[CCAMP] Comments on draft-sambo-ccamp-yang-fsm-transponder-reconf-00

[Dieter Beller <[e-mail]>]

Hi Nicola,

as there was no time left for providing my comments at the end of the 
CCAMP session this morning, I am providing my comments by e-mail:

Are you assuming that the FSM is running autonomously on the optical 
transponder? What are the events that  trigger state transitions?
I understood that there are local events that the optical transponder 
creates and there can also be external events coming from an SDN 
controller for example.

Slide 6 only shows half of the picture: when the FSM of an OT decides to 
change its state, the remote transponder has to do exactly the same 
state transition.
If the two transponders terminating the optical signal are not 
configured consistently, no traffic can be carried across the optical 
path. This means that state
changes require coordination between the two optical transponders. How 
is this accomplished such that the service disruption time is minimized?

Slide 6 shows an example where the modulation scheme is changed from 
16-QAM to QPSK. This reduces the data rate of the traffic to 50% (from 
200Gbps
to 100Gbps for example). I suppose that the traffic that can be dropped 
must be best effort traffic.

These network operations issues need to be addressed in the draft for 
this specific optical transponder FSM use case. Otherwise, its 
applicability is doubtful.


Thanks,
Dieter