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Auto-Submitted: auto-generated Precedence: bulk Reply-To: bier@ietf.org Message-ID: <158335769461.29221.6267869233502740087@ietfa.amsl.com> Date: Wed, 04 Mar 2020 13:34:54 -0800 Archived-At: Subject: [Bier] I-D Action: draft-ietf-bier-use-cases-11.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Mar 2020 21:34:55 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Bit Indexed Explicit Replication WG of the IETF. Title : BIER Use Cases Authors : Nagendra Kumar Rajiv Asati Mach(Guoyi) Chen Xiaohu Xu Andrew Dolganow Tony Przygienda Arkadiy Gulko Dom Robinson Vishal Arya Caitlin Bestler Filename : draft-ietf-bier-use-cases-11.txt Pages : 17 Date : 2020-03-04 Abstract: Bit Index Explicit Replication (BIER) is an architecture that provides optimal multicast forwarding through a "BIER domain" without requiring intermediate routers to maintain any multicast related per- flow state. BIER also does not require any explicit tree-building protocol for its operation. A multicast data packet enters a BIER domain at a "Bit-Forwarding Ingress Router" (BFIR), and leaves the BIER domain at one or more "Bit-Forwarding Egress Routers" (BFERs). The BFIR router adds a BIER header to the packet. The BIER header contains a bit-string in which each bit represents exactly one BFER to forward the packet to. The set of BFERs to which the multicast packet needs to be forwarded is expressed by setting the bits that correspond to those routers in the BIER header. This document describes some of the use cases for BIER. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-bier-use-cases/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-bier-use-cases-11 https://datatracker.ietf.org/doc/html/draft-ietf-bier-use-cases-11 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-bier-use-cases-11 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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U1NjbHZsbzAwTHYyQ2tRZ3RydDNrclJvJTNEJmFtcDtyZXNlcnZlZD0wDQo+IA0KDQotLSANCg0K DQpMb2EgQW5kZXJzc29uICAgICAgICAgICAgICAgICAgICAgICAgZW1haWw6IGxvYUBwaS5udQ0K U2VuaW9yIE1QTFMgRXhwZXJ0DQpCcm9uemUgRHJhZ29uIENvbnN1bHRpbmcgICAgICAgICAgICAg cGhvbmU6ICs0NiA3MzkgODEgMjEgNjQNCg== From nobody Fri Mar 6 11:35:19 2020 Return-Path: X-Original-To: bier@ietf.org Delivered-To: bier@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 8C3203A087D; Fri, 6 Mar 2020 11:35:17 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: bier@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: bier@ietf.org Message-ID: <158352331747.2266.16300052481244086587@ietfa.amsl.com> Date: Fri, 06 Mar 2020 11:35:17 -0800 Archived-At: Subject: [Bier] I-D Action: draft-ietf-bier-mld-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Mar 2020 19:35:18 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Bit Indexed Explicit Replication WG of the IETF. Title : BIER Ingress Multicast Flow Overlay using Multicast Listener Discovery Protocols Authors : Pierre Pfister IJsbrand Wijnands Stig Venaas Cui(Linda) Wang Zheng(Sandy) Zhang Markus Stenberg Filename : draft-ietf-bier-mld-04.txt Pages : 16 Date : 2020-03-06 Abstract: This document specifies the ingress part of a multicast flow overlay for BIER networks. Using existing multicast listener discovery protocols, it enables multicast membership information sharing from egress routers, acting as listeners, toward ingress routers, acting as queriers. Ingress routers keep per-egress-router state, used to construct the BIER bit mask associated with IP multicast packets entering the BIER domain. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-bier-mld/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-bier-mld-04 https://datatracker.ietf.org/doc/html/draft-ietf-bier-mld-04 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-bier-mld-04 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon Mar 9 16:13:06 2020 Return-Path: X-Original-To: bier@ietf.org Delivered-To: bier@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 9BAE33A0867; Mon, 9 Mar 2020 16:13:04 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: bier@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.120.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: bier@ietf.org Message-ID: <158379558457.5595.2171315170183892704@ietfa.amsl.com> Date: Mon, 09 Mar 2020 16:13:04 -0700 Archived-At: Subject: [Bier] I-D Action: draft-ietf-bier-te-arch-07.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Mar 2020 23:13:05 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Bit Indexed Explicit Replication WG of the IETF. Title : Tree Engineering for Bit Index Explicit Replication (BIER-TE) Authors : Toerless Eckert Gregory Cauchie Michael Menth Filename : draft-ietf-bier-te-arch-07.txt Pages : 45 Date : 2020-03-09 Abstract: This memo introduces per-packet stateless strict and loose path steered replication and forwarding for Bit Index Explicit Replication packets (RFC8279). This is called BIER Tree Engineering (BIER-TE). BIER-TE can be used as a path steering mechanism in future Traffic Engineering solutions for BIER (BIER-TE). BIER-TE leverages RFC8279 and extends it with a new semantic for bits in the bitstring. BIER-TE can leverage BIER forwarding engines with little or no changes. In BIER, the BitPositions (BP) of the packets bitstring indicate BIER Forwarding Egress Routers (BFER), and hop-by-hop forwarding uses a Routing Underlay such as an IGP. In BIER-TE, BitPositions indicate adjacencies. The BIFT of each BFR are only populated with BPs that are adjacent to the BFR in the BIER- TE topology. The BIER-TE topology can consist of layer 2 or remote (routed) adjacencies. The BFR then replicates and forwards BIER packets to those adjacencies. This results in the aforementioned strict and loose path steering and replications. BIER-TE can co-exist with BIER forwarding in the same domain, for example by using separate BIER sub-domains. In the absence of routed adjacencies, BIER-TE does not require a BIER routing underlay, and can then be operated without requiring an Interior Gateway Routing protocol (IGP). BIER-TE operates without explicit in-network tree-state and carries the multicast distribution tree in the packet header. It can therefore be a good fit to support multicast path steering in Segment Routing (SR) networks. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-bier-te-arch/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-bier-te-arch-07 https://datatracker.ietf.org/doc/html/draft-ietf-bier-te-arch-07 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-bier-te-arch-07 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon Mar 9 19:37:01 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A76CB3A0CE2; Mon, 9 Mar 2020 19:36:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id x-KCjvNuQS9p; Mon, 9 Mar 2020 19:36:55 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7D9983A0D30; Mon, 9 Mar 2020 19:36:55 -0700 (PDT) Received: from LHREML711-CAH.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id D6F46EE12743AA120B77; Tue, 10 Mar 2020 02:36:53 +0000 (GMT) Received: from nkgeml708-chm.china.huawei.com (10.98.57.160) by LHREML711-CAH.china.huawei.com (10.201.108.34) with Microsoft SMTP Server (TLS) id 14.3.408.0; Tue, 10 Mar 2020 02:36:52 +0000 Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by nkgeml708-chm.china.huawei.com (10.98.57.160) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Tue, 10 Mar 2020 10:36:50 +0800 Received: from nkgeml705-chm.china.huawei.com ([10.98.57.154]) by nkgeml705-chm.china.huawei.com ([10.98.57.154]) with mapi id 15.01.1713.004; Tue, 10 Mar 2020 10:36:50 +0800 From: "Xiejingrong (Jingrong)" To: "bier-chairs@ietf.org" CC: BIER WG , "bier-ads@ietf.org" , "draft-xie-bier-ipv6-encapsulation@ietf.org" Thread-Topic: Request an adoption call on draft-xie-bier-ipv6-encapsulation-05 Thread-Index: AdXRi+HwR/otAFegSpCm1eKVbhIXMQk+DmBg Date: Tue, 10 Mar 2020 02:36:50 +0000 Message-ID: <0d7205da020b4e359214c99b538fdc4a@huawei.com> References: In-Reply-To: Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.202.118] Content-Type: multipart/alternative; boundary="_000_0d7205da020b4e359214c99b538fdc4ahuaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Bier] Request an adoption call on draft-xie-bier-ipv6-encapsulation-05 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Mar 2020 02:36:59 -0000 --_000_0d7205da020b4e359214c99b538fdc4ahuaweicom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dear WG Chairs, We've just updated a new revision of bier-ipv6-encapsulation. Main updates: 1. Use the Next Header value 143 for Ethernet packet in IP/IPv6. 2. Update the "security consideration" section. further includes: 2.1 Explain the BIER domain and BIER sub-domain that may spanning multiple = ASes operated by a single operator. 2.2 Simply refer the security considerations of Inter-domain deployment to = RFC8296, and remove the section 5.2 "Inter-domain deployment". https://datatracker.ietf.org/doc/draft-xie-bier-ipv6-encapsulation/ https://www.ietf.org/rfcdiff?url2=3Ddraft-xie-bier-ipv6-encapsulation-06 The first update about Next Header value 143 is based on the significant pr= ogress of Native IPv6 solution that is happening in industry, below for ref= erence: SRv6 PGM (in its LC) has applied the Proto value 143 for Ethernet packet in= IP/IPv6: https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming= / The second update is based on the Tony's comment before IETF106 about secur= ity deployment, and suggestion from Dirk recently. We hope this could address the concerns about security deployment of BIERv6= , as well as other comments received on IETF106: https://mailarchive.ietf.org/arch/msg/bier/1DP5hGPrPsiC3OE5skm2yaN6tQM/ Again, we believe this draft is stable and ready for adoption, and the BIER= WG charter item 7 "BIER natively in IPv6" should advance. Thank you very much for consideration! Best Regards, Jingrong From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Xiejingrong (Jingron= g) Sent: Thursday, January 23, 2020 9:27 AM To: bier-chairs@ietf.org Cc: BIER WG ; bier-ads@ietf.org; draft-xie-bier-ipv6-encapsu= lation@ietf.org Subject: [Bier] Request an adoption call on draft-xie-bier-ipv6-encapsulati= on-05 Dear WG Chairs: We would like to request an adoption call on draft-xie-bier-ipv6-encapsulat= ion-05. We've presented this proposal for about two years and it had led to the wri= ting and adoption of draft-ietf-bier-ipv6-requirements. We've addressed the comments received in the past 2 years. We've seen lots of interest on the draft. We believe it is stable and ready for adoption. We think the charter item 7 "BIER natively in IPv6" should advance. Thanks for consideration. BTW: I will be in spring festival for the coming 7 days but I can read the list = anytime. Happy spring festival to those who have. Jingrong (on behalf of the authors and contributors) --_000_0d7205da020b4e359214c99b538fdc4ahuaweicom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dear WG= Chairs,

&n= bsp;

We've j= ust updated a new revision of bier-ipv6-encapsulation. Main updates:

1. Use = the Next Header value 143 for Ethernet packet in IP/IPv6.

2. Upda= te the “security consideration” section. further includes:=

2.1 Exp= lain the BIER domain and BIER sub-domain that may spanning multiple ASes op= erated by a single operator.

2.2 Sim= ply refer the security considerations of Inter-domain deployment to RFC8296= , and remove the section 5.2 “Inter-domain deployment”.

https://datatracker.ietf.o= rg/doc/draft-xie-bier-ipv6-encapsulation/

https://www.ietf.org/rfcdiff?url2=3Ddraft-xie-bier-ipv6-encapsulation-06=

&n= bsp;

The fir= st update about Next Header value 143 is based on the significant progress = of Native IPv6 solution that is happening in industry, below for reference:=

SRv6 PG= M (in its LC) has applied the Proto value 143 for Ethernet packet in IP/IPv= 6:

https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-prog= ramming/

&n= bsp;

The sec= ond update is based on the Tony’s comment before IETF106 about securi= ty deployment, and suggestion from Dirk recently.

We hope= this could address the concerns about security deployment of BIERv6, as we= ll as other comments received on IETF106:

https://mailarchive.ietf.org/arch/msg/bier/1DP5hGPrPsiC3OE5skm2yaN6tQM/

&n= bsp;

Again, = we believe this draft is stable and ready for adoption, and the BIER WG cha= rter item 7 "BIER natively in IPv6" should advance.

Thank y= ou very much for consideration!

&n= bsp;

Best Re= gards,

Jingron= g

&n= bsp;

&n= bsp;

From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Xiejingrong (Jingrong)
Sent: Thursday, January 23, 2020 9:27 AM
To: bier-chairs@ietf.org
Cc: BIER WG <bier@ietf.org>; bier-ads@ietf.org; draft-xie-bier= -ipv6-encapsulation@ietf.org
Subject: [Bier] Request an adoption call on draft-xie-bier-ipv6-enca= psulation-05

 

Dear WG Chairs:

 

We would like to request an ado= ption call on draft-xie-bier-ipv6-encapsulation-05.

We've presented this proposal f= or about two years and it had led to the writing and adoption of draft-ietf= -bier-ipv6-requirements.

We've addressed the comments re= ceived in the past 2 years.

We've seen lots of interest on = the draft.

We believe it is stable and rea= dy for adoption.

We think the charter item 7 &qu= ot;BIER natively in IPv6" should advance.

 

Thanks for consideration.<= /o:p>

 

BTW:

I will be in spring festival fo= r the coming 7 days but I can read the list anytime.

Happy spring festival to those = who have.

 

Jingrong (on behalf of the auth= ors and contributors)

 

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boundary="_000_7ef04ecc04414919bcf305151237ea55huaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Bier] Request an adoption call on draft-xie-bier-ipv6-encapsulation-05 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Mar 2020 07:57:14 -0000 --_000_7ef04ecc04414919bcf305151237ea55huaweicom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 RGVhciBTYW5keSwNCg0KV2l0aCBhbGwgZHVlIHJlc3BlY3QsIEkgYW0gY3VyaW91cyB3aGV0aGVy IHlvdSBzcGVhayBhcyBpbmRpdmlkdWFsIG9yIFdHIHNlY3JldGFyeS4NCg0KTW9yZSBjb21tZW50 cyBpbmxpbmUuDQoNClRoYW5rcw0KSmluZ3JvbmcNCg0KRnJvbTogemhhbmcuemhlbmdAenRlLmNv bS5jbiBbbWFpbHRvOnpoYW5nLnpoZW5nQHp0ZS5jb20uY25dDQpTZW50OiBUdWVzZGF5LCBNYXJj aCAxMCwgMjAyMCAyOjU3IFBNDQpUbzogWGllamluZ3JvbmcgKEppbmdyb25nKSA8eGllamluZ3Jv 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IkVOLVVTIj4mbmJzcDs8bzpwPjwvbzpwPjwvc3Bhbj48L3A+PC9kaXY+PC9kaXY+PC9kaXY+PC9k aXY+PC9kaXY+PC9kaXY+PC9kaXY+PHA+PHNwYW4gbGFuZz0iRU4tVVMiPjxvOnA+Jm5ic3A7PC9v OnA+PC9zcGFuPjwvcD48L2Rpdj48L2Rpdj48L2Rpdj48L2Rpdj48L2Rpdj48L2Rpdj48L2Rpdj48 L2Rpdj48cD48YnI+PC9wPjwvZGl2Pg== --=====_003_next=====-- --=====_002_next=====-- --=====_001_next=====-- From nobody Tue Mar 10 03:15:20 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6279C3A0FCA; Tue, 10 Mar 2020 03:15:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.898 X-Spam-Level: X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 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([10.98.57.154]) by nkgeml705-chm.china.huawei.com ([10.98.57.154]) with mapi id 15.01.1713.004; Tue, 10 Mar 2020 18:15:05 +0800 From: "Xiejingrong (Jingrong)" To: "zhang.zheng@zte.com.cn" CC: "bier-chairs@ietf.org" , "bier@ietf.org" , "bier-ads@ietf.org" , "draft-xie-bier-ipv6-encapsulation@ietf.org" Thread-Topic: Re:Request an adoption call ondraft-xie-bier-ipv6-encapsulation-05 Thread-Index: AQHV9rpzfPS9EwAegUu0w/JSmC2R/qhBmHUw Date: Tue, 10 Mar 2020 10:15:05 +0000 Message-ID: <5fdea958d2d146439d36e4b604e32abd@huawei.com> References: 202003101457082239409@zte.com.cn, 7ef04ecc04414919bcf305151237ea55@huawei.com <202003101658540714229@zte.com.cn> In-Reply-To: <202003101658540714229@zte.com.cn> Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.202.118] Content-Type: multipart/alternative; boundary="_000_5fdea958d2d146439d36e4b604e32abdhuaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Bier] Request an adoption call ondraft-xie-bier-ipv6-encapsulation-05 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Mar 2020 10:15:16 -0000 --_000_5fdea958d2d146439d36e4b604e32abdhuaweicom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 RGVhciBTYW5keSwNCg0KSSBzdXBwb3NlIEkgaGF2ZSBhZGRyZXNzZWQgYWxsIHRoZSBjb21tZW50 cyByZWNlaXZlZCBvbiB0aGUgZHJhZnQteGllLWJpZXItaXB2Ni1lbmNhcHN1bGF0aW9uLCBhbmQg dGhhdOKAmXMgdGhlIG1haW4gcG9pbnQgaW4gbXkgcmVxdWVzdCBvZiBhZG9wdGlvbiBpbiBKYW4g MjAyMCBhbmQgdG9kYXkuDQpQbGVhc2UgcG9pbnQgb3V0IHdoYXTigJlzIHRoZSBjb21tZW50cyB0 aGF0IGhhdmVu4oCZdCBhZGRyZXNzZWQuDQoNClRoYW5rcyBmb3IgcmVtaW5kIG1lIHRoZSBJRVRG MTA1IG1lZXRpbmcgbWludXRlcy4NCkkgZG9u4oCZdCBrbm93IHdoeSB0aGF0IHNhaWQgdGhpbmcg 4oCcVGFrZSBpdCB0byBsaXN04oCdIGRpZG7igJl0IGhhcHBlbiBhZnRlciA3IG1vbnRocyAhDQpJ 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d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=K21f94M7SFkcRZ9L4IgDjSb3teDgnP226LfVjGawq74=; b=D9o189bmcy+Jcgc4iyHy6itYKenKcs/bPX5LaCJJtNQqP44lOkI6+TS23QlLjWINnJ 57yxg30M+hZuoMVHXbCt5+gv5rJ6kvIJcc3WpF6xuj3cDZbhmu7ZtS+NA1100MH0CBL4 WeE7jzWEKVxYxJ7IDidwGjwhb3UxzDBb7vU7avhcrVAf8aFlDsNohDHxv11Nv9X3Om26 Ap6zuDu++JF9yNfb8VhW47jZliLdSZxAbkO1zRCfJEBc+ytmSeHXnhqEt/Op40EmsWy1 J61hvQVfx0hNLOFbQTE2oERC4i52QsBK8CuUfXO1OQZKMIWwyQcFyyQiBq8+nCb/FH4P phpg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=K21f94M7SFkcRZ9L4IgDjSb3teDgnP226LfVjGawq74=; b=WR9xIlcWYMjJZMDfaz1Ajcul8L+uKce3ugKmsinadt1gHULMXLKatAxrkYZdRg1NVH ewIX+O4ArboOIwYomwfWWG+RSf2KUDhRAah7sXZHe4x7jtjpUdvczYPSu7LhX/97W8v3 DqM8kwXm+9y/xQGOFMqDsTPuYDFOnqKyXZfAPlFb+/O5UJ1Hcz3/s56l/vgbuZ1OMmaH TBNMkSMRAiz+lJVg319i2fgTscBpk6Fp+1Kq89mf9rVLsbhp5TTSNCBiYwrMB9y1cxmQ ZSp80Wm1BsYb1H7VFejQ9zI2tnGXnFkOM1JDrhQA0kgo8AuWxO1IUtPQtN+zv+0M6JDv ea/w== X-Gm-Message-State: ANhLgQ0HVRjjsiB39c0lZCOPksKs+ZfKj+pprCMZgjBFQccEDn3KLVI1 xJWJA7tellsX/iKFj3NovyRQXLSGLbVuTFJ01xZvQtnu X-Google-Smtp-Source: ADFU+vvXNIdMOnbB8TWN9ag07fD9QCo9PDYzpRSeJvxvLbgvLp6RHPdrW/19RrIIPAkLOcoUEY1hHFTXLV6rArjWXIY= X-Received: by 2002:a6b:a08:: with SMTP id z8mr9889337ioi.174.1583851503748; Tue, 10 Mar 2020 07:45:03 -0700 (PDT) MIME-Version: 1.0 References: <5fdea958d2d146439d36e4b604e32abd@huawei.com> <202003102210042651244@zte.com.cn> In-Reply-To: <202003102210042651244@zte.com.cn> From: Tony Przygienda Date: Tue, 10 Mar 2020 07:43:34 -0700 Message-ID: To: "zhang.zheng" Cc: Xiejingrong , BIER WG Chairs , BIER WG , bier-ads@ietf.org, draft-xie-bier-ipv6-encapsulation@ietf.org Content-Type: multipart/alternative; boundary="000000000000420b5805a0812a0e" Archived-At: Subject: Re: [Bier] Request an adoption call ondraft-xie-bier-ipv6-encapsulation-05 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Mar 2020 14:45:08 -0000 --000000000000420b5805a0812a0e Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I will try to get on call with Greg this week if we manage to find the time and we'll look @ the minutes/new version of draft and direct further ... thanks --- tony On Tue, Mar 10, 2020 at 7:10 AM wrote: > Hi Jingrong, > > > Sorry, I don't know you can't remember that there is consensus with the > irrelevance between BIER and SRv6. > > SRv6 doesn't exist in BIER charter at all. So I mention it again for > draft-xie-bier-ipv6-encapsulation. > > > The homenet is one of the deployment of BIERin6 (draft-zhang-bier-bierin6 > ). > > About the draft process, I believe that chair control the WG process > reasonably. > > > Thanks, > > Sandy > > > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*Xiejingrong(Jingrong) > *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E5=BC=A0=E5=BE=8100007940; > *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*bier-chairs@ietf.org ;bier@ietf.org < > bier@ietf.org>;bier-ads@ietf.org ; > draft-xie-bier-ipv6-encapsulation@ietf.org < > draft-xie-bier-ipv6-encapsulation@ietf.org>; > *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8810=E6=97=A5 18:15 > *=E4=B8=BB =E9=A2=98 =EF=BC=9A**RE: Re:Request an adoption call > ondraft-xie-bier-ipv6-encapsulation-05* > > Dear Sandy, > > > > I suppose I have addressed all the comments received on the > draft-xie-bier-ipv6-encapsulation, and that=E2=80=99s the main point in m= y request > of adoption in Jan 2020 and today. > > Please point out what=E2=80=99s the comments that haven=E2=80=99t address= ed. > > > > Thanks for remind me the IETF105 meeting minutes. > > I don=E2=80=99t know why that said thing =E2=80=9CTake it to list=E2=80= =9D didn=E2=80=99t happen after 7 > months ! > > Is it assumed that some questions are not addressed or not clear ---- for > example, security considerations? Or the said =E2=80=9CPrimary intended u= se is > HOMENET=E2=80=9D does not explicitly declared in the document ? > > > > Thanks > > Jingrong > > > > *From:* zhang.zheng@zte.com.cn [mailto:zhang.zheng@zte.com.cn] > *Sent:* Tuesday, March 10, 2020 4:59 PM > *To:* Xiejingrong (Jingrong) > *Cc:* bier-chairs@ietf.org; bier@ietf.org; bier-ads@ietf.org; > draft-xie-bier-ipv6-encapsulation@ietf.org > *Subject:* Re:Request an adoption call > ondraft-xie-bier-ipv6-encapsulation-05 > > > > Hi Jingrong, > > > > Before being in adoption call, you may need to solve all the question > about (draft-xie-bier-ipv6-encapsulation) at first (in meeting and > mailing list). > > Its a pit that you didn't konw the consensus withdraft-zhang-bier-bierin6 > even if you were on BIER WG bluesheet in IETF105# ( > https://www.ietf.org/proceedings/105/bluesheets/bluesheets-105-bier-20190= 7241330-00.pdf > ). > > Please have a look at the minutes again ( > https://tools.ietf.org/wg/bier/minutes?item=3Dminutes-105-bier-01.html). > > I think it's a baseline that the draft has gotten consensus in WG before > it's taken to the adoption list. > > > > BTW: You may have misunderstanding about WG secretary. > > AFAIK, WG secretary just does WG routine work, and there is no > relationship with technology discussion and routine work. > > Let's back to the technology discussion. Thanks! > > > > Thanks > > Sandy > > > > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 > > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*Xiejingrong(Jingrong) > > *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E5=BC=A0=E5=BE=8100007940; > > *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*bier-chairs@ietf.org ;bier@ietf.org < > bier@ietf.org>;bier-ads@ietf.org ; > draft-xie-bier-ipv6-encapsulation@ietf.org < > draft-xie-bier-ipv6-encapsulation@ietf.org>; > > *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8810=E6=97=A5 15:57 > > *=E4=B8=BB =E9=A2=98 =EF=BC=9ARE: Re:Request an adoption call > ondraft-xie-bier-ipv6-encapsulation-05* > > Dear Sandy, > > > > With all due respect, I am curious whether you speak as individual or WG > secretary. > > > > More comments inline. > > > > Thanks > > Jingrong > > > > *From:*zhang.zheng@zte.com.cn [mailto:zhang.zheng@zte.com.cn > ] > *Sent:* Tuesday, March 10, 2020 2:57 PM > *To:* Xiejingrong (Jingrong) > *Cc:* bier-chairs@ietf.org; bier@ietf.org; bier-ads@ietf.org; > draft-xie-bier-ipv6-encapsulation@ietf.org > *Subject:* Re:Request an adoption call on > draft-xie-bier-ipv6-encapsulation-05 > > > > Hi Jingrong, > > > > I don't think this solution (draft-xie-bier-ipv6-encapsulation) has gotte= n > consensus in BIER working group. > > [XJR] I think an adoption call is to verify the existence of consensus, > rather than reverse. > > However, there is another BIER IPv6 solution (draft-zhang-bier-bierin6) > has gotten consensus in the WG. > > [XJR] This claim of consensus looks even more strange to me, as you are > one author of this draft, and also the secretary of BIER WG. I believe on= ly > WG chairs or AD can declare such consensus. > > The latest presentation is in IETF105# and it has been in adoption list. > > BTW: I don't think there is straight relationship with BIER and SRv6. > But draft-zhang-bier-bierin6 works well with SRv6 without any extra > specification. > > > > Thanks > > Sandy > > > > > > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 > > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*Xiejingrong(Jingrong) > > *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*bier-chairs@ietf.org ; > > *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*BIER WG ;bier-ads@ie= tf.org ; > draft-xie-bier-ipv6-encapsulation@ietf.org < > draft-xie-bier-ipv6-encapsulation@ietf.org>; > > *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8810=E6=97=A510:37 > > *=E4=B8=BB =E9=A2=98 =EF=BC=9ARE: Request an adoption call on draft-xie-b= ier-ipv6-encapsulation-05* > > Dear WG Chairs, > > > > We've just updated a new revision of bier-ipv6-encapsulation. Main update= s: > > 1. Use the Next Header value 143 for Ethernet packet in IP/IPv6. > > 2. Update the =E2=80=9Csecurity consideration=E2=80=9D section. further i= ncludes: > > 2.1 Explain the BIER domain and BIER sub-domain that may spanning multipl= e > ASes operated by a single operator. > > 2.2 Simply refer the security considerations of Inter-domain deployment t= o > RFC8296, and remove the section 5.2 =E2=80=9CInter-domain deployment=E2= =80=9D. > > https://datatracker.ietf.org/doc/draft-xie-bier-ipv6-encapsulation/ > > https://www.ietf.org/rfcdiff?url2=3Ddraft-xie-bier-ipv6-encapsulation-06 > > > > The first update about Next Header value 143 is based on the significant > progress of Native IPv6 solution that is happening in industry, below for > reference: > > SRv6 PGM (in its LC) has applied the Proto value 143 for Ethernet packet > in IP/IPv6: > > > https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programmi= ng/ > > > > The second update is based on the Tony=E2=80=99s comment before IETF106 a= bout > security deployment, and suggestion from Dirk recently. > > We hope this could address the concerns about security deployment of > BIERv6, as well as other comments received on IETF106: > > https://mailarchive.ietf.org/arch/msg/bier/1DP5hGPrPsiC3OE5skm2yaN6tQM/ > > > > Again, we believe this draft is stable and ready for adoption, and the > BIER WG charter item 7 "BIER natively in IPv6" should advance. > > Thank you very much for consideration! > > > > Best Regards, > > Jingrong > > > > > > *From:* BIER [mailto:bier-bounces@ietf.org ]*On > Behalf Of *Xiejingrong (Jingrong) > *Sent:* Thursday, January 23, 2020 9:27 AM > *To:* bier-chairs@ietf.org > *Cc:* BIER WG ;bier-ads@ietf.org; > draft-xie-bier-ipv6-encapsulation@ietf.org > *Subject:* [Bier] Request an adoption call on > draft-xie-bier-ipv6-encapsulation-05 > > > > Dear WG Chairs: > > > > We would like to request an adoption call on > draft-xie-bier-ipv6-encapsulation-05. > > We've presented this proposal for about two years and it had led to the > writing and adoption of draft-ietf-bier-ipv6-requirements. > > We've addressed the comments received in the past 2 years. > > We've seen lots of interest on the draft. > > We believe it is stable and ready for adoption. > > We think the charter item 7 "BIER natively in IPv6" should advance. > > > > Thanks for consideration. > > > > BTW: > > I will be in spring festival for the coming 7 days but I can read the lis= t > anytime. > > Happy spring festival to those who have. > > > > Jingrong (on behalf of the authors and contributors) > > > > > > > > > --000000000000420b5805a0812a0e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I will try to get on call with Greg this week if we m= anage to find the time and we'll look=C2=A0@ the minutes/new version of= draft and direct further ...

thanks

--- tony

On Tue, Mar 10, 2020 at 7:10 AM &l= t;zhang.zheng@zte.com.cn> = wrote:

Hi Jingrong,


Sorry, I don't know you can't remember that there is consen= sus with the irrelevance between BIER and SRv6.=C2=A0

SRv6 doesn't exist in BIER charter at all.= =C2=A0So I mention it ag= ain for=C2=A0draft-xie-bier-ipv6-encapsulation<= /span>.=C2=A0


The homenet is one of the deploym= ent of BIERin6 (draft-zhang-bier-bierin6= ).

