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Re: MS-SPring

Hello Dimitri,

You asked:

hi huub,

Huub van Helvoort wrote:

Hallo Dimitri,

You responded to Diego:

Diego Caviglia wrote:

Hi Dimitri,
given the high number of MS-SPRing protected transport network
already deployed seems reasonable to me, from a Network Operator point of
view, to use at the same time MS-SPRing protection with GMPLS restoration.


there are already two questions here 1. is there an operational need to control such rings using GMPLS (? for instance is it effective knowing that ring based protection is mainly data plane driven ?) and 2. how to position the ring protection wrt to the LSP recovery segment/end-to-end recovery 


The first step in MS-Spring is indeed dataplane driven (using APS)
but that involves only nodes adjacent to the fault.


ok, btw, is there a reason to restrict to MS/line protection ring ? 

If you refer to the APS protocol, this can be used in ring
protection and linear protection, because it operates between
source and sink of a trail or LSP.
In its most simple form it provides 1:1 protection, and more
general N:M protection

The reconfiguration of the ring after this first switch is controlplane
driven and concerns all nodes in the ring.

ok with this - like for other linear protection schemes the control plane would be involved in the provisioning

also, what about the (informational) notification to maintain the control plane aware about the data plane status after failure detection and/or after the APS operation 

Maybe it is a good idea to include a description in the document
Diego is preparing (in the book on functional modeling I need
six pages to describe this protection mechanism).

Have a nice weekend, Huub.

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