Re: [Pce] draft-ietf-pce-stateful-pce : clarifying the End Of Synchronization marker

Hi again,

We also found an issue when a PCC removes a LSP. It would be good to precise the objects that are mandatory, optional in this case also. 
Some PCE implementations are waiting for an ERO in the PCRpt that removes an LSP, while some PCC does not send an ERO. 
Would be good to clarify the procedure of LSP removal.

Best Regards,

-----Original Message-----
From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of stephane.litkowski@orange.com
Sent: Tuesday, June 21, 2016 17:18
To: pce@ietf.org
Subject: [Pce] draft-ietf-pce-stateful-pce : clarifying the End Of Synchronization marker

Hi,

Doing some interop testing between two vendors we falled into misinterpretation of the current text of the End Of Sync marker content.

Here is the current text :

"The end of synchronization marker is a PCRpt message with the SYNC
   Flag set to 0 for an LSP Object with PLSP-ID equal to the reserved
   value 0 (see Section 7.3).  The LSP Object does not include the
   SYMBOLIC-PATH-NAME TLV in this case, it will include an empty ERO as
   its intended path and will not include the optional RRO object in the
   path.  If the PCC has no state to synchronize, it will only send the
   end of synchronization marker."

The current text, IMO, has the following issues :
- it uses non normative wording : "does not include", "will include" , "will not include". How do we need to interpret it ? MUST, SHOULD, MAY ?
- it does not precise if it can include or not some other objects : can it include an LSP-Identifier object (with all fields to 0) ? 

It would be good to enhance the text to better describe the content of EOS.

We suppose that in case there is an issue with the encoding of the EOS marker, the following behavior will be applied, could you confirm ? (typically bad encoding of EOS marker) :
" The PCE does not send positive acknowledgements for properly received
   synchronization messages.  It MUST respond with a PCErr message with
   error-type 20 (LSP State Synchronization Error) and error-value 1
   (indicating an error in processing the PCRpt) (see Section 8.5) if it
   encounters a problem with the LSP State Report it received from the
   PCC and it MUST terminate the session."

Thanks,

Stephane Litkowski
Network Architect
Orange/SCE/EQUANT/OINIS/NET
Orange Expert Future Networks
phone: +33 2 23 28 49 83
mobile: +33 6 37 86 97 52
stephane.litkowski@orange.com 

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