About the draft process, I believe that = chair control the WG process reasonably.


Thanks= ,

Sandy


=E5=8E=9F=E5=A7=8B=E9= =82=AE=E4=BB=B6
=
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AXiejingrong= (Jingrong) <= xiejingrong@huawei.com>
=E6=94=B6=E4=BB=B6= =E4=BA=BA=EF=BC=9A=E5=BC=A0=E5=BE= =8100007940;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2020= =E5=B9=B403=E6=9C=8810=E6=97=A5 18:15
=E4=B8=BB = =E9=A2=98 =EF=BC=9ARE: Re:Request an adoption call o= ndraft-xie-bier-ipv6-encapsulation-05
=

Dear Sandy= ,

=C2=A0

I suppose I have addressed all the comments rece= ived on the draft-xie-bier-ipv6-encapsulation, and that=E2=80=99s the main = point in my request of adoption in Jan 2020 and today.

Please point out what=E2=80=99s the commen= ts that haven=E2=80=99t addressed.

=C2=A0

=

Thanks for remi= nd me the IETF105 meeting minutes.

I don=E2=80=99t know why that s= aid thing =E2=80=9CTake it to list=E2=80=9D didn=E2=80=99t happen after 7 m= onths !

Is it assumed that some questions are not addressed or not= clear ---- for example, security considerations? Or the said =E2=80=9CPrim= ary intended use is HOMENET=E2=80=9D does not explicitly declared in the document ?<= /u>

<= u>=C2=A0

Thanks

Jingrong

=C2=A0

From: zha= ng.zheng@zte.com.cn [mailto:zhang.zheng@zte.com.cn]
Sent: Tues= day, March 10, 2020 4:59 PM
To: Xiejingrong (Jingrong) = <xiejingrong= @huawei.com>
Cc: bier-chairs@ietf.org; bier@ietf.org; bier-ads@ietf.org; draft-xie-bier-ipv6= -encapsulation@ietf.org
Subject: Re:Request an adop= tion call ondraft-xie-bier-ipv6-encapsulation-05

=C2=A0

Hi Jingrong,

<= u>=C2=A0

Before being in adoption cal= l, you may need to solve all the question about (draft-xie-bier-ipv6-encapsulation) a= t first (in meeting and mailing list).

Its a pit that you didn= 9;t konw the consensus withdraft-zhang-bier-bierin6 even if you were=C2=A0on BIER WG = bluesheet in IETF105# (https://w= ww.ietf.org/proceedings/105/bluesheets/bluesheets-105-bier-201907241330-00.= pdf).

Please have a look at the minutes again (https://tools.ietf.org/wg/bier/minutes?item=3Dminutes-105-bier-= 01.html).=

I think it's a baseline that the dra= ft has gotten consensus in WG before it's taken to the adoption list.

=C2=A0

<= span style=3D"font-size:10.5pt;font-family:"Arial",sans-serif" la= ng=3D"EN-US">BTW: You may have misunderstanding about WG secretary.<= u>

AFAIK, WG secretary just does WG routine = work, and there is no relationship with technology discussion and routine w= ork.

Let's back to the technol= ogy discussion. Thanks!

=C2= =A0

Thanks

Sandy

=C2=A0<= /u>

=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6

=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC= =9AXiejingrong(Jingrong) <xiejingrong@huawei= .com>

= =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E5=BC=A0=E5=BE= =8100007940;=

=E6=97=A5 =E6=9C=9F =EF=BC=9A= 2020=E5=B9=B403=E6=9C=8810=E6=97=A5 = 15:57

=E4=B8=BB =E9=A2=98 =EF=BC=9ARE: Re:Request an adoption call ondraft-xie-bier-ipv6-encapsulation-= 05

Dear Sandy,

=C2=A0

With all due respect, I am curious whether you sp= eak as individual or WG secretary.

=C2= =A0

More comments inline.

=C2=A0<= /span>

Thank= s

Jingrong=

=C2=A0

From:= zhang.zheng@zte= .com.cn [ma= ilto:zhang.zheng@zte.com.cn]
Sent: Tuesday, March 10, 2020 2= :57 PM
To: Xiejingrong (Jingrong) <xiejingrong@huawei.com>
Cc: bier-chairs@= ietf.org; bier@ietf.= org; bier-ads@ie= tf.org; draft-xie-bier-ipv6-encapsulation@ietf.org
= Subject:<= /strong> Re:Request an adoption call on draft-xie-bier-ipv6-encapsulation-0= 5

=C2=A0

Hi Jingrong,

=C2=A0

I don't think this solution (draft-xie-bier-ipv6-encapsulation) h= as gotten consensus in BIER working group.

[XJR] I think an adoption call is to verify the existence of consensus,= rather than reverse.

<= p style=3D"margin:0cm 0cm 0.0001pt;line-height:15pt;background:white none r= epeat scroll 0% 0%;box-sizing:border-box;min-height:14px;outline:currentcol= or none 0px">However, there is another BIER IPv6 solution (draft-zhang-bier-b= ierin6) has gotten consensus in the WG.=C2=A0

[XJR] This claim of consensus looks even more strange to me, as you = are one author of this draft, and also the secretary of BIER WG. I believe only WG chairs or= AD=C2=A0 can declare such=C2=A0 consensus.<= /u>

The latest presentation is in IETF105# and = it has been in adoption list.

BTW: I don't think there is straight relationship wit= h BIER and SRv6. But=C2=A0draft-zhang-bier-bierin6 works well with SRv6 wit= hout any extra specification.

=C2=A0

Thanks

Sandy

=C2=A0

=C2=A0

=

=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6

=E6=97=A5 =E6=9C=9F =EF= =BC=9A2020=E5=B9=B403=E6=9C=8810=E6=97=A510:37

<= span style=3D"font-family:=E5=AE=8B=E4=BD=93">=E4=B8=BB =E9=A2=98 =EF=BC=9A= RE: Request an adoption call on draft-xie-bier-ipv6-en= capsulation-05

Dear WG Chairs,

=C2=A0

We've just updated a new revision of bier-ipv6-encapsulatio= n. Main updates:

1. Use= the Next Header value 143 for Ethernet packet in IP/IPv6.

2. Update the =E2=80=9Csecurity conside= ration=E2=80=9D section. further includes:

2.1 Explain the BIER domain and BIER sub-domain that ma= y spanning multiple ASes operated by a single operator.

2.2 Simply refer the security consideratio= ns of Inter-domain deployment to RFC8296, and remove the section 5.2 =E2=80= =9CInter-domain deployment=E2=80=9D.<= /u>

https://datatracker.ietf.org/doc/draft-xie-bier-ipv6-encapsulation/

https://www.ietf.org= /rfcdiff?url2=3Ddraft-xie-bier-ipv6-encapsulation-06

=C2=A0

The first update about Next Header value 143 is based o= n the significant progress of Native IPv6 solution that is happening in ind= ustry, below for reference:

<= p class=3D"MsoNormal">S= Rv6 PGM (in its LC) has applied the Proto value 143 for Ethernet packet in = IP/IPv6:

https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-n= etwork-programming/

=C2=A0

The second upda= te is based on the Tony=E2=80=99s comment before IETF106 about security dep= loyment, and suggestion from Dirk recently.<= /u>

We hope this could address the concerns about security= deployment of BIERv6, as well as other comments received on IETF106:

h= ttps://mailarchive.ietf.org/arch/msg/bier/1DP5hGPrPsiC3OE5skm2yaN6tQM/<= /span>

= =C2=A0

Again, we believe this draft is stable = and ready for adoption, and the BIER WG charter item 7 "BIER natively = in IPv6" should advance.

Thank you very much for consideration!

=C2=A0

Best Regards,

Ji= ngrong

=C2=A0

=C2=A0

From: BIER [mailto:bier-bounces@ietf.o= rg]On Behalf Of Xiejingrong (Jingrong)
Sent: Thursday, January 23= , 2020 9:27 AM
To= : bier-chairs@ietf.org
Cc: BIER WG <bier@ietf.org>;bier-ads@ietf.org;draft-xie-bier-ipv6-encapsu= lation@ietf.org
Subject: [Bier] Request an adoption call on draft-xie-= bier-ipv6-encapsulation-05=

=C2=A0

Dear WG Chairs:=

=C2=A0=

We wou= ld like to request an adoption call on draft-xie-bier-ipv6-encapsulation-05= .

We= 9;ve presented this proposal for about two years and it had led to the writ= ing and adoption of draft-ietf-bier-ipv6-requirements.=

We've addressed the com= ments received in the past 2 years.

We've seen lots of interest on the draft.<= u>

We beli= eve it is stable and ready for adoption.

We think the charter item 7 "BIER = natively in IPv6" should advance.

=C2=A0

Thanks for consideration.

=C2=A0

BTW:

I will be in spring festiv= al for the coming 7 days but I can read the list anytime.

Happy spring festival to= those who have.

=C2=A0

Jingrong (on behalf of the authors and contributors)

=C2=A0

=C2=A0

=C2=A0

=


--000000000000420b5805a0812a0e-- From nobody Tue Mar 10 07:51:23 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9D9313A147E; Tue, 10 Mar 2020 07:51:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id au-1Gf37YZsT; Tue, 10 Mar 2020 07:51:18 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 022EC3A147B; Tue, 10 Mar 2020 07:51:18 -0700 (PDT) Received: from lhreml701-cah.china.huawei.com (unknown [172.18.7.106]) by Forcepoint Email with ESMTP id 498EAF7A340F7CC63101; Tue, 10 Mar 2020 14:51:15 +0000 (GMT) Received: from nkgeml704-chm.china.huawei.com (10.98.57.158) by lhreml701-cah.china.huawei.com (10.201.108.42) with Microsoft SMTP Server (TLS) id 14.3.408.0; Tue, 10 Mar 2020 14:51:14 +0000 Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by nkgeml704-chm.china.huawei.com (10.98.57.158) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Tue, 10 Mar 2020 22:51:12 +0800 Received: from nkgeml705-chm.china.huawei.com ([10.98.57.154]) by nkgeml705-chm.china.huawei.com ([10.98.57.154]) with mapi id 15.01.1713.004; Tue, 10 Mar 2020 22:51:12 +0800 From: "Xiejingrong (Jingrong)" To: "zhang.zheng@zte.com.cn" CC: "bier-chairs@ietf.org" , "bier@ietf.org" , "bier-ads@ietf.org" , "draft-xie-bier-ipv6-encapsulation@ietf.org" Thread-Topic: Re:Request an adoption call ondraft-xie-bier-ipv6-encapsulation-05 Thread-Index: AQHV9rpzfPS9EwAegUu0w/JSmC2R/qhBmHUw//+/KgCAAJBb4A== Date: Tue, 10 Mar 2020 14:51:11 +0000 Message-ID: References: 202003101658540714229@zte.com.cn, 5fdea958d2d146439d36e4b604e32abd@huawei.com <202003102210042651244@zte.com.cn> In-Reply-To: <202003102210042651244@zte.com.cn> Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.45.162.208] Content-Type: multipart/alternative; boundary="_000_cee09bb4a80a4761ab0544c2b63f2448huaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Bier] Request an adoption call ondraft-xie-bier-ipv6-encapsulation-05 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Mar 2020 14:51:21 -0000 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--_000_aa17fc40d1b44047ac17d9c4aff7509fhuaweicom_-- From nobody Tue Mar 10 16:20:07 2020 Return-Path: X-Original-To: bier@ietf.org Delivered-To: bier@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id B277E3A08B7; Tue, 10 Mar 2020 16:20:05 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Secretariat To: , , X-Test-IDTracker: no X-IETF-IDTracker: 6.120.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <158388240569.15923.621344666136501635@ietfa.amsl.com> Date: Tue, 10 Mar 2020 16:20:05 -0700 Archived-At: Subject: [Bier] The BIER WG has placed draft-jholland-mboned-ambi in state "Adopted by a WG" X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Mar 2020 23:20:06 -0000 The BIER WG has placed draft-jholland-mboned-ambi in state Adopted by a WG (entered by Greg Shepherd) The document is available at https://datatracker.ietf.org/doc/draft-jholland-mboned-ambi/ From nobody Tue Mar 10 16:21:25 2020 Return-Path: X-Original-To: bier@ietf.org Delivered-To: bier@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id A5B2E3A08DB; Tue, 10 Mar 2020 16:21:23 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Secretariat To: , , X-Test-IDTracker: no X-IETF-IDTracker: 6.120.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <158388248366.15836.11491996239516869595@ietfa.amsl.com> Date: Tue, 10 Mar 2020 16:21:23 -0700 Archived-At: Subject: [Bier] The BIER WG has placed draft-jholland-mboned-cbacc in state "Adopted by a WG" X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Mar 2020 23:21:24 -0000 The BIER WG has placed draft-jholland-mboned-cbacc in state Adopted by a WG (entered by Greg Shepherd) The document is available at https://datatracker.ietf.org/doc/draft-jholland-mboned-cbacc/ From nobody Tue Mar 10 16:21:48 2020 Return-Path: X-Original-To: bier@ietf.org Delivered-To: bier@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 55E203A08E8; Tue, 10 Mar 2020 16:21:47 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Secretariat To: , , X-Test-IDTracker: no X-IETF-IDTracker: 6.120.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <158388250733.15670.6498202231449090400@ietfa.amsl.com> Date: Tue, 10 Mar 2020 16:21:47 -0700 Archived-At: Subject: [Bier] The BIER WG has placed draft-jholland-mboned-dorms in state "Adopted by a WG" X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Mar 2020 23:21:48 -0000 The BIER WG has placed draft-jholland-mboned-dorms in state Adopted by a WG (entered by Greg Shepherd) The document is available at https://datatracker.ietf.org/doc/draft-jholland-mboned-dorms/ From nobody Wed Mar 11 15:13:14 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4A1CA3A0778; Wed, 11 Mar 2020 15:13:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.87 X-Spam-Level: X-Spam-Status: No, score=-0.87 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZUe_wRTpQEp6; Wed, 11 Mar 2020 15:13:09 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 40C873A077E; Wed, 11 Mar 2020 15:13:03 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [131.188.34.52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id D75B854842F; Wed, 11 Mar 2020 23:12:57 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id CF30F440040; Wed, 11 Mar 2020 23:12:57 +0100 (CET) Date: Wed, 11 Mar 2020 23:12:57 +0100 From: Toerless Eckert To: bier@ietf.org Cc: draft-ietf-bier-te-arch.ad@ietf.org Message-ID: <20200311221257.GA2331@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: [Bier] BIER-TE -07 uploaded (was: Re: Pls "vote" on name (draft-ietf-bier-te-arch)) X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 11 Mar 2020 22:13:13 -0000 Thanks for everybody chiming into the WG last call of this document, i hope the chairs can declare it to have successfully finished WG work now and pass it to the responsible AD for further IETF processing: I did push the -07 update to the draft that changes the name to BIER-TE "Tree Engineering" as shown to be the consensus of the WG. I btw. also like "Tree Engineering" the most, but did not suggest it initially, in an attempt to satisfy Debra's concern, but also agree very much with what Greg said about the point. Also, see my email reply to Debra early and the points it made. -07 also includes explanation about that name change and the relationship to "Traffic Engineering" as a note on top of the document marked for removal by RFC-editor, so that further reviews by AD/IETF/IESG can be on top of the these two points without the need to argue about the RFC viability of such explanations (was not sure everybody reads changelog). I had hoped to receive a followup from Lou re. his suggestion for additional text about "Traffic Engineering". I also polled him in PM last week, but no further reply. This is not a complained, i know how everybody is busy, but i think if he wants to provide further simple text to provide additional documentation for that relationship, then he can always do it still in IETF review. Nevertheless, i feel it would be more appropriate to take relationships about Tree Engineering and Traffic Engineering to the proposed TEAS BIER-TE framework document, which i am happy to revive and improve upon after this draft is an RFC. Especially also given Alias guidance when we adopted the document in the WG, that traffic engineering must be done in TEAS and that BIER should only do the BIER related forwarding plane aspects. Which is exactly what the document does. IMHO, there are no further "Traffic Engineering" considerations that would change any technical aspects of this document. As i explained in another email, both BIER and BIER-TE could be part of a traffic engineering as i understand the options. BIER of course being more limited by the path steering solution it is combined with, like Flex-Algos). Hence i feel further "Traffic Engineering" aspects would be misplaced in this document anyhow. Cheers Toerless On Mon, Mar 02, 2020 at 03:56:51PM +0800, zhang.zheng@zte.com.cn wrote: > +1. > > > Seems like the previous mail has been lost. So I sent the mail again. > > > > > > > Thanks, > > > Sandy > > > > > > > > > > > > > > > > > > > ???????????? > > > > ????????????GregShepherd > ????????????Acee Lindem (acee) ; > ????????????Dirk Trossen ;bier@ietf.org ;bier-ads@ietf.org ;BRUNGARD,DEBORAH A ;Toerless Eckert ;Lou Berger ;bier-chairs@ietf.org ; > ??? ??? ???2020???02???29??? 00:00 > ??? ??? ???Re: [Bier] Pls "vote" on name (draft-ietf-bier-te-arch) > > > > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier > > > My vote: BIER-TE Call it Tree Engineering. If we were so concerned with acronym overuse the IETF would grind to a halt... I've been involved in other WGs where I felt the name missed the mark describing the ideas in the draft, but felt reading the draft was how someone got their heads around the proposed solution, rather than miss-read the title and run away confused. ie - Vlex-Algo. No, it's Flex-Topo, but what's to be gained from arguing for a name at this point? > > > Yes, we should strive to be as 'correct' as possible. But the IETF is full of baggage that engineers have managed to wade through, make sense of, and implement successfully. Get the spec right, No #1 priority. If you don't like the name, read on. It will grow on you. :) > > > Shep (w/o chair hat) > > > > > On Fri, Feb 28, 2020 at 7:31 AM Acee Lindem (acee) wrote: > > If you go with PBR, you could continue the BIER WG traditional of selecting brew-based acronyms. Hence, that would be my vote. It could be confused with Policy Based Routing but only if someone actually implements it. > Thanks, > Acee > > ???On 2/28/20, 9:23 AM, "BIER on behalf of Toerless Eckert" wrote: > > Sure, Just reply wth the ones you like whether existing or added and > give them the weiht you like, e.g.: from your email something like: > > 5 BIER-PBR (Path Based Routing) > 5 BIER-PST (Path based STeering) > 3 BIER-PE (Path Engineering) > > On Fri, Feb 28, 2020 at 07:54:07AM +0000, Dirk Trossen wrote: > > Toerless, all, > > > > May I add to the mix (which might not help) with the proposal for 'path-based routing' (or BIER-PBR) or 'path-based steering' (or BIER-PST)? If you want to keep a two letter acronym, I'd add 'path steering' (rather than path engineering) to the mix. From the below, without considering any alternatives, I'd go for BIER-PE but it comes with the issues like many two letter acronyms, namely the higher 'collision rate' with others. > > > > Best, > > > > Dirk > > > > > > > > -----Original Message----- > > From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Toerless Eckert > > Sent: 27 February 2020 21:41 > > To: bier@ietf.org > > Cc: Lou Berger ; bier-ads@ietf.org; BRUNGARD, DEBORAH A ; bier-chairs@ietf.org > > Subject: [Bier] Pls "vote" on name (draft-ietf-bier-te-arch) > > > > Dear WG > > > > Please chime in with opinions about the following or any new name you like as the new name for BIER-TE. Timeout is deadline for submission of draft before IETF107, when i'll post an update. If you propose a new name try to avoid re-using abbreviations that may be misinterpreted. > > > > 5 = best name ever, ... 1 = lame name, no number assigned means 0 votes are just added up and maximum sum option wins. > > Explanations if you haven't followed thread at the end. > > > > BIER-PE - Path Engineering > > BIER-ET - Explicit Trees > > BIER-EET - Explicit Engineered Trees > > BIER-BET - Bit Engineered Trees > > BIER-BST - Bit Steered Trees > > BIER-TrE - Tree engineering > > BIER-ET - Engineered Trees > > BIER-ST - Steered Trees > > > > BIER-ASB - Adjacency Steering Bits (adjacencies are how bits in BIER-PE are defined) > > BIER-AB - Adjacency Bits > > BIER-SB - Steering Bits (overloads with "Source Block" - never heard) > > > > Thanks, > > Toerless > > > > Explanations: If you have read through the threads with Lou and Deborah, and my understanding is correct: > > > > Lou desired there to be a new name so BIER-TE the forwarding/steering mechanism (this document) is named differently from BIER-TE the larger framework utilizing TEAS/PCE definition (separate future draft). > > > > Lou did not like my "Path Engineering" proposal as the name in the last version of the doc and felt we should pick a name with Steering/routing-policy in it. I think usn only steering/routing would be misleading (confused with unicast approaches). > > > > Deborah pointed to avoiding confusions in the name with pre-established named (e.g.: "PE" meaning Provider Edge). > > Said we should finalize on the name before we as the WG should pass the document to IESG. And she asked chairs to extend last-call by one more week (unrelated). Hence timeout end of next week. > > > > _______________________________________________ > > BIER mailing list > > BIER@ietf.org > > https://www.ietf.org/mailman/listinfo/bier > > > > _______________________________________________ > > BIER mailing list > > BIER@ietf.org > > https://www.ietf.org/mailman/listinfo/bier > > -- > --- > tte@cs.fau...de > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier -- --- tte@cs.fau.de From nobody Wed Mar 11 15:51:18 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B547B3A09A3; Wed, 11 Mar 2020 15:51:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.65 X-Spam-Level: X-Spam-Status: No, score=-1.65 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5gVWaIQJPpe6; Wed, 11 Mar 2020 15:51:08 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EE2293A09C4; Wed, 11 Mar 2020 15:51:07 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [131.188.34.52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id EF37F54804A; Wed, 11 Mar 2020 23:51:02 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id E8CD9440040; Wed, 11 Mar 2020 23:51:02 +0100 (CET) Date: Wed, 11 Mar 2020 23:51:02 +0100 From: Toerless Eckert To: iana@iana.org, bier-chairs@ietf.org, bier-ads@ietf.org Cc: bier@ietf.org Message-ID: <20200311225102.GB2331@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: [Bier] Ethertype for non-MPLS BIER suggestion X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 11 Mar 2020 22:51:15 -0000 Dear IANA, BIER leadership Not sure what normal IANA procedures are (or for that matter IEEE procedures), but: I would appreciate if there was an attempt made to update the following record with IEEE: http://standards-oui.ieee.org/ethertype/eth.txt AB37 IETF Routing Area Please read draft-ietf-bier-mpls-encapsulation-12 at 5177 Brandin Court https://datatracker.ietf.org/doc/draft-ietf-bier-mpls-encapsulation/. Fremont CA 94538 US Aka: Ask IEEE to change explanatory text to rfc8296 And for that matter, maybe IANA could check the other 7 entries of "draft-ietf" in that registry, and get them updated accordingly. Cheers Toerless P.S.: Great to see Routing Area has a physical mailbox address at the LLC. Is that the right way to send snail mail to our AD's ? (don't answer, just kidding). From nobody Wed Mar 11 16:42:40 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9DE6D3A0B79 for ; Wed, 11 Mar 2020 16:42:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.362 X-Spam-Level: X-Spam-Status: No, score=-3.362 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_MSPIKE_H2=-1.463, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (768-bit key) header.d=labn.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jfcG_g7lUG1e for ; Wed, 11 Mar 2020 16:42:38 -0700 (PDT) Received: from gproxy10-pub.mail.unifiedlayer.com (gproxy10-pub.mail.unifiedlayer.com [69.89.20.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 955B23A0BF2 for ; Wed, 11 Mar 2020 16:42:37 -0700 (PDT) Received: from cmgw15.unifiedlayer.com (unknown [10.9.0.15]) by gproxy10.mail.unifiedlayer.com (Postfix) with ESMTP id 430BF1404CE for ; Wed, 11 Mar 2020 17:42:36 -0600 (MDT) Received: from box313.bluehost.com ([69.89.31.113]) by cmsmtp with ESMTP id CAzkjaXPQxRFmCAzkjz8R7; Wed, 11 Mar 2020 17:42:36 -0600 X-Authority-Reason: nr=8 X-Authority-Analysis: v=2.3 cv=Dc05VMlW c=1 sm=1 tr=0 a=h1BC+oY+fLhyFmnTBx92Jg==:117 a=h1BC+oY+fLhyFmnTBx92Jg==:17 a=dLZJa+xiwSxG16/P+YVxDGlgEgI=:19 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=xqWC_Br6kY4A:10:nop_ipv6 a=IkcTkHD0fZMA:10:nop_charset_1 a=SS2py6AdgQ4A:10:nop_rcvd_month_year a=Vy_oeq2dmq0A:10:endurance_base64_authed_username_1 a=SU5WHZK0-rQ8oav4HukA:9 a=QEXdDO2ut3YA:10:nop_charset_2 a=pHzHmUro8NiASowvMSCR:22 a=nt3jZW36AmriUCFCBwmW:22 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=labn.net; s=default; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:MIME-Version :Date:Message-ID:From:References:Cc:To:Subject:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=tImRphgvw9/h4KJde6wvNatRphVgeDBGLRMQHTzOpoI=; b=mix78DEuFaCrHZOUtyjRydguRc dog0UO/5cOHlcRN+KC8n/k3OXPUXx2vEeEtpQdcAewkxPFOPJd67wga3wsX/+RvTbaPYHsRMo486/ Z8x44HbxEXBZ57ts3gJ+oB9Kj; Received: from [127.0.0.1] (port=39623 helo=[IPv6:::1]) by box313.bluehost.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.92) (envelope-from ) id 1jCAzj-000tVj-Ux; Wed, 11 Mar 2020 17:42:36 -0600 To: bier@ietf.org Cc: draft-ietf-bier-te-arch.ad@ietf.org References: <20200311221257.GA2331@faui48f.informatik.uni-erlangen.de> From: Lou Berger Message-ID: <44e81602-21fe-5efe-7ea1-d76345a1fcff@labn.net> Date: Wed, 11 Mar 2020 19:42:31 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 MIME-Version: 1.0 In-Reply-To: <20200311221257.GA2331@faui48f.informatik.uni-erlangen.de> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - box313.bluehost.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - labn.net X-BWhitelist: no X-Source-IP: 127.0.0.1 X-Source-L: Yes X-Exim-ID: 1jCAzj-000tVj-Ux X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: ([IPv6:::1]) [127.0.0.1]:39623 X-Source-Auth: lberger@labn.net X-Email-Count: 1 X-Source-Cap: bGFibm1vYmk7bGFibm1vYmk7Ym94MzEzLmJsdWVob3N0LmNvbQ== X-Local-Domain: yes Archived-At: Subject: Re: [Bier] BIER-TE -07 uploaded (was: Re: Pls "vote" on name (draft-ietf-bier-te-arch)) X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 11 Mar 2020 23:42:40 -0000 On 3/11/2020 6:12 PM, Toerless Eckert wrote: > I had hoped to receive a followup from Lou re. his suggestion for > additional text about "Traffic Engineering". Sorry I didn't see any message seriously asking for input into the document, public or private or otherwise.  As I stated previously, I'm happy to provide such. I'll try to produce it over the weekend, but it may be into next week.  Things are a bit busy for the moment -- I haven't even been able to keep up on the IETF list entertainment! Lou From nobody Wed Mar 11 18:05:29 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DDF3D3A0F3C; Wed, 11 Mar 2020 18:05:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.87 X-Spam-Level: X-Spam-Status: No, score=-0.87 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uC5cmFXwT9Cg; Wed, 11 Mar 2020 18:05:25 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CC4163A0F37; Wed, 11 Mar 2020 18:04:37 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id A61EA54804A; Thu, 12 Mar 2020 02:04:31 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id 97753440040; Thu, 12 Mar 2020 02:04:31 +0100 (CET) Date: Thu, 12 Mar 2020 02:04:31 +0100 From: Toerless Eckert To: Lou Berger Cc: bier@ietf.org, draft-ietf-bier-te-arch.ad@ietf.org Message-ID: <20200312010431.GC2331@faui48f.informatik.uni-erlangen.de> References: <20200311221257.GA2331@faui48f.informatik.uni-erlangen.de> <44e81602-21fe-5efe-7ea1-d76345a1fcff@labn.net> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <44e81602-21fe-5efe-7ea1-d76345a1fcff@labn.net> User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] BIER-TE -07 uploaded (was: Re: Pls "vote" on name (draft-ietf-bier-te-arch)) X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 01:05:27 -0000 On Wed, Mar 11, 2020 at 07:42:31PM -0400, Lou Berger wrote: > > On 3/11/2020 6:12 PM, Toerless Eckert wrote: > > I had hoped to receive a followup from Lou re. his suggestion for > > additional text about "Traffic Engineering". > > Sorry I didn't see any message seriously asking for input into the document, > public or private or otherwise.  https://mailarchive.ietf.org/arch/msg/bier/5SMrtPDgBo861DVf4ZcstXL1b78/ https://mailarchive.ietf.org/arch/msg/bier/lNsrv3d28gHiOPSnVe9TpLUM_z4/ PM March 5th "Subject: Lou: Re: [Bier] Pls "vote" on name (draft-ietf-bier-te-arch)" > As I stated previously, I'm happy to > provide such. I'll try to produce it over the weekend, but it may be into > next week.  Things are a bit busy for the moment -- I haven't even been able > to keep up on the IETF list entertainment! As i said in my mails, i am completely unclear as to what you would want to write, and its not clear to me either why it better would go into this document than into the planned TEAS framework document. Would be happy to also have a quick voice call if you prefer that. Cheers Toerless From nobody Wed Mar 11 21:02:22 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E58003A0C57; Wed, 11 Mar 2020 21:02:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id F7K_onN9S-mc; Wed, 11 Mar 2020 21:02:18 -0700 (PDT) Received: from mail-il1-x12c.google.com (mail-il1-x12c.google.com [IPv6:2607:f8b0:4864:20::12c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3154D3A0C55; Wed, 11 Mar 2020 21:02:18 -0700 (PDT) Received: by mail-il1-x12c.google.com with SMTP id g6so4188729ilc.7; Wed, 11 Mar 2020 21:02:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=aAzTR0QqWZ/PmqdRs1AoxsJyagZRIIEoA30leGberzw=; b=eo4ktLn7Snl1OQLGIZ8JygXFaF82EV4D0JkNm6swXvGb5BEV4jLYQvBg+meyrzSduE 9hdCu5IIwuS/uNiaEPsV5b5tpbfkULtsIqCI/fjXqh4mRkU1MhPVMgKT8BjUJ9Kj0Fnh WqI4wB60aeijlmQYzZHIlGepNUSBDWlmosMXoC98zOnhymEyaZkqZAMy38hbsUkW1B55 BseUSV9Xcgr296SB3GJBQQpkmnpViKLrVhN9JDndPw5q2Rm7spUIhaX0ogQPMh97x670 Yw1+ijq9wA+BFI/GQVAibEUXrjZrQ1u/Uu6KvUVZjMKXWIVXBHtGDGV05reL0LJcQWSO tF3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=aAzTR0QqWZ/PmqdRs1AoxsJyagZRIIEoA30leGberzw=; b=C+en2KtdD2KLFztF8IGJrtXYGti8mTxL/74+J5ttPYCN9YnRon5zFyqKut5x6sxQMq 2CchcdED8/wx2BsGiwsbKpAiMmotz492WPX9Zks4GrQAJtD46IjBHwvLx5aW8vlmXb4a H1lp63/64m3g+uspSpZl8Twhd+xJ4nSiwFPsf3KCRWCGOwP6XYvjsnNhVqtGhOzLJG06 LcL85CtZERDwPMDsUH8ewxmb5BhlHteKHyceTzBPnZYlDdADqtSWcJMG5O1c6OHAI74Z y91vgFwIxS/5KwHsogEzCMRgVweP5rAkZZtmTz0Sj0ocJpyEVxIgjW/66IH7KN4rbOXQ AIbQ== X-Gm-Message-State: ANhLgQ26cfgkhuNEt2UaaM0kqxNGn6Rb6eQDAc6c2iL6k/Knskoi5zj/ dpvlI+4WKKwd0cWz4ckkcm50369f7NS8oZNMTJA= X-Google-Smtp-Source: ADFU+vsD83HaP5Wbp9E3IhX8ATCPrVvKNLVr/vh2q1P+kEk7Jwk8JciJSbRoPd/zwcycCJMbWCvIDkXUeaRFt66LzyM= X-Received: by 2002:a92:bad9:: with SMTP id t86mr4926013ill.156.1583985737231; Wed, 11 Mar 2020 21:02:17 -0700 (PDT) MIME-Version: 1.0 References: <20200311225102.GB2331@faui48f.informatik.uni-erlangen.de> In-Reply-To: <20200311225102.GB2331@faui48f.informatik.uni-erlangen.de> From: Tony Przygienda Date: Wed, 11 Mar 2020 21:00:44 -0700 Message-ID: To: Toerless Eckert Cc: iana@iana.org, BIER WG Chairs , bier-ads@ietf.org, BIER WG Content-Type: multipart/alternative; boundary="00000000000032713d05a0a06b98" Archived-At: Subject: Re: [Bier] Ethertype for non-MPLS BIER suggestion X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 04:02:20 -0000 --00000000000032713d05a0a06b98 Content-Type: text/plain; charset="UTF-8" I'm surprised, there was an official liaison and assignment from IEEE of the ethertype. Alia handled it while I remember having filed _the_ forms ;-) for her ... --- tony On Wed, Mar 11, 2020 at 3:51 PM Toerless Eckert wrote: > Dear IANA, BIER leadership > > Not sure what normal IANA procedures are (or for that matter IEEE > procedures), > but: > > I would appreciate if there was an attempt made to update the following > record with IEEE: > > http://standards-oui.ieee.org/ethertype/eth.txt > > > AB37 IETF Routing Area Please read > draft-ietf-bier-mpls-encapsulation-12 at > 5177 Brandin Court > https://datatracker.ietf.org/doc/draft-ietf-bier-mpls-encapsulation/. > > Fremont CA 94538 > US > > Aka: Ask IEEE to change explanatory text to rfc8296 > > And for that matter, maybe IANA could check the other 7 entries of > "draft-ietf" in that registry, and get them updated accordingly. > > Cheers > Toerless > > P.S.: Great to see Routing Area has a physical mailbox address at the > LLC. Is that the right way to send snail mail to our AD's ? (don't answer, > just kidding). > --00000000000032713d05a0a06b98 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I'm surprised, there was an official liaison and = assignment from IEEE of the ethertype. Alia handled it while I remember hav= ing filed _the_ forms ;-) for her ...

