Re: [PWE3] draft-boutros-pwe3-mpls-tp-ms-pw-00

[[e-mail]]

Hi Sami,
I may miss something, sorry for that. Would you please explain more about 
the PW pinned down to the LSP? Is this a dedicated PW for LB with same BW 
and TOS as LSP, or a normal service PW?

Thanks
Lizhong
 

Sami Boutros <[e-mail]> wrote on 2010-11-27 02:35:12:

> Hi Lizhong,
> 
> Thanks for your comments, please see responses inline.
> At 07:03 PM 11/25/2010, [e-mail] wrote:

> Hi Sami 
> A couple of questions around this draft. 
> 1. section 3.1.1.1, If PW2 is a dynamic segment and does not support
> PW status, S-PE needs to withdraw its labels from T-PE2 before 
> locking the MPLS LSP. 
> [Lizhong] S-PE should also withdraw its labels from T-PE1 if PW1 is 
> dynamic segment and does not support PW status, since it is locking 
> LSP, not PW, right? 
> 
> Correct, we will clarify that in the text.

> 2. section 3.1.1.2, It then sends LI request message to T-PE1. 
> [Lizhong] "It" refers to "S-PE1", right? 
> 
> Right, we will fix this, change S-PE to S-PE1

> 3. section 3.2.1, T-PE1 sends an LB request message which is 
> received by S-PE. S-PE can setup the MPLS-TP LSP only if all the PWs
> carried over that LSP can be setup in loopback mode. 
> 
> If the MPLS-TP LSP is successfully setup in loopback mode, all 
> incoming packets over PW1 will be looped back to T-PE1. 
> [Lizhong] Does that mean the LB packets need to be running over PW, 
> and encapsulated with PW packets? But usually the PW will not shair 
> same fate with LSP. 
> 
> We are discussing the case when the PW is pinned down to the LSP 
> that is being put in loopback, in that case the PW will share the 
> fate of the LSP and hence packets sent over the PW will be looped 
> back since the LSP will be put in loopback.

> If we want to only do loopback for LSP, it seems that only 
> bidirectional LSP without PHP can do such LB function. 
> 
> Correct, the LSP has to be bidirectional for the LB function to work.
> 
> Thanks,
> 
> Sami

> Thanks 
> Lizhong 
> 
> 
> > ------------------------------
> > 
> > Message: 5
> > Date: Tue, 23 Nov 2010 02:30:19 -0800
> > From: Sami Boutros <[e-mail]>
> > Subject: [PWE3] draft-boutros-pwe3-mpls-tp-ms-pw-00
> > To: <[e-mail]>
> > Cc: "[e-mail]" <[e-mail]>,   "Siva Sivabalan
> >    \(msiva\)" <[e-mail]>
> > Message-ID: <[e-mail]>
> > Content-Type: text/plain; charset="us-ascii"; format=flowed
> > 
> > Hi PWE3 working group,
> > 
> > We have presented "PW Stitching Procedures in MPLS-TP Networks" at 
> > IETF78 and 79
> > http://tools.ietf.org/html/draft-boutros-pwe3-mpls-tp-ms-pw-00
> > 
> > This informational draft extends the PW stitching procedures defined 
> > in "draft-ietf-pwe3-segmented-pw-18.txt".
> > It describes the PW status exchange when connecting 2 PW segments 
> > with one or both of them are static running inband PW OAM messages 
> > specified in "draft-ietf-pwe3-static-pw-status-00.txt".
> > It describes what PW status value to use when (1) one PW segment is 
> > being locked using (LI) or put in Loopback (LB) or (2) when the 
> > MPLS-TP LSP carrying the PW segment is being locked or put in 
LoopBack.
> > Lock Instruct (LI) and Loopback (LB) OAM functions for MPLS-TP 
> > networks specified in"draft-ietf-mpls-tp-li-lb-00.txt".
> > 
> > The authors are seeking more feedback from the mailing list, and 
> > would be grateful if you could review the document and post comments 
> > on the mailing list.
> > 
> > Thanks,
> > 
> > Sami
> > 
> > 
> 

> 
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