Re: [mpls] MPLS-RT review of draft-farbryantrel-mpls-retire-ach-tlv

John,
Lots of thanks for a prompt response.

It fully matches my understanding of the situation, and this is why I've said that the example given by Jia is a strong one.

My 2c,
     Sasha

> -----Original Message-----
> From: John E Drake [mailto:jdrake@juniper.net]
> Sent: Sunday, June 09, 2013 5:14 PM
> To: Alexander Vainshtein
> Cc: Hejia (Jia); draft-farbryantrel-mpls-retire-ach-tlv@tools.ietf.org;
> mpls@ietf.org; mpls-chairs@tools.ietf.org; Loa Andersson
> Subject: Re: [mpls] MPLS-RT review of draft-farbryantrel-mpls-retire-ach-tlv
> 
> Actually, the design allows CC to be processed in hardware and CV in software
> while allowing the presence of the *trailing* TLV used in CV to be detected in
> hardware.
> 
> Sent from my iPhone
> 
> On Jun 9, 2013, at 8:54 AM, "Alexander Vainshtein"
> <Alexander.Vainshtein@ecitele.com> wrote:
> 
> > Jia and all,
> >
> > I fully agree that the text explaining why ACH TLVs are not needed does not
> have to be very specific.
> >
> > At the same time I am not sure that MEP-ID TLV in RFC 6428 is a strong
> example for the need of HW processing of TLVs in G-ACH messages.
> >
> > My 2c,
> >     Sasha
> >
> >> -----Original Message-----
> >> From: mpls-bounces@ietf.org [mailto:mpls-bounces@ietf.org] On Behalf Of
> >> Hejia (Jia)
> >> Sent: Thursday, May 23, 2013 2:52 PM
> >> To: Loa Andersson; Martin Vigoureux; draft-farbryantrel-mpls-retire-ach-
> >> tlv@tools.ietf.org; mpls-chairs@tools.ietf.org
> >> Cc: mpls@ietf.org
> >> Subject: Re: [mpls] MPLS-RT review of draft-farbryantrel-mpls-retire-ach-tlv
> >>
> >> Hi,
> >>
> >> I noticed a 01 version of draft-farbryantrel-mpls-retire-ach-tlv is available. So
> I
> >> based my MPLS RT review on that version. I think the document is coherent,
> >> useful, technically sound and ready to be adopted as a WG draft. Just one
> >> comment:
> >>
> >> 1) In the Abstract part, it is written as
> >>
> >>   No Associated Channel Type yet defined uses a TLV. Furthermore, it
> >>   is believed that handling TLVs in hardware introduces significant
> >>   problems to the fast-path, and since G-ACh messages are intended to
> >>   be processed substantially in hardware, the use of TLVs in
> >>   undesirable.
> >>
> >> The whole paragraph seems talking generally about TLVs for G-ACh
> messages,
> >> not specifically an ACH TLV. This might not be so accurate since we have
> some
> >> G-ACh channel type using TLVs in its message, e.g. RFC 6428 defines a
> source
> >> MEP-ID TLV for the MPLS-TP CV type which also requires hardware
> processing. I
> >> think it might be better to simply say ACH TLV is not used and may cause
> >> additional processing which is not desirable. Or some better wording...
> >>
> >> Thanks!
> >>
> >>
> >> B.R.
> >> Jia
> >>
> >>
> >> -----邮件原件-----
> >> 发件人: Loa Andersson [mailto:loa@pi.nu]
> >> 发送时间: 2013年5月8日 16:01
> >> 收件人: Lizhong Jin; Hejia (Jia); Gregory Mirsky; Eric Osborne (eosborne);
> >> Martin Vigoureux
> >> 抄送: draft-farbryantrel-mpls-retire-ach-tlv@tools.ietf.org; mpls-
> >> chairs@tools.ietf.org
> >> 主题: MPLS-RT review of draft-farbryantrel-mpls-retire-ach-tlv
> >>
> >> Jia, Lizhong, Greg and Eric,
> >>
> >> You have been selected as an MPLS Review team reviewers for
> >> draft-farbryantrel-mpls-retire-ach-tlv-00.
> >>
> >> Note to authors: You have been CC'd on this email so that you can know
> >> that this review is going on. However, please do not review your own
> >> document.
> >>
> >> Reviews should comment on whether the document is coherent, is it
> >> useful (ie, is it likely to be actually useful in operational
> >> networks), and is the document technically sound?  We are interested
> >> in knowing whether the document is ready to be considered for WG
> >> adoption (ie, it doesn't have to be perfect at this point, but should be
> >> a good start).
> >>
> >> Reviews should be sent to the document authors, WG co-chairs and
> >> WG secretary, and CC'd to the MPLS WG email list. If necessary, comments
> >> may be sent privately to only the WG chairs.
> >>
> >> Are you able to review this draft by Mat 24, 2013?
> >>
> >> Thanks, Loa
> >> (as MPLS WG chair)
> >> --
> >>
> >>
> >> Loa Andersson                        email: loa@mail01.huawei.com
> >> Senior MPLS Expert                          loa@pi.nu
> >> Huawei Technologies (consultant)     phone: +46 739 81 21 64
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