--- ton= y

On Wed, Mar 11, 2020 at 3:51 PM Toerless Eckert <tte@cs.fau.de> wrote:
Dear IANA, BIER leadership

Not sure what normal IANA procedures are (or for that matter IEEE procedure= s),
but:

I would appreciate if there was an attempt made to update the following rec= ord with IEEE:

http://standards-oui.ieee.org/ethertype/eth.txt

AB37=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 IETF Routing Area=C2=A0 =C2=A0Please read draft-ietf-b= ier-mpls-encapsulation-12 at
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 5177 Brandin Court=C2=A0 =C2=A0https://datatracker.ietf.org/doc/draft-ietf-= bier-mpls-encapsulation/.=C2=A0 =C2=A0 =C2=A0
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Fremont=C2=A0 CA=C2=A0 94538=C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 US=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0

Aka: Ask IEEE to change explanatory text to rfc8296

And for that matter, maybe IANA could check the other 7 entries of "dr= aft-ietf" in that registry, and get them updated accordingly.

Cheers
=C2=A0 =C2=A0 Toerless

P.S.: Great to see Routing Area has a physical mailbox address at the
LLC. Is that the right way to send snail mail to our AD's ? (don't = answer, just kidding).
--00000000000032713d05a0a06b98-- From nobody Wed Mar 11 21:03:15 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EC04D3A0C67; Wed, 11 Mar 2020 21:03:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zjh-twM5Jt_G; Wed, 11 Mar 2020 21:03:12 -0700 (PDT) Received: from mail-il1-x12b.google.com (mail-il1-x12b.google.com [IPv6:2607:f8b0:4864:20::12b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 46A003A0C65; Wed, 11 Mar 2020 21:03:12 -0700 (PDT) Received: by mail-il1-x12b.google.com with SMTP id f5so4186438ilq.5; Wed, 11 Mar 2020 21:03:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=UgiIgc/wLsKz+aw2vOvLXueYR5Ax1T2sZwEOYAPP99o=; b=lNc6AoFnt8NrnF4yMcvXG7TIfn7ApfCbu0u9MiG5uuljoARes8cfVAmdljC4wVbi2B XHOhpnmL5XqaO6IQF4E51euT/M0kOzvmkdwFmVK+mMhHohHeIvRgQnV74TbtFFWsytnP GWittMViq9JtoWFh31Qn+xtnM+JEx/85qsWqTVCtKHnMa/zmwE/Ir0Uee2ENXkNGyEO1 M6jDLPoFDxMxr436ePwovaFoLXpsKHFJ/DaLSS+reOOxTZGRBnqp8q9yBdkcWuKF5SfB IO/4C/RmeVRjdJHeL+KhzCHPVqJmeiC7k9dmyQHvmHTDATTie4cEymelQX1SMJ/nza7G mwew== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=UgiIgc/wLsKz+aw2vOvLXueYR5Ax1T2sZwEOYAPP99o=; b=s9znirhTvvdNY1Mmakij0gnsrpmK1RI77qNin6gZmNHLl4iBgaogiEUStrrmHeMD7J YFWG4EpRMtfDDnqP702+s2HZLtghUSzx8RV4LKLQtpXx9ESoL95DbwVuCMWb6F+96Ob3 sDvl6Br6LKYAZR0qIxtISlwFR/yF7edTXWVak9+ZQVqc8cLzVklMh7KZ/mBUwg/0mn8f UXaF0yf2tFomRnLATrIgB8Omr9zvagqdHbAPrrHgBTv5PfWNRrGYf79o6cvsvARqa6Ka Z6R/vXBc2SAmhgzBBfLmTBc+55TbFokX5buubEJGZj6hwI7Fv3gXBGOqrcdUBnbiee23 wbdw== X-Gm-Message-State: ANhLgQ23dXyVN0pGqUuAwf4sezFv+oCdoF8whSU9B9PXVOJOvvZAziJQ xNrFnSLJnRiAFXSjYc0cPVDiLdslqLk5Fs0Xl2o= X-Google-Smtp-Source: ADFU+vuDzf3r9H0+K8BsPMGENA+01TTCJYfD8LxF8teu6k4Tz2dbNIX6Z3cRv02czZmxqho1llVON7/Pjjb9gh/fc0U= X-Received: by 2002:a92:ce04:: with SMTP id b4mr466726ilo.269.1583985791549; Wed, 11 Mar 2020 21:03:11 -0700 (PDT) MIME-Version: 1.0 References: <20200311225102.GB2331@faui48f.informatik.uni-erlangen.de> In-Reply-To: From: Tony Przygienda Date: Wed, 11 Mar 2020 21:01:39 -0700 Message-ID: To: Toerless Eckert Cc: iana@iana.org, BIER WG Chairs , bier-ads@ietf.org, BIER WG Content-Type: multipart/alternative; boundary="0000000000006f45b905a0a06e1e" Archived-At: Subject: Re: [Bier] Ethertype for non-MPLS BIER suggestion X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 04:03:14 -0000 --0000000000006f45b905a0a06e1e Content-Type: text/plain; charset="UTF-8" oh, I see. no idea what the proper "update" procedure in IEEE is. Someone feels like ferreting that out? On Wed, Mar 11, 2020 at 9:00 PM Tony Przygienda wrote: > I'm surprised, there was an official liaison and assignment from IEEE of > the ethertype. Alia handled it while I remember having filed _the_ forms > ;-) for her ... > > --- tony > > On Wed, Mar 11, 2020 at 3:51 PM Toerless Eckert wrote: > >> Dear IANA, BIER leadership >> >> Not sure what normal IANA procedures are (or for that matter IEEE >> procedures), >> but: >> >> I would appreciate if there was an attempt made to update the following >> record with IEEE: >> >> http://standards-oui.ieee.org/ethertype/eth.txt >> >> >> AB37 IETF Routing Area Please read >> draft-ietf-bier-mpls-encapsulation-12 at >> 5177 Brandin Court >> https://datatracker.ietf.org/doc/draft-ietf-bier-mpls-encapsulation/. >> >> Fremont CA 94538 >> >> US >> >> Aka: Ask IEEE to change explanatory text to rfc8296 >> >> And for that matter, maybe IANA could check the other 7 entries of >> "draft-ietf" in that registry, and get them updated accordingly. >> >> Cheers >> Toerless >> >> P.S.: Great to see Routing Area has a physical mailbox address at the >> LLC. Is that the right way to send snail mail to our AD's ? (don't >> answer, just kidding). >> > --0000000000006f45b905a0a06e1e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
oh, I see. no idea what the proper "update"= procedure in IEEE is. Someone feels like ferreting that out?


On Wed, Mar 11, 2020 at 9:00 PM Tony Przygienda <tonysietf@gmail.com> wrote:
I'= m surprised, there was an official liaison and assignment from IEEE of the = ethertype. Alia handled it while I remember having filed _the_ forms ;-) fo= r her ...

--- tony

On Wed, Mar 11, = 2020 at 3:51 PM Toerless Eckert <tte@cs.fau.de> wrote:
Dear IANA, BIER leadership

Not sure what normal IANA procedures are (or for that matter IEEE procedure= s),
but:

I would appreciate if there was an attempt made to update the following rec= ord with IEEE:

http://standards-oui.ieee.org/ethertype/eth.txt

AB37=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 IETF Routing Area=C2=A0 =C2=A0Please read draft-ietf-b= ier-mpls-encapsulation-12 at
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 5177 Brandin Court=C2=A0 =C2=A0https://datatracker.ietf.org/doc/draft-ietf-= bier-mpls-encapsulation/.=C2=A0 =C2=A0 =C2=A0
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Fremont=C2=A0 CA=C2=A0 94538=C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 US=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0

Aka: Ask IEEE to change explanatory text to rfc8296

And for that matter, maybe IANA could check the other 7 entries of "dr= aft-ietf" in that registry, and get them updated accordingly.

