Re: [Bier] WGLC: draft-ietf-bier-php
Greg Mirsky <gregimirsky@gmail.com> Mon, 24 August 2020 18:19 UTC
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Mon, 24 Aug 2020 11:19:21 -0700
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To: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
Cc: Loa Andersson <loa@pi.nu>, "bier@ietf.org" <bier@ietf.org>
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Subject: Re: [Bier] WGLC: draft-ietf-bier-php
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Hi Jeffrey, thank you for your kind consideration of my comments and addressing them. Regards, Greg On Mon, Aug 24, 2020 at 10:50 AM Jeffrey (Zhaohui) Zhang <zzhang@juniper.net> wrote: > Hi Loa, Greg, > > > > I’ve submitted -06 to take care of your comments. > > > > Thanks. > > Jeffrey > > > > Juniper Business Use Only > > *From:* BIER <bier-bounces@ietf.org> *On Behalf Of * Jeffrey (Zhaohui) > Zhang > *Sent:* Monday, August 24, 2020 11:16 AM > *To:* Loa Andersson <loa@pi.nu>; 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]* > > > > Hi Loa, > > > > Please see zzh> below. > > > > -----Original Message----- > From: BIER <bier-bounces@ietf.org> On Behalf Of Loa Andersson > Sent: Saturday, August 22, 2020 1:57 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, > > > > 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. > > > > Zzh> It’s a per node decision for all traffic to a particular “BFER” who > does not really support BIER forwarding. PHP is not used when the BFERs do > support BIER. > > > > 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 not popped. > > > > Zzh> So the context is that B does support BIER. In that case, A won’t do > PHP for B at all. > > > > 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? > > > > Zzh> Please see above :-) > > Zzh> Thanks. > > Zzh> Jeffrey > > > > /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 <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 <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 <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 <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-iet > <https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-iet> > > > f-bier-php/______;!!NEt6yMaO-gk!Ws4otxDsuVKTsaEjyRKVYz-hcmmmGgDiE7Cnpq > > > vfA3s4r-JLyE8pK0PVq2FrBGNX$ > > > > > > __ __ > > > > > > Start of short LC timer. Respond by Aug 19..____ > > > > > > __ __ > > > > > > - Shep____ > > > > > > (Chairs)____ > > > > Juniper Business Use Only > > > > > _______________________________________________ > > > BIER mailing list > > > BIER@ietf.org <mailto:BIER@ietf.org <BIER@ietf.org>> > > > > > > https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/bier > <https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/bier> > > > ______;!!NEt6yMaO-gk!Ws4otxDsuVKTsaEjyRKVYz-hcmmmGgDiE7CnpqvfA3s4r-JLy > > > E8pK0PVq8rXWgdg$ > > > > > > _______________________________________________ > > > BIER mailing list > > > BIER@ietf.org <mailto:BIER@ietf.org <BIER@ietf.org>> > > > > > > https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/bier > <https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/bier> > > > __;!!NEt6yMaO-gk!Ws4otxDsuVKTsaEjyRKVYz-hcmmmGgDiE7CnpqvfA3s4r-JLyE8pK > > > 0PVq9z6N_yR$ > > > > > > > > > > > > -- > > > > > > <https://urldefense.com/v3/__http://www.verizon.com/__;!!NEt6yMaO-gk!W > > > s4otxDsuVKTsaEjyRKVYz-hcmmmGgDiE7CnpqvfA3s4r-JLyE8pK0PVqyDf-6DB$ > > > > > > > *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/bier > <https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/bier> > > > __;!!NEt6yMaO-gk!Ws4otxDsuVKTsaEjyRKVYz-hcmmmGgDiE7CnpqvfA3s4r-JLyE8pK > > > 0PVq9z6N_yR$ > > > > > > > -- > > > > 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!Ws4otxDsuVKTsaEjyRKVYz-hcmmmGgDiE7CnpqvfA3s4r-JLyE8pK0PVq9z6N_yR$ > <https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/bier__;!!NEt6yMaO-gk!Ws4otxDsuVKTsaEjyRKVYz-hcmmmGgDiE7CnpqvfA3s4r-JLyE8pK0PVq9z6N_yR$> > > >
- 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
- Re: [Bier] WGLC: draft-ietf-bier-php Jeffrey (Zhaohui) Zhang
- Re: [Bier] WGLC: draft-ietf-bier-php Mankamana Mishra (mankamis)
- Re: [Bier] WGLC: draft-ietf-bier-php Gyan Mishra
- Re: [Bier] WGLC: draft-ietf-bier-php Loa Andersson
- Re: [Bier] WGLC: draft-ietf-bier-php Xiejingrong (Jingrong)
- Re: [Bier] WGLC: draft-ietf-bier-php Jeffrey (Zhaohui) Zhang
- Re: [Bier] WGLC: draft-ietf-bier-php Jeffrey (Zhaohui) Zhang
- Re: [Bier] WGLC: draft-ietf-bier-php Greg Mirsky
- Re: [Bier] WGLC: draft-ietf-bier-php Greg Shepherd
- Re: [Bier] WGLC: draft-ietf-bier-php Nagendra Kumar Nainar (naikumar)
- Re: [Bier] WGLC: draft-ietf-bier-php Gyan Mishra
- Re: [Bier] WGLC: draft-ietf-bier-php Greg Shepherd
- Re: [Bier] WGLC: draft-ietf-bier-php Loa Andersson
- Re: [Bier] WGLC: draft-ietf-bier-php Jeffrey (Zhaohui) Zhang
- Re: [Bier] WGLC: draft-ietf-bier-php Greg Shepherd
- Re: [Bier] WGLC: draft-ietf-bier-php Jeffrey (Zhaohui) Zhang
- Re: [Bier] WGLC: draft-ietf-bier-php Tony Przygienda
- Re: [Bier] WGLC: draft-ietf-bier-php Tony Przygienda