[PWE3] draft-jin-pwe3-cbit-negotiation-02

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Hi all,
As we introduced in draft-jin-pwe3-cbit-negotiation-02, label request 
message is used to do control word update. During the discussion of this 
draft, we got known that there were already some label request message 
implementations, althought there is no published standard to define the 
behavior of label request message for PW. 
In this draft, it is described that: if label withdraw is successfully 
processed before receiving label request (means PE has removed the remote 
information), PE should respond with label mapping with locally configured 
Cbit value. 
Authors would like to solicit more comments about this procedure. If 
anyone think such behavior is not reasonable or conflicts with existing 
implementations, please comment. 

Thanks
Authors of the draft

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