Cheers
=C2=A0 =C2=A0 Toerless

P.S.: Great to see Routing Area has a physical mailbox address at the
LLC. Is that the right way to send snail mail to our AD's ? (don't = answer, just kidding).
--0000000000006f45b905a0a06e1e-- From nobody Wed Mar 11 21:04:24 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 493A93A0C6A for ; Wed, 11 Mar 2020 21:04:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BFnkNIhNlny1 for ; Wed, 11 Mar 2020 21:04:21 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D06F83A0C68 for ; Wed, 11 Mar 2020 21:04:20 -0700 (PDT) Received: from LHREML710-CAH.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id AEEE34AC7E143C0E7898; Thu, 12 Mar 2020 04:04:17 +0000 (GMT) Received: from nkgeml704-chm.china.huawei.com (10.98.57.158) by LHREML710-CAH.china.huawei.com (10.201.108.33) with Microsoft SMTP Server (TLS) id 14.3.408.0; Thu, 12 Mar 2020 04:04:17 +0000 Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by nkgeml704-chm.china.huawei.com (10.98.57.158) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Thu, 12 Mar 2020 12:04:14 +0800 Received: from nkgeml705-chm.china.huawei.com ([10.98.57.154]) by nkgeml705-chm.china.huawei.com ([10.98.57.154]) with mapi id 15.01.1713.004; Thu, 12 Mar 2020 12:04:14 +0800 From: "Xiejingrong (Jingrong)" To: "gjshep@gmail.com" CC: "bier@ietf.org" , Toerless Eckert Thread-Topic: [Bier] WGLC - draft-ietf-bier-te-arch 1 WEEK Thread-Index: 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L2JvZHk+DQo8L2h0bWw+DQo= --_000_87f9ff060e20406a9ee2ffd70cfa02e0huaweicom_-- From nobody Wed Mar 11 21:23:54 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 601B73A0D27 for ; Wed, 11 Mar 2020 21:23:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.87 X-Spam-Level: X-Spam-Status: No, score=-0.87 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id slSt9ITev2bT for ; Wed, 11 Mar 2020 21:23:47 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 388BA3A0D2F for ; Wed, 11 Mar 2020 21:23:46 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [131.188.34.52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 02564548049 for ; Thu, 12 Mar 2020 05:23:40 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id E8461440040; Thu, 12 Mar 2020 05:23:40 +0100 (CET) Date: Thu, 12 Mar 2020 05:23:40 +0100 From: Toerless Eckert To: bier@ietf.org Message-ID: <20200312042340.GA11877@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: [Bier] comments for draft-xie-bier-ipv6-encapsulation-05.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 04:23:52 -0000 Comments on subject document inline. Thanks a lot for the work. > > > > > Network Working Group J. Xie > Internet-Draft Huawei Technologies > Intended status: Standards Track L. Geng > Expires: July 17, 2020 China Mobile > M. McBride > Futurewei > R. Asati > Cisco > S. Dhanaraj > Huawei > January 14, 2020 > > > Encapsulation for BIER in Non-MPLS IPv6 Networks > draft-xie-bier-ipv6-encapsulation-05 > > Abstract > > This document proposes a BIER IPv6 (BIERv6) encapsulation for Non- > MPLS IPv6 Networks using the IPv6 Destination Option extension > header. This document updates [RFC8296]. > > Requirements Language > > The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", > "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this > document are to be interpreted as described in [RFC2119] and > [RFC8174]. > > Status of This Memo > > This Internet-Draft is submitted in full conformance with the > provisions of BCP 78 and BCP 79. > > Internet-Drafts are working documents of the Internet Engineering > Task Force (IETF). Note that other groups may also distribute > working documents as Internet-Drafts. The list of current Internet- > Drafts is at https://datatracker.ietf.org/drafts/current/. > > Internet-Drafts are draft documents valid for a maximum of six months > and may be updated, replaced, or obsoleted by other documents at any > time. It is inappropriate to use Internet-Drafts as reference > material or to cite them other than as "work in progress." > > This Internet-Draft will expire on July 17, 2020. > > > > > > > Xie, et al. Expires July 17, 2020 [Page 1] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > Copyright Notice > > Copyright (c) 2020 IETF Trust and the persons identified as the > document authors. All rights reserved. > > This document is subject to BCP 78 and the IETF Trust's Legal > Provisions Relating to IETF Documents > (https://trustee.ietf.org/license-info) in effect on the date of > publication of this document. Please review these documents > carefully, as they describe your rights and restrictions with respect > to this document. Code Components extracted from this document must > include Simplified BSD License text as described in Section 4.e of > the Trust Legal Provisions and are provided without warranty as > described in the Simplified BSD License. > > Table of Contents > > 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 > 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 > 3. BIER IPv6 Encapsulation . . . . . . . . . . . . . . . . . . . 3 > 3.1. BIER Option in IPv6 Destination Options Header . . . . . 3 > 3.2. Multicast and Unicast Destination Address . . . . . . . . 6 > 3.3. BIERv6 Packet Format . . . . . . . . . . . . . . . . . . 8 > 4. BIERv6 Packet Processing . . . . . . . . . . . . . . . . . . 9 > 5. Security Considerations . . . . . . . . . . . . . . . . . . . 11 > 5.1. Intra Domain Deployment . . . . . . . . . . . . . . . . . 12 > 5.2. Inter Domain Deployment . . . . . . . . . . . . . . . . . 13 > 5.3. ICMP Error Processing . . . . . . . . . . . . . . . . . . 13 > 5.4. Security caused by BIER option . . . . . . . . . . . . . 14 > 5.5. Applicability of IPsec . . . . . . . . . . . . . . . . . 14 > 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15 > 6.1. BIER Option Type . . . . . . . . . . . . . . . . . . . . 15 > 6.2. End.BIER Function . . . . . . . . . . . . . . . . . . . . 15 > 6.3. BIER Next Protocol Identifiers . . . . . . . . . . . . . 16 > 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 16 > 8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 16 > 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 17 > 9.1. Normative References . . . . . . . . . . . . . . . . . . 17 > 9.2. Informative References . . . . . . . . . . . . . . . . . 18 > Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 18 > > 1. Introduction > > Bit Index Explicit Replication (BIER) [RFC8279] is an architecture > that provides optimal multicast forwarding without requiring > intermediate routers to maintain any per-flow state by using a > multicast-specific BIER header. > > > > > Xie, et al. Expires July 17, 2020 [Page 2] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > [RFC8296] defines a common BIER Header format for MPLS and Non-MPLS > networks. It has defined two types of encapsulation methods using > the common BIER Header, (1) BIER encapsulation in MPLS networks, > here-in after referred as MPLS BIER Header in this document and (2) > BIER encapsulation in Non-MPLS networks, here-in after referred as > Non-MPLS BIER Header in this document. [RFC8296] also assigned > Ethertype=0xAB37 for Non-MPLS BIER Header packets to be directly > carried over the Ethernet links. > > This document proposes a BIER IPv6 encapsulation for Non-MPLS IPv6 > Networks, defining a method to carry the standard Non-MPLS BIER > header (as defined in [RFC8296]) in the native IPv6 header. A new > IPv6 Option type - BIER Option is defined to encode the standard Non- > MPLS BIER header and this newly defined BIER Option is carried under > the Destination Options header of the native IPv6 Header [RFC8200]. > > This document details one of the proposed solutions for transporting > BIER packets in an IPv6 network. To better understand the overall > BIER IPv6 problem space, use cases and proposed solutions, refer to > [I-D.ietf-bier-ipv6-requirements]. > > 2. Terminology > > Readers of this document are assumed to be familiar with the > terminology and concepts of the documents listed as Normative > References. > > The following new terms are used throughout this document: > > o BIERv6 - BIER IPv6. > > o BIER Option - An Option type carried in IPv6 Destination Options > Header which includes the standard Non-MPLS BIER Header. > > o BIERv6 Header - An IPv6 Header with BIER Option. > > o BIERv6 Packet - An IPv6 packet with BIERv6 Header. Such an IPv6 > packet typically carries the user multicast payload and is > forwarded by BFRs in the BIERv6 network towards the multicast > receivers. > > 3. BIER IPv6 Encapsulation I think it would be good to write introductory text here explaining the overall approach of this encapsulation, e.g: BFIR running this option encapsulate the target IP multicast payload (IPv6, IPv6, ethernet packet) into a BIERv6 packet, which is an IPv6 packet with the new BIERv6 header. This packet is then hop-by-hop IPv6 forwarded with the BIER replication semantic defined by the BIERv6 header and decapsulated on the BFERs. > > 3.1. BIER Option in IPv6 Destination Options Header > > Destination Options Header and the Options that can be carried under > this extension header is defined in [RFC8200]. This document defines > a new Option type - BIER Option, to encode the Non-MPLS BIER header. > > > > Xie, et al. Expires July 17, 2020 [Page 3] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > As specified in Section 4.2 [RFC8200], the BIER Option follows type- > length-value (TLV) encoding format and the standard Non-MPLS BIER > header [RFC8296] is encoded in the value portion of the BIER Option > TLV. > > This BIER Option MUST be carried only inside the IPv6 Destination > Options header and MUST NOT be carried under the Hop-by-Hop Options > header. > > Co-existence of Destination Options Header with BIER option TLV and > other IPv6 extension headers MUST confirm to the general requirements > defined in [RFC8200]. In addition to the requirements defined in > [RFC8200], this document requires that the Destination Options Header > with a BIER Option TLV MUST appear only after the Routing Header if > the Routing Header is present in the IPv6 Header. > > The BIER Option is encoded in type-length-value (TLV) format as > follows: > > 0 1 2 3 > 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > | Next Header | Hdr Ext Len | Option Type | Option Length | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > | | > ~ Non-MPLS BIER Header (defined in RFC8296) ~ > | | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > Next Header 8-bit selector. Identifies the type of header > immediately following the Destination Options header. > > Hdr Ext Len 8-bit unsigned integer. Length of the Destination > Options header in 8-octet units, not including the first 8 octets. > > Option Type To be allocated by IANA. See section 6. > > Option Length 8-bit unsigned integer. Length of the option, in > octets, excluding the Option Type and Option Length fields. > > Non-MPLS BIER Header The Non-MPLS BIER Header defined in RFC8296. > Fields in the Non-MPLS BIER Header MUST be encoded as below. > > > > BIFT-id: The BIFT-id is a domain-wide unique value in Non-MPLS > IPv6 encapsulation. See Section 2.2 of RFC 8296. > > > > > Xie, et al. Expires July 17, 2020 [Page 4] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > TC: SHOULD be set to binary value 000 upon transmission and MUST > be ignored upon. See Section 2.2 of RFC 8296. > > S bit: SHOULD be set to 1 upon transmission, and MUST be ignored > upon reception. See Section 2.2 of RFC 8296. > > TTL: MUST be set to a value larger than 0 upon encapsulation, > and SHOULD decrease by 1 by a BFR when forwarding a BIERv6 > packet to a BFR adjacency. If the incoming TTL is 0, the packet > is considered to be "expired". See Section 2.1.1.2 of RFC 8296. > > Nibble: SHOULD be set to 0000 upon transmission, and MUST be > ignored upon reception. See Section 2.2 of RFC 8296. > > Ver: MUST be set to 0 upon transmission, and MUST be discarded > when it is not 0 upon reception. See Section 2.2 of RFC 8296. > > BSL: See Section 2.1.2 of RFC 8296. > > Entropy: See Section 2.1.2 of RFC 8296. > > OAM: See Section 2.1.2 of RFC 8296. > > Rsv: See Section 2.1.2 of RFC 8296. Is there anything up to here that is different from what RFC8296 for non-MPLS networks ? If there are new things here, they are hard to identify, so it might be better to eliminate all requirments that can be found in RFC8296 2.2 and only describe any changes. > DSCP: SHOULD be set to binary value 000000 upon transmission and > MUST be ignored upon reception. In IPv6 BIER encapsulation, > uses highest 6-bit of Traffic Class field of IPv6 header to hold > a Differentiated Services Codepoint [RFC2474]. Given how this draft suggests to verbatim reuse the quite long RFC8296 forwarding header (like other proposals for BIER with IPv6 too), i think the hope is that it can leverage as much as possible existing BIER forwarding logic to ease adoption. It is therefore not clear to me if it is prudent to force the forwarding plane to use the DSCP from the IPv6 header instead of the BIER header. I would suggest to say that the BFIR uses the same DSCP for both the IPv6 and BIER header so that forwarding plane can use either field, which ever is easier to impleemnt. Else, it would be good o have an explanation in the text why the above described approach is superior. > Proto: This fileld is used for two functions. The first is to > identify the BIER Payload following the BIER header, and the > second is to deliver the packet to a proper overlay module by > BIER layer, with VRF lookup in case of BIER data process, or > without VRF lookup in case of BIER OAM process. In BIER IPv6 > encapsulation, the first function of Proto is compromised by a > proper Next Header value combination, and the second function of > Proto should be kept with the semantic unique and consistent for > BIER demultiplexing. This updates section 2.1.2 of [RFC8296] > about Proto defination. This document support the following > combination of BIER Proto and Next Header: > > > > Use Next Header value 4, 41 and TBD0 for IPv4 packet, IPv6 > packet and Ethernet packet respectively, In general, this document might not constrain itself to specific code points but just allow all the code-points that users want and are defined by IANA. IPv4 and IPv6 of course can be explicitly listed maybe even with requirements levels. Rewrite text for TBD0 to instead say "code point for ethernet from ", so this doc wouldn't need to wait for it. > and use Proto value > TBD1 indicating "Delivering the data packet with VRF lookup > in IPv6 source address". I am right now not on top of how BIER in MPLS networks supports the more complex forms of VRFs, e.g.: extranet VRFs, but i thought it was through additional labels after the BIER header. Logically a BFIR might only have one address in VRF0, so it could be problematic to expect for BIER to assume per-VRF addresses as source addresses. Maybe it would be easier to move the VRF support into a separate document. Seems to me as if it would make sense to figure out if BIER with v6 could be combined with some subset of SRv6 that includes the destination (BFER) related SIDs, most of which seem to be about VRF selection. That would make inclusion of BIER into SRv6 deployment easier. And i am guessing that customers who insist on hop-by-hop IPv6 forwarding across their core would likely minimize differences to SRv6 too. > > > > Xie, et al. Expires July 17, 2020 [Page 5] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > Use Next Header value 59 for private packet format, and use > Proto value 5 indicating "Delivering the BIER OAM packet > without VRF lookup". The BIER-PING [I-D.ietf-bier-ping] > works equally in BIER IPv6 encapsulation as well as in BIER > MPLS or BIER Ethernet encapsulation. > > Allocation of Next Header value TBD0 for Ethernet packet is > applying in [I-D.ietf-spring-srv6-network-programming] and > will not be listed in the IANA considerations section of this > document. With above change referring only to that doc, not he actual code-point, this paragraph could go away. Of course, once the code point is IANA assigned, you can simply use it in the text and remove the reference. > Allocation of BIER Proto value TBD1 is listed in the IANA > considerations section of this document. > > BFIR-id: See Section 2.1.2 of RFC 8296. > > BitString: See Section 2.1.2 of RFC 8296. > > 3.2. Multicast and Unicast Destination Address > > BIER is generally a hop-by-hop and one-to-many architecture, and thus > the IPv6 Destination Address (DA) being a Multicast Address is a way > one may think of as an approach for both the two paradigms in BIERv6 > encapsulation. I think a better way to explain: If an IPv6 (or IPv4) multicast group destination address is used as a hop-by-hop forwarding key, then this requires hop-by-hop per-group forwarding state, therefore, just because BIER is like IP multicast a (multi-)point-to-multipoint service, it can not use IP multicast IP multicast group destination addresses. Instead it requires per-hop unicast destination address forwarding. > However using a unicast address has the following benefits: > > 1. Tunneling a BIERv6 packet over a non-BIER capable router. > > 2. Fast rerouting a BIERv6 packet using a unicast by-pass tunnel. Maybe more general "Using unicast FRR adjacencies to next-hop BFR". > 3. Forwarding a BIERv6 packet to one of the many BFR neighbors > connected on a LAN. Well. AFAIK, all the BIER solutions as well as mLDP/RSVP-TE have rather the downside that they must create multiple copies across the same LAN as they have neighbors to send to, so this is not only a benefit. (Maybe mLDP does now standardize native link-local multicast with upstream assigned labels to leverage L2 multicast, not sure). > 4. Connecting BIER domains, for example Data Center domains, in an > overlay manner. Given the management considerations for the BIER addressing space, this is a bit like saying the telephone allows people in different countries to talk with each other. Aka: Higher layer problems non-withstanding. IMHO, no need to create contention around point 3 and 4, its just a reqiurements and it comes with undeniable benefits 1. and 2. > Some of the above functions are assumed very basic requirements and > part of BIER architecture as described in [RFC8279]. This document > uses unicast address for both one-hop replication and multi-hop > replication. Not sure if one-hop replication and multi-hop replication are well predefined terms maybe better "BIER replication to subnet adjacent BFR and BIER replication to remote BFR". > > The unicast address used in BIERv6 packet targeting a BFR SHOULD be > advertised as part of the BIER IPv6 Encapsulation. When a BFR > advertises the BIER information with BIERv6 encapsulation capability, > an IPv6 unicast address of this BFR MUST be selected specifically for > BIERv6 packet forwarding. Locally this "BIER Specific" IPv6 address > > > > > Xie, et al. Expires July 17, 2020 [Page 6] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > is initialized in FIB with a flag of "BIER specific handling", > represented as End.BIER function. You should start explaining here, before you use the SR terminology (foo.bar), that the semantic of the encapsulation addresses is explained in SR terminology becuase it is desired for BIERv6 to be used inside an SRv6 network and share its terminology. Right now you do it after using all the SR terminology and pseudo code, which may ten confuse non-SRv6 aware readers. > If a BFR belongs to more than one sub-domain, it may (though it need > not) have a different End.BIER in each sub-domain. If different > End.BIER is used for each sub-domain, implementation SHOULD support > verifying the DA of a BIERv6 packet is the End.BIER address bound by > the sub-domain of the packet. See section 5.2 for such use case. > > The following is an example of configuring a sub-domain using BIER > IPv6 encapsualation: > > # Config an IPv6 block for End.BIER IPv6 address allocation > ipv6-block blk1 2001:DB8:A1:: 96 static 32 > > # Config BIER Sub-domain using End.BIER allocated from blk1 > bier sub-domain 6 ipv6-underlay > bfr-prefix interface loopback0 > end-bier ipv6-block blk1 opcode ::1 > encapsulation ipv6 bsl 256 max-si 0 > > The co-existance of BIERv6 and SRv6 is allowed. The following is an > example of configuring a sub-domain using BIERv6 when SRv6 is already > deployed with a locator 'loc1' configured: > > # Config BIER Sub-domain using End.BIER allocated from loc1 > bier sub-domain 6 ipv6-underlay > bfr-prefix interface loopback0 > end-bier locator loc1 opcode ::1 > encapsulation ipv6 bsl 256 max-si 0 > > For the convenience of such co-existence of BIERv6 and SRv6, the > indication of End.BIER or "BIER specific handling" in FIB shares the > same space as SRv6 Endpoints Behaviors defined in > [I-D.ietf-spring-srv6-network-programming]. Apart from this sharing > of code space, there is nothing dependent on SRv6. > > The following is an example pseudo-code of the End.BIER function: > > > > > > > > > > > > > > Xie, et al. Expires July 17, 2020 [Page 7] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > 1. IF NH = 60 and HopLimit > 0 ;;Ref1 > 2. IF (OptType1 = BIER) and (OptLength1 = HdrExtLen*8 + 4) ;;Ref2 > 3. Lookup the BIER Header inside the BIER option TLV. > 4. Forward via the matched entry. > 5. ELSE ;;Ref3 > 6. Drop the packet and end the process. > 7. ELSE IF NH=ICMPv6 or (NH=60 and Dest_NH=ICMPv6) ;;Ref4 > 8. Send to CPU. > 9. ELSE ;;Ref5 > 10. Drop the packet. > > Ref1: Destination options header follows the IPv6 header directly and > HopLimit is bigger than zero. > > Ref2: The first TLV is BIER type and is the only TLV present in > Destination options header. > > Ref3/Ref5: Undesired packet is droped because the destination address > is the BIER specific IPv6 address (End.BIER function). > > Ref4: An ICMPv6 packet using End.BIER as destination address. I didn't try yet to understand all this text, and so might other non-SR knowledgable readers, so i recommend to add a summary at the end that tries to explain non-SR terms what specifically this example was doing. > > 3.3. BIERv6 Packet Format > > As a multicast packet enters the BIER domain in a Non-MPLS IPv6 > network, the multicast packet will be encapsulated with BIERv6 > Header. > > Typically a BIERv6 header would contain the Destination Options > Header as the only Extensions Header besides IPv6 Header. However, > it is allowed and possible for other extension headers to appear > along with the Destination Options Header as long as the requirements > listed in section 3.1 of this document is met. > > Format of the multicast packet with BIERv6 encapsulation carrying > only the Destination Options header is depicted in the below figure. > > +---------------+--------------+------------ > | IPv6 header | Dest Options | X type of > | | Header with | multicast > | | BIER Option | packet > | | | > | Next Hdr = 60 | Nxt Hdr = X | > +---------------+--------------+------------ Would be nice to include in dotted (optional) form the routing header. > Format of the multicast packet with BIERv6 encapsulation carrying > other extension headers along with Destination Options extension > header is required to follow general recommendations of [RFC8200] and > > > > Xie, et al. Expires July 17, 2020 [Page 8] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > examples in other RFCs. [RFC6275] introduces how the order should be > when other extension headers carries along with Home address option > in a destination options header. Similar to this example, this > document requires the Destination Options Header carrying the BIER > option MUST be placed as follows: > > o After the routing header, if that header is present > > o Before the Fragment Header, if that header is present > > o Before the AH Header or ESP Header, if either one of those headers > is present > > Source Address field in the IPv6 header MUST be a routable IPv6 > unicast address of the BFIR in any case. Is it permitted by RFC8200 to lie about the source address when you are a node operating on a destination option ? I don't know because i am not an ordained priest of the church of RFC8200. I understand you are allowed to keep the source address unchanged (and declare that not to be a lie) when you rewrite the destination address as part of being addressed by a routing header option, but i thought even in SRv6 when you do something like a binding-SID you would have to rewrite the source address. > > BFIR encodes the Non-MPLS BIER header in the above mentioned > encapsulation format and forwards the BIERv6 packet to the nexthop > BFR following the local BIFT table. LCD Display ;-) (Table is the last word in BIFT, no need to replicate). > BFRs in the IPv6 network, processes and replicates the packets > towards the BFERs using the local BIFT table. The bit-string field > in the Non-MPLS BIER header may be changed by the BFRs as they > replicate the packet. BFRs MUST follow the procedures defined in > section 3.1 as they modify the other fields in the Non-MPLS BIER > header. The source address in the IPv6 header MUST NOT be modified > by the BFRs. > > 4. BIERv6 Packet Processing > > There is no BIER-specific processing, ? Unclear. > and all the 8 steps in section > 6.5 of RFC8279 apply to BIERv6 packet processing. However, there are > some IPv6-specific processing procedures due to the base and general > procedures of IPv6. > > On the overlay layer, when a multicast packet enters the BIER domain > in a Non-MPLS IPv6 network, the Ingress BFR (BFIR) encapsulates the > multicast packet with a BIERv6 Header, transforming it to a BIERv6 Encapsulates instead of transform IMHO. > packet. The BIERv6 header includes an IPv6 header and IPv6 > Destination Options Header within a standard Non-MPLS BIER header. > Source Address field in the IPv6 header MUST be set to a routable > IPv6 unicast address of the BFIR. Destination Address field in the > IPv6 header is set to the End.BIER address of the next-hop BFR the > BIERv6 packet replicating to, no matter next-hop BFR is directly > connected (one-hop) or not directly connected (multi-hop). I think it would be good to provide in a fitting place some good justification/examples why especially BFR not acting as BFER would benefit from using any other addresses than the BIER prefix of the BFR. > > On the BIER layer, upon receiving an BIERv6 packet, the BFR processes > the IPv6 header first. This is the general procedure of IPv6. > > > > Xie, et al. Expires July 17, 2020 [Page 9] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > If the IPv6 Destination address is an End.BIER IPv6 unicast address > of this BFR, a 'BIER Specific Handling' indication will be obtained > by the preceding Unicast DA lookup (FIB lookup). The BIER option, if > exists, will be checked to decide which neighbor(s) to replicate the > BIERv6 packet to. > > It is a local behavior to handle the combination of extension > headers, options and the BIER option(s) in destination options header > when a 'BIER Specific Handling' indication is got by the preceding > FIB lookup. Early deployment of BIERv6 may require there is only one > BIER option TLV in the destination options header followed the IPv6 > header. How other extension headers or more BIER option TLVs in a > BIERv6 packet is handled is outside the scope of this document. Typically AFAIK, the handling of option headers is not tied to a avarying semantic of the destination address. I do understand that IPv6 SIDs have semantic tied to them, but is there an example how such a semantic would impact the handling of a particular destination option ? If there is, then it would be good to cite such an SRv6 function as another example of the desired behavior in this draft. I for once think that the idea of being able to modify the semantic of option headers based on the address is potentially useful (would need to figure out better examples), but: If there is a relevant customer community for BIERv6 that is not interested in SRv6, it would be better if the base functionality would not rely on SRv6 specific concepts, but if these SRv6/SID related options would be part of a specific section in this document like "BIERv6 with SIDs" or so. That way bot the IPv6, no SRv6 and IPv6+SRv6 customers would easier be made happy. > > A packet having a 'BIER Specific Handling' indication but not having > a BIER option is supposed to be a wrong packet or an ICMPv6 packet, Explain the "ICMPv6 packet" ? > and the process can be refered to the example in section 3.2. > > A packet not having a 'BIER Specific Handling' indication but having > a BIER option SHOULD be processed normally as unicast forwarding > procedures, which may be a behavior of drop, or send to CPU, or other > behaviors in existing implementations. SHOULD be processed normally as unicast forwarding procedures AFTER BIER replication ? E.g.: not quite sure which case yo're referring to here. > > The Destination Address field in the IPv6 Header MUST change to the > nexthop BFR's End.BIER Unicast address in BIERv6. > > The Hop Limit field of IPv6 header MUST decrease by 1 when sending > packets to a BFR neighbor, while the TTL in the BIER header MUST be > unchanged on a Non-BIER router, or decrease by 1 on a BFR. A non-BIER router would not operate on the BIER header or be addressed by a BIERv6 packet, so the middle part should be deleted, as its confusing. > The BitString in the BIER header in the Destination Options Header > may change when sending packets to a neighbor. Such change of > BitString MUST be aligned with the procedure defined in RFC8279. > Because of the requirement to change the content of the option when > forwarding BIERv6 packet, the BIER option type should have chg flag 1 > per section 4.2 of RFC8200. Maybe reorder these paragraphs in the order they are relevant, whereas the BIER processing would preceed the unicast sending of copies. > The procedures applies normally if a bit corresponding to the self > bfr-id is set in the bit-string field of the Non-MPLS BIER header of > the BIERv6 packet. The node is considered to be an Egress BFR (BFER) > in this case. he BFER removes the BIERv6 header, including the IPv6 > header and the Destination Options header, and copies the packet to > the multicast flow overlay. The egress VRF of a packet may be > determined by a further lookup on the IPv6 source address instead of > the upstream-assigned MPLS Label as described in [RFC8556]. Maybe you want to structure under subsections "BFIR", "BFR" and "BFER" behavior. In the BFER behavior it should be said that the BFER behavior is in addition to the unchanged BFER behavior and is based on creating another copy of the packet based on the BFER bit set, and that copy is locally consumed as follow.. Running out of time for now, hopefully can catch up with rest later. Very good for the document to have what looks on browsing like a comprehensive set of environmental sections below! Thanks a lot for the documt Toerless > > > > > > Xie, et al. Expires July 17, 2020 [Page 10] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > The Fragment Header, AH Header or ESP Header, if exists after the > BIER options header, can be processed on BFER only as part of the > multicast flow overlay process. > > 5. Security Considerations > > BIER IPv6 encapsulation provides a new encapsulation based on IPv6 > and BIER to transport multicast data packet in a BIER domain. The > BIER domain can be a single IGP area, an anonymous system (AS) with > multiple IGP areas, or multiple anonymous systems (ASes) operated by > a network operator. This section reviews security considerations > related to the BIER IPv6 encapsulation, based on security > considerations of [RFC8279], [RFC8296], and other documents related > to IPv6 extension. > > BIER-encapsulated packets should generally not be accepted from > untrusted interfaces or tunnels. For example, an operator may wish > to have a policy of accepting BIER-encapsulated packets only from > interfaces to trusted routers, and not from customer-facing > interfaces. See section 5.1 for normal Intra domain deployment. > > There may be applications that require a BFR to accept a BIER- > encapsulated packet from an interface to a system that is not > controlled by the network operator. See section 5.2 for inter domain > deployment. > > BIER IPv6 encapsulation may cause ICMP packet sent to BFIR and cause > security problems. See section 5.3 for ICMP related problems. > > This document introduces a new option used in IPv6 Destination > Options Header, together with the special-use IPv6 address called > End.BIER in IPv6 destination address for BIER IPv6 forwarding. > However the option newly introduced may be wrongly used with normal > IPv6 destination address. See section 5.4 for problems introduced by > the new IPv6 option with normal IPv6 destination address. > > If a BIER packet is altered, either the BIER header, or the multicast > data packet, by an intermediate router, packets may be lost, stolen, > or otherwise misdelivered. BIER IPv6 encapsulation provides the > ability of IPsec to ensure the confidentiality or integrity. See > section 5.5 for this security problem. > > A BIER router accepts and uses the End.BIER IPv6 address to construct > BIFT only when the IPv6 address is configured explicitly, or received > from a router via control-plane protocols. The received information > is validated using existing authentication and security mechanisms of > the control-plane protocols. BIER IPv6 encapsulation does not define > any additional security mechanism in existing control-plane > > > > Xie, et al. Expires July 17, 2020 [Page 11] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > protocols, and it inherits any security considerations that apply to > the control-plane protocols. > > 5.1. Intra Domain Deployment > > Generally nodes outside the BIER Domain are not trusted: they cannot > directly use the End.BIER of the domain. This is enforced by two > levels of access control lists: > > 1. Any packet entering the BIER Domain and destined to an End.BIER > IPv6 Address within the BIER Domain is dropped. This may be realized > with the following logic. Other methods with equivalent outcome are > considered compliant: > > * allocate all the End.BIER IPv6 Address from a block S/s > > * configure each external interface of each edge node of the domain > with an inbound infrastructure access list (IACL) which drops any > incoming packet with a destination address in S/s > > * Failure to implement this method of ingress filtering exposes the > BIER Domain to BIER attacks as described and referenced in [RFC8296]. > > 2. The distributed protection in #1 is complemented with per node > protection, dropping packets to End.BIER IPv6 Address from source > addresses outside the BIER Domain. This may be realized with the > following logic. Other methods with equivalent outcome are > considered compliant: > > * assign all interface addresses from prefix A/a > > * assign all the IPv6 addresses used as source address of BIER IPv6 > packets from a block B/b > > * at node k, all End.BIER IPv6 addresses local to k are assigned from > prefix Sk/sk > > * configure each internal interface of each BIER node k in the BIER > Domain with an inbound IACL which drops any incoming packet with a > destination address in Sk/sk if the source address is not in A/a or > B/b. > > For simplicity of deployment, a configuration of IACL effective for > all interfaces can be provided by a router. Such IACL can be > referred to as global IACL(GIACL) .Each BIER node k then simply > configs a GIACL which drops any incoming packet with a destination > address in Sk/sk if the source address is not in A/a or B/b for the > inter-domain deployment mode. > > > > Xie, et al. Expires July 17, 2020 [Page 12] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > 5.2. Inter Domain Deployment > > There may be applications that require a BFR to accept a BIER- > encapsulated packet from an interface to a system that is not > controlled by the network operator. For instance, there may be an > application in which a virtual machine in a data center submits BIER- > encapsulated packets to a router. In such a case, it is desirable to > verify that the packet is from a legitimate source and that its > BitString denotes only systems to which that source is allowed to > send. Using BIER IPv6 encapsulation, IACL can be configured on each > internal interface of each BIER node k to allow packet with a > destination address in Sk/sk and the source address is in an allowed > list of IPv6 address. However, the BIER IPv6 encapsulation itself > does not provide a way to verify that the source is legitimate or the > source is allowed to set any particular set of bits in the BitString. > > The IACL allowing specific IPv6 address outside the domain of a > network operator can be more strict by the following method: > > * configure one sub-domain using only one bit string length, and a > seperate End.BIER for this sub-domain as a service opened to agreed > source(s) outside the domain of the operator's network. > > * configure on BIER node to check if the End.BIER address of a packet > is the correct one bound to the sub-domain of a packet. > > * configure IACL on each interface of each BIER node k (or simply > configure GIACL on each BIER node k) to allow packet with an End.BIER > as destination address and the allowed source(s) as source address. > > This provides a way to ensure that the inter-domain source is allowed > to access only the BIER IPv6 transport service bound to a sub-domain > with a specific bit string length. > > 5.3. ICMP Error Processing > > ICMP error packets generated within the BIER Domain are sent to > source nodes within the BIER Domain. > > A large number of ICMP may be elicited and sent to a BFIR router, in > case when a BIER IPv6 packet is filled with wrong TTL, either error > or malfeasance. A rate-limiting of ICMP packet should be implemented > on each BFR. > > The ingress node can take note of the fact that it is getting, in > response to BIER IPv6 packet, one or more ICMP error packets. By > default, the reception of such a packets MUST be countered and > logged. However, it is possible for such log entries to be "false > > > > Xie, et al. Expires July 17, 2020 [Page 13] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > positives" that generate a lot of "noise" in the log; therefore, > implementations SHOULD have a knob to disable this logging. > > OAM functions of PING and TRACE for BIER IPv6 encapsulation may also > need ICMP based on BIER IPv6 encapsulation and cause ICMP response > message containing BIER option. The ability of seperating such OAM > ICMP packets from error ICMP packets caused by error is necessary for > the availability of OAM, otherwise the OAM function may fail due to > the rate-limiting of ICMP error packets. > > 5.4. Security caused by BIER option > > This document introduces a new option used in IPv6 Destination > Options Header. An IPv6 packet with a normal IPv6 address of a > router (e.g. loopback IPv6 address of the router) as destination > address will possibly carry a BIER option. > > For a router incapable of BIERv6, such BIERv6 packet will not be > processed by the procedure described in this document, but be > processed as normal IPv6 packet with unknown option, and the existing > security considerations for handling IPv6 options apply. Possible > way of handling IPv6 packets with BIER option may be send to CPU for > slow path processing, with rate-limiting, or be discarded according > to the local policy. > > For a router capable of BIERv6, such BIERv6 packet MUST NOT be > forwarded, but should be processed as a normal IPv6 packet with > unknown option, or additionally and optionally be countered and > logged if the router is capable of doing so. > > 5.5. Applicability of IPsec > > IPsec [RFC4301] uses two protocols to provide traffic security > services -- Authentication Header (AH) [RFC4302] and Encapsulating > Security Payload (ESP) [RFC4303]. Each protocol supports two modes > of use: transport mode and tunnel mode. IPsec support both unicast > and multicast. IPsec implementations MUST support ESP and MAY > support AH. > > This document assume IPsec working in tunnel mode with inner IPv4 or > IPv6 multicast packet encapsulated in outer BIERv6 header and IPsec > header(s). > > IPsec used with BIER IPv6 encapsulation to ensure that a BIER payload > is not altered while in transit between BFIR and BFERs. If a BFR in > between BFIR and BFERs is compromised, there is no way to prevent the > compromised BFR from making illegitimate modifications to the BIER > payload or to prevent it from misforwarding or misdelivering the > > > > Xie, et al. Expires July 17, 2020 [Page 14] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > BIER-encapsulated packet, but the BFERs will detect the illegitimate > modifications to the BIER Payload (or the inner multicast data > packet). This could provide cryptographic integrity protection for > multicast data transport. This capability of IPsec comes from the > design that, the destination options header carrying the BIER header > is located before the AH or ESP and the BFR routers in between BFIR > and BFERs can process the BIER header without aware of AH or ESP. > > For ESP, the Integrity Check Value (ICV) is computed over the ESP > header, Payload, and ESP trailer fields. It doesn't require the IP > or extension header for ICV calculating, and thus the change of DA > and BIER option data does not affect the function of ESP. > > For AH, the Integrity Check Value (ICV) is computed over the IP or > extension header fields before the AH header, the AH header, and the > Payload. The IPv6 DA is immutable for unicast traffic in AH, and the > change of DA in BIER IPv6 forwarding for multicast traffic is > incompatible to this rule. How AH is extended to support multicast > traffic transporting through BIER IPv6 encapsulation is outside the > scope of this document. > > The detailed control-plane for BIER IPv6 encapsulation IPsec function > is outside the scope of the document. Internet Key Exchange Protocol > Version 2 (IKEv2) [RFC5996] and Group Security Association (GSA) > [RFC5374] can be referred to for further studying. > > 6. IANA Considerations > > 6.1. BIER Option Type > > Allocation is expected from IANA for a BIER Option Type codepoint > from the "Destination Options and Hop-by-Hop Options" sub-registry of > the "Internet Protocol Version 6 (IPv6) Parameters" registry. The > value 0x70 is suggested. > > +-----------+-----+-----+-------+-------------+------------+ > | Hex Value | act | chg | rest | Description | Reference | > +-----------+-----+-----+-------+-------------+------------+ > | 0x70 | 01 | 1 | 10000 | BIER Option | This draft | > +-----------+-----+-----+-------+-------------+------------+ > > 6.2. End.BIER Function > > Allocation is expected from IANA for an End.BIER function codepoint > from the "SRv6 Endpoint Behaviors" sub-registry. The value 60 is > suggested. > > > > > > Xie, et al. Expires July 17, 2020 [Page 15] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > +-------+--------+--------------------------+------------+ > | Value | Hex | Endpoint function | Reference | > +-------+--------+--------------------------+------------+ > | TBD | TBD | End.BIER | This draft | > +-------+--------+--------------------------+------------+ > > 6.3. BIER Next Protocol Identifiers > > Allocation is expected from IANA for a BIER Proto codepoint from the > "BIER Next Protocol Identifiers" sub-registry. > > TBD1: Delivering the packet with VRF lookup in IPv6 source address > > 7. Acknowledgements > > The authors would like to thank Stig Venaas for his valuable > comments. Thanks IJsbrand Wijnands, Greg Shepherd, Tony Przygienda, > Toerless Eckert, Jeffrey Zhang for the helpful comments to improve > this document. > > Thanks Aijun Wang for comments about BIER OAM function in BIER IPv6 > encapsulation. > > Thanks Mach Chen for review and suggestions about BIER-PING function > in BIER IPv6 encapsulation. > > 8. Contributors > > Gang Yan > > Huawei Technologies > > China > > Email: yangang@huawei.com > > Yang(Yolanda) Xia > > Huawei Technologies > > China > > Email: yolanda.xia@huawei.com > > > > > > > > > Xie, et al. Expires July 17, 2020 [Page 16] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > 9. References > > 9.1. Normative References > > [RFC4301] Kent, S. and K. Seo, "Security Architecture for the > Internet Protocol", RFC 4301, DOI 10.17487/RFC4301, > December 2005, . > > [RFC4302] Kent, S., "IP Authentication Header", RFC 4302, > DOI 10.17487/RFC4302, December 2005, > . > > [RFC4303] Kent, S., "IP Encapsulating Security Payload (ESP)", > RFC 4303, DOI 10.17487/RFC4303, December 2005, > . > > [RFC5374] Weis, B., Gross, G., and D. Ignjatic, "Multicast > Extensions to the Security Architecture for the Internet > Protocol", RFC 5374, DOI 10.17487/RFC5374, November 2008, > . > > [RFC5996] Kaufman, C., Hoffman, P., Nir, Y., and P. Eronen, > "Internet Key Exchange Protocol Version 2 (IKEv2)", > RFC 5996, DOI 10.17487/RFC5996, September 2010, > . > > [RFC6275] Perkins, C., Ed., Johnson, D., and J. Arkko, "Mobility > Support in IPv6", RFC 6275, DOI 10.17487/RFC6275, July > 2011, . > > [RFC8200] Deering, S. and R. Hinden, "Internet Protocol, Version 6 > (IPv6) Specification", STD 86, RFC 8200, > DOI 10.17487/RFC8200, July 2017, > . > > [RFC8279] Wijnands, IJ., Ed., Rosen, E., Ed., Dolganow, A., > Przygienda, T., and S. Aldrin, "Multicast Using Bit Index > Explicit Replication (BIER)", RFC 8279, > DOI 10.17487/RFC8279, November 2017, > . > > [RFC8296] Wijnands, IJ., Ed., Rosen, E., Ed., Dolganow, A., > Tantsura, J., Aldrin, S., and I. Meilik, "Encapsulation > for Bit Index Explicit Replication (BIER) in MPLS and Non- > MPLS Networks", RFC 8296, DOI 10.17487/RFC8296, January > 2018, . > > > > > > Xie, et al. Expires July 17, 2020 [Page 17] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > [RFC8556] Rosen, E., Ed., Sivakumar, M., Przygienda, T., Aldrin, S., > and A. Dolganow, "Multicast VPN Using Bit Index Explicit > Replication (BIER)", RFC 8556, DOI 10.17487/RFC8556, April > 2019, . > > 9.2. Informative References > > [I-D.ietf-bier-ipv6-requirements] > McBride, M., Xie, J., Dhanaraj, S., and R. Asati, "BIER > IPv6 Requirements", draft-ietf-bier-ipv6-requirements-03 > (work in progress), November 2019. > > [I-D.ietf-bier-ping] > Kumar, N., Pignataro, C., Akiya, N., Zheng, L., Chen, M., > and G. Mirsky, "BIER Ping and Trace", draft-ietf-bier- > ping-06 (work in progress), October 2019. > > [I-D.ietf-spring-srv6-network-programming] > Filsfils, C., Camarillo, P., Leddy, J., Voyer, D., > Matsushima, S., and Z. Li, "SRv6 Network Programming", > draft-ietf-spring-srv6-network-programming-07 (work in > progress), December 2019. > > [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate > Requirement Levels", BCP 14, RFC 2119, > DOI 10.17487/RFC2119, March 1997, > . > > [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC > 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, > May 2017, . > > Authors' Addresses > > Jingrong Xie > Huawei Technologies > > Email: xiejingrong@huawei.com > > > Liang Geng > China Mobile > Beijing 10053 > > Email: gengliang@chinamobile.com > > > > > > > Xie, et al. Expires July 17, 2020 [Page 18] > > Internet-Draft Encapsulation for BIER in IPv6 January 2020 > > > Mike McBride > Futurewei > > Email: mmcbride7@gmail.com > > > Rajiv Asati > Cisco > > Email: rajiva@cisco.com > > > Senthil Dhanaraj > Huawei > > Email: senthil.dhanaraj@huawei.com > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Xie, et al. Expires July 17, 2020 [Page 19] From nobody Wed Mar 11 21:24:41 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D96E23A0D33 for ; Wed, 11 Mar 2020 21:24:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.95 X-Spam-Level: X-Spam-Status: No, score=-3.95 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id couUyvYR1KeZ for ; Wed, 11 Mar 2020 21:24:34 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9B23F3A0D31 for ; Wed, 11 Mar 2020 21:24:33 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 16342548049 for ; Thu, 12 Mar 2020 05:24:29 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id 144FC440040; Thu, 12 Mar 2020 05:24:29 +0100 (CET) Date: Thu, 12 Mar 2020 05:24:29 +0100 From: Toerless Eckert To: bier@ietf.org Message-ID: <20200312042429.GA12383@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 04:24:39 -0000 Comments on subject document inline. Thanks a lot for the work. > > > > > BIER Z. Zhang > Internet-Draft ZTE Corporation > Intended status: Standards Track A. Przygienda > Expires: July 11, 2020 Juniper Networks, Inc. > I. Wijnands > Cisco Systems > H. Bidgoli > Nokia > M. McBride > Futurewei > January 8, 2020 > > > BIER in IPv6 (BIERin6) > draft-zhang-bier-bierin6-04 > > Abstract > > BIER is a new architecture for the forwarding of multicast data > packets. This document defines native IPv6 encapsulation for BIER > hop-by-hop forwarding or BIERin6 for short. Would suggest to change to something that does not say "native", because the option described in this document of using ethernet-nonMPLS-BIER-IPv6 encapsulation might not be seen as "native IPv6 encap" by IPv6 purists. Propose: "This document defines encapsulation hop-by-hop BIER forwarding for IPv6, non-MPLS networks called BIERin6." > Requirements Language > > The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", > "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this > document are to be interpreted as described in RFC2119. > > Status of This Memo > > This Internet-Draft is submitted in full conformance with the > provisions of BCP 78 and BCP 79. > > Internet-Drafts are working documents of the Internet Engineering > Task Force (IETF). Note that other groups may also distribute > working documents as Internet-Drafts. The list of current Internet- > Drafts is at https://datatracker.ietf.org/drafts/current/. > > Internet-Drafts are draft documents valid for a maximum of six months > and may be updated, replaced, or obsoleted by other documents at any > time. It is inappropriate to use Internet-Drafts as reference > material or to cite them other than as "work in progress." > > This Internet-Draft will expire on July 11, 2020. > > > > > > > > Zhang, et al. Expires July 11, 2020 [Page 1] > > Internet-Draft BIERv6 January 2020 > > > Copyright Notice > > Copyright (c) 2020 IETF Trust and the persons identified as the > document authors. All rights reserved. > > This document is subject to BCP 78 and the IETF Trust's Legal > Provisions Relating to IETF Documents > (https://trustee.ietf.org/license-info) in effect on the date of > publication of this document. Please review these documents > carefully, as they describe your rights and restrictions with respect > to this document. Code Components extracted from this document must > include Simplified BSD License text as described in Section 4.e of > the Trust Legal Provisions and are provided without warranty as > described in the Simplified BSD License. > > Table of Contents > > 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 > 2. IPv6 Header . . . . . . . . . . . . . . . . . . . . . . . . . 