Subject: RE: [PWE3] Releasing MS-PW segments individually

From: "Busschbach, Peter B (Peter)" <[email-masked]>
Date: Thu, 30 Nov 2006 12:38:54 -0500

> 
> Surely you MUST allow release from any point. If you get a
> mid-point failure, the PW has to be shut down from the
> failure adjacencies back towards the two ends.
> 
> - Stewart
> 

Stewart,

I am not sure we MUST allow mid-point release. In most connection-oriented protocols, release is initiated by the end-points. If mid-point failures occur, the end-points are informed through error messages in the control plane or through loss of continuity detection in the data plane.

What happens if a failure is only detected by one end of a PW segment (e.g. due to a failure that affects only one direction of the traffic)? You might end up with a situation in which one half of the MS-PW is released while the other half is still up.

Peter 

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