Re: [mpls] New version of draft-boutros-mpls-tp-loopback-01

[Sami Boutros <sboutros at cisco.com>]

Hi Nitin,

Please have a look at the 02 version.

At 09:52 PM 3/22/2009, Nitin Bahadur wrote:
> Hi Sami,
>
>    I have a few meta questions on your draft.
>
> 1) Can you clarify if this loopback function is applicable just to MPLS-TP
> or also to MPLS LSPs in general.

They are applicable for MPLS LSP's in general.

> 2) You mention that a MPLS-TP LSP can be set into FLB or OLB mode. I presume
> the *unlock OAM packets* will not be looped back. Can you please clarify
> that ?

Sure.

> 3) I am not clear on the motivation for OAM loopback mode. Can you clarify
> why we need a OAM loopback mode ?

in draft-ietf-mpls-tp-oam-requirements-01.txt need of loopback function is
mentioned for connection verification and for 2 ways delay measurements.

> 4) Section 4.5 - Auth TLV. If the message is sent in-band, do we need a
> auth-tlv ? Was there any requirement (in some requirement draft) to have
> auth for loopback mode?

Good point will ask to add this requirement to the requirement doc for OAM
intrusive functions.

> 5) Section 4.9 - Data packets. The optional seq-id solution seems a little
> half-baked. At the least, the id should be a 64-bit field.

Will look into that.

> 6) Section 4.10 - NMS. This section seems to specify requirements and no
> real solution. I'm not sure why this section is part of your draft. Your
> draft does not seem to add anything new to enable a NMS to do something.

This is a TBD section need more work.

> 7) Finally, you have defined a new encap mechanism for TLVs. Any particular
> reason that the lsp-ping packet cannot be enclosed after the ACH header? Can
> we just re-use the lsp-ping packet formats....they seem to have a whole
> bunch of things that you are re-defining.

We made the message format in 02 very similar to the LSP ping Message format.

Thanks,

Sami

> Thanks
> Nitin
>
> > --------------------------------------------------
> > From: "Sami Boutros" <sboutros at cisco.com>
> > Sent: Friday, November 07, 2008 1:09 AM
> > To: "Loa Andersson" <loa at pi.nu>; <mpls at ietf.org>
> > Cc: "Siva Sivabalan (msiva)" <msiva at cisco.com>; "David Ward"
> > <dward at cisco.com>
> > Subject: [mpls] New version of draft-boutros-mpls-tp-loopback-01
> >
> >> Please find the updated version of the draft @
> >>
> >> http://www.tla-group.com/~loa/draft-boutros-mpls-tp-loopback-01.txt
> >>
> >> Thanks,
> >>
> >> Sami
> >>
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