3 > 2.1. IPv6 Options Considerations . . . . . . . . . . . . . . . 3 > 3. BIER Header . . . . . . . . . . . . . . . . . . . . . . . . . 4 > 4. IPv6 Encapsulation Advertisement . . . . . . . . . . . . . . 4 > 4.1. Format . . . . . . . . . . . . . . . . . . . . . . . . . 4 > 4.2. Inter-area prefix redistribution . . . . . . . . . . . . 5 > 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5 > 6. Security Considerations . . . . . . . . . . . . . . . . . . . 5 > 7. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 5 > 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 5 > 8.1. Normative References . . . . . . . . . . . . . . . . . . 6 > 8.2. Informative References . . . . . . . . . . . . . . . . . 6 > Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7 > > 1. Introduction > > BIER [RFC8279] is a new architecture for the forwarding of multicast > data packets. It provides optimal forwarding through a "multicast > domain" and it does not necessarily precondition construction of a > multicast distribution tree, nor does it require intermediate nodes > to maintain any per-flow state. > > This document specifies non-MPLS BIER forwarding in an IPv6 [RFC8200] > environment, refferred to as BIERin6, using non-MPLS BIER > encapsulation specified in [RFC8296]. This version of the sentence could also go into the abstract ;-) > MPLS BIER forwarding in IPv6 is outside the scope of this document. > > This document uses terminology defined in [RFC8279] and [RFC8296]. > > > > > Zhang, et al. Expires July 11, 2020 [Page 2] > > Internet-Draft BIERv6 January 2020 > > > [RFC8296] defines the BIER encapsulation format in MPLS and non-MPLS > environment. In case of non-MPLS environment, a BIER packet is the > payload of an "outer" encapsulation, which has a "next protocol" > codepoint that is set to a value that means "non-MPLS BIER". > > That can be used as is in a pure IPv6 non-mpls environment. Between > two directly connected BFRs, a BIER header could directly follow link > layer header, e.g., an Ethernet header (with the Ethertype set to > 0xAB37). If a BFR needs to tunnel BIER packets to another BFR, e.g. ^^^^^^^^ Please add reference "according to RFC8296 section 2.2.3. > per [RFC8279] Section 6.9, It would be worth IMHO to describe here that section RFC8279 6.9 describes mechanisms to support partial BIER deployment by automatically calculating non-adjacent downstream BFR and then uses tunneling to them to hop over the non-BIER capable routers. > IPv6 encapsulation can be used, with the > destination address being the downstream BFR and the Next Header > field set to a to-be-assigned value for "non-MPLS BIER". Would be clearer to state that RFC8279 does not prescribe an IPv6 next header type to encapsulate BIER into IPv6, but that this document does this and uses the name "non-MPLS BIER" for it. Also RFC8296 already uses the term "non-MPLS BIER" for Ethertype 0xAB37, so it would be an overload (*gasp* ;-) of that term to also use it for a TBD IPv6 Next Header codepoint. Maybe come up with another name for the TBD codepoint or use "non-MPLS BIER Ethertype" vs. "non-MPLS BIER IPv6 NH". > The IPv6 encapsulation could be used even between two directly > connected BFRs in the following two cases: > > o An operator mandates all traffic to be carried in IPv6. An example (like on belows point) would help to motivate this. IPv6-only forwarding plane features such as monitoring or filtering come to mind. > o A BFR does not have BIER support in its "fast forwarding path" and > relies on "slow/software forwarding path", e.g. in environments > like [RFC7368] where high throughput multicast forwarding > performance is not critical. > > 2. IPv6 Header > > Whenever IPv6 encapsulation is used for BIER forwarding, The Next > Header field in the IPv6 Header (if there are no extension headers), > or the Next Header field in the last extension header is set to TBD, > indicating that the payload is a BIER packet. Maybe use numbered TBD (TBD1) and introduce that TBD1 above where you first talk about it. > If the neighbor is directly connected, The destination address in > IPv6 header SHOULD be the neighbor's link-local address on this > router's outgoing interface, the source destination address SHOULD be > this router's link-local address on the outgoing interface, and the > IPv6 TTL MUST be set to 1. I've started a thread on 6man/6ops re. link-local-tunnel traffic as i have the same also in my ANIMA draft, and in implementations i have seen quite some issues tunneling traffic HW accelerated across IPv6 link-local addresses and TTL=1. Would welcome implementers in BIER to chime in if they would see this as an issue. If folks feel supporting this HW accelerated might be more complicated than non-link-local tunnels, then it might be useful to change the text to also allow/require support for using the BFR address even for subnet adjacent BFR. In that case one would not use HL=1, and that too i have seen to be a problem in HW accelerated forwarding plane: HL/TTL=1 -> MUST punt (software processing). > Otherwise, the destination address SHOULD > be the BIER prefix of the BFR neighbor, the source address SHOULD be > this router's BIER prefix, and the TTL MUST be large enough to get > the packet to the BFR neighbor. (Hop-limit, not TTL, MLD, not IGMP, everything gets better by new names ;-). > The Flow-ID in the IPv6 packet SHOULD be copied from the entropy > field in the BIER encapsulation. > > 2.1. IPv6 Options Considerations > > RFC 8200 section 4, defines the IPv6 extension headers. Currently > there are two defined extension headers, Hop-by-Hop and Destination > options header, which can carry a variable number of options. These draft-ietf-6man-segment-routing-header is Routing Header, not Hop-by-Hop or Destination. > extension headers are inserted by the source node. > > > > Zhang, et al. Expires July 11, 2020 [Page 3] > > Internet-Draft BIERv6 January 2020 > > > For directly connected BIER routers, IPv6 Hop-by-Hop or Destination > options are irrelevant and SHOULD NOT be inserted by BFIR on the > BIERin6 packet. In this case IPv6 header, Next Header field should > be set to TBD. Any IPv6 packet arriving on BFRs and BFERs, with > multiple extension header where the last extension header has a Next > Header field set to TBD, SHOULD be discard and the node should > transmit an ICMP Parameter Problem message to the source of the > packet (BFIR) with an ICMP code value of TBD10 ('invalid options for > BIERin6'). > > This also indicates that for disjoint BIER routers using IPv6 disjoint == Non subnet-adjacent ? > encapsulation, there SHOULD NOT be any IPv6 Hop-by-Hop or Destination > options be present in a BIERin6 packet. This is a bit confusing, first you write what seems to only apply to adjacent BFR, then in the next paragraph you seem to expand it to non-adjacent BFR. Maybe rewrite so it says you do not like hop-by-hop options and destination options whether the BFR are adjacent or not ? Don't have a strong opinion content wise. In general, this is kinda safe and may make implementations easier, and can always be superceeded by anothre RFC when there is an interesting option in he future we would like to use with this encap. On the other hand, if/when there is such an option header, there MUST be another RFC to make it applicable to this RFC (by overriding it). > In this case, if additional > traffic engineering is required, IPv6 tunneling (i.e. BIERin6 over > SRv6) can be implemented. Given how the model described in this draft (source address is the sending BFR, not the BFIR), is really end-to-end BIER (not end-to-end IPv6), i think each (adjacent, non-adjacent) BIER-hops IPv6 encapsulation is indeed IPv6 tunneling, so it is confusing/incorrect to use the term "IPv6 tunneling" here only in the context of SRv6. I would propose to improve the text to introduce the notion of "IPv6 tunneling" earlier and explain at the point earlier where you start to dsicuss option headers, that routing-headers are fine. If you want to use a much longer used form of IPv6 routing header than SRv6 SRH, use the RPL Source Routing Header (RFC6554). Its also much more widely deployed (millions of routers) > 3. BIER Header > > The BIER header MUST be encoded per Section 4.2 of [RFC8296]. > > The BIFT-id is either encoded per > [I-D.ietf-bier-non-mpls-bift-encoding] or per advertised by BFRs, as > specificed in [I-D.dhanaraj-bier-lsr-ethernet-extensions]. > > 4. IPv6 Encapsulation Advertisement Seems like it would help to restructure 2,3 under forwarding plane and 4 a=under control/routing-plane sections ? Also: Didn't i remember something from Alia saying that future control plane work should be done in LSR ? I may be wrong. Just wondering if this section can still be in this draft. Would make life easier, but we're still IETF.. ;-) > When IPv6 encapsulation is not required between directly connected > BFRs, no signaling in addition to that specified in > [I-D.dhanaraj-bier-lsr-ethernet-extensions] is needed. > > Otherwise, a node that requires IPv6 encapsualtion MUST advertise the > BIER IPv6 transportation sub-TLV/sub-sub-TLV according to local > configuration or policy in the BIER domain to request other BFRs to > always use IPv6 encapsulation. > > In presence of multiple encapsulation possibilities hop-by-hop it is > a matter of local policy which encapsulation is imposed and the > receiving router MUST accept all encapsulations that it advertised. > > 4.1. Format > > The BIER IPv6 transportation is a new sub-TLV of BIER defined in OSPF > [RFC8444], and a new sub-sub-TLV of BIER Info sub-TLV defined in ISIS > [RFC8401]. > > > > > > > > Zhang, et al. Expires July 11, 2020 [Page 4] > > Internet-Draft BIERv6 January 2020 > > > 0 1 2 3 > 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > | Type | Length | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > o Type: For OSPF, value TBD1 (prefer 12) is used to indicate it is > the IPv6 transportation sub-TLV. For ISIS, value TBD2 (prefer 3) > is used to indicate it is the IPv6 transportation sub-sub-TLV. > > o Length: 0. Not quite sure about the policies (others in the WG will know better): Should this document be "Updates" to those two RFCs ? If i where to implement ISIS/OSPF for BIER (or troubleshoot it on the wirese, write wireshark modules, etc. pp), marking this document an update would help to find it, but technically, this is just an extension, not changing anything, so i am not sure if it even can be an update. The other point is whether or not to distinguish if link-local or BFR address are supported for IPv6 encapsulation. Given my past pain with IPv6 link-local HW support, i would certainly like to see the ability to announce what amounts to "this node can only encap/decap for its BFR address, but not link-local - but please send me also to that address if you're subnet adjacent". > 4.2. Inter-area prefix redistribution > > When BFR-prefixes are advertised across IGP areas per > [I-D.dhanaraj-bier-lsr-ethernet-extensions] or redistributed across > protocol boundaries per [I-D.zwzw-bier-prefix-redistribute], the BIER > IPv6 transportation sub-TLV or sub-sub-TLV MAY be re-advertised/re- > distributed as well. Ok, what is missing up to here is an upfront explanation that this draft is end-to-end (BFIR to BFER) BIER with hop-by-hop L2 encap and/or IPv6 tunnels. And discuss the implications. For example, you will not get ICMP error messages all the way back to the BFIR as you would get in a model where forwarding was hop-by-hop IPv6 (plus BIER). I have no opinions how relevant this is, but today if an SP does end-to-end IPv6, then he would get forwarding errors back to the encap router in his network (assuiming that customer traffic is IPv6 encapsulated there). Likewise, there is no end-to-end PMTUD from IPv6 supported in this model (which i think is stupid anyhow for multicast, so i am not saying this as an argument against this method, just to make sure that users coming from IPv6 understand all the implications). > 5. IANA Considerations > > IANA is requested to assign a new "BIER" type for "Next Header" in > the "Assigned Internet Protocol Numbers" registry. BIERin6 ? > IANA is requested to assign a new "BIERin6" type for "invalid > options" in the "ICMP code value" registry. > > IANA is requested to assign a new "BIER IPv6 transportation Sub-TLV" > type in the "OSPFv2 Extended Prefix TLV Sub-TLVs" Registry. I would prefer "tunnel" instead of transport given how a new IPv6 header is added. > IANA is requested to set up a new "BIER IPv6 transportation Sub-sub- > TLV" type in the "IS-IS BIER Info sub-TLV" Registry. same here. > 6. Security Considerations > > General IPv6 and BIER security considerations apply. I am sure someone will have more security consideration ideas, but not me, not today . ;-) > 7. Acknowledgement > > The authors would like to thank Jeffrey Zhang for his review and > valuable contributions. > > 8. References > Thanks a lot for the document Toerless > > > > > > > Zhang, et al. Expires July 11, 2020 [Page 5] > > Internet-Draft BIERv6 January 2020 > > > 8.1. Normative References > > [RFC8200] Deering, S. and R. Hinden, "Internet Protocol, Version 6 > (IPv6) Specification", STD 86, RFC 8200, > DOI 10.17487/RFC8200, July 2017, > . > > [RFC8279] Wijnands, IJ., Ed., Rosen, E., Ed., Dolganow, A., > Przygienda, T., and S. Aldrin, "Multicast Using Bit Index > Explicit Replication (BIER)", RFC 8279, > DOI 10.17487/RFC8279, November 2017, > . > > [RFC8296] Wijnands, IJ., Ed., Rosen, E., Ed., Dolganow, A., > Tantsura, J., Aldrin, S., and I. Meilik, "Encapsulation > for Bit Index Explicit Replication (BIER) in MPLS and Non- > MPLS Networks", RFC 8296, DOI 10.17487/RFC8296, January > 2018, . > > [RFC8401] Ginsberg, L., Ed., Przygienda, T., Aldrin, S., and Z. > Zhang, "Bit Index Explicit Replication (BIER) Support via > IS-IS", RFC 8401, DOI 10.17487/RFC8401, June 2018, > . > > [RFC8444] Psenak, P., Ed., Kumar, N., Wijnands, IJ., Dolganow, A., > Przygienda, T., Zhang, J., and S. Aldrin, "OSPFv2 > Extensions for Bit Index Explicit Replication (BIER)", > RFC 8444, DOI 10.17487/RFC8444, November 2018, > . > > 8.2. Informative References > > [I-D.dhanaraj-bier-lsr-ethernet-extensions] > Dhanaraj, S., Wijnands, I., Psenak, P., Zhang, Z., Yan, > G., and J. Xie, "LSR Extensions for BIER over Ethernet", > draft-dhanaraj-bier-lsr-ethernet-extensions-00 (work in > progress), January 2019. > > [I-D.ietf-bier-bar-ipa] > Zhang, Z., Przygienda, T., Dolganow, A., Bidgoli, H., > Wijnands, I., and A. Gulko, "BIER Underlay Path > Calculation Algorithm and Constraints", draft-ietf-bier- > bar-ipa-06 (work in progress), November 2019. > > [I-D.ietf-bier-idr-extensions] > Xu, X., Chen, M., Patel, K., Wijnands, I., and T. > Przygienda, "BGP Extensions for BIER", draft-ietf-bier- > idr-extensions-07 (work in progress), September 2019. > > > > Zhang, et al. Expires July 11, 2020 [Page 6] > > Internet-Draft BIERv6 January 2020 > > > [I-D.ietf-bier-non-mpls-bift-encoding] > Wijnands, I., Xu, X., and H. Bidgoli, "An Optional > Encoding of the BIFT-id Field in the non-MPLS BIER > Encapsulation", draft-ietf-bier-non-mpls-bift-encoding-02 > (work in progress), August 2019. > > [I-D.zhang-bier-babel-extensions] > Zhang, Z. and T. Przygienda, "BIER in BABEL", draft-zhang- > bier-babel-extensions-02 (work in progress), November > 2019. > > [I-D.zwzw-bier-prefix-redistribute] > Zhang, Z., Bo, W., Zhang, Z., and I. Wijnands, "BIER > Prefix Redistribute", draft-zwzw-bier-prefix- > redistribute-03 (work in progress), September 2019. > > [RFC7368] Chown, T., Ed., Arkko, J., Brandt, A., Troan, O., and J. > Weil, "IPv6 Home Networking Architecture Principles", > RFC 7368, DOI 10.17487/RFC7368, October 2014, > . > > Authors' Addresses > > Zheng(Sandy) Zhang > ZTE Corporation > > EMail: zzhang_ietf@hotmail.com > > > Tony Przygienda > Juniper Networks, Inc. > > EMail: prz@juniper.net > > > IJsbrand Wijnands > Cisco Systems > > EMail: ice@cisco.com > > > Hooman Bidgoli > Nokia > > EMail: hooman.bidgoli@nokia.com > > > > > > > Zhang, et al. Expires July 11, 2020 [Page 7] > > Internet-Draft BIERv6 January 2020 > > > Mike McBride > Futurewei > > EMail: mmcbride@futurewei.com > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Zhang, et al. Expires July 11, 2020 [Page 8] From nobody Wed Mar 11 21:29:16 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D57403A0D49; Wed, 11 Mar 2020 21:29:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.65 X-Spam-Level: X-Spam-Status: No, score=-1.65 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bcD9CBRIwHwe; Wed, 11 Mar 2020 21:29:11 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 777C73A0D47; Wed, 11 Mar 2020 21:29:11 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id D9FF354804A; Thu, 12 Mar 2020 05:29:05 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id D11B5440040; Thu, 12 Mar 2020 05:29:05 +0100 (CET) Date: Thu, 12 Mar 2020 05:29:05 +0100 From: Toerless Eckert To: Tony Przygienda Cc: "zhang.zheng" , Xiejingrong , BIER WG , bier-ads@ietf.org, draft-xie-bier-ipv6-encapsulation@ietf.org, BIER WG Chairs Message-ID: <20200312042905.GD2331@faui48f.informatik.uni-erlangen.de> References: <5fdea958d2d146439d36e4b604e32abd@huawei.com> <202003102210042651244@zte.com.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: [Bier] comments re the two IPv6 encapsulation drafts (was: Re: Request an adoption call) ondraft-xie-bier-ipv6-encapsulation-05 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 04:29:14 -0000 Just glanced through both documents (draft-xie-bier-ipv6-encapsulation, draft-zhang-bier-bierin6). Thanks a lot for the work. draft-zhang seems to have a lot more security/deployment considerations i haven't gotten to read through yet, i would hope any final document would have a good amount of such type of information as well. Neither document has a comparison with the other, and however we go forward, i would very much hope that the choices made will be compared and disccussed vs. the choices not made in a final document. And if we start now comparing the options, it could help to conclude on a more technical basis than "mayority of authors" or the like. IMHO the differences are not very big in their core. Seems like Sandy's draft proposes to use a BIER in IPv6 Next-Header (NH) and Xiejing's draft proposes to use a destination option header. Xiejing's draft also has ideas how to embed the functionality more with SRv6/SID concepts which seems like an interesting idea for BIER in SRv6 networks. Not sure if this could be done equally with NH encoding. I would hesitate to decide on the header encap choice solely within BIER: While in general, BIER can do a lot of decisions all by itself, i think when it comes to IPv6 encapsulation, its probably good to also ask v6ops/6man/spring about their opinions first: Even if we do not want to bother about their preference, we may want to bother about any showstoppers they might raise later in IETF/IESG review. Have both of these approaches been presented in v6ops/6man/spring and asked for preferences vs. the other option ? If yes, then where would i find a summary of the feedback ? (hint: sections to be removed by RFC editor are a great way to avoid having to search through a long mailing list like bier or IETF meetng notes). Finally: Personally i mostly care if/how either of these options differ in the capability to be broadly adopted in HW accelerated forwarding plane at max speed. If there are certain principles that make one option better than the other, it would be good to document. And i hope the folks with HW knowledge would not solely judge from them being author on a particular document. One point related to forwarding efficiency and comparison between the documents: In Sandy's draft there is the option for per BIER-hop to use "only" L2 encap or IPv6 encap. Those BIER-hops look like a nice optimization, but from at least some of the forwarding planes i know, it would be faster not to have to do IPv6 encap/decap on many hops along the path, because some are L2 BIER capable and some not, but to keep the IPv6 header and just do address-field(s) rewrite (and of course Bitstring rewrite). Given how we assume SPF IGPs, i think the best choice would be for the BFIR to determine if the SPF path is completely L2 capable and then send with L2 header, else send with L3 header and BFRs would actually forward with the header they received the packet with (L2 or L3). Note that i think that Xiejing's draft cold equally support the L2 encap options if desired. But 'd first figure out if we really need that "mixed" forwarding. Cheers Toerless On Tue, Mar 10, 2020 at 07:43:34AM -0700, Tony Przygienda wrote: > I will try to get on call with Greg this week if we manage to find the time > and we'll look @ the minutes/new version of draft and direct further ... > > thanks > > --- tony > > On Tue, Mar 10, 2020 at 7:10 AM wrote: > > > Hi Jingrong, > > > > > > Sorry, I don't know you can't remember that there is consensus with the > > irrelevance between BIER and SRv6. > > > > SRv6 doesn't exist in BIER charter at all. So I mention it again for > > draft-xie-bier-ipv6-encapsulation. > > > > > > The homenet is one of the deployment of BIERin6 (draft-zhang-bier-bierin6 > > ). > > > > About the draft process, I believe that chair control the WG process > > reasonably. > > > > > > Thanks, > > > > Sandy > > > > > > ???????????? > > *????????????*Xiejingrong(Jingrong) > > *????????????*??????00007940; > > *????????????*bier-chairs@ietf.org ;bier@ietf.org < > > bier@ietf.org>;bier-ads@ietf.org ; > > draft-xie-bier-ipv6-encapsulation@ietf.org < > > draft-xie-bier-ipv6-encapsulation@ietf.org>; > > *??? ??? ???*2020???03???10??? 18:15 > > *??? ??? ???**RE: Re:Request an adoption call > > ondraft-xie-bier-ipv6-encapsulation-05* > > > > Dear Sandy, > > > > > > > > I suppose I have addressed all the comments received on the > > draft-xie-bier-ipv6-encapsulation, and that???s the main point in my request > > of adoption in Jan 2020 and today. > > > > Please point out what???s the comments that haven???t addressed. > > > > > > > > Thanks for remind me the IETF105 meeting minutes. > > > > I don???t know why that said thing ???Take it to list??? didn???t happen after 7 > > months ! > > > > Is it assumed that some questions are not addressed or not clear ---- for > > example, security considerations? Or the said ???Primary intended use is > > HOMENET??? does not explicitly declared in the document ? > > > > > > > > Thanks > > > > Jingrong > > > > > > > > *From:* zhang.zheng@zte.com.cn [mailto:zhang.zheng@zte.com.cn] > > *Sent:* Tuesday, March 10, 2020 4:59 PM > > *To:* Xiejingrong (Jingrong) > > *Cc:* bier-chairs@ietf.org; bier@ietf.org; bier-ads@ietf.org; > > draft-xie-bier-ipv6-encapsulation@ietf.org > > *Subject:* Re:Request an adoption call > > ondraft-xie-bier-ipv6-encapsulation-05 > > > > > > > > Hi Jingrong, > > > > > > > > Before being in adoption call, you may need to solve all the question > > about (draft-xie-bier-ipv6-encapsulation) at first (in meeting and > > mailing list). > > > > Its a pit that you didn't konw the consensus withdraft-zhang-bier-bierin6 > > even if you were on BIER WG bluesheet in IETF105# ( > > https://www.ietf.org/proceedings/105/bluesheets/bluesheets-105-bier-201907241330-00.pdf > > ). > > > > Please have a look at the minutes again ( > > https://tools.ietf.org/wg/bier/minutes?item=minutes-105-bier-01.html). > > > > I think it's a baseline that the draft has gotten consensus in WG before > > it's taken to the adoption list. > > > > > > > > BTW: You may have misunderstanding about WG secretary. > > > > AFAIK, WG secretary just does WG routine work, and there is no > > relationship with technology discussion and routine work. > > > > Let's back to the technology discussion. Thanks! > > > > > > > > Thanks > > > > Sandy > > > > > > > > ???????????? > > > > *????????????*Xiejingrong(Jingrong) > > > > *????????????*??????00007940; > > > > *????????????*bier-chairs@ietf.org ;bier@ietf.org < > > bier@ietf.org>;bier-ads@ietf.org ; > > draft-xie-bier-ipv6-encapsulation@ietf.org < > > draft-xie-bier-ipv6-encapsulation@ietf.org>; > > > > *??? ??? ???*2020???03???10??? 15:57 > > > > *??? ??? ???RE: Re:Request an adoption call > > ondraft-xie-bier-ipv6-encapsulation-05* > > > > Dear Sandy, > > > > > > > > With all due respect, I am curious whether you speak as individual or WG > > secretary. > > > > > > > > More comments inline. > > > > > > > > Thanks > > > > Jingrong > > > > > > > > *From:*zhang.zheng@zte.com.cn [mailto:zhang.zheng@zte.com.cn > > ] > > *Sent:* Tuesday, March 10, 2020 2:57 PM > > *To:* Xiejingrong (Jingrong) > > *Cc:* bier-chairs@ietf.org; bier@ietf.org; bier-ads@ietf.org; > > draft-xie-bier-ipv6-encapsulation@ietf.org > > *Subject:* Re:Request an adoption call on > > draft-xie-bier-ipv6-encapsulation-05 > > > > > > > > Hi Jingrong, > > > > > > > > I don't think this solution (draft-xie-bier-ipv6-encapsulation) has gotten > > consensus in BIER working group. > > > > [XJR] I think an adoption call is to verify the existence of consensus, > > rather than reverse. > > > > However, there is another BIER IPv6 solution (draft-zhang-bier-bierin6) > > has gotten consensus in the WG. > > > > [XJR] This claim of consensus looks even more strange to me, as you are > > one author of this draft, and also the secretary of BIER WG. I believe only > > WG chairs or AD can declare such consensus. > > > > The latest presentation is in IETF105# and it has been in adoption list. > > > > BTW: I don't think there is straight relationship with BIER and SRv6. > > But draft-zhang-bier-bierin6 works well with SRv6 without any extra > > specification. > > > > > > > > Thanks > > > > Sandy > > > > > > > > > > > > ???????????? > > > > *????????????*Xiejingrong(Jingrong) > > > > *????????????*bier-chairs@ietf.org ; > > > > *????????????*BIER WG ;bier-ads@ietf.org ; > > draft-xie-bier-ipv6-encapsulation@ietf.org < > > draft-xie-bier-ipv6-encapsulation@ietf.org>; > > > > *??? ??? ???*2020???03???10???10:37 > > > > *??? ??? ???RE: Request an adoption call on draft-xie-bier-ipv6-encapsulation-05* > > > > Dear WG Chairs, > > > > > > > > We've just updated a new revision of bier-ipv6-encapsulation. Main updates: > > > > 1. Use the Next Header value 143 for Ethernet packet in IP/IPv6. > > > > 2. Update the ???security consideration??? section. further includes: > > > > 2.1 Explain the BIER domain and BIER sub-domain that may spanning multiple > > ASes operated by a single operator. > > > > 2.2 Simply refer the security considerations of Inter-domain deployment to > > RFC8296, and remove the section 5.2 ???Inter-domain deployment???. > > > > https://datatracker.ietf.org/doc/draft-xie-bier-ipv6-encapsulation/ > > > > https://www.ietf.org/rfcdiff?url2=draft-xie-bier-ipv6-encapsulation-06 > > > > > > > > The first update about Next Header value 143 is based on the significant > > progress of Native IPv6 solution that is happening in industry, below for > > reference: > > > > SRv6 PGM (in its LC) has applied the Proto value 143 for Ethernet packet > > in IP/IPv6: > > > > > > https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/ > > > > > > > > The second update is based on the Tony???s comment before IETF106 about > > security deployment, and suggestion from Dirk recently. > > > > We hope this could address the concerns about security deployment of > > BIERv6, as well as other comments received on IETF106: > > > > https://mailarchive.ietf.org/arch/msg/bier/1DP5hGPrPsiC3OE5skm2yaN6tQM/ > > > > > > > > Again, we believe this draft is stable and ready for adoption, and the > > BIER WG charter item 7 "BIER natively in IPv6" should advance. > > > > Thank you very much for consideration! > > > > > > > > Best Regards, > > > > Jingrong > > > > > > > > > > > > *From:* BIER [mailto:bier-bounces@ietf.org ]*On > > Behalf Of *Xiejingrong (Jingrong) > > *Sent:* Thursday, January 23, 2020 9:27 AM > > *To:* bier-chairs@ietf.org > > *Cc:* BIER WG ;bier-ads@ietf.org; > > draft-xie-bier-ipv6-encapsulation@ietf.org > > *Subject:* [Bier] Request an adoption call on > > draft-xie-bier-ipv6-encapsulation-05 > > > > > > > > Dear WG Chairs: > > > > > > > > We would like to request an adoption call on > > draft-xie-bier-ipv6-encapsulation-05. > > > > We've presented this proposal for about two years and it had led to the > > writing and adoption of draft-ietf-bier-ipv6-requirements. > > > > We've addressed the comments received in the past 2 years. > > > > We've seen lots of interest on the draft. > > > > We believe it is stable and ready for adoption. > > > > We think the charter item 7 "BIER natively in IPv6" should advance. > > > > > > > > Thanks for consideration. > > > > > > > > BTW: > > > > I will be in spring festival for the coming 7 days but I can read the list > > anytime. > > > > Happy spring festival to those who have. > > > > > > > > Jingrong (on behalf of the authors and contributors) > > > > > > > > > > > > > > > > > > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier -- --- tte@cs.fau.de From nobody Wed Mar 11 21:37:14 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3CC1D3A0CED; Wed, 11 Mar 2020 21:37:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.87 X-Spam-Level: X-Spam-Status: No, score=-0.87 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eRSmesyYFkE2; Wed, 11 Mar 2020 21:37:10 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E2BC83A0D5C; Wed, 11 Mar 2020 21:37:08 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id B49B2548049; Thu, 12 Mar 2020 05:37:03 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id AC08F440040; Thu, 12 Mar 2020 05:37:03 +0100 (CET) Date: Thu, 12 Mar 2020 05:37:03 +0100 From: Toerless Eckert To: Tony Przygienda Cc: BIER WG , iana@iana.org, bier-ads@ietf.org, BIER WG Chairs Message-ID: <20200312043703.GE2331@faui48f.informatik.uni-erlangen.de> References: <20200311225102.GB2331@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] Ethertype for non-MPLS BIER suggestion X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 04:37:12 -0000 I never finalized getting ethertypes from IEEE myself yet, so not sure about the processes. Would be nice if IANA or some other designated entity could take ownership of these assignments, right now the 8 ethertypes mentioning drafts which are all RFCs now are all over the place. "TRILL WG", routing-area or even "Cisco" (SFC/NSH). On Wed, Mar 11, 2020 at 09:01:39PM -0700, Tony Przygienda wrote: > oh, I see. no idea what the proper "update" procedure in IEEE is. Someone > feels like ferreting that out? > > > On Wed, Mar 11, 2020 at 9:00 PM Tony Przygienda wrote: > > > I'm surprised, there was an official liaison and assignment from IEEE of > > the ethertype. Alia handled it while I remember having filed _the_ forms > > ;-) for her ... > > > > --- tony > > > > On Wed, Mar 11, 2020 at 3:51 PM Toerless Eckert wrote: > > > >> Dear IANA, BIER leadership > >> > >> Not sure what normal IANA procedures are (or for that matter IEEE > >> procedures), > >> but: > >> > >> I would appreciate if there was an attempt made to update the following > >> record with IEEE: > >> > >> http://standards-oui.ieee.org/ethertype/eth.txt > >> > >> > >> AB37 IETF Routing Area Please read > >> draft-ietf-bier-mpls-encapsulation-12 at > >> 5177 Brandin Court > >> https://datatracker.ietf.org/doc/draft-ietf-bier-mpls-encapsulation/. > >> > >> Fremont CA 94538 > >> > >> US > >> > >> Aka: Ask IEEE to change explanatory text to rfc8296 > >> > >> And for that matter, maybe IANA could check the other 7 entries of > >> "draft-ietf" in that registry, and get them updated accordingly. > >> > >> Cheers > >> Toerless > >> > >> P.S.: Great to see Routing Area has a physical mailbox address at the > >> LLC. Is that the right way to send snail mail to our AD's ? (don't > >> answer, just kidding). > >> > > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier -- --- tte@cs.fau.de From nobody Thu Mar 12 04:12:17 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 765AA3A0CBD for ; Thu, 12 Mar 2020 04:12:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.362 X-Spam-Level: X-Spam-Status: No, score=-3.362 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_MSPIKE_H2=-1.463, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (768-bit key) header.d=labn.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JhY1zQGT0Ur0 for ; Thu, 12 Mar 2020 04:12:14 -0700 (PDT) Received: from gproxy10-pub.mail.unifiedlayer.com (gproxy10-pub.mail.unifiedlayer.com [69.89.20.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BE2C23A09C2 for ; Thu, 12 Mar 2020 04:12:03 -0700 (PDT) Received: from cmgw14.unifiedlayer.com (unknown [10.9.0.14]) by gproxy10.mail.unifiedlayer.com (Postfix) with ESMTP id 98465140EF6 for ; Thu, 12 Mar 2020 05:11:59 -0600 (MDT) Received: from box313.bluehost.com ([69.89.31.113]) by cmsmtp with ESMTP id CLktjeASxKxvrCLktjiOXS; Thu, 12 Mar 2020 05:11:59 -0600 X-Authority-Reason: nr=8 X-Authority-Analysis: v=2.3 cv=AuLAIt1P c=1 sm=1 tr=0 a=h1BC+oY+fLhyFmnTBx92Jg==:117 a=h1BC+oY+fLhyFmnTBx92Jg==:17 a=dLZJa+xiwSxG16/P+YVxDGlgEgI=:19 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=IkcTkHD0fZMA:10:nop_charset_1 a=SS2py6AdgQ4A:10:nop_rcvd_month_year a=Vy_oeq2dmq0A:10:endurance_base64_authed_username_1 a=48vgC7mUAAAA:8 a=8gKY0rPA66xKesImq74A:9 a=QEXdDO2ut3YA:10:nop_charset_2 a=w1C3t2QeGrPiZgrLijVG:22 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=labn.net; s=default; h=Content-Transfer-Encoding:Content-Type:MIME-Version:Subject: References:In-Reply-To:Message-ID:Date:CC:To:From:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=INeRcvx5xrQKlK/UFyz+7dN7fImEf3CUHeapoOHrDPI=; b=c4gt00KIhKAtQigq3aQ5h3PLpA ifTz0GicpdeFDak7mnsitCSNfUxRVHSe2ApGkCXEAH6RsrXO5V8ehqp8759IUDAvUtZFoBtW3Ilil gfDiMhRSGLvj0QU6xienw+Hgh; Received: from pool-72-66-11-201.washdc.fios.verizon.net ([72.66.11.201]:41386 helo=[11.5.0.140]) by box313.bluehost.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.92) (envelope-from ) id 1jCLkt-002WPg-6h; Thu, 12 Mar 2020 05:11:59 -0600 From: Lou Berger To: Toerless Eckert CC: , Date: Thu, 12 Mar 2020 07:11:57 -0400 Message-ID: <170ce719c48.277b.9b4188e636579690ba6c69f2c8a0f1fd@labn.net> In-Reply-To: <20200312010431.GC2331@faui48f.informatik.uni-erlangen.de> References: <20200311221257.GA2331@faui48f.informatik.uni-erlangen.de> <44e81602-21fe-5efe-7ea1-d76345a1fcff@labn.net> <20200312010431.GC2331@faui48f.informatik.uni-erlangen.de> User-Agent: AquaMail/1.22.0-1511 (build: 102200004) MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="UTF-8" Content-Transfer-Encoding: 8bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - box313.bluehost.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - labn.net X-BWhitelist: no X-Source-IP: 72.66.11.201 X-Source-L: No X-Exim-ID: 1jCLkt-002WPg-6h X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: pool-72-66-11-201.washdc.fios.verizon.net ([11.5.0.140]) [72.66.11.201]:41386 X-Source-Auth: lberger@labn.net X-Email-Count: 7 X-Source-Cap: bGFibm1vYmk7bGFibm1vYmk7Ym94MzEzLmJsdWVob3N0LmNvbQ== X-Local-Domain: yes Archived-At: Subject: Re: [Bier] BIER-TE -07 uploaded (was: Re: Pls "vote" on name (draft-ietf-bier-te-arch)) X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 11:12:16 -0000 Stay tuned, I'll try to send the text over the weekend, but it may be next week.... ---------- On March 11, 2020 9:05:08 PM Toerless Eckert wrote: > On Wed, Mar 11, 2020 at 07:42:31PM -0400, Lou Berger wrote: >> >> On 3/11/2020 6:12 PM, Toerless Eckert wrote: >> > I had hoped to receive a followup from Lou re. his suggestion for >> > additional text about "Traffic Engineering". >> >> Sorry I didn't see any message seriously asking for input into the document, >> public or private or otherwise.  > > https://mailarchive.ietf.org/arch/msg/bier/5SMrtPDgBo861DVf4ZcstXL1b78/ > https://mailarchive.ietf.org/arch/msg/bier/lNsrv3d28gHiOPSnVe9TpLUM_z4/ > PM March 5th "Subject: Lou: Re: [Bier] Pls "vote" on name > (draft-ietf-bier-te-arch)" > >> As I stated previously, I'm happy to >> provide such. I'll try to produce it over the weekend, but it may be into >> next week.  Things are a bit busy for the moment -- I haven't even been able >> to keep up on the IETF list entertainment! > > As i said in my mails, i am completely unclear as to what you would > want to write, and its not clear to me either why it better would go > into this document than into the planned TEAS framework document. > > Would be happy to also have a quick voice call if you prefer that. > > Cheers > Toerless > From nobody Thu Mar 12 06:20:01 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 43C553A07EF for ; Thu, 12 Mar 2020 06:19:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jZLT9Y41GT_T for ; Thu, 12 Mar 2020 06:19:54 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 478853A07C6 for ; Thu, 12 Mar 2020 06:19:40 -0700 (PDT) Received: from lhreml706-cah.china.huawei.com (unknown [172.18.7.106]) by Forcepoint Email with ESMTP id B865EB18B1D93619BECA; Thu, 12 Mar 2020 13:19:37 +0000 (GMT) Received: from nkgeml706-chm.china.huawei.com (10.98.57.153) by lhreml706-cah.china.huawei.com (10.201.108.47) with Microsoft SMTP Server (TLS) id 14.3.408.0; Thu, 12 Mar 2020 13:19:37 +0000 Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by nkgeml706-chm.china.huawei.com (10.98.57.153) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Thu, 12 Mar 2020 21:19:34 +0800 Received: from nkgeml705-chm.china.huawei.com ([10.98.57.154]) by nkgeml705-chm.china.huawei.com ([10.98.57.154]) with mapi id 15.01.1713.004; Thu, 12 Mar 2020 21:19:34 +0800 From: "Xiejingrong (Jingrong)" To: Toerless Eckert , "bier@ietf.org" Thread-Topic: [Bier] comments for draft-xie-bier-ipv6-encapsulation-05.txt Thread-Index: AQHV+CYj/aD+q7wLvECqLeo9yIrgTKhE7cYQ Date: Thu, 12 Mar 2020 13:19:34 +0000 Message-ID: References: <20200312042340.GA11877@faui48f.informatik.uni-erlangen.de> In-Reply-To: <20200312042340.GA11877@faui48f.informatik.uni-erlangen.de> Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.202.118] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Bier] comments for draft-xie-bier-ipv6-encapsulation-05.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 13:19:59 -0000 Hi Toerless, Really appreciate for your thorough comments so far! I will answer these comments carefully one by one in the following few days= . >> Running out of time for now, hopefully can catch up with rest later. Please do go ahead for the rest when you find time.=20 Look forward to that part of comments too ! Best Regards, Jingrong -----Original Message----- From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Toerless Eckert Sent: Thursday, March 12, 2020 12:24 PM To: bier@ietf.org Subject: [Bier] comments for draft-xie-bier-ipv6-encapsulation-05.txt Comments on subject document inline. Thanks a lot for the work. From nobody Thu Mar 12 07:10:34 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 44D0F3A0A24 for ; Thu, 12 Mar 2020 07:10:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bgPqtNQzW9ex for ; Thu, 12 Mar 2020 07:10:05 -0700 (PDT) Received: from mxhk.zte.com.cn (mxhk.zte.com.cn [63.217.80.70]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A3F2A3A09DE for ; Thu, 12 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<20200312042429.GA12383@faui48f.informatik.uni-erlangen.de> From: Tony Przygienda Date: Thu, 12 Mar 2020 08:55:47 -0700 Message-ID: To: Toerless Eckert Cc: BIER WG Content-Type: multipart/alternative; boundary="0000000000006e7c7705a0aa68fb" Archived-At: Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 15:57:24 -0000 --0000000000006e7c7705a0aa68fb Content-Type: text/plain; charset="UTF-8" > > > If the neighbor is directly connected, The destination address in > > IPv6 header SHOULD be the neighbor's link-local address on this > > router's outgoing interface, the source destination address SHOULD be > > this router's link-local address on the outgoing interface, and the > > IPv6 TTL MUST be set to 1. > > I've started a thread on 6man/6ops re. link-local-tunnel traffic as i > have the same also in my ANIMA draft, and in implementations i have > seen quite some issues tunneling traffic HW accelerated across IPv6 > link-local addresses and TTL=1. > > Would welcome implementers in BIER to chime in if they would see this > as an issue. > > If folks feel supporting this HW accelerated might be more complicated > than non-link-local tunnels, then it might be useful to change the > text to also allow/require support for using the BFR address even for > subnet adjacent BFR. In that case one would not use HL=1, and that > too i have seen to be a problem in HW accelerated forwarding plane: > HL/TTL=1 -> MUST punt (software processing). > really? I'm surprised, actually, LL with TTL=1 for link local is an absolutely common case since years for e.g. BFD and other thinks like BGP sessions in many topologies so if a silicon does not support that it's a strange IPv6 silicon. But yes, supporting LL properly in IPv6 is non trivial (spec allows to have e.g. same LL on multiple interfaces in a node). The spec here says SHOULD and not MUST so it's perfectly find using any addresses (one could probably even use BFR prefix but that would lead to ECMP non-deterministic behavior which may or may not be OK depending on deployment). If that needs to be spelled out (albeit it's redundant) I'm not opposed to that. Please cc: bier working group on any discussion you are starting with 6man on the side ... Unless I missed my morning mail input ... --- tony --0000000000006e7c7705a0aa68fb Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


