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

[Gyan Mishra <[e-mail]>]

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.

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/

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.

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