Re: [Bier] WGLC: draft-ietf-bier-php
"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Thu, 17 September 2020 10:40 UTC
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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: Loa Andersson <loa@pi.nu>, "Mankamana Mishra (mankamis)" <mankamis=40cisco.com@dmarc.ietf.org>
CC: Greg Shepherd <gjshep@gmail.com>, "bier@ietf.org" <bier@ietf.org>
Thread-Topic: [Bier] WGLC: draft-ietf-bier-php
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References: <1E057E92-424E-4456-936C-F8C842340ADB@gmail.com> <9300613D-A740-476E-BC8F-3B0D25C8E883@cisco.com> <223C9348-563A-43DC-B9E3-DE978CA7FA68@cisco.com> <CABNhwV0SGV2nE430f9SeVOe1XSq83ZM5CbwcifPuhFBye-Tj+g@mail.gmail.com> <fe49cb0e-09e4-3274-b374-bf861e132518@pi.nu> <f4e704f8-94ec-3802-05de-8eb3150c30ca@pi.nu>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/mUGX7k048TdG3zVwOmW-GyXSass>
Subject: Re: [Bier] WGLC: draft-ietf-bier-php
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Hi Loa, Please see https://mailarchive.ietf.org/arch/msg/bier/xi6hpAdFLUBjYBVo9I4nr_418x4/ and https://mailarchive.ietf.org/arch/msg/bier/nbPn1uq8XM_RsQq0vaUBQZ5JYjM/. The -06 revision is here: https://tools.ietf.org/html/draft-ietf-bier-php-06. Thanks! Jeffrey Juniper Business Use Only -----Original Message----- From: BIER <bier-bounces@ietf.org> On Behalf Of Loa Andersson Sent: Thursday, September 17, 2020 3:20 AM To: Gyan Mishra <hayabusagsm@gmail.com>; Mankamana Mishra (mankamis) <mankamis=40cisco.com@dmarc.ietf.org> Cc: IJsbrand Wijnands (iwijnand) <iwijnand=40cisco.com@dmarc.ietf.org>; Greg Shepherd <gjshep@gmail.com>; bier@ietf.org Subject: Re: [Bier] WGLC: draft-ietf-bier-php [External Email. Be cautious of content] Working Group, authors, I don't think I saw a response on this. /Loa On 22/08/2020 13:57, Loa Andersson wrote: > Working Group, > > I've had time to read the draft a bit more in detail. > > I'm convinced that this will work, and support progressing the draft. > > I still think there are some minor description details that could be > improved. > > The draft says: > > One way to solve this problem is to use Penultimate Hop Popping (PHP) > so that the upstream BFR can pop the BIER header and send the payload > "natively" (note that the upstream BFR can be connected directly or > indirectly via any type of tunnel to the PE). This is similar to > Multi-Protocol Label Switching (MPLS) PHP though it is the BIER > header that is popped. > > This indicate that this is a "per node" decision, while in MPLS it is > a per LSP decision. > > I would think that it is possible for one node to be the penultimate > node for some traffic but not for other traffic, even though the > traffic is sent to the same node, which can be both ultimate node, > pen-ultimate node or transit node. > > > +-------+ +-------+ +-------+ > | | | | | | > -a,b-+ A +-----a',b-----+ B +----a'----+ CPE1 | > | | | | | | > +-------+ +---+---+ +-------+ > | > b' > | > +---+---+ +-------+ > | | | | > + C +----b'----+ CPE2 | > | | | | > +---+---+ +-------+ > > > Two streams comes in to A from the left (a and b). > > A is the penultimate node for traffic to to CPE1 (a) so the BIER > header is popped. > > A is not the penultimate node for traffic to to CPE2 (b) so the BIER > header is popped. > > Both a' and b is sent to B. > > B forward a' natively to CPE1. > > B is the penultimate node for traffic to to CPE2 (b) so the BIER > header is popped. > > b' is forwarded to C and onto CPE2 > > Works just fine. > > Question: If the PHP is a "per node decision" how is A stopped from > doing PHP for b? > > /Loa > > > > On 22/08/2020 05:20, Gyan Mishra wrote: >> >> I support advancing this critical draft forward. I agree that the >> PHP feature traditionally used with MPLS and has been adopted by SR >> and now by BIER for similar reasons of being able to pop the BIER >> header similar to what is done with SR PHP concept and now extensible >> with BIER for Non-BRF capable PE's. >> >> BIER IPv6 is still being developed, however I think maybe BIERin6 >> could take advantage of PHP by popping the encapsulated L2 1/2 BIER >> shim for "Non-BFR" capable PE. I think for BIERv6 as the BIER header >> is encoded in DOH it may be difficult to support PHP. >> >> Thanks >> >> Gyan >> >> On Wed, Aug 19, 2020 at 2:01 PM Mankamana Mishra (mankamis) >> <mankamis=40cisco.com@dmarc.ietf.org >> <mailto:40cisco.com@dmarc.ietf.org>> wrote: >> >> Support moving this document forward. ____ >> >> __ __ >> >> *From: *BIER <bier-bounces@ietf.org <mailto:bier-bounces@ietf.org>> >> on behalf of "IJsbrand Wijnands (iwijnand)" >> <iwijnand=40cisco.com@dmarc.ietf.org >> <mailto:40cisco.com@dmarc.ietf.org>> >> *Date: *Monday, August 17, 2020 at 11:56 AM >> *To: *Greg Shepherd <gjshep@gmail.com <mailto:gjshep@gmail.com>> >> *Cc: *"bier@ietf.org <mailto:bier@ietf.org>" <bier@ietf.org >> <mailto:bier@ietf.org>> >> *Subject: *Re: [Bier] WGLC: draft-ietf-bier-php____ >> >> __ __ >> >> In support moving this draft forward, ____ >> >> __ __ >> >> Thx,____ >> >> __ __ >> >> Ice.____ >> >> Sent from my iPhone____ >> >> >> >> ____ >> >> On 13 Aug 2020, at 05:31, Greg Shepherd <gjshep@gmail.com >> <mailto:gjshep@gmail.com>> wrote:____ >> >> >> Please read and respond to this thread. We had a WGLC for this >> draft previously, but had no response. Let’s do better. ____ >> >> __ __ >> >> >> https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ie >> tf-bier-php/______;!!NEt6yMaO-gk!Xc7KbkW_lel3I36HaEzsUA2xMeb5gSroB5W1 >> mBAhG2yLZjknTH9OQEibSJ4RCvEs$ >> >> __ __ >> >> Start of short LC timer. Respond by Aug 19..____ >> >> __ __ >> >> - Shep____ >> >> (Chairs)____ >> >> _______________________________________________ >> BIER mailing list >> BIER@ietf.org <mailto:BIER@ietf.org> >> >> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/bie >> r______;!!NEt6yMaO-gk!Xc7KbkW_lel3I36HaEzsUA2xMeb5gSroB5W1mBAhG2yLZjk >> nTH9OQEibSDeBjgsU$ >> >> _______________________________________________ >> BIER mailing list >> BIER@ietf.org <mailto:BIER@ietf.org> >> >> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/bie >> r__;!!NEt6yMaO-gk!Xc7KbkW_lel3I36HaEzsUA2xMeb5gSroB5W1mBAhG2yLZjknTH9 >> OQEibSLzVgreZ$ >> >> >> >> -- >> >> <https://urldefense.com/v3/__http://www.verizon.com/__;!!NEt6yMaO-gk! >> Xc7KbkW_lel3I36HaEzsUA2xMeb5gSroB5W1mBAhG2yLZjknTH9OQEibSH6MkdrA$ > >> >> *Gyan Mishra* >> >> /Network Solutions A//rchitect / >> >> /M 301 502-1347 >> 13101 Columbia Pike >> /Silver Spring, MD >> >> >> >> _______________________________________________ >> BIER mailing list >> BIER@ietf.org >> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/bie >> r__;!!NEt6yMaO-gk!Xc7KbkW_lel3I36HaEzsUA2xMeb5gSroB5W1mBAhG2yLZjknTH9 >> OQEibSLzVgreZ$ >> > -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 _______________________________________________ BIER mailing list BIER@ietf.org https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/bier__;!!NEt6yMaO-gk!Xc7KbkW_lel3I36HaEzsUA2xMeb5gSroB5W1mBAhG2yLZjknTH9OQEibSLzVgreZ$
- Re: [Bier] WGLC: draft-ietf-bier-php Jeffrey (Zhaohui) Zhang
- Re: [Bier] WGLC: draft-ietf-bier-php Suneesh Babu
- [Bier] WGLC: draft-ietf-bier-php Greg Shepherd
- Re: [Bier] WGLC: draft-ietf-bier-php IJsbrand Wijnands (iwijnand)
- Re: [Bier] WGLC: draft-ietf-bier-php Bidgoli, Hooman (Nokia - CA/Ottawa)
- Re: [Bier] WGLC: draft-ietf-bier-php zhang.zheng
- Re: [Bier] WGLC: draft-ietf-bier-php Xiejingrong (Jingrong)
- Re: [Bier] WGLC: draft-ietf-bier-php Greg Mirsky
- Re: [Bier] WGLC: draft-ietf-bier-php Gengxuesong (Geng Xuesong)
- Re: [Bier] WGLC: draft-ietf-bier-php Loa Andersson
- Re: [Bier] WGLC: draft-ietf-bier-php Dhruv Dhody
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- Re: [Bier] WGLC: draft-ietf-bier-php Jeffrey (Zhaohui) Zhang
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- Re: [Bier] WGLC: draft-ietf-bier-php Tony Przygienda