Re: [Mpls-interop] MPLS-TP OAM requirements - Lock and notification of lock

[Huub van Helvoort <[e-mail]>]

Bonjour Martin,

You replied:

> please see in-line.

ditto


> Huub van Helvoort a écrit :
>> Bonsoir Martin,
>>
>> To continue with the othe rquestion:
>>
>>> See also my e-mail:
>>> MPLS-TP OAM requirements - AIS/LockNotif - Can MIPs send "usolicited" 
>>> OAM messages ?
>>
>> The answer was no.
> 
> [mvx] well, I am not sure about this.

[hvh] The definition used in ITU-T is:

MEG Intermediate Point (MIP) is an intermediate point in a MEG which
is capable of reacting to some OAM frames. A MIP does not initiate
OAM frames. A MIP takes no action on the transit packet flows.

>>> -question:
>>> More generally to the comment above, who should notify and who should
>>> notify whom?
>>> I would tend to say:
>>> the receiving node of a locked direction, informs downstream receiving
>>> nodes of nested LSPs. 
>>
>> To be more exact, the sink side of a locked LSP, PW, Section, has to
>> inform its clients.
> 
> [mvx] Indeed but that is not precise enough, in my view.
> Who are the clients? Both end points or only the one downstream?

[hvh] only the downstream (sink) end points (MEPs).

>>> This is a Fowrward Indication and if we do
>>> so then receiving points MUST indeed be informed of a Lock (c.f.
>>> discussion at the beginning of the e-mail).
>>> Should source points (locking points) do some reverse indication and
>>> notify the source points of the LSPs that are nested in the locked LSP?
>>> (but this maybe falls in the RDI functionality).
>>
>> Isn't this notification already caused by the locking at the
>> far end?
>> Or is the locking only applied in one direction of a bi-directional
>> path? If yes, then the notification is not required.
> 
> It appear to me that you are mixing the notification at the same
> layer and notification at the impacted client layers.
> My question was:
> in case a Lock is performed at one point I suppose we need to inform
> the other end point of that status (same layer)

[hvh] I agree

> But then what do these two nodes do? Which node of the locked server
> layer inform which node of the impacted clients layer?

[hvh] the sink MEP of the server layer should inform
the sink MEPs of the client layer.

Cheers, Huub.

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