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

[Sami Boutros <[e-mail]>]

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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