[spring] Re: My question at the mike about draft-dong-spring-srv6-inter-layer-programming

["Dongjie (Jimmy)" <[e-mail]>]

Hi Gyan,

Thanks for your interest in this topic, and the introduction of the POI work in CCAMP is helpful.

Please see some replies inline:

From: Gyan Mishra [mailto:[e-mail]]
Sent: Monday, July 29, 2024 3:50 PM
To: Dongjie (Jimmy) <jie.dong=[e-mail]>
Cc: Ketan Talaulikar <[e-mail]>; Alexander Vainshtein <Alexander.Vainshtein=[e-mail]>; [e-mail]; [e-mail]; Oscar González de Dios <[e-mail]>
Subject: Re: [spring] Re: My question at the mike about draft-dong-spring-srv6-inter-layer-programming

Hi Jie

I have a draft in CCAMP on POI IP + Optical convergence where we are focused on operator use cases for coherent pluggable optics that is being developed by lead author Oscar Dios (Teas chair).

Does this describe what you are trying to do with SRv6 inter layer programming does seem like POI IP + Optical convergence.

[Jie] As described in this draft, POI is one use case of SRv6 inter-layer programming.

This work uses the CS-SR Circuit Style SR for provisioning being progressed by Christian Schmutzer which can be over SR-MPLS or SRv6.

https://datatracker.ietf.org/doc/draft-schmutzer-spring-cs-sr-policy/
[Jie] To my understanding CS-SR is a another story, which is about using SR based packet network to emulate circuit-style connections.


There are two new very powerful use cases which are exposed with POI when IP and Optical layers are being converged and that is that now with POI we can p2p DWDM links between router nodes that are now acting as DWDM switch as well with  Routed Optical Networking termed  "RON" with IP and Optical convergence. These use cases do not exist with legacy Optical OTN with gray optics and external transponders which is one of the major benefits of POI IP+Optical convergence

https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01

With this work we have tremendous scale as now each p2p link with coherent pluggable optics and now having access to all the layers with IP+Optical with a Hierarchial controller superset controller talking to the IP and Optical layers for provisioning as well as can have very long spans with tweaking of the alien wavelengths and amplitude modulation schemes.

With POI a p2p link with each router being a DWDM switch each wavelength could be 100G/400G/800G x 96 wavelengths so a single SMF fiber can now have up to 100G/400G/800G x 96 scalable bandwidth on demand which is applicable to MSDC DCI interconnects and Converged Core transport networks.

[Jie] Thanks for sharing the use cases of IP+optical pluggable, I will take a further look at it. I agree this draft could be applicable to the use cases of pluggable, and it can also be applied to other IP and Optical integration cases without pluggable.


Best regards,
Jie


This exists today and is supported by a few vendors but now we are trying to standardize the implementation use cases with coherent pluggable optics with this CCAMP draft.

See section 4.2 Scenario-A High Capacity P2P  and 4.3 Scenario-B  High Capacity P2P over shared fiber

4. <https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#section-4> Network Scenarios<https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#name-network-scenarios>

This section provides a set of packet over optical network scenarios, starting with the most common ones.¶<https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#section-4-1>

4.1. <https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#section-4.1> Scenario A - High capacity point to point connection over dedicated direct fiber<https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#name-scenario-a-high-capacity-po>

As depicted in Figure 4<https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#_figure-topo1>, this scenario considers a point-to-point optical service over a short distance (e.g., up to 100 km) using dedicated fiber.¶<https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#section-4.1-1>

Note that there is no amplification and no protection in this scenario.¶<https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#section-4.1-2>

    Packet                                                             Packet

    Device A                                                           Device B

    +----+             IP Link (between Router Ports)                  +----+

    |    |.............................................................|    |

    |    |                                                             |    |

    |    |             Optical Service (Plug-to-Plug)                  |    |

    |    |    .....................................................    |    |

    |  |------|                                                   |------|  |

    |  |      |                                                   |      |  |

    |  |Plug A|===================================================|Plug B|  |

    |  |      |                                                   |      |  |

    |  |------|                                                   |------|  |

    |    |                                                             |    |

    +----+                                                             +----+
Figure 4<https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#figure-4>: Network topology with dedicated direct fiber<https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#name-network-topology-with-dedic>
4.2. <https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#section-4.2> Scenario B - High capacity point to point over shared fiber<https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#name-scenario-b-high-capacity-po>

This scenario extends Figure 4<https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#_figure-topo1> by making more efficient use of the deployed fiber infrastructure.¶<https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#section-4.2-1>

As shown in Figure 5<https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#_figure-topo2>, this scenario considers a point-to-point optical service over a short distance (e.g., up to 100 km) using a physical optical network with DWDM filters and amplifiers. Several point-to-point connections can be multiplexed from the same packet devices.¶<https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#section-4.2-2>

Note that there is no protection in this scenario.¶<https://datatracker.ietf.org/doc/html/draft-poidt-ccamp-actn-poi-pluggable-usecases-gaps-01#section-4.2-3>

    Packet                                                             Packet

    Device A                                                           Device B

    +----+             IP Link (between Router Ports)                  +----+

    |    |.............................................................|    |

    |    |                                                             |    |

    |    |             Optical Service (Plug-to-Plug)                  |    |

    |    |    .....................................................    |    |

    |  |------|                                                   |------|  |

    |  |      |      |-------|      |-------|      |-------|      |      |  |

    |  |Plug A|======| Filter|======|  AMP  |======| Filter|======|Plug B|  |

    |  |      |  ||==|       |      |       |      |       |==||  |      |  |

    |  |------|  ||  |-------|      |-------|      |-------|  ||  |------|  |

    |    |       ||                                           ||       |    |

    +----+       ||                                           ||       +----+

                 ||                                           ||

       |------|  ||                                           ||  |------|

       |      |==||                                           ||==|      |

       |Plug C|                                                   |Plug D|

       |      |                                                   |      |

       |------|                                                   |-----