RE: Sonet Ring provisioning

["Vishal Sharma" <v.sharma@ieee.org>]

Zhi and all,

Great discussion! I'm glad we're finally discussing some of these
issues, and highlighting that mix inherent ring protection with
the control domain mechanisms is non-trivial.

Comments in-line.

-Vishal

> -----Original Message-----
> From: owner-ccamp@ops.ietf.org [mailto:owner-ccamp@ops.ietf.org]On
> Behalf Of Zhi-Wei Lin
> Sent: Thursday, May 30, 2002 11:54 AM
> To: Suresh Katukam
> Cc: R. Muralidharan; Bernstein, Greg; 'Manoj Agiwal'; 'Ccamp (E-mail);
> mpls@UU. NET (E-mail)
> Subject: Re: Sonet Ring provisioning
> 
> 
> Hi Suresh,
> 
> Yes agree this is very complex if you try to create too much 
> dependencies between control plane and transport plane protection 
> interactions. That is why my simplistic approach:
> 
>     * Control plane sees the entire ring as offering "highly available"
>       connections
>     * Control plane sets up a single connection across this ring
>       "sub-network" (if you think this about this, the entire ring can
>       actually be treated by a control plane controller as a single node
>       where the BLSR ring nodes may be thought of as aggregate ports on
>       the single node)
>     * The ring sub-network, by virtue of providing the protection and
>       knowing *exactly* how protection is provided can set up the
>       protection channel automatically (but control plane need not know
>       this as it is irrelevant to the control plane -- it only needs to
>       know that the single connection is protected)

What mechanism will the ring use to setup the internal protection channel?

Will it require EMS/NMS intervention, as proposed on this thread earlier,
or will there be another sequence of control plane messages (initiated
internal to the ring) to set this path up. The latter would be prefereable
if the objective is to have fully-automated path setup (otherwise, we
have EMS/NMS intervention for the ring), but it does complicate the
control plane protocols (since a new sequence of setup steps may
have to be initiated internal to each ring on the path of the end-to-end
circuit/trail that is being setup.

-Vishal
 
>