The MPLS WG Archive

[David Charlap <David.Charlap@marconi.com>]

Takao Okamawari wrote:
> David Charlap wrote:
>>>
>>> When a label is drawn from a label space?
>>> On receipt of PATH or on receipt of RESV? (And reason why...)
>>
>> The inbound label (which is sent upstream to the PHOP) may be
>> produced at any time after receiving the Path message.
> 
> Sachin Kalra wrote:
>>
>> Label is drawn from Label Space on receipt of RESV message.
> 
> Which is the correct answer with regard to the inbound label?

It doesn't matter.  You are the one generating the label.

It must be installed in your forwarding hardware before you complete
your Resv processing.  If you want to choose the label then, you may. 
If you would rather choose it during Path processing, that is also OK. 
This is an implementation detail and is not specified by the standard.

-- David