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MULTI-NODE LINEAR PROTECTION IN PACKET NETWORKS WITH NODE RESILIENCY AND LOOP PREVENTION

IP.com Disclosure Number: IPCOM000250019D
Publication Date: 2017-May-16
Document File: 9 page(s) / 310K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present disclosure relates to multi-node linear protection in packet networks. The solution provides a way to connect two networks across two head-end nodes so that if one head end node fails, the traffic signal can switch over to the other node. The configuration between the two head-end nodes utilizes ITU-T G.8031 for protection switching and transport entity health. The use of a point-to-point service at the tail end prevents the possibility of the traffic signal looping.

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MULTI-NODE LINEAR PROTECTION IN PACKET NETWORKS WITH NODE RESILIENCY AND LOOP PREVENTION

ABSTRACT

The present disclosure relates to multi-node linear protection in packet networks.  The solution provides a way to connect two networks across two head-end nodes so that if one head end node fails, the traffic signal can switch over to the other node.  The configuration between the two head-end nodes utilizes ITU-T G.8031 for protection switching and transport entity health.  The use of a point-to-point service at the tail end prevents the possibility of the traffic signal looping.

 

DETAILED DESCRIPTION

Again, the present disclosure relates to multi-node linear protection in packet networks.  The solution includes handing-off and transporting traffic between networks to an end user with node resiliency and loop prevention.

The solution provides a way to connect two networks across two head-end nodes so that if one head end node fails, the traffic signal can switch over to the other node.  The configuration between the two head-end nodes utilizes ITU-T G.8031 “Ethernet linear protection switching” (01/15), the contents of which are incorporated by reference, for protection switching and transport entity health.  The use of a point-to-point service at the tail end prevents the possibility of the traffic signal looping.

Currently, G.8031 is a node endpoint to node endpoint solution where the working transport entity and the protection transport entity take different paths through the network, but the head end endpoint resides on the same node and thus will not recover from an entire node failure.  This solution allows the working transport entity and the protection transport entity to reside on different head-end nodes and thereby provide protection against total node failures.  The solution uses the Remote Defect Indication (RDI) bit to indicate state status between state machines.  Also, the solution does not require one network to switch when the other one switches.  The solution uses the active/standby state of inter-network transport entities for protection event decisions that keep the normal traffic signal up.

The solution describes a protection scheme whose protection domain entails a multipoint head end and a single point tail end to build upon the existing G.8031 standard.  The tail end node follows the G.8031 standard and is unchanged.  The two head-end nodes have the G.8031 functionality split across them as a pair of Multi-Node Protection Groups (MN-PG).  In addition to G.8031 attributes, each MN-PG has these attributes: protection role, multi-node protection group identifier, and service tag.  An MN-PG differs from G.8031 in that it has an inter-link entity instead of a protection entity.  The attribute protection role accepts the values working and protection.  The configuration of the protection role decides which state machine is instantiated on that head end.  The attribute multi-node protection group identif...