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CONTROL PLANE CONNECTIONS OVER ASYMMETRIC CONTROL PLANE LINES

IP.com Disclosure Number: IPCOM000250074D
Publication Date: 2017-May-26

Publishing Venue

The IP.com Prior Art Database

Abstract

The present disclosure relates to an approach for creating control plane connections over asymmetric control plane links within a group, i.e., either an aggregated control plane link group or a protection application group. The approach described herein provides systems and methods where, if a link has some line(s) that are bad in the RX direction and only some of the same line(s) that are bad in the TX direction, the systems and methods use the remaining in-service line(s) together to keep the control plane up on asymmetric lines within a link. The systems and methods support an in-band control plane connection over uni-directional protection schemes (such as uni-Automatic Protection Switching (uni-APS)). Advantageously, the systems and methods allow utilization of line bandwidth in the case of uni-directional faults.

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CONTROL PLANE CONNECTIONS OVER ASYMMETRIC CONTROL PLANE LINES

ABSTRACT

The present disclosure relates to an approach for creating control plane connections over asymmetric control plane links within a group, i.e., either an aggregated control plane link group or a protection application group.  The approach described herein provides systems and methods where, if a link has some line(s) that are bad in the RX direction and only some of the same line(s) that are bad in the TX direction, the systems and methods use the remaining in-service line(s) together to keep the control plane up on asymmetric lines within a link.  The systems and methods support an in-band control plane connection over uni-directional protection schemes (such as uni-Automatic Protection Switching (uni-APS)).  Advantageously, the systems and methods allow utilization of line bandwidth in the case of uni-directional faults.

 

DETAILED DESCRIPTION

Again, the present disclosure relates to an approach for creating control plane connections over asymmetric control plane links within a group, i.e., either an aggregated control plane link group or a protection application group.  There are two categories of line failure in an optical control plane network:

•                     Bi-directional failures which are more common in metro deployments such as due to a common cause of bundle cuts.

•                     Uni-Directional Failures which are more common in longer deployments such as submarine where a bundle cut is rare and the common cause is due to an equipment failure (e.g., transponder failure).

Currently, a control plane tears down a connection in both directions for any uni-directional failure and does not distinguish in handling uni-directional line failures.

The approach described herein provides systems and methods for:

•                     If a link has some line(s) that are bad in the RX direction, and only some of the same line(s) that are bad in the TX direction, using the remaining in-service line(s) together to keep the control plane up on asymmetric lines within a link, and

•                     Supports an in-band control plane connection over uni-directional protection schemes (such as uni-Automatic Protection Switching (uni-APS)).

The approach described herein:

•                     Supports a uni-directional control plane,

•                     Detects if a line is only RX down or RX_AND_TX down by exchanging control packets. (If the line is only down in the TX direction, this is a trivial case seeing backward faults, but for line faults, without this approach, it does not know if its bi-directionally down just in the RX direction.),

•                     Use RX and TX from different physical fibers for keeping a control plane line up,

•                     Supports control plane programming datapath (switch fabric and framer) on different physical fibers for the same connection, and

•                     Supports in-band control plane over uni-directional protection applications.

Example network

FIG. 1 is a network diagram of a network 10 with various interconnected nodes 12 (illustrated as nodes 12A – 12J). ...