Telefonaktiebolaget Lm Ericsson (publ)

Alessio Giorgetti

Piero Castoldi

Filippo Cugini

Giulio Bottari

Nicola Sambo

Isabella Cerutti

Francesco Paolucci

Luca Valcarenghi

Andrea Sgambelluri

Traffic recovery is supported at a switching node () of an OpenFlow network (). The switching node () has a flow table () for storing flow entries () which determine forwarding of received packets between the ports. A switching node () installs () a flow entry for a back up path in the flow table (). The switching node () renews () the flow entry for the backup path based on at least one of: (i) an association between the flow entry for the backup path and a flow entry for a working path at the switching node, wherein the flow entry for the backup path is renewed when the flow entry for the working path is used to forward a received packet; (ii) receiving a flow entry renewal packet from another switching node on the backup path. A backup path can be configured for each of multiple points of failure in the working path.

Traffic recovery in openflow networks

A method of restoration for an optical network, the network comprising a plurality of nodes () interconnected with each other by optical links (), a subset of the nodes () each comprising a regenerator, the method comprising: storing) a quality of transmission parameter and a regenerator availability at each of the plurality of nodes (); notifying () a branch node () in response to detecting a failure () within a link () forming part of the path between a source node () and a destination node (), wherein the branch node () is the neighbouring upstream node () upstream of the link failure (), the branch node () having a regenerator; the branch node () computing () a restoration segment () to a merge node () having a regenerator which is a neighbouring downstream node which is downstream of the link failure (), the restoration path () being based on the quality of transmission parameter and regenerator availability information; restoring () the path between the source node () and the destination node () using the restoration segment ().

Restoration scheme for an optical network and method of using such a scheme

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Pisa, Italy

Alessio Giorgetti