>=C2=A0 =C2=A0 If the neighbor is directly connected, The destination ad= dress in
>=C2=A0 =C2=A0 IPv6 header SHOULD be the neighbor's link-local addre= ss on this
>=C2=A0 =C2=A0 router's outgoing interface, the source destination a= ddress SHOULD be
>=C2=A0 =C2=A0 this router's link-local address on the outgoing inte= rface, and the
>=C2=A0 =C2=A0 IPv6 TTL MUST be set to 1.

I've started a thread on 6man/6ops re. link-local-tunnel traffic as i have the same also in my ANIMA draft, and in implementations i have
seen quite some issues tunneling traffic HW accelerated across IPv6
link-local addresses and TTL=3D1.

Would welcome implementers in BIER to chime in if they would see this
as an issue.

If folks feel supporting this HW accelerated might be more complicated
than non-link-local tunnels, then it might be useful to change the
text to also allow/require support for using the BFR address even for
subnet adjacent BFR. In that case one would not use HL=3D1, and that
too i have seen to be a problem in HW accelerated forwarding plane:
HL/TTL=3D1 -> MUST punt (software processing).

=
really? I'm surprised, actually, LL with TTL=3D1 for link lo= cal is an absolutely common case since years for e.g. BFD and other thinks = like BGP sessions in many topologies so if a silicon does not support that = it's a strange IPv6 silicon. But yes, supporting LL properly in IPv6 is= non trivial (spec allows to have e.g. same LL on multiple interfaces in a = node). The spec here says SHOULD and not MUST so it's perfectly find us= ing any addresses (one could probably even use BFR prefix but that would le= ad to ECMP non-deterministic behavior which may or may not be OK depending = on deployment).=C2=A0 If that needs to be spelled out (albeit it's redu= ndant) I'm not opposed to that.

Please cc= : bier working group on any discussion you are starting with 6man on the si= de ... Unless I missed my morning mail input ...

<= div>--- tony




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Date: Thu, 12 Mar 2020 11:22:08 -0700 Message-ID: To: "Nagendra Kumar Nainar (naikumar)" Cc: Toerless Eckert , BIER WG Content-Type: multipart/alternative; boundary="000000000000e4a16805a0ac7339" Archived-At: Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 18:23:45 -0000 --000000000000e4a16805a0ac7339 Content-Type: text/plain; charset="UTF-8" Nagendra, IP-FRR is an interesting observation. There is no reason why LL cannot be protected by another non-LL nexthop but it may not be as natural as otherwise. As I said, no problem in softenting the draft from SHOULD to something else as long we allow both LL and non-LL addressing. The driver to LL & NHOP=1 was mainly to have people misunderstand that BIER can be forwarded all over the place by default which will lead to a valley of tears long term albeit it looks like a great idea first. BIER is a switching fabric technology @ L2.5 and not an overlay (and yes, it can be used that way but this is IMO jsut as far from BIER as BESS is from idr ;-) --- tony On Thu, Mar 12, 2020 at 9:30 AM Nagendra Kumar Nainar (naikumar) < naikumar@cisco.com> wrote: > Hi Toerless, > > > > Thank you for triggering the discussion with 6MAN. I was discussing with > the authors offline on the same topic. I think it is better to have a > clarity on this topic. > > > > I personally think it is better to use non LL address even when the BFRs > are directly connected for behavior consistency and to leverage some of the > benefits such as IP-FRR. > > > > Thanks, > > Nagendra > > > > *From: *BIER on behalf of Tony Przygienda < > tonysietf@gmail.com> > *Date: *Thursday, March 12, 2020 at 11:58 AM > *To: *Toerless Eckert > *Cc: *BIER WG > *Subject: *Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt > > > > > > > > If the neighbor is directly connected, The destination address in > > IPv6 header SHOULD be the neighbor's link-local address on this > > router's outgoing interface, the source destination address SHOULD be > > this router's link-local address on the outgoing interface, and the > > IPv6 TTL MUST be set to 1. > > I've started a thread on 6man/6ops re. link-local-tunnel traffic as i > have the same also in my ANIMA draft, and in implementations i have > seen quite some issues tunneling traffic HW accelerated across IPv6 > link-local addresses and TTL=1. > > Would welcome implementers in BIER to chime in if they would see this > as an issue. > > If folks feel supporting this HW accelerated might be more complicated > than non-link-local tunnels, then it might be useful to change the > text to also allow/require support for using the BFR address even for > subnet adjacent BFR. In that case one would not use HL=1, and that > too i have seen to be a problem in HW accelerated forwarding plane: > HL/TTL=1 -> MUST punt (software processing). > > > > really? I'm surprised, actually, LL with TTL=1 for link local is an > absolutely common case since years for e.g. BFD and other thinks like BGP > sessions in many topologies so if a silicon does not support that it's a > strange IPv6 silicon. But yes, supporting LL properly in IPv6 is non > trivial (spec allows to have e.g. same LL on multiple interfaces in a > node). The spec here says SHOULD and not MUST so it's perfectly find using > any addresses (one could probably even use BFR prefix but that would lead > to ECMP non-deterministic behavior which may or may not be OK depending on > deployment). If that needs to be spelled out (albeit it's redundant) I'm > not opposed to that. > > > > Please cc: bier working group on any discussion you are starting with 6man > on the side ... Unless I missed my morning mail input ... > > > > --- tony > > > > > > > > > --000000000000e4a16805a0ac7339 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Nagendra, IP-FRR is an interesting observation. There= is no reason why LL cannot be protected by another non-LL nexthop but it m= ay not be as natural as otherwise.

As I said,= no problem in softenting the draft from SHOULD to something else as long w= e allow both LL and non-LL addressing. The driver to LL & NHOP=3D1 was = mainly to have people misunderstand that BIER can be forwarded all over the= place by default which will lead to a valley of tears long term albeit it = looks like a great idea first. BIER is a switching fabric technology @ L2.5= and not an overlay (and yes, it can be used that way but this is IMO jsut = as far from BIER as BESS is from idr ;-)

--- = tony

On Thu, Mar 12, 2020 at 9:30 AM Nagendra Kumar Nainar (naik= umar) <naikumar@cisco.com> = wrote:

Hi Toerless,

=C2=A0

Thank you for triggering the discussion with 6MAN. I= was discussing with the authors offline on the same topic. I think it is b= etter to have a clarity on this topic.

=C2=A0

I personally think it is better to use non LL addres= s even when the BFRs are directly connected for behavior consistency and to= leverage some of the benefits such as IP-FRR.

=C2=A0

Thanks,

Nagendra

=C2=A0

From: = BIER <bier-bounces@ietf.org>= ; on behalf of Tony Przygienda <tonysietf@gmail.com>
Date: Thursday, March 12, 2020 at 11:58 AM
To: Toerless Eckert <tte@cs.fau.de>
Cc: BIER WG <b= ier@ietf.org>
Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt<= /u>

=C2=A0

=C2=A0


>=C2=A0 =C2=A0 If the neighbor is directly connected, The destination ad= dress in
>=C2=A0 =C2=A0 IPv6 header SHOULD be the neighbor's link-local addre= ss on this
>=C2=A0 =C2=A0 router's outgoing interface, the source destination a= ddress SHOULD be
>=C2=A0 =C2=A0 this router's link-local address on the outgoing inte= rface, and the
>=C2=A0 =C2=A0 IPv6 TTL MUST be set to 1.

I've started a thread on 6man/6ops re. link-local-tunnel traffic as i have the same also in my ANIMA draft, and in implementations i have
seen quite some issues tunneling traffic HW accelerated across IPv6
link-local addresses and TTL=3D1.

Would welcome implementers in BIER to chime in if they would see this
as an issue.

If folks feel supporting this HW accelerated might be more complicated
than non-link-local tunnels, then it might be useful to change the
text to also allow/require support for using the BFR address even for
subnet adjacent BFR. In that case one would not use HL=3D1, and that
too i have seen to be a problem in HW accelerated forwarding plane:
HL/TTL=3D1 -> MUST punt (software processing).

=C2=A0

really? I'm surprised, actually, LL with TTL=3D1= for link local is an absolutely common case since years for e.g. BFD and o= ther thinks like BGP sessions in many topologies so if a silicon does not s= upport that it's a strange IPv6 silicon. But yes, supporting LL properly in IPv6 is non trivial (spec allows to hav= e e.g. same LL on multiple interfaces in a node). The spec here says SHOULD= and not MUST so it's perfectly find using any addresses (one could pro= bably even use BFR prefix but that would lead to ECMP non-deterministic behavior which may or may not be OK dependi= ng on deployment).=C2=A0 If that needs to be spelled out (albeit it's r= edundant) I'm not opposed to that.

=C2=A0

Please cc: bier working group on any discussion you = are starting with 6man on the side ... Unless I missed my morning mail inpu= t ...

