- Nsi-wg - lists.ogf.org

Issue 55 in ogf-nsi-project: correlationId is unneeded and complicates implementation significantly
by ogf-nsi-project＠googlecode.com 01 Apr '13

01 Apr '13

Status: Accepted Owner: ---- Labels: Type-Review Priority-Medium FoundInVersion-1.0 FixedInVersion-1.1 New issue 55 by thost...(a)gmail.com: correlationId is unneeded and complicates implementation significantly http://code.google.com/p/ogf-nsi-project/issues/detail?id=55 Description of Issue: The correlationId attribute in the WSDL messages is unneeded. Furthermore it requires correct implementations to persistently keep track of the correlationsIds of active requests. Discussion of Issue: The WSDL adds a correlationId to track the correspondence between a request and the subsequent update for the status. However this correspondence is unneeded as the request already contains information about the connection in question. However having the correlationId requires both the requester and provider to keep a persistent (as in on-disk) record of currently active requests, in order to be crash and restart safe, i.e., the service must be able to respond to requests that came before it crashed/restarted. The correlationId also means that state updates are not idempotent as the client can only receive a request (state update) once. However it cannot be guaranties that a message with a state update will only be send once due to the coordination of message dispatching and updating this information persistently, where there will always be a window which can lead to inconsistency, where the message must be retransmitted. Having to keep track of requests in this way, is called a state-full protocol (note that this does not mean a non state-full protocol doesn't have any state), and is usually considered a bad idea do implementation complexity and poor scalability in high-performance systems (arguably this is not what we have though), as it makes load balancing and redundancy significantly more tricky. Furthermore it must be remembered that not all requests will have a callback. E.g., a provision before start time (i.e., auto-provision) followed by subsequent terminate request, will result in a callback for terminate, but not for the provision request. Here the client must then clear all pending correlationIds, complicating the implementation (the client side issues are simple though). All this is further complicated by the fact that we haven't established if it is the provider or requester which is responsible for ensuring that correct connection state is updated. Resolution of Issue: Remove correlationId from the WSDL. This will make the state update messages (reserveConfirmed, etc.) idempotent, meaning they can be repeated. The requester will then update any state references about the remote connection to fit with the last received message (this also has problems, but none that doesn't exist in the current protocol).

1 3

minutes from yesterday's call
by Guy Roberts 28 Mar '13

28 Mar '13

... are available here: https://redmine.ogf.org/dmsf/nsi-wg?folder_id=6529 _____________________________________________________________________ Guy Roberts PhD Senior Transport Network Architect DANTE Cambridge, UK +44 1223 371316 DANTE is the project co-ordinator and operator of GÉANT, the high-speed pan-European research and education network that is transforming the way researchers collaborate. Learn more at: www.geant.net<http://www.geant.net/> Like us on: www.facebook.com/GEANTnetwork<http://www.facebook.com/GEANTnetwork> Follow us at: www.twitter.com/GEANTnews<http://www.twitter.com/GEANTnews> DANTE is the trading name of Delivery of Advanced Network Technology to Europe Limited registered in England & Wales. Registration Number 2806796. Registered Office - 9400 Garsington Road, Oxford Business Park, Oxford OX4 2HN. _____________________________________________________________________

1 0

Wednesday's NSI conf call
by Guy Roberts 26 Mar '13

26 Mar '13

The following is dial-in information for Wednesday's NSI call. Time: 7:00 PDT 10:00 EDT, 14:00 GMT, 15:00 CET, 23:00 JST note new times 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: - Short discussion on state of v2.0 document writing. _____________________________________________________________________ Guy Roberts PhD Senior Transport Network Architect DANTE Cambridge, UK +44 1223 371316 DANTE is the project co-ordinator and operator of GÉANT, the high-speed pan-European research and education network that is transforming the way researchers collaborate. Learn more at: www.geant.net<http://www.geant.net/> Like us on: www.facebook.com/GEANTnetwork<http://www.facebook.com/GEANTnetwork> Follow us at: www.twitter.com/GEANTnews<http://www.twitter.com/GEANTnews> DANTE is the trading name of Delivery of Advanced Network Technology to Europe Limited registered in England & Wales. Registration Number 2806796. Registered Office - 9400 Garsington Road, Oxford Business Park, Oxford OX4 2HN. _____________________________________________________________________

