Re: [Mpls-interop] MPLS-TP OAM requirements - AIS/LockNotif - Can MIPs send "usolicited" OAM messages ?

"Malcolm Betts" <betts01@nortel.com> Tue, 05 May 2009 13:44 UTC

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Date: Tue, 05 May 2009 09:46:02 -0400
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Thread-Topic: [Mpls-interop] MPLS-TP OAM requirements - AIS/LockNotif - Can MIPs send "usolicited" OAM messages ?
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From: Malcolm Betts <betts01@nortel.com>
To: hhelvoort@chello.nl, George Swallow <swallow@cisco.com>
Cc: mpls-interop@ietf.org
Subject: Re: [Mpls-interop] MPLS-TP OAM requirements - AIS/LockNotif - Can MIPs send "usolicited" OAM messages ?
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Agree, see in line. 


Malcolm Betts
Nortel Networks
Phone: +1 613 763 7860 (ESN 393)
email: betts01@nortel.com

-----Original Message-----
From: mpls-interop-bounces@ietf.org
[mailto:mpls-interop-bounces@ietf.org] On Behalf Of Huub van Helvoort
Sent: Monday, May 04, 2009 6:03 PM
To: George Swallow
Cc: mpls-interop@ietf.org
Subject: Re: [Mpls-interop] MPLS-TP OAM requirements - AIS/LockNotif -
Can MIPs send "usolicited" OAM messages ?

Hello George,

You wrote:

> I very much agree with Martin here.
> 
> In MPLS-TP the MEG level is not explicit.  It is inferred from the LSP

> the OAM is received on.  In typical LSRs, a Server layer down event, 
> e.g. The failure of a link results in an "Interface Down Event".  When

> this occurs all clients of that interface that have registered for the

> event would be notified.  Further notification of peer entities is the

> responsibility of those clients.

I agree with this as well.

> So to me it makes a great deal of sense to have the MEP serving the 
> link declare that the IF is down, and have the client MIPs be 
> responsible for sending any needed OAM messages regarding that event.

The notification of the "interface down event" should be accomplished by
inserting the OAM message (server failed) in the adaptation function of
the server layer MEP.

MB> Not convinced that we need an OAM message, we do need a local
notification.

Regards, Huub.

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