[Nsi-wg] FW: minutes from yesterday's NSI conf. call

[Guy Roberts]

Hello All,

The minutes from yesterday's call are available here:
http://forge.gridforum.org/sf/go/doc15958?nav=1

I have attached the latest version of the architecture deliverable.  This incorporates contributions and comments by Tomohiro Kudoh, Joan Garcia, John Vollbrecht as well as some contributions by myself.

To bring some clarity to the complex discussions on advanced reservation, I have created the following table to try and summarize the questions that I think were raised in yesterday's discussion.  2 options as are proposed for each question.  The solutions described in the existing architecture deliverable is also included.

Guy


Question

Option 1

Option 2

Existing v1.0 solution as proposed by TK

Comments

1 or 2 phase commit?

1PC

2PC

1PC

2PC is more deterministic for multiple network situation

Is reservation guard-band required in 1PC?

Yes

No

Yes

For timer initiated provisioning with 1PC, the guard-band is required to prevent partial provisioning of a connection.

Is reservation guard-band required in 2PC?

Yes

No

NA

In practice to improve reliability of service, 2 should be aware of the worst-case reservation times.

Who adds Reservation guard-band?

Added by Requester NSA

Added by Provider NSA

?

This decision affects how the StartTime field in message is interpreted.  Also GB definition will change based on this usage.  (see below)

Is reservation guard-band (GB) implemented per-network, or for federation of networks?

GB = worst case reservation time for local network

GB = worst case reservation time for all participating networks

?

If the GB is added by the Requester, then the GB should refer to the worst-case time for the federation of participating networks.

Provider validation of guard-band?

Validated

Not validated

Validated



Provisioning advance time

None

Advance time added by Provider NSA

None

The advance time should be set to equal the worst case provisioning time.  This is needed if the In-service time is to match the user requested time.

Synchronization

NTP

GPS/radio

?

NTP should be ok

Separate command for immediate reservation?

Yes

No

No

How is immediate reservation distinguished from advanced?  This can probably be done by using 'ASAP' in the startTime field.

Allow ASAP as start-time?

Yes

No

No



How is provisioning initiated with ASAP startTime?

Signalled from Requester NSA

Initiated by timer on Provider NSA

NA

To get a fast result with ASAP then timer initiated provisioning could be used.  (is this much faster than signalled?)

How should provisioning be initiated for advanced reservations?


Signalled from Requester NSA

Initiated by timer on Provider NSA

Both options supported

In the case of 1PC and not guard-time, the outcome when initiated by timer on Provider may not be very deterministic.

Does each Connection request need a field to indicate how to expect provisioning to be initiated?

Provisioning type field

No provisioning type field

?

How does Provider know whether to wait for signal from Requester?


------------------------------------------------------------------------------------------------------------------
Guy  Roberts,  Ph.D

Network Engineering & Planning
DANTE - www.dante.net<http://www.dante.net/>
Tel: +44 (0)1223 371 316
City House, 126-130 Hills Road
Cambridge, CB2 1PQ, UK
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