1 0

NSI v2.0 document writing tasks
by Guy Roberts 20 Mar '13

20 Mar '13

Hello All, At today's meeting we have assigned document writing tasks to specific authors. Topics, Authors and deadlines are summarised here: Topic Author due CS coordinator fuctions Chin Guok 13th April Security Inder Monga 6th April Firewall discussion John MacAuley 13th April State machine Tomohiro Kudoh 13th April WSDL John MacAuley 13th April Discovery service John MacAuley 13th April Topology service Jeroen van der Ham 6th April Topology syntax (separate document from service) Jeroen van der Ham 6th April Topology usage Jeroen van der Ham 6th April NSI CS introduction and concepts Guy Roberts 6th April Any additional topics emerging are to be assigned next week. Guy _____________________________________________________________________ Guy Roberts PhD Senior Transport Network Architect DANTE Cambridge, UK +44 1223 371316 DANTE is the project co-ordinator and operator of GÉANT, the high-speed pan-European research and education network that is transforming the way researchers collaborate. Learn more at: www.geant.net<http://www.geant.net/> Like us on: www.facebook.com/GEANTnetwork<http://www.facebook.com/GEANTnetwork> Follow us at: www.twitter.com/GEANTnews<http://www.twitter.com/GEANTnews> DANTE is the trading name of Delivery of Advanced Network Technology to Europe Limited registered in England & Wales. Registration Number 2806796. Registered Office - 9400 Garsington Road, Oxford Business Park, Oxford OX4 2HN. _____________________________________________________________________

1 0

Wednesday's NSI conf call
by Guy Roberts 18 Mar '13

18 Mar '13

The following is dial-in information for Wednesday's NSI call. Time: 7:00 PDT 10:00 EDT, 14:00 GMT, 15:00 CET, 23:00 JST note new times 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: - Preparing NSI v2.0 documentation _____________________________________________________________________ Guy Roberts PhD Senior Transport Network Architect DANTE Cambridge, UK +44 1223 371316 DANTE is the project co-ordinator and operator of GÉANT, the high-speed pan-European research and education network that is transforming the way researchers collaborate. Learn more at: www.geant.net<http://www.geant.net/> Like us on: www.facebook.com/GEANTnetwork<http://www.facebook.com/GEANTnetwork> Follow us at: www.twitter.com/GEANTnews<http://www.twitter.com/GEANTnews> DANTE is the trading name of Delivery of Advanced Network Technology to Europe Limited registered in England & Wales. Registration Number 2806796. Registered Office - 9400 Garsington Road, Oxford Business Park, Oxford OX4 2HN. _____________________________________________________________________

1 0

SwitchingService presentation for OGF37
by Takahiro Miyamoto 18 Mar '13

18 Mar '13

Hi all, Here are the slide of SwitchingService for my presentation. -- Takahiro Miyamoto <tk-miyamoto(a)kddi.com> KDDI Corporation TEL: +81-80-5945-9004

3 3

NSI v2.0
by Guy Roberts 13 Mar '13

13 Mar '13

We now have an agreed set of features for NSI v2.0. You can see this list here: https://docs.google.com/document/d/1_X0pqbc-DqbzDI_C259rz9npk7EuEmZFoq3CU98… I would like to thank all the people who contributed to this week's NSI meeting (and over the past months) to made this possible. We now have a high priority task to write this up. I would like to see a draft ready for review by Friday 5th of April. I will contacting individuals about their contributions to this document over the next few days. Thanks again, Guy _____________________________________________________________________ Guy Roberts PhD Senior Transport Network Architect DANTE Cambridge, UK +44 1223 371316 DANTE is the project co-ordinator and operator of GÉANT, the high-speed pan-European research and education network that is transforming the way researchers collaborate. Learn more at: www.geant.net<http://www.geant.net/> Like us on: www.facebook.com/GEANTnetwork<http://www.facebook.com/GEANTnetwork> Follow us at: www.twitter.com/GEANTnews<http://www.twitter.com/GEANTnews> DANTE is the trading name of Delivery of Advanced Network Technology to Europe Limited registered in England & Wales. Registration Number 2806796. Registered Office - 9400 Garsington Road, Oxford Business Park, Oxford OX4 2HN. _____________________________________________________________________

2 1

NSI CS v2.0 Coordinator and MTL
by Chin Guok 11 Mar '13

11 Mar '13

Hi all, Here are the slides on the NSI CS v2.0 Coordinator and MTL that was presented today. - Chin -- Chin Guok NOC: (510) 486-7600 ESnet Network Engineering Group (AS293) (800) 333-7638 Lawrence Berkeley National Laboratory

1 0

WSDL updates
by John MacAuley 11 Mar '13

11 Mar '13

Peoples, You may have seen quite a bit of activity from Google Code the last couple of days. I have updated the WSDL and XSD descriptions with all the agreed changes. I have attached a spreadsheet covering the modifications completed to this point. I have started to do the new state machine changes, but do not fully understand some of the data elements associated with the new events. I will complete these last ones as soon as I can get Tomohiro and Chin to explain them to me. Please grab the current source snapshot from the trunk. I will pull together a slide package to walk us through the changes completed. John

3 3

state machine slide/spreadsheet for OGF37 agreement
by Tomohiro Kudoh 11 Mar '13

11 Mar '13

Hi all, Here are the slide and spreadsheet I used for today's presentation. Tomohiro

1 0