CCAMP Working Group R. Rao
Internet-Draft I. Hussain
Intended status: Informational R. Valiveti
Expires: September 8, 2017 Infinera Corporation
Q. Wang, Ed.
Y. Zhang
H. Helvoort
Hai Gaoming B.V
March 7, 2017

Traffic Engineering Extensions to OSPF for GMPLS Control of Beyond-100G G.709 Optical Transport Networks


This document describes Open Shortest Path First - Traffic Engineering (OSPF-TE) routing protocol extensions to support GMPLS control of Optical Transport Networks (OTNs) specified in ITU-T Recommendation G.709 published in 2016. The 2016 version of G.709 [ITU-T_G709_2016] introduces support for higher rate OTU signals, termed OTUCn (which have a nominal rate of 100n Gbps). The newly introduced OTUCn represent a very powerful extension to the OTN capabilities, and one which naturally scales to transport any newer clients with bit rates in excess of 100G, as they are introduced. This document extends the mechanisms defined in [RFC7138].

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Table of Contents

1. Introduction

The current GMPLS routing extensions RFC [RFC7138] includes coverage for all the OTN capabilities that were defined in the 2012 version of G.709 [ITU-T_G709_2012]. The 2016 version of G.709 [ITU-T_G709_2016] introduces the following key extensions:

  1. OTUCn signals with bandwidth larger than 100G (n*100G)
  2. ODUCn signals with bandwidth larger than 100G.
  3. ODUflex signals with bandwidth larger than 100G
  4. mapping client signals with bandwidth larger than 100G into the corresponding ODUflex containers.
  5. Tributary Slot Granularity of 5G

This document provides extensions required in GMPLS OSPF-TE for B100G OTN technology. For a short overview of OTN evolution and implications of B100G on GMPLS routing, please refer to [I-D.zih-ccamp-otn-b100g-fwk].

1.1. Terminology

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

2. OSPF-TE Extensions

As discussed in [I-D.zih-ccamp-otn-b100g-fwk], OSPF-TE must be extended to advertise the termination, Switching and multiplexing Capabilities for ODUCn and OTUCn (Optical Transport Unit) links. These capabilities are carried in the Switching Capability specific information field of the Interface Switching Capability Descriptor (ISCD) using formats defined in this document.

3. TE-Link Representation

G.709 ODUCn/OTUCn links are represented as TE-Links in GMPLS Traffic Engineering Topology for supporting ODUj layer switching. These TE-Links can be modeled in multiple ways. Figure 1 below provides an illustration of one-hop OTUCn TE-Links.