Telefonaktiebolaget Lm Ericsson (publ)

Marc Rapoport

Sriganesh Kini

Hua Autumn Liu

David Sinicrope

Amarender R Musku

Michael Chen

Mike Rozhavsky

Autumn Liu

An e-tree service that includes establishing two pseudowires (PW) between edge network elements with enhanced packet forwarding is described. In one embodiment, a root PW is used for carrying packets that are sent from a root node network element, and a leaf PW is used for carrying packets that are sent from a leaf node network element in the e-tree service network. When a network element receives a packet with a destination Media Access Control (MAC) address on the logical port associated with the leaf access circuit (AC), responsive to determining that the destination MAC address corresponds to a MAC address in a MAC address table stored in the network element, and that an attribute associated with that MAC address in the MAC address table indicates the MAC address was learned from the leaf PW, the network element drops the packet.

E-tree using two pseudowires between edge routers with enhanced forwarding methods and systems

On a first network element to support rapid spanning tree protocol (RSTP) for a plurality of virtual local area networks (VLANs) in a network, receiving a packet from a second network element in the network; identifying a VLAN associated with the packet by checking for a tag in the packet; determining whether the VLAN associated with a packet is a master VLAN or a client VLAN, wherein the master VLAN and client VLAN are in a group of VLANs with identical topologies, such that a spanning tree can be maintained for the group of VLANs that are represented by the master VLAN; deriving forwarding information from the master VLAN associated with the client VLAN, in response to determining that the VLAN is a client VLAN; and forwarding the packet according to the forwarding information derived from the master VLAN, whereby separate spanning trees for each group of VLANs serviced by the first network element are efficiently maintained.

RSTP tracking

A method performed on a network element employing Multi-protocol Label Switching (MPLS) to optimize bandwidth in a ring topology network including a back-up Label Switch Path (LSP) for a protected LSP by re-routing traffic onto the back-up LSP to avoid shared links between the protected LSP and back-up LSP, including receiving a first labeled packet from another label switch router (LSR) in the back-up LSP, the first labeled packet indicating protection switch of data from the protected LSP to the back-up LSP, determining whether a shared link in the ring topology network exists between the protected LSP and the back-up LSP, rerouting traffic for the protected LSP onto an optimized back-up LSP to remove the shared link, receiving a second labeled packet indicating that a protection switch of data, and restoring routing of the traffic onto the protected LSP in response to receiving the second labeled packet.

Optimized fast re-route in MPLS ring topologies

A method performed on a network element employing Multiprotocol Label Switching (MPLS) to promulgate an alert to each Label Switch Router (LSR) along a Label Switch Path (LSP) by forwarding a labeled packet serving as an alert packet generated by an LSR in the LSP, the method including receiving the labeled packet by the network element from another LSR in the LSP, determining whether the labeled packet is the alert packet by checking a time to live value in an MPLS label header of the labeled packet, determining whether the labeled packet is an operation, administration and maintenance (OAM) packet based on a presence of a generic associated channel label, copying the labeled packet including a label stack of the labeled packet and forwarding the labeled packet to a next LSR in the LSP, whereby the latency in promulgating the alert to each of the LSRs in the LSP is reduced.

Growing community of inventors

Palo Alto, CA, United States of America

Marc Rapoport