[Nsi-wg] tomorrow's NSI conf call

[Inder Monga]

Artur,

Thanks for providing an update. I like the two states at the bottom that clarify what happens when the Cancel message is received. I have a few clarifications:

1. For the last state transitioning from ANY - Canceling - Terminating. 
	- Ideally, the intermediate RA would send a Cancel message to the downstream PA and then release the resources and reservation without waiting for a release confirm?
	- Do we really need at the intermediate PA to wait to hear Rel_conf from all the downstream nodes before sending our own?

2. I missed the discussion for the two new states (Auto-start and Idle) - and really did not see this discussion in last week's minutes? Can you provide more insight why these are necessary? I do understand that they may clarify how you would do each feature like auto start vs manual start, but does it really need a different state?

3. From the state machine, the only way the circuit will come out of "In Service" state to "Idle" is when RA sends an explicit release message? There is no timer for the aforementioned state transition. Timer expiry is always the expiry of the reservation?

4. Any communication timeout (for example after sending 3 messages or so without getting an ack back) should result in the PA communicating upstream and releasing the connection unless there is a catastrophic failure?


Thanks,
Inder

On Jan 18, 2011, at 11:55 PM, Artur Barczyk wrote:

> Hi Guy, All,
> 
> unfortunately I won't be able to attend today's
> call. For the discussion, I attach the latest state
> diagram V2, i.e. with the idle state back in.
> 
> To make the picture clearer, I separated out
> the transitions due to Cancel request and End of
> reservation - these can occur from any state, it
> would just make the picture less readable. Instead,
> they are shown in the lower part of the diagram as
> transitions from "Any" state.
> 
> Jerry, I did not after all include "Init" and "Terminated"
> states - I'd like to understand better (and discuss) the
> necessity of these. (Not a silent drop :-) )
> 
> I apologize I cannot participate in the discussion
> today, but will be happy to receive comments and
> read the minutes...
> 
> Best regards,
> Artur
> 
> 
> On 01/18/2011 06:21 PM, Guy Roberts wrote:
>> Hi all,
>> 
>> 
>> 
>> The following is dial-in information for Wednesday's NSI call, time: 
>> 7:00 PDT  10:00 EDT, 15:00 GMT,  16:00 CET,  24:00 JST
>> 
>> 
>> 
>> 1. Dial Toll-Free Number: 866-740-1260 (U.S. & Canada) 2. International
>> participants dial: Toll Number: 303-248-0285  Or International Toll-Free
>> Number: http://www.readytalk.com/intl 3. Enter 7-digit access code 
>> 8937606, followed by “#”
>> 
>> 
>> 
>> Agenda:
>> 
>> Ongoing NSI protocol and state machine discussion.
>> 
>> 
>> 
>> Guy
>> 
>> 
>> 
>> 
>> 
>> _____________________________________________________________________
>> 
>> 
>> 
>>      **       Guy Roberts, PhD     Network Engineering & Planning
>> 
>>    *    *                          Tel:    +44 (0)1223 371300
>> 
>>   *      *    City House           Direct: +44 (0)1223 371316
>> 
>>   *           126-130 Hills Road   Fax:    +44 (0)1223 371371
>> 
>>  *            Cambridge
>> 
>>  *            CB2 1PQ              E-mail: guy.roberts at dante.net
>> <mailto:guy.roberts at dante.org.uk>
>> 
>>  D A N T E    United Kingdom       WWW:    http://www.dante.net
>> 
>> _____________________________________________________________________
>> 
>> 
>> 
>> 
>> 
>> _______________________________________________
>> nsi-wg mailing list
>> nsi-wg at ogf.org
>> http://www.ogf.org/mailman/listinfo/nsi-wg
> 
> -- 
> Dr Artur Barczyk
> California Institute of Technology
> c/o CERN, 1211 Geneve 23, Switzerland
> Tel:    +41 22 7675801
> <CS_statemachine V2 20110116.jpg>_______________________________________________
> nsi-wg mailing list
> nsi-wg at ogf.org
> http://www.ogf.org/mailman/listinfo/nsi-wg

---
Inder Monga
imonga at es.net