=C2=A0

--- tony

=C2=A0

=C2=A0

=C2=A0

=C2=A0

--000000000000e4a16805a0ac7339-- From nobody Thu Mar 12 11:49:14 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 490343A0FAF for ; Thu, 12 Mar 2020 11:49:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.87 X-Spam-Level: X-Spam-Status: No, score=-0.87 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id b0-b3japjHpO for ; Thu, 12 Mar 2020 11:49:10 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DEC293A0FAD for ; Thu, 12 Mar 2020 11:49:09 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [131.188.34.52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 96D7854842E; Thu, 12 Mar 2020 19:49:04 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id 8E247440040; Thu, 12 Mar 2020 19:49:04 +0100 (CET) Date: Thu, 12 Mar 2020 19:49:04 +0100 From: Toerless Eckert To: Tony Przygienda Cc: BIER WG Message-ID: <20200312184904.GA17570@faui48f.informatik.uni-erlangen.de> References: <20200312042429.GA12383@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 18:49:12 -0000 On Thu, Mar 12, 2020 at 08:55:47AM -0700, Tony Przygienda wrote: > > If folks feel supporting this HW accelerated might be more complicated > > than non-link-local tunnels, then it might be useful to change the > > text to also allow/require support for using the BFR address even for > > subnet adjacent BFR. In that case one would not use HL=1, and that > > too i have seen to be a problem in HW accelerated forwarding plane: > > HL/TTL=1 -> MUST punt (software processing). > > really? I'm surprised, actually, LL with TTL=1 for link local is an > absolutely common case since years for e.g. BFD and other thinks like BGP > sessions in many topologies so if a silicon does not support that it's a > strange IPv6 silicon. Even BFD is control plane, albeit a special case. I was talking about forwarding plane, HW accelerated. Check out if you can configure any type of tunnel (IPinIP, GRE, IPsec VTI,...) on your router of choice with local and remote tunnel endpoint addresses being link-local and let me know if it not only works but actually does not get punted. And then assign the same LL addresses on multiple interfaces and run a tunnel across each of them. I would bet the CLI might not even allow to enter the addresses correctly as % Last year i was struggling to figure out how to make those link-local tunnels (ANIMA) work in *Swan on linux for IPsec tunnels. Nightmare... (thats not even hardware). This is of course all just lame industry stuff, in a perfect world this shouldn't be a problem, but the real point is that there is (IMHO) really no functional benefit using the link-local addresses. > But yes, supporting LL properly in IPv6 is non > trivial (spec allows to have e.g. same LL on multiple interfaces in a > node). The spec here says SHOULD and not MUST so it's perfectly find using > any addresses (one could probably even use BFR prefix but that would lead > to ECMP non-deterministic behavior which may or may not be OK depending on > deployment). If that needs to be spelled out (albeit it's redundant) I'm > not opposed to that. Tell me why we would not always want to use the global addresses. (Some IPv6 archicture made us think we should use loopback for link-local communications ?) In ANIMA we need to build link-local tunnels in the absence of pre-existing routing for global node addresses. Hence we learned about all the implementation issues. I can't see how BIER is working without the routes to the BIER prefixes, so why not use them as the tunnel addresses to avoid unnecessary real-world problems. Now, if someone comes back and says that the route-lookups for global addresses will result in a less performant implementation than link-locals which do not require another lookup, or anything else of real technical value in support of the link-local addresses, then i would be all in for also including them as an option, but i would maintain my caution, that the MUST support should be on th e safer bet, the global addresses. > Please cc: bier working group on any discussion you are starting with 6man > on the side ... Unless I missed my morning mail input ... Isn't there a policy that one should be beaten up if doing too much cross-posting ? Toerless > --- tony -- --- tte@cs.fau.de From nobody Thu Mar 12 12:02:46 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 459753A1042 for ; Thu, 12 Mar 2020 12:02:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.651 X-Spam-Level: X-Spam-Status: No, score=-1.651 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mFhRBYK70u3U for ; Thu, 12 Mar 2020 12:02:35 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 60DE73A109E for ; Thu, 12 Mar 2020 12:02:35 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 7883C54842E; Thu, 12 Mar 2020 20:02:30 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id 6B01D440040; Thu, 12 Mar 2020 20:02:30 +0100 (CET) Date: Thu, 12 Mar 2020 20:02:30 +0100 From: Toerless Eckert To: Tony Przygienda Cc: "Nagendra Kumar Nainar (naikumar)" , BIER WG Message-ID: <20200312190230.GB17570@faui48f.informatik.uni-erlangen.de> References: <20200312042429.GA12383@faui48f.informatik.uni-erlangen.de> <00788CA2-6F96-4AC5-BEB5-218C94AEC456@cisco.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 19:02:45 -0000 On Thu, Mar 12, 2020 at 11:22:08AM -0700, Tony Przygienda wrote: > Nagendra, IP-FRR is an interesting observation. There is no reason why LL > cannot be protected by another non-LL nexthop but it may not be as natural > as otherwise. > > As I said, no problem in softenting the draft from SHOULD to something else > as long we allow both LL and non-LL addressing. > The driver to LL & NHOP=1 > was mainly to have people misunderstand that BIER can be forwarded all over > the place by default which will lead to a valley of tears long term albeit > it looks like a great idea first. parsing failed. Can you plsease rephrase ? > BIER is a switching fabric technology @ > L2.5 and not an overlay (and yes, it can be used that way but this is IMO > jsut as far from BIER as BESS is from idr ;-) See my other discuss point about the IMHO most 'useful' modes of deployment/forwarding. Those would be good to discuss in the drafts. Partial or full deployment of BIER with IPv6 encap: BIFR-to-BFER IPv6 encapsulated, per-BIER-hop rewrite of IPv6 header No differnce between partial or full deployment, should work automatically calculating remote next-hop in partial. Partial L2 BIER encap support Recommend not to use, but use IPv6 encap, as IPv6 encap/decap might more likely be impacting performance. Full L2 BIER encap support determined by BFIR from IGP info, then ue L2 encap. Cheers Toerless From nobody Thu Mar 12 12:24:50 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2020B3A03EF for ; Thu, 12 Mar 2020 12:24:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id v-JKWKLQS7gA for ; Thu, 12 Mar 2020 12:24:47 -0700 (PDT) Received: from mail-io1-xd34.google.com (mail-io1-xd34.google.com [IPv6:2607:f8b0:4864:20::d34]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3607B3A0363 for ; Thu, 12 Mar 2020 12:24:47 -0700 (PDT) Received: by mail-io1-xd34.google.com with SMTP id k4so6911119ior.4 for ; Thu, 12 Mar 2020 12:24:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=G2Fuv+wLijOZkBILHqf63lAvRQZfntzSzLEzbizr20Q=; b=WdLD4tThC0p9xzaTYUZqenpsA8a8aH0cPxr4nssfGbijHd0j3wpaR18laFc3aB6XMS vIHuiVHkr1QzKtisoKKeBllB+QOT/3cHmBGw6ZA0o4k4QDr/wPSSF98QOcjM//WWy0NX 7IRx11W06V2nPYnOY8zyCjGiZPj/lc3G/tVsfxwbOBUMfA4IE3vDmqGPFLONvXNM8Ml1 VQ6UZcHHqC2ZiDjNoJ1cxklNby5KEtdF94T0u5xLorUa+KMKsXlCwnWnyyPPfHTwr+kj Nx8AzmNtIeTfkGLNS6iykqf3DkwPnL2CMchUCmzbCK0sBlFbxk5qXlLxlMQE/FkbGDOt EIiQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=G2Fuv+wLijOZkBILHqf63lAvRQZfntzSzLEzbizr20Q=; b=cgPYq3TGlFGKlIZyKBgV4T8/q7wHb6awEQ7KF5hvbO8tJN5VdziR1pauN9x2genGWn ajKwe2ELU7jrIaQdZzlPB/YCo92x6lwl+8suAJAUMbvL+k9Lh2cDwys9hXfg9gr2R1Py +umYGBxuV6c3JmFaVNqmfeyLczwu0747ZIsuPDGJDWDDAuWlqj2s5GU8/aNY5qKZ57jE cW+kFzliGMtCZ+WTm1KRE9vLNzWLirfQGo37D/TNh/HEHSzFV/Hd1WTgXMI+UHVzkn65 5SgrEiGjcuB4a0Lj1PdNn6WV7AyVco2BFyTp5i+G0MToCVXBhGGVzDTtznYM0m0ZF860 7Dlg== X-Gm-Message-State: ANhLgQ2sQB6oQ1/A6MLexMapD+4ksyto186+eaot2tK/K2Ujn9Jmdn/C 4TSVhEDyYnkeIc4+c5NZoiJiOpsTioGS6Qw/KxI= X-Google-Smtp-Source: ADFU+vtekZf7YUP3d/p8KXrflCAhhDxRdmXVI12aVrsnFIepIVGths4SsyHvLjUAdbRZm5oGAuEx/gLXDG/VIVdnPog= X-Received: by 2002:a02:dc6:: with SMTP id 189mr8039146jax.100.1584041086323; Thu, 12 Mar 2020 12:24:46 -0700 (PDT) MIME-Version: 1.0 References: <20200312042429.GA12383@faui48f.informatik.uni-erlangen.de> <00788CA2-6F96-4AC5-BEB5-218C94AEC456@cisco.com> <20200312190230.GB17570@faui48f.informatik.uni-erlangen.de> In-Reply-To: <20200312190230.GB17570@faui48f.informatik.uni-erlangen.de> From: Tony Przygienda Date: Thu, 12 Mar 2020 12:23:13 -0700 Message-ID: To: Toerless Eckert Cc: "Nagendra Kumar Nainar (naikumar)" , BIER WG Content-Type: multipart/alternative; boundary="00000000000042928605a0ad4e01" Archived-At: Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 19:24:49 -0000 --00000000000042928605a0ad4e01 Content-Type: text/plain; charset="UTF-8" On Thu, Mar 12, 2020 at 12:02 PM Toerless Eckert wrote: > On Thu, Mar 12, 2020 at 11:22:08AM -0700, Tony Przygienda wrote: > > Nagendra, IP-FRR is an interesting observation. There is no reason why LL > > cannot be protected by another non-LL nexthop but it may not be as > natural > > as otherwise. > > > > As I said, no problem in softenting the draft from SHOULD to something > else > > as long we allow both LL and non-LL addressing. > > > The driver to LL & NHOP=1 > > was mainly to have people misunderstand that BIER can be forwarded all > over > > the place by default which will lead to a valley of tears long term > albeit > > it looks like a great idea first. > > parsing failed. Can you plsease rephrase ? > OK, if you use LL and TTL=1 you basically won't manage to send to wrong link or more than one hop so it forces a link-by-link L2.5 fabric which is BIER architecture day one on standard RFC (+ exception allowed to _bypass non-BIER supporting nodes_). As I said, the spec is NOT MUST and should not be. We can discuss out whether we should bput "SHOULD" with BIER prefix (I'm kind of leery of v6 global addressing since that's not always given) but then we need to talk how we deal with parallel links (or maybe we don't have to given BIER only addresses whole BFR with a bit, I kind of didn't do enough careful thinking here yet). > > > BIER is a switching fabric technology @ > > L2.5 and not an overlay (and yes, it can be used that way but this is IMO > > jsut as far from BIER as BESS is from idr ;-) > > See my other discuss point about the IMHO most 'useful' modes of > deployment/forwarding. Those would be good to discuss in the drafts. > > Partial or full deployment of BIER with IPv6 encap: > BIFR-to-BFER IPv6 encapsulated, per-BIER-hop rewrite of IPv6 header > No differnce between partial or full deployment, > should work automatically calculating remote next-hop in partial. > There is somehow a huge misconception that as intermediate node you can "rewrite headers and options on v6 while keeping the source address"in flight and "adresses can encode my uncle's birthday" because "some people said so now" but the ultimately governing body are v6 working groups not us. In fact, AFAIR v6 specs you can't, almost without exceptions (see the raging discussions on SRv6 PHP, SRv6 basically breaking the "no v6 address has semantics behind subnetting", mucking around with options they have no business to muck with and so on). BIER LL, TTL=1 is one hop forwarding where v6 is acting as L2 basically and not some end-2-end forwarding transport with semantics encoding. If you start to shove BIER frames around tunnels to show up in arbitrary places it's like shoving MPLS frames to weird places and expect "labels to work". A BIER bitmask is basically a very weird label with really only local significance on the link and not using it correctly will make you expose BIER mask in places where they do the wrong stuff (just like MPLS labels). Yes, bypassing non-supporting nodes is ok if we control the semantics of that tightly but everything else is basically brfeaking the architecture with a long tail fallout. BIER is carefully thought out and reviewed and lots of stuff has security/OAM/etc implications and that's what the WG is chartered to govern and not come up with some "fashionable hacks" with the acronyms du jour. And yes, you can use BIER "in overlay" but that is not the current charter of BIER WG as many other things are not. Or that would be a "BIER-BESS" group I guess ... And yes, "it's lame industry stuff" you're quoting, we have v6 standards track documents signed of and 6man to govern all that stuff and arguments along the lines "but my silicon doesn't do that" or "this implementation is lousy" I'm sympathetic to but to quote Yakov here "I cannot prevent you doing whatever you want to do in your privacy with the spec I'm publishing but do not ask me to standardize your stuff if it does not follow the governing architecture and needs interoperability". And yes, please cross-post, I don't want 6man or spring to be led down some garden path without being plugged in into the BIER working group where the BIER technology is governed. --- tony --00000000000042928605a0ad4e01 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable --00000000000063b25105a112a7bc-- From nobody Wed Mar 18 09:33:41 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7B78B3A182C for ; Wed, 18 Mar 2020 09:33:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.87 X-Spam-Level: X-Spam-Status: No, score=-0.87 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KoO0efir7sUq for ; Wed, 18 Mar 2020 09:33:35 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B44F43A07D3 for ; Wed, 18 Mar 2020 09:33:30 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [131.188.34.52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 18FC8548048; Wed, 18 Mar 2020 17:33:25 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id 0C2F0440040; Wed, 18 Mar 2020 17:33:25 +0100 (CET) Date: Wed, 18 Mar 2020 17:33:25 +0100 From: Toerless Eckert To: IJsbrand Wijnands Cc: IJsbrand Wijnands , BIER WG , "Nagendra Kumar Nainar (naikumar)" Message-ID: <20200318163324.GD24215@faui48f.informatik.uni-erlangen.de> References: <20200312042429.GA12383@faui48f.informatik.uni-erlangen.de> <00788CA2-6F96-4AC5-BEB5-218C94AEC456@cisco.com> <20200312190230.GB17570@faui48f.informatik.uni-erlangen.de> <20200312202909.GC17570@faui48f.informatik.uni-erlangen.de> <20200317163800.GA15016@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Mar 2020 16:33:38 -0000 Ice, On Tue, Mar 17, 2020 at 08:37:36PM +0100, IJsbrand Wijnands wrote: > Toerless, > > > would be easier to support longer bitstrings as needed. And the length > > of bitstrings is not nailed in stone forever like in IPv6, so > > different markets could evolve to support different (longer) length. > > That is true, by overloading the IPv6 address the BM is fixed, but, it is way in front of the packet, so easy accessible for HW, so there will be a trade-off between more bits vs. performance penalty for longer masks. Longer masks will not come for free. It is quite annoying, that we have no good agreed upon "standards" for expected acceptable packet header processing expectations. Such as depth into the packet that lookups are e.g.: "cheap"... "acceptable" ..."impossible" Quite jealous of the IoT space, where e.g.: rfc7228 exists. In terms of packet processing, high-speed devices are even more "constrained", yet we have never attempted to classify those constraints better publically. I foronce am going on the assumption, that within 10 year time frame, 256 byte lookahead for header processing is standard if we push for it. And 128 is standard now. > > the long-term benefit deteriorates as soon as someone does write > > a BIER SDK for linux and windows. And with that context in mind i > > found the long-term limitation of not being able to grow bitstrings > > in various markets to be too limiting. > > We probably need to define what you consider short-term vs. long-term. Getting IGMPv3 supported in the host stack only took 10 years, is that long or short term? IGMPv3 is yet another soap-box for me. We should have from day 1 put that signaling on top of UDP to eliminate the slowest-link in the dependency chain, the operating system vendors. I would call 10 years mid-term, aka: we will see 2nd generation of implementations in dynamic parts of the market, where there is growth, and thats where i would hope to see longer masks becoming adopted, but in segments where there is no big market pickup, there would be just proliferation of unchanged minimum-to-implement functionality from the first generation. Cheers Toerless > Thx, > > Ice. > > > > > Cheers > > Toerless > > > >> > >> Thx, > >> > >> Ice. > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier From nobody Sun Mar 22 20:23:12 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EC57B3A03FC; Sun, 22 Mar 2020 20:22:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CZGiV-HRx1bh; Sun, 22 Mar 2020 20:22:48 -0700 (PDT) Received: from mail-io1-xd32.google.com (mail-io1-xd32.google.com [IPv6:2607:f8b0:4864:20::d32]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 76E993A011D; Sun, 22 Mar 2020 20:22:48 -0700 (PDT) Received: by mail-io1-xd32.google.com with SMTP id q9so12707705iod.4; Sun, 22 Mar 2020 20:22:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=6CQdfpKC+QmvgLOnw8Bs8R6eghJ0yW+Zv9f8O/BHsKY=; b=Y5jGYzargKZR9OpE1HnsrvmCaW8i4M5ws6YqIqzkkQmD7PmRKezSUy/bx31yJzRW/2 kEkRtbxzB+Z0wb5aMnW3HiCIWeJDC3rXGKmrqqjSv3blX+UaC/eXxxyoUc5cng1NABxN dLImZ2piG1NnNDSeJGXszRqNh2mLLLfRoijiOrmzYxE8PPsgcdC5KaNOpzO1BebjEzkq +JGxoU+9HJ8b0fZvpL3N2Z5e9jF54Kmn+X8vRV5A99+arHDvnlXS38BK9vLWMEl9MOBl B/tJiCn7VvnSj5rk6DME/qFV0PdGHtCqpE55NVGsqfZoZe9m8va0NHzg2Qd5qRv3L+HH +Qvw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=6CQdfpKC+QmvgLOnw8Bs8R6eghJ0yW+Zv9f8O/BHsKY=; b=Qb9eGM9UzWxYf3MOf7ScrOPpt8LRtMDEyUIWQaOb/PPkCYQql0RvZU21V1FCbKg1W7 7S6Mk6eIRQmolCeZVaYTxYSDJig4wwWdTGAbT7eDRQl1eO5AeWEpysF8F7OgPEqizO/L doyqoRVv3zNp6WGZC+Og7bqY3MmM5SOutGmWQK8lIg12KV36p8BX7aS/02rMgzmFriXZ 5ElZC3/lvCcvD7Lx3Yv4l7d/dZndk+/QVVqmbEHwU+gx+Axmqx/jY3+OdQ24Rtsscju+ v5tTOxJP4Oqo1eBIPsm+1swfY83HpyYvJU8BFFGK/5y2xRiV3fxbWbylmnMJoqiZ3PuS A6zw== X-Gm-Message-State: ANhLgQ0Ze4x/nCBM8UfX/sQi/Wa9uMyxz7TtPUXQMp67fSkOSLnOAmk9 q1ZF4pvcW5B1jAvRh9vlnTUOt0pRUBTgnvZmQo0= X-Google-Smtp-Source: ADFU+vvYv8yK8cdS9Zw+OxlCPasTqEA8DXDuawEe/3mC2mIZOq1QozBpjT0XEDVHoNAm4Fe+yAi+bL0DqDZWVs6LMKc= X-Received: by 2002:a5e:8204:: with SMTP id l4mr17677339iom.31.1584933767329; Sun, 22 Mar 2020 20:22:47 -0700 (PDT) MIME-Version: 1.0 References: <0aaf9a4e017643af85cd246b04d1858c@huawei.com> <202003231114061611017@zte.com.cn> In-Reply-To: <202003231114061611017@zte.com.cn> From: Tony Przygienda Date: Sun, 22 Mar 2020 20:20:59 -0700 Message-ID: To: "zhang.zheng" Cc: gengxuesong@huawei.com, 6MAN <6man@ietf.org>, BIER WG Content-Type: multipart/alternative; boundary="00000000000031b9a305a17d2620" Archived-At: Subject: Re: [Bier] BIER in IPv6 --- draft-zhang-bier-bierin6-04 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Mar 2020 03:23:07 -0000 --00000000000031b9a305a17d2620 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable That's a currently ongoing discussions between the auhtors (cc:'ing bier as well) LL has advantages * the packet cannot "escape" even if it has TTL > 1 * such a scheme can work purely with ND * it's hard to "send out the wrong interface" albeit v6 allows AFAIR to have same link local on multiple interfaces Originally the draft did not even allow for global addressing (since we want to use v6 as L2-substitute here just like MPLS & non-MPLS encapsulations are used in BIER) but this has a nice side effect of allowing to "jump over non-BIER routers" if addressed to bier prefix (which I personally think should be the only allowed global v6 used, otherwise we may end up with BIER frames in funky places and possible "holes" in the replication fabric). Obviously strictly speaking it's not necessary since BIER can be carried in plethora of normal unicast tunnels but bunch of co-auhtors joined and the consensus was to allow it --- tony On Sun, Mar 22, 2020 at 8:15 PM wrote: > Hi Xuesong, > > > Thank you for your question! > > The LL address is used by direct connected neighbor. > > For the neighbor which is not direct connected, the wider range address > should be used. > > > Thanks, > > Sandy > > > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*Gengxuesong(GengXuesong) > *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E5=BC=A0=E5=BE=8100007940;6man@iet= f.org <6man@ietf.org>; > *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8823=E6=97=A5 11:03 > *=E4=B8=BB =E9=A2=98 =EF=BC=9A**RE: Re:BIER in IPv6 --- draft-zhang-bier-= bierin6-04* > > Hi Sandy and authors of draft-zhang-bier-bierin6: > > > > I have some questions about the section 2 when reading the draft. It is > mentioned that: > > =E2=80=9CIf... The destination address in IPv6 header SHOULD be the neigh= bor's > link-local address. > > Otherwise... the destination address SHOULD be the BIER prefix of the BFR > neighbor.=E2=80=9D > > Seems like the draft proposes 2 methods of IPv6 header encapsulation. > > Could these 2 methods be combined ? If not, what's the use case and desig= n > consideration for each method? > > > > Best Regards > > Xuesong > > > > > > > > *From:* ipv6 [mailto:ipv6-bounces@ietf.org]*On Behalf Of * > zhang.zheng@zte.com.cn > *Sent:* Saturday, March 21, 2020 1:43 PM > *To:* 6man@ietf.org > *Subject:* Re:BIER in IPv6 --- draft-zhang-bier-bierin6-04 > > > > Hi, > > As co-author of BIERin6 (draft-zhang-bier-bierin6-04), before you read th= e > draft, please let me introduce BIER technology to you at first: > > BIER technology, as defined in RFC8279, it's a new multicast technology. > The principle is achieving multicast forwarding by hop-by-hop execution. > > BIER is a transport protocol, not just a function. As defined in RFC8296, > BIER has it's own ethernet encapsulation with ethernet type 0xAB37, and > also it can be travelled by MPLS encapsulation. > > BIER has it's own OAM function, ECMP function and traceability. etc. > through BIER header defined in RFC8296. > > > > For travelling through IPv6 only enviroment, we'd like to travel BIER > packet by IPv6 encapsulation. > > In draft-zhang-bier-bierin6-04, we want to just use a new Next Header typ= e > for BIER header carrying. > > We want to bring the minimum impact on IPv6 existed execution, and the > maximum flexibility for header interoperability. > > So if you have any question about draft-zhang-bier-bierin6-04, or about > BIER technology itself, please tell me. I'am glad to explain them to you. > > > > Thanks, > > Sandy > > > > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 > > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*TonyPrzygienda > > *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*Michael McBride ; > > *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*6man@ietf.org <6man@ietf.org>; > > *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8819=E6=97=A5 01:12 > > *=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: BIER in IPv6* > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- > > > > > > The specific ask here is for the 6man to look over both drafts, i.e. > > > > draft-zhang-bier-bierin6 > > > > and > > > > draft-xie-bier-ipv6-encapsulation > > > > and verify whether they conform to published IPv6 standards or raise > objections/concerns. > > > > The requirements document is currently under active work/comments and doe= s > not represent any final or wide-consensus state so an opinion on its stat= e > is appreciated but it should not be used as any final or binding list of > requirements as to the targeted solution in BIER WG > > > > thanks > > > > --- tony > > > > On Tue, Mar 17, 2020 at 9:20 PM Michael McBride < > michael.mcbride@futurewei.com> wrote: > > Hello, > > > > The bier wg could use your ipv6 recommendations. We=E2=80=99ve worked on = various > solutions to transport a bier header in ipv6. We decided to pause and > create a requirements document (draft-ietf-bier-ipv6-requirements) to hel= p > steer us towards the right solution(s). In that drafts appendix we have a > fairly good summary of the various solutions. > > > > We=E2=80=99ve started to rally behind two solutions which meet the majori= ty of the > requirements: draft-xie-bier-ipv6-encapsulation (bier header in ipv6 EH) > and draft-zhang-bier-bierin6 (bier header as payload using ipv6 NH). The > bier chairs today asked to punt the bierv6 topic to 6man for advice befor= e > adopting any of these solutions. > > > > So here we are seeking your advice. The most simple approach would > probably be to give > https://datatracker.ietf.org/doc/draft-ietf-bier-ipv6-requirements/ a > look and scroll down to the appendix to see a summary of the various > solutions we=E2=80=99ve been considering. > > > > thanks! > > mike > > > > > > > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- > > > > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- > --00000000000031b9a305a17d2620 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
That's a currently ongoing discussions between th= e auhtors (cc:'ing bier as well)

LL has advant= ages
* the packet cannot "escape" even if it has TTL &g= t; 1
* such a scheme can work purely with ND
* it's= hard to "send out the wrong interface" albeit v6 allows AFAIR to= have same link local on multiple interfaces

Origi= nally the draft did not even allow for global addressing (since we want to = use v6 as L2-substitute here just like MPLS & non-MPLS encapsulations a= re used in BIER) but this has a nice side effect of allowing to "jump = over non-BIER routers" if addressed to bier prefix (which I personally= think should be the only allowed global v6 used, otherwise we may end up w= ith BIER frames in funky places and possible "holes" in the repli= cation fabric). Obviously strictly speaking it's not necessary since BI= ER can be carried in plethora of normal unicast tunnels=C2=A0 but bunch of = co-auhtors joined and the consensus was to allow it

--- tony



On Sun, Mar 22, 202= 0 at 8:15 PM <zhang.zheng@zte.= com.cn> wrote:

Hi Xuesong,


Thank you for your question!

The LL address is used by direct connected neighbo= r.

For the neighbor which = is not direct connected, the wider range address should be used.


Thanks,

= Sandy


<= div>
=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF= =BC=9AGengxuesong(GengXuesong) <gengxuesong@huawei.com>
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E5=BC=A0=E5=BE=8100007940;6man@ietf.org= <6man@ietf.org&g= t;;
=E6=97=A5 =E6=9C=9F =EF=BC=9A20= 20=E5=B9=B403=E6=9C=8823=E6=97=A5 11:03
=E4=B8=BB = =E9=A2=98 =EF=BC=9ARE: Re:BIER in IPv6 --- draft-zha= ng-bier-bierin6-04

Hi Sandy and authors of draft-zhang-bier-bierin6:

=C2=A0

I have some questions about the section 2 when reading the draf= t. It is mentioned that:

=E2=80= =9CIf... The destination address in IPv6 header SHOULD be the neighbor'= s link-local address.

Otherwis= e... the destination address SHOULD be the BIER prefix of the BFR neighbor.= =E2=80=9D

Seems like the draft = proposes 2 methods of IPv6 header encapsulation.

Could these 2 methods be combined ? If not, what's th= e use case and design consideration for each method?

=C2=A0

Be= st Regards

Xuesong

= =C2=A0

=C2=A0

=C2=A0

From: ipv6 [mai= lto:ipv6-bounces= @ietf.org]On Behalf Of zhang.zheng@zte.com.cn
Sent: Saturday, March 21, 2020 1:43 PM
To: 6man@ietf.org
Subjec= t: Re:BIER in IPv6 --- draft-zhang-bier-bierin6-04

=C2=A0

Hi,

As co-author of BIERin6 (draft-zhang-bier-bierin6-04), befor= e you read the draft, please let me introduce BIER technology to you at fir= st:

BIER technology, as def= ined in RFC8279, it's a new multicast technology. The principle is achi= eving multicast forwarding by hop-by-hop execution.

BIER is a transport protocol, not just a function.= As defined in RFC8296, BIER has it's own ethernet encapsulation with e= thernet type 0xAB37, and also it can be travelled by MPLS encapsulation.=

BIER has it's own OAM fun= ction, ECMP function and traceability. etc. through BIER header defined in = RFC8296.

=C2=A0

For travelling through IPv6 only envir= oment, we'd like to travel BIER packet by IPv6 encapsulation.=

In draft-zhang-bier-bierin6-04, we w= ant to just use a new Next Header type for BIER header carrying.<= /u>

We want to bring the minimum impact o= n IPv6 existed execution, and the maximum flexibility for header interopera= bility.

So if you have any = question about draft-zhang-bier-bierin6-04, or about BIER technology itself= , please tell me. I'am glad to explain them to you.

=C2=A0

Thanks,

Sandy=

=C2=A0

=

=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6<= /u>

=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9ATonyPrzygienda <tonysietf@gmail.com>

=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC= =9AMichael McBride <michael.mcbride= @futurewei.com>;

=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A6man@ietf= .org <6man@ietf.o= rg>;

= =E6=97=A5 =E6=9C=9F =EF=BC=9A2020=E5=B9=B403=E6=9C=8819=E6=97=A5 01:12

=E4=B8= =BB =E9=A2=98 =EF=BC=9ARe: BIER in IPv6<= /strong>

-= -------------------------------------------------------------------
IETF= =C2=A0IPv6=C2=A0working=C2=A0group=C2=A0mailing=C2=A0list
ipv6@ietf.org
Administrative=C2= =A0Requests:=C2=A0https://www.ietf.org/mailman/listinfo/ipv6
---------= -----------------------------------------------------------

<BIER WG = chair hat on>

=C2=A0

= The specific ask here is for the 6man to look over bot= h drafts, i.e.

=C2=A0

draft-zhang-bier-bierin6

<= p class=3D"MsoNormal">=C2=A0

<= div>

and

=C2=A0

draft-xie-bier-ipv6= -encapsulation

=C2=A0

and verify whether they conform to published IPv6 standa= rds or raise objections/concerns.

=C2=A0

The requirements document is currentl= y under active work/comments and does not represent any final or wide-conse= nsus state so an opinion on its state is appreciated but it should not be u= sed as any final or binding list of requirements as to the targeted solution in BIER WG

=C2=A0=

thanks

= =C2=A0

--= - tony

=C2=A0

On Tue, Mar 17, 2020 at 9:20 PM Michael McBride <<= a href=3D"mailto:michael.mcbride@futurewei.com" target=3D"_blank">michael.m= cbride@futurewei.com> wrote:

Hello,

=C2=A0

The bier wg could use your ipv6 r= ecommendations. We=E2=80=99ve worked on various solutions to transport a bi= er header in ipv6. We decided to pause and create a requirements document (draft-ietf-bier-ipv6-requirements) to help steer us towards the = right solution(s). In that drafts appendix we have a fairly good summary of= the various solutions.

=C2=A0

We=E2=80=99ve started to rally behind two solutions which = meet the majority of the requirements: draft-xie-bier-ipv6-encapsulation (b= ier header in ipv6 EH) and draft-zhang-bier-bierin6 (bier header as payload using ipv6 NH). The bier chairs today asked to pun= t the bierv6 topic to 6man for advice before adopting any of these solution= s.

=C2= =A0

So = here we are seeking your advice. The most simple approach would probably be= to give =C2=A0https://datatracker.ietf.org/doc/draf= t-ietf-bier-ipv6-requirements/ a look and scroll down to the appendix to see a summary of the various sol= utions we=E2=80=99ve been considering.

