[Nsi-wg] Issue 92 in ogf-nsi-project: The Maastricht updates - Introduction of Notification retrieval

[ogf-nsi-project at googlecode.com]

Status: Accepted
Owner: jmacauley
Labels: Type-Defect Priority-Medium FoundInVersion-2.0 FixedInVersion-2.0

New issue 92 by jmacauley: The Maastricht updates - Introduction of  
Notification retrieval
http://code.google.com/p/ogf-nsi-project/issues/detail?id=92

Description of Issue:
During design of NSI CS version 2 the majority of error states were removed  
from the state machine and a new set of notifications were added to inform  
the uRA of issues with a reservation that did not directly effect the new  
state machine. Removing the majority of error states help simplify the  
state machine, and reduce the spontaneous state machine transitions  
previously triggered by error conditions.

As a result of this new strategy, there is no way for a uRA to determine if  
an error notification was generated against a reservation if that uRA is  
not listening to notifications on that reservation. This situation may  
occur if the RA is using a polling mechanism, or is recovering from a  
communications problem with the peer provider NSA. As you can imagine, this  
is a serious issue that needs to be addressed before NSI CS version 2 can  
be declared ready for prime time.

To help remedy this issue, it was agreed that a new mechanism should be  
added to the existing NSI CS version 2 protocol that will allow an RA to  
query a reservation and determine if there have been any error  
notifications raised against that reservation. Specifically, we need to  
allow for the handling of ErrorEventType, ReserveTimeoutRequestType, and  
messageDeliveryTimeout notifications as these will require corrective  
action from the uRA. The dataPlaneStateChange notification need not be  
handed as this state is modeled in the dataPlaneStatus element already  
available in the reservation query.

Discussion of Issue:

See attached discussion of issue.

Resolution of Issue:

A slightly modified solution 2b was agreed upon for implementation.

Attachments:
	NSI-CS-NotificationQueries-v1.pdf  975 KB

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