (SPF) tree rooted on that edge node is constructed for each Backbone VLAN identifier (B-VID) for the spanning trees rooted on that root node and use the failed connection. A filtering database in each node is populated for edge node pairs having a common service identifier, and unicast and multicast data are forwarded between the edge node pairs according to the filtering database via the SPF trees using a hybrid multicast addressing.