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Re: netconf notification transport issues



Hello,
Someone brought up the scenario that one netconf management system might supervise many (thousands) nodes. In this case requiring the manager to have 2 instead of one sessions for each node might be a problem.

What is the problem actually with multi-use ? (The advantage of having fewer sessions is clear.) Even if we have multi-use sessions do we really need multiple channels ? Why ?

Having a never ending RPC call that sound as a strange use of the RPC concept for me also someone told me on this list that one RPC call can only get ONE reply. Is that so ?

regards Balazs

Andy Bierman wrote:
Hi,

Phil brought up some transport issues again, that I think we should
find out some opinions, one way or the other.

1) Multi-use session

  Is it important that a manager be able to issue <rpc> calls and
  receive <notification> messages within the same session?

  The other option (Single-use session) implies that the manager
  will establish multiple single purpose sessions instead.

  As Phil pointed out, if single-use is okay, then the manager can
  simply make a 'start-receiving-notifications' RPC call that
  never finishes (usually until the manager shuts down the session).


2) Multiple channels and Multiple Connections

  Should we try to bring back this concept?
  Wasn't this the main reason we picked BEEP in the first place?
  Is the BEEP mapping that relevant without it?
  This issue is only relevant if multi-use sessions are required.


3) Application Acks and Reverse RPCs

  As Phil and I pointed out in emails, a notification with an
  application-ack is really just another <rpc> method, but
  from the agent to the manager.  It might be simpler to define
  how to reverse the flow for notification purposes, rather
  than redefining the <rpc> and <rpc-reply> elements.

  Should this feature be dropped, capability-based, or mandatory?
  If kept, how should it be done?


4) Any More Transport Issues??

Andy


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Balazs Lengyel                       Ericsson Hungary Ltd.
TSP System Manager
ECN: 831 7320                        Fax: +36 1 4377792
Tel: +36-1-437-7320     email: Balazs.Lengyel@ericsson.com

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