PCEP Extension for Fine Grain Optical Transport Network (fgOTN)

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Table of Contents

1. Introduction

As SDH phases out in operators’ networks, Fine Grain Optical Transport Network (fgOTN) technology complementing the existing OTN with an additional fgOTN path layer network is used as an alternative to carry private line services. A new fine grain ODU layer network has been defined in ITU-T to carry these signals across the OTN networks, to provide flexible N*10Mbps bandwidth TDM-based transport capabilities.¶

ITU-T has a series of recommendations for fgOTN (fine grain OTN ). The fgOTN overview is defined in [ITU-T_G.709.20], fgOTN layer architecture is defined in [ITU-T_G.872], fgOTN Interface and server adaptation is defined in [ITU-T_G.709], fgOTN equipment is defined in[ITU-T_G.798], fgOTN synchronization is defined in [ITU-T_G.8251], fgOTN management requirements is defined in [ITU-T_G.874] and protocol-neutral information model is defined in [ITU-T_G.875].¶

[RFC8779]provides the PCEP extensions required for GMPLS applications, for example, for Optical Transport Networks (OTNs) and Wavelength Switched Optical Networks (WSONs). Due to the new features of fgOTN technology, PCEP needs to be extended. The requirements were analyzed in [I-D.draft-han-pce-path-computation-fg-transport].¶

2. Requirements on the PCEP computed path information

For each computed fgOTN path, the information carried by the PCEP should at least include: 1) fgOTN path information 2) fgOTN path protection type 3) Path role (working path/backup path) 4) fgOTN path bandwidth 5) fgOTN path list: a) node identifier b) Path identifier¶

3. PCEP Extention for fgOTN path set-up

The centralized computation model of PCE architecture seems to be suitable for the fine-granularity transport network, while the PCEP (PCE communication protocol) needs to be extended to meet the fine-granularity transport requirements.¶

The protocol and signaling should support the application of fine-granularity path set-up/update/removal and resource management.¶

The extention for fgOTN path set-up is suggested as follows:¶

4. Manageability Considerations

<Add any manageability considerations>¶

5. Security Considerations

<Add any security considerations>¶

6. IANA Considerations

<Add any IANA considerations>¶

Acknowledgments

Authors' Addresses