Browse Prior Art Database

OPTICAL TRANSPORT NETWORK LABEL SWITCHED PATH SEGMENT RESTORATION

IP.com Disclosure Number: IPCOM000253600D
Publication Date: 2018-Apr-16
Document File: 18 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Related People

Praveen Kumar: AUTHOR [+2]

Abstract

Current day Generalized Multiprotocol Label Switching (GMPLS) Optical Transport Network (OTN) restoration is an end-to-end mechanism with complete end-to-end path creation, tear down, and restoration options. The techniques described herein instead perform a segment based deletion and restoration on top of the existing end-to-end Label Switched Path (LSP). This provides improved switch times and faster convergence.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 11% of the total text.

Copyright 2018 Cisco Systems, Inc. 1

OPTICAL TRANSPORT NETWORK LABEL SWITCHED PATH SEGMENT RESTORATION

AUTHORS:

Praveen Kumar Navdeep Sood Ankur Govil

CISCO SYSTEMS, INC.

ABSTRACT

Current day Generalized Multiprotocol Label Switching (GMPLS) Optical

Transport Network (OTN) restoration is an end-to-end mechanism with complete end-to-

end path creation, tear down, and restoration options. The techniques described herein

instead perform a segment based deletion and restoration on top of the existing end-to-end

Label Switched Path (LSP). This provides improved switch times and faster convergence.

DETAILED DESCRIPTION

As demand for bandwidth for Internet and other services continues to increase,

service providers (e.g., Internet Service Providers) have ever growing requirements for

increasing the bandwidth per fiber. Meanwhile, there is an immense pressure to increase

the network resiliency to prevent failures due to fiber cuts, site power outages, etc. The

protection schemes deployed in initial Time-Division Multiplexing (TDM) networks were

either span level or ring level protections such as Automatic Protection Switching (APS)

for linear protection or (Bidirectional Line Switched Ring) BLSR for ring architectures.

The newer generation of Optical Transport Networks (OTNs) are mesh networks where

more efficient and reliable mesh restoration capabilities are required to ensure carrier class

performance of TDM equipment. This has given rise to the latest generation of TDM based

OTN equipment, which support Generalized Multiprotocol Label Switching (GMPLS)

based control planes for efficient mesh restoration on TDM networks / OTNs.

In a pure Internet Protocol (IP) based network world, MPLS networks traditionally

provide capabilities to encapsulate different kind of protocols using labels (e.g., for

Asynchronous Transfer Mode and IP). The Multiprotocol Label Switching (MPLS)

architecture has been defined to support the forwarding of data based on a labels. The

Copyright 2018 Cisco Systems, Inc. 2

Traffic Engineering (TE) portion of MPLS uses tables to provide efficient Quality of

Service (QoS). This end-to-end path established in MPLS-TE is referred to as a Label

Switched Path (LSP).

The original MPLS architecture has been extended to include Label Switch Routers

(LSRs) whose forwarding plane recognizes neither packets nor cell boundaries, and

therefore cannot forward data based on the information carried in either packet or cell

headers. Specifically, such LSRs include devices where the forwarding decision is based

on time slots, wavelengths, or physical ports. Given this, LSRs (or more precisely

interfaces on LSRs) can be subdivided into the following four classes:

1. Interfaces that recognize packet/cell boundaries and can forward data based on the

content of the packet/cell header. Examples include interfaces on routers or ATM.

Such interfaces are referred to as Packet-Switch Capable (PSC).

2. Interfaces that forward data based on the data time slo...