=C2=A0

thanks!

mike

=C2=A0

=C2=A0

=C2=A0=

------------------------------------------------= --------------------
IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative= Requests: https://www.ietf.org/mailman/listinfo/ipv6
----------------= ----------------------------------------------------

=C2=A0


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ipv6@ietf.org
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--00000000000031b9a305a17d2620-- From nobody Sun Mar 22 21:03:59 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 61D703A03F4; Sun, 22 Mar 2020 21:03:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.099 X-Spam-Level: X-Spam-Status: No, score=-2.099 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FRt1NmXCjN4v; Sun, 22 Mar 2020 21:03:55 -0700 (PDT) Received: from mail-pl1-x62c.google.com (mail-pl1-x62c.google.com [IPv6:2607:f8b0:4864:20::62c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5823D3A03F2; Sun, 22 Mar 2020 21:03:55 -0700 (PDT) Received: by mail-pl1-x62c.google.com with SMTP id v23so1303939ply.10; Sun, 22 Mar 2020 21:03:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=7QsqWzicY6Cr0MV8Sh8BG5Sm3AXnBbSXJeiei8tOphM=; b=SfuvZHqvfzIXD2of/y0ZTAZOj7krBk6sJ+JnGQp8DTmoSYxmJLGR5d6g6etzuqq0jY hgsf2ZbnAemWxb4k0Q6E+hfk5+/PV/Ia1W3LjDKcChnImVoRay/IngdPYuM1RXQnUefJ dojXRAkcpSTc2TxljOck/BpPJupmU0/Dhez4e2Fgoq+stagYA6JMTz7bEBbWK4wfntCw 5bTketFjayfmyxK7k22q+euaFgeg37D9DDY0v3hB4EzmgBFMCvkv3syWdwRn8f8KE9nW i3yBL2VGG370/jKF3YPXRQZqyjx3Kj9nF3uD0GsPjyfOAvRUeSt9psWQ85FHVMdjcYv8 W5jg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=7QsqWzicY6Cr0MV8Sh8BG5Sm3AXnBbSXJeiei8tOphM=; b=k+G1rdJzU5Mj2toNHZI6dLZ6AMw2T0vF3snExkSoZTIIsU+REVh+B/D+2W5TcU09px fXDTcJNbV05aVJ6bBDU4YB+FnMAqlnZGMI0eVFGqm1WxGkNV/FwO9trecab8xy47Zt4Y YsQe5a23ZH88oN/+eMiovz8vGnd1lyT6zqokTcxlQSEoKU42QDR5GTB4ZlEm1frPzasF ahq3l1IwEHFW+/YvHiNSrYbMNnBcU+fRPRCUqt1/CpVLkS8FystnXy6NbftrRs/s/V7N NJAyzFU2S88j5YaYOPGoBK0+36QiGy90Mdg4ue5FlSm9y/U6DSb6J7eRb/b6jTPMrZzY hnSQ== X-Gm-Message-State: ANhLgQ2NFkPIaKSlcKsMHH187iIZtWaWHS6lGsP9wCkFjCS9DUgNHYXp LhUYC5SNtcSGdYC2zhBQemOkxq7V X-Google-Smtp-Source: ADFU+vt6DOzI3JUsn06I3V+5EVxhJhXSQJUdrJuqShDjnowYTyqY+CxJ2xUbnSgOr89nrjjHivIacw== X-Received: by 2002:a17:90a:218e:: with SMTP id q14mr22487116pjc.37.1584936234352; Sun, 22 Mar 2020 21:03:54 -0700 (PDT) Received: from [192.168.178.30] ([165.84.25.143]) by smtp.gmail.com with ESMTPSA id 17sm11751157pfu.166.2020.03.22.21.03.51 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 22 Mar 2020 21:03:53 -0700 (PDT) To: Tony Przygienda , "zhang.zheng" Cc: BIER WG , 6MAN <6man@ietf.org> References: <0aaf9a4e017643af85cd246b04d1858c@huawei.com> <202003231114061611017@zte.com.cn> From: Brian E Carpenter Message-ID: <0369a854-cfde-b0e6-3788-543ab2bea16c@gmail.com> Date: Mon, 23 Mar 2020 17:03:48 +1300 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [Bier] Flow Label [was Re: BIER in IPv6 --- draft-zhang-bier-bierin6-04] X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Mar 2020 04:03:57 -0000 Hi, I have not read the whole draft but I did notice this: > The Flow-ID in the IPv6 packet SHOULD be copied from the entropy > field in the BIER encapsulation. It's good that the BIER entropy field defined in RFC8296 is 20 bits long, but there are a few issues here: 1. Nit: in RFC 8200 the field is named "Flow Label", not "Flow-ID". 2. The text technically violates RFC8200, which states that the flow label is defined by RFC6437. 3. RFC6437 recommends the flow label generation procedure to follow a certain rule: It is therefore RECOMMENDED that source hosts support the flow label by setting the flow label field for all packets of a given flow to the same value chosen from an approximation to a discrete uniform distribution. but I didn't find any discussion in RFC8296 of how the BIER entropy value is generated. I think you could get round these two points by something like: The entropy value used in an IPv6 flow label SHOULD be generated by a method compatible with [RFC6437]. 4. Finally, it seems to me that the flow label is useless by definition for link-local traffic; however, it's harmless. (I never really thought about that before.) Of course, it could be relevant for globally-reachable addresses. Regards Brian Carpenter From nobody Sun Mar 22 23:27:45 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0074C3A07F6; Sun, 22 Mar 2020 23:27:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rBWuTecN8i_r; Sun, 22 Mar 2020 23:27:31 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 42E773A07F4; Sun, 22 Mar 2020 23:27:31 -0700 (PDT) Received: from LHREML714-CAH.china.huawei.com (unknown [172.18.7.106]) by Forcepoint Email with ESMTP id 6D04E66AE10EB879A9DD; Mon, 23 Mar 2020 06:27:29 +0000 (GMT) Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by LHREML714-CAH.china.huawei.com (10.201.108.37) with Microsoft SMTP Server (TLS) id 14.3.408.0; Mon, 23 Mar 2020 06:27:28 +0000 Received: from dggeme752-chm.china.huawei.com (10.3.19.98) by nkgeml705-chm.china.huawei.com (10.98.57.154) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.1713.5; Mon, 23 Mar 2020 14:27:26 +0800 Received: from dggeme752-chm.china.huawei.com ([10.6.80.76]) by dggeme752-chm.china.huawei.com ([10.6.80.76]) with mapi id 15.01.1713.004; Mon, 23 Mar 2020 14:27:25 +0800 From: "Gengxuesong (Geng Xuesong)" To: Tony Przygienda , zhang.zheng CC: 6MAN <6man@ietf.org>, BIER WG Thread-Topic: BIER in IPv6 --- draft-zhang-bier-bierin6-04 Thread-Index: AQHWAMJY4HdS9/NWzEmcrDnUJTIifqhVtkFQ Date: Mon, 23 Mar 2020 06:27:25 +0000 Message-ID: <45db7d3141664b08a2832020829326c1@huawei.com> References: <0aaf9a4e017643af85cd246b04d1858c@huawei.com> <202003231114061611017@zte.com.cn> In-Reply-To: Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.148.217] Content-Type: multipart/alternative; boundary="_000_45db7d3141664b08a2832020829326c1huaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Bier] BIER in IPv6 --- draft-zhang-bier-bierin6-04 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Mar 2020 06:27:35 -0000 --_000_45db7d3141664b08a2832020829326c1huaweicom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGksDQoNClRoYW5rIHlvdSBmb3IgeW91ciBwcm9tcHQgcmVzcG9uc2UsIGFuZCBnaXZpbmcgeW91 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<45db7d3141664b08a2832020829326c1@huawei.com> From: Brian E Carpenter Message-ID: <24f852f6-80df-b16f-6c3d-24be30373923@gmail.com> Date: Tue, 24 Mar 2020 08:40:46 +1300 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: <45db7d3141664b08a2832020829326c1@huawei.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [Bier] BIER in IPv6 --- draft-zhang-bier-bierin6-04 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Mar 2020 19:41:17 -0000 Hi Xuesong, > link-local forwarding concerns What are those concerns? Link-local forwarding is forbidden by RFC4291 an= d any router that performs it is completely faulty and should be thrown a= way. For the BIER scenario, link-local seems very suitable. Regards Brian Carpenter On 23-Mar-20 19:27, Gengxuesong (Geng Xuesong) wrote: > Hi, >=20 > =C2=A0 >=20 > Thank you for your prompt response, and giving your considerations abou= t these two methods. >=20 > I notice that you mentioned: >=20 >>>this has a nice side effect of allowing to "jump over non-BIER routers= " if addressed to bier prefix >=20 > So would this method be the preferred one to cover more scenarios ? >=20 > It seems to me that 2 different methods may need more technical conside= rations for both of them, such as , link-local forwarding concerns for op= tion 1 and global-address security concerns for option 2. >=20 > =C2=A0 >=20 > Best Regards >=20 > Xuesong >=20 > =C2=A0 >=20 > *From:*Tony Przygienda [mailto:tonysietf@gmail.com] > *Sent:* Monday, March 23, 2020 11:21 AM > *To:* zhang.zheng > *Cc:* Gengxuesong (Geng Xuesong) ; 6MAN <6man@i= etf.org>; BIER WG > *Subject:* Re: BIER in IPv6 --- draft-zhang-bier-bierin6-04 >=20 > =C2=A0 >=20 > That's a currently ongoing discussions between the auhtors (cc:'ing bie= r as well) >=20 > =C2=A0 >=20 > LL has advantages >=20 > * the packet cannot "escape" even if it has TTL > 1 >=20 > * such a scheme can work purely with ND >=20 > * it's hard to "send out the wrong interface" albeit v6 allows AFAIR to= have same link local on multiple interfaces >=20 > =C2=A0 >=20 > Originally the draft did not even allow for global addressing (since we= want to use v6 as L2-substitute here just like MPLS & non-MPLS encapsula= tions are used in BIER) but this has a nice side effect of allowing to "j= ump over non-BIER routers" if addressed to bier prefix (which I personall= y think should be the only allowed global v6 used, otherwise we may end u= p with BIER frames in funky places and possible "holes" in the replicatio= n fabric). Obviously strictly speaking it's not necessary since BIER can = be carried in plethora of normal unicast tunnels=C2=A0 but bunch of co-au= htors joined and the consensus was to allow it >=20 > =C2=A0 >=20 > --- tony >=20 > =C2=A0 >=20 > =C2=A0 >=20 > =C2=A0 >=20 > On Sun, Mar 22, 2020 at 8:15 PM > wrote: >=20 > Hi Xuesong, >=20 > =C2=A0 >=20 > Thank you for your question! >=20 > The LL address is used by direct connected neighbor. >=20 > For the neighbor which is not direct connected, the wider range add= ress should be used. >=20 > =C2=A0 >=20 > Thanks, >=20 > Sandy >=20 > =C2=A0 >=20 > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 >=20 > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*Gengxuesong(GengXuesong) > >=20 > *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E5=BC=A0=E5=BE=8100007940;6m= an@ietf.org <6man@ietf.org >= ; >=20 > *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8823=E6=97=A51= 1:03 >=20 > *=E4=B8=BB =E9=A2=98 =EF=BC=9ARE: Re:BIER in IPv6 --- draft-zhang-b= ier-bierin6-04* >=20 > Hi Sandy and authors of draft-zhang-bier-bierin6: >=20 > =C2=A0 >=20 > I have some questions about the section 2 when reading the draft. I= t is mentioned that: >=20 > =E2=80=9CIf... The destination address in IPv6 header SHOULD be the= neighbor's link-local address. >=20 > Otherwise... the destination address SHOULD be the BIER prefix of t= he BFR neighbor.=E2=80=9D >=20 > Seems like the draft proposes 2 methods of IPv6 header encapsulatio= n. >=20 > Could these 2 methods be combined ? If not, what's the use case and= design consideration for each method? >=20 > =C2=A0 >=20 > Best Regards >=20 > Xuesong >=20 > =C2=A0 >=20 > =C2=A0 >=20 > =C2=A0 >=20 > *From:*ipv6 [mailto:ipv6-bounces@ietf.org ]*On Behalf Of *zhang.zheng@zte.com.cn > *Sent:* Saturday, March 21, 2020 1:43 PM > *To:* 6man@ietf.org > *Subject:* Re:BIER in IPv6 --- draft-zhang-bier-bierin6-04 >=20 > =C2=A0 >=20 > Hi, >=20 > As co-author of BIERin6 (draft-zhang-bier-bierin6-04), before you r= ead the draft, please let me introduce BIER technology to you at first: >=20 > BIER technology, as defined in RFC8279, it's a new multicast techno= logy. The principle is achieving multicast forwarding by hop-by-hop execu= tion. >=20 > BIER is a transport protocol, not just a function. As defined in RF= C8296, BIER has it's own ethernet encapsulation with ethernet type 0xAB37= , and also it can be travelled by MPLS encapsulation. >=20 > BIER has it's own OAM function, ECMP function and traceability. etc= =2E through BIER header defined in RFC8296. >=20 > =C2=A0 >=20 > For travelling through IPv6 only enviroment, we'd like to travel BI= ER packet by IPv6 encapsulation. >=20 > In draft-zhang-bier-bierin6-04, we want to just use a new Next Head= er type for BIER header carrying. >=20 > We want to bring the minimum impact on IPv6 existed execution, and = the maximum flexibility for header interoperability. >=20 > So if you have any question about draft-zhang-bier-bierin6-04, or a= bout BIER technology itself, please tell me. I'am glad to explain them to= you. >=20 > =C2=A0 >=20 > Thanks, >=20 > Sandy >=20 > =C2=A0 >=20 > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 >=20 > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*TonyPrzygienda > >=20 > *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*Michael McBride >; >=20 > *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*6man@ietf.org <6man@ietf.org >; >=20 > *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8819=E6=97=A50= 1:12 >=20 > *=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: BIER in IPv6* >=20 > -------------------------------------------------------------------= - > IETF=C2=A0IPv6=C2=A0working=C2=A0group=C2=A0mailing=C2=A0list > ipv6@ietf.org > Administrative=C2=A0Requests:=C2=A0https://www.ietf.org/mailman/lis= tinfo/ipv6 > -------------------------------------------------------------------= - >=20 > >=20 > =C2=A0 >=20 > The specific ask here is for the 6man to look over both drafts, i.e= =2E >=20 > =C2=A0 >=20 > draft-zhang-bier-bierin6 >=20 > =C2=A0 >=20 > and >=20 > =C2=A0 >=20 > draft-xie-bier-ipv6-encapsulation >=20 > =C2=A0 >=20 > and verify whether they conform to published IPv6 standards or rais= e objections/concerns. >=20 > =C2=A0 >=20 > The requirements document is currently under active work/comments a= nd does not represent any final or wide-consensus state so an opinion on = its state is appreciated but it should not be used as any final or bindin= g list of requirements as to the targeted solution in BIER WG >=20 > =C2=A0 >=20 > thanks >=20 > =C2=A0 >=20 > --- tony >=20 > =C2=A0 >=20 > On Tue, Mar 17, 2020 at 9:20 PM Michael McBride > wrote: >=20 > Hello, >=20 > =C2=A0 >=20 > The bier wg could use your ipv6 recommendations. We=E2=80=99ve = worked on various solutions to transport a bier header in ipv6. We decide= d to pause and create a requirements document (draft-ietf-bier-ipv6-requi= rements) to help steer us towards the right solution(s). In that drafts a= ppendix we have a fairly good summary of the various solutions. >=20 > =C2=A0 >=20 > We=E2=80=99ve started to rally behind two solutions which meet = the majority of the requirements: draft-xie-bier-ipv6-encapsulation (bier= header in ipv6 EH) and draft-zhang-bier-bierin6 (bier header as payload = using ipv6 NH). The bier chairs today asked to punt the bierv6 topic to 6= man for advice before adopting any of these solutions. >=20 > =C2=A0 >=20 > So here we are seeking your advice. The most simple approach wo= uld probably be to give =C2=A0https://datatracker.ietf.org/doc/draft-ietf= -bier-ipv6-requirements/ a look and scroll down to the appendix to see a = summary of the various solutions we=E2=80=99ve been considering. >=20 > =C2=A0 >=20 > thanks! >=20 > mike >=20 > =C2=A0 >=20 > =C2=A0 >=20 > =C2=A0 >=20 > ---------------------------------------------------------------= ----- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/= ipv6 > ---------------------------------------------------------------= ----- >=20 > =C2=A0 >=20 > =C2=A0 >=20 > -------------------------------------------------------------------= - > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6= > -------------------------------------------------------------------= - >=20 >=20 > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- >=20 From nobody Mon Mar 23 13:09:01 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BF0603A0E05; 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Mon, 23 Mar 2020 13:08:29 -0700 (PDT) MIME-Version: 1.0 References: <0aaf9a4e017643af85cd246b04d1858c@huawei.com> <202003231114061611017@zte.com.cn> <45db7d3141664b08a2832020829326c1@huawei.com> <24f852f6-80df-b16f-6c3d-24be30373923@gmail.com> In-Reply-To: <24f852f6-80df-b16f-6c3d-24be30373923@gmail.com> From: Mark Smith Date: Tue, 24 Mar 2020 07:08:17 +1100 Message-ID: To: Brian E Carpenter Cc: "Gengxuesong (Geng Xuesong)" , Tony Przygienda , "zhang.zheng" , 6MAN <6man@ietf.org>, BIER WG Content-Type: multipart/alternative; boundary="000000000000d74f6f05a18b32bc" Archived-At: Subject: Re: [Bier] BIER in IPv6 --- draft-zhang-bier-bierin6-04 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Mar 2020 20:08:58 -0000 --000000000000d74f6f05a18b32bc Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 24 Mar 2020, 06:43 Brian E Carpenter, wrote: > Hi Xuesong, > > > link-local forwarding concerns > > What are those concerns? Link-local forwarding is forbidden by RFC4291 an= d > any router that performs it is completely faulty and should be thrown awa= y. > Actually, forwarding is allowed by RFC 4007, but only back onto the same link. > For the BIER scenario, link-local seems very suitable. > Sounds like I'd agree, just haven't read the ID. Packets with ULA or GUA DAs and LL SAs have been seen to leak off link. Those implementations a missing an RPF like check on LL SAs. The sending hosts shouldn't really be sending those packets in the first place. There's always a risk of bugs or non-compliant implementations, which is why Postel's law exists. (Wouldn't it be great if a "Implementations MUST be bug free." statement in an RFC was complied with 100%!) Regards, Mark. > Regards > Brian Carpenter > > On 23-Mar-20 19:27, Gengxuesong (Geng Xuesong) wrote: > > Hi, > > > > > > > > Thank you for your prompt response, and giving your considerations abou= t > these two methods. > > > > I notice that you mentioned: > > > >>>this has a nice side effect of allowing to "jump over non-BIER routers= " > if addressed to bier prefix > > > > So would this method be the preferred one to cover more scenarios ? > > > > It seems to me that 2 different methods may need more technical > considerations for both of them, such as , link-local forwarding concerns > for option 1 and global-address security concerns for option 2. > > > > > > > > Best Regards > > > > Xuesong > > > > > > > > *From:*Tony Przygienda [mailto:tonysietf@gmail.com] > > *Sent:* Monday, March 23, 2020 11:21 AM > > *To:* zhang.zheng > > *Cc:* Gengxuesong (Geng Xuesong) ; 6MAN < > 6man@ietf.org>; BIER WG > > *Subject:* Re: BIER in IPv6 --- draft-zhang-bier-bierin6-04 > > > > > > > > That's a currently ongoing discussions between the auhtors (cc:'ing bie= r > as well) > > > > > > > > LL has advantages > > > > * the packet cannot "escape" even if it has TTL > 1 > > > > * such a scheme can work purely with ND > > > > * it's hard to "send out the wrong interface" albeit v6 allows AFAIR to > have same link local on multiple interfaces > > > > > > > > Originally the draft did not even allow for global addressing (since we > want to use v6 as L2-substitute here just like MPLS & non-MPLS > encapsulations are used in BIER) but this has a nice side effect of > allowing to "jump over non-BIER routers" if addressed to bier prefix (whi= ch > I personally think should be the only allowed global v6 used, otherwise w= e > may end up with BIER frames in funky places and possible "holes" in the > replication fabric). Obviously strictly speaking it's not necessary since > BIER can be carried in plethora of normal unicast tunnels but bunch of > co-auhtors joined and the consensus was to allow it > > > > > > > > --- tony > > > > > > > > > > > > > > > > On Sun, Mar 22, 2020 at 8:15 PM zhang.zheng@zte.com.cn>> wrote: > > > > Hi Xuesong, > > > > > > > > Thank you for your question! > > > > The LL address is used by direct connected neighbor. > > > > For the neighbor which is not direct connected, the wider range > address should be used. > > > > > > > > Thanks, > > > > Sandy > > > > > > > > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 > > > > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*Gengxuesong(GengXuesong) gengxuesong@huawei.com>> > > > > *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E5=BC=A0=E5=BE=8100007940;6m= an@ietf.org <6man@ietf.org > >; > > > > *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8823=E6=97=A51= 1:03 > > > > *=E4=B8=BB =E9=A2=98 =EF=BC=9ARE: Re:BIER in IPv6 --- draft-zhang-b= ier-bierin6-04* > > > > Hi Sandy and authors of draft-zhang-bier-bierin6: > > > > > > > > I have some questions about the section 2 when reading the draft. I= t > is mentioned that: > > > > =E2=80=9CIf... The destination address in IPv6 header SHOULD be the > neighbor's link-local address. > > > > Otherwise... the destination address SHOULD be the BIER prefix of > the BFR neighbor.=E2=80=9D > > > > Seems like the draft proposes 2 methods of IPv6 header encapsulatio= n. > > > > Could these 2 methods be combined ? If not, what's the use case and > design consideration for each method? > > > > > > > > Best Regards > > > > Xuesong > > > > > > > > > > > > > > > > *From:*ipv6 [mailto:ipv6-bounces@ietf.org ipv6-bounces@ietf.org>]*On Behalf Of *zhang.zheng@zte.com.cn zhang.zheng@zte.com.cn> > > *Sent:* Saturday, March 21, 2020 1:43 PM > > *To:* 6man@ietf.org > > *Subject:* Re:BIER in IPv6 --- draft-zhang-bier-bierin6-04 > > > > > > > > Hi, > > > > As co-author of BIERin6 (draft-zhang-bier-bierin6-04), before you > read the draft, please let me introduce BIER technology to you at first: > > > > BIER technology, as defined in RFC8279, it's a new multicast > technology. The principle is achieving multicast forwarding by hop-by-hop > execution. > > > > BIER is a transport protocol, not just a function. As defined in > RFC8296, BIER has it's own ethernet encapsulation with ethernet type > 0xAB37, and also it can be travelled by MPLS encapsulation. > > > > BIER has it's own OAM function, ECMP function and traceability. etc= . > through BIER header defined in RFC8296. > > > > > > > > For travelling through IPv6 only enviroment, we'd like to travel > BIER packet by IPv6 encapsulation. > > > > In draft-zhang-bier-bierin6-04, we want to just use a new Next > Header type for BIER header carrying. > > > > We want to bring the minimum impact on IPv6 existed execution, and > the maximum flexibility for header interoperability. > > > > So if you have any question about draft-zhang-bier-bierin6-04, or > about BIER technology itself, please tell me. I'am glad to explain them t= o > you. > > > > > > > > Thanks, > > > > Sandy > > > > > > > > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 > > > > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*TonyPrzygienda tonysietf@gmail.com>> > > > > *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*Michael McBride michael.mcbride@futurewei.com>>; > > > > *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*6man@ietf.org <6man@ietf.org 6man@ietf.org>>; > > > > *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8819=E6=97=A50= 1:12 > > > > *=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: BIER in IPv6* > > > > -------------------------------------------------------------------= - > > IETF IPv6 working group mailing list > > ipv6@ietf.org > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > -------------------------------------------------------------------= - > > > > > > > > > > > > The specific ask here is for the 6man to look over both drafts, i.e= . > > > > > > > > draft-zhang-bier-bierin6 > > > > > > > > and > > > > > > > > draft-xie-bier-ipv6-encapsulation > > > > > > > > and verify whether they conform to published IPv6 standards or rais= e > objections/concerns. > > > > > > > > The requirements document is currently under active work/comments > and does not represent any final or wide-consensus state so an opinion on > its state is appreciated but it should not be used as any final or bindin= g > list of requirements as to the targeted solution in BIER WG > > > > > > > > thanks > > > > > > > > --- tony > > > > > > > > On Tue, Mar 17, 2020 at 9:20 PM Michael McBride < > michael.mcbride@futurewei.com > > wrote: > > > > Hello, > > > > > > > > The bier wg could use your ipv6 recommendations. We=E2=80=99ve = worked on > various solutions to transport a bier header in ipv6. We decided to pause > and create a requirements document (draft-ietf-bier-ipv6-requirements) to > help steer us towards the right solution(s). In that drafts appendix we > have a fairly good summary of the various solutions. > > > > > > > > We=E2=80=99ve started to rally behind two solutions which meet = the > majority of the requirements: draft-xie-bier-ipv6-encapsulation (bier > header in ipv6 EH) and draft-zhang-bier-bierin6 (bier header as payload > using ipv6 NH). The bier chairs today asked to punt the bierv6 topic to > 6man for advice before adopting any of these solutions. > > > > > > > > So here we are seeking your advice. The most simple approach > would probably be to give > https://datatracker.ietf.org/doc/draft-ietf-bier-ipv6-requirements/ a > look and scroll down to the appendix to see a summary of the various > solutions we=E2=80=99ve been considering. > > > > > > > > thanks! > > > > mike > > > > > > > > > > > > > > > > > -------------------------------------------------------------------- > > IETF IPv6 working group mailing list > > ipv6@ietf.org > > Administrative Requests: > https://www.ietf.org/mailman/listinfo/ipv6 > > > -------------------------------------------------------------------- > > > > > > > > > > > > -------------------------------------------------------------------= - > > IETF IPv6 working group mailing list > > ipv6@ietf.org > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > -------------------------------------------------------------------= - > > > > > > -------------------------------------------------------------------- > > IETF IPv6 working group mailing list > > ipv6@ietf.org > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > -------------------------------------------------------------------- > > > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- > --000000000000d74f6f05a18b32bc Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

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--000000000000a8a36805a1a30d10-- From nobody Wed Mar 25 07:32:21 2020 Return-Path: X-Original-To: bier@ietf.org Delivered-To: bier@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 6D6A13A0763; Wed, 25 Mar 2020 07:32:16 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Meeting Session Request Tool To: Cc: gjshep@gmail.com, bier@ietf.org, aretana.ietf@gmail.com, bier-chairs@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.123.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <158514673634.31234.17190153934890270936@ietfa.amsl.com> Date: Wed, 25 Mar 2020 07:32:16 -0700 Archived-At: Subject: [Bier] bier - New Interim Meeting Request X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Mar 2020 14:32:18 -0000 A new interim meeting request has just been submitted by Greg Shepherd. This request requires approval by the Area Director of the Routing Area The meeting can be approved here: https://datatracker.ietf.org/meeting/interim/request/interim-2020-bier-01 --------------------------------------------------------- Working Group Name: Bit Indexed Explicit Replication Area Name: Routing Area Session Requester: Greg Shepherd Meeting Type: Virtual Meeting Session 1: Date: 2020-04-14 Start Time: 08:00 America/Los_Angeles Duration: 00:30 Remote Participation Information: Remote participation information will be obtained at the time of approval Agenda Note: --------------------------------------------------------- From nobody Wed Mar 25 13:31:51 2020 Return-Path: X-Original-To: bier@ietf.org Delivered-To: bier@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 4EF993A0CCD; Wed, 25 Mar 2020 13:31:48 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IESG Secretary To: "IETF-Announce" Cc: bier@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.123.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <158516830800.31199.11452341577544756857@ietfa.amsl.com> Date: Wed, 25 Mar 2020 13:31:48 -0700 Archived-At: Subject: [Bier] Bit Indexed Explicit Replication (bier) WG Virtual Meeting: 2020-04-14 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Mar 2020 20:31:48 -0000 The Bit Indexed Explicit Replication (bier) Working Group will hold a virtual interim meeting on 2020-04-14 from 08:00 to 08:30 America/Los_Angeles (15:00 to 15:30 UTC). Agenda: Agenda, Notewell - Chairs, 5mins draft-ietf-bier-te-arch - Toerless Eckert, 10 min draft-ietf-bier-mld-04 - Stig Venaas, 5 min Information about remote participation: Remote participation information will be obtained at the time of approval From nobody Thu Mar 26 01:09:01 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 081343A0433; Thu, 26 Mar 2020 01:08:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KfttzGuqNLOc; Thu, 26 Mar 2020 01:08:49 -0700 (PDT) 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<202003261608135174458@zte.com.cn> In-Reply-To: References: 0aaf9a4e017643af85cd246b04d1858c@huawei.com, 202003231114061611017@zte.com.cn, CABNhwV0G945UCHN=tTqsGM99-vqSCUzFMeFbk0MkgDrR3DyyXw@mail.gmail.com Mime-Version: 1.0 From: To: Cc: , <6man@ietf.org>, Content-Type: multipart/mixed; boundary="=====_001_next=====" X-MAIL: mse-fl1.zte.com.cn 02Q88Dv0021245 Archived-At: Subject: Re: [Bier] =?utf-8?q?BIER_in_IPv6