Re: [Pce] Comment on draft-ietf-pce-pcep-p2mp-extensions

Nic and Adrian,

Thanks for your suggestions!

By using the existing SVEC functionality, PCC can request the secondary P2MP
LSP path computation to protect the whole P2MP path tree by specifying the
S/N/L bit in the SVEC object. 

If we understand the new requirements you suggested for S2L sub-path
diversity, you want the PCC to be able to ask the PCE to compute secondary
P2MP path tree with partial path diversity for certain leaves or certain S2L
sub-path. 

We will address these new requirements in our next version of the draft.

Quintin

-----Original Message-----
From: Adrian Farrel [mailto:adrian@olddog.co.uk] 
Sent: Wednesday, November 19, 2008 3:49 PM
To: Nic Neate; qzhao@huawei.com; Mohamad.Chaitou@orange-ftgroup.com
Cc: Jeanlouis.Leroux@orange-ftgroup.com; pce@ietf.org; daniel@olddog.co.uk
Subject: Re: [Pce] Comment on draft-ietf-pce-pcep-p2mp-extensions

Ah, that is an interesting and valid point, Nic.

And I think one might also consider "directional diversity" for your ring 
example.

A
----- Original Message ----- 
From: "Nic Neate" <Nic.Neate@dataconnection.com>
To: <qzhao@huawei.com>; <Mohamad.Chaitou@orange-ftgroup.com>
Cc: <Jeanlouis.Leroux@orange-ftgroup.com>; <pce@ietf.org>; 
<daniel@olddog.co.uk>
Sent: Wednesday, November 19, 2008 8:28 PM
Subject: [Pce] Comment on draft-ietf-pce-pcep-p2mp-extensions

Hi,

I have a suggestion for a small extension to the PCEP P2MP draft.

I believe the base PCEP specification currently has three options for 
calculating diverse protection paths: link diverse, node diverse and SRLG 
diverse (draft-ietf-pce-pcep section 7.13.2).

In P2MP, S2L sub-path diverse is another important case.  I think it would 
be good to allow the PCC to request computation of S2L sub-path diverse 
protection paths.

This is useful when doing 1+1 protection in a ring topology, for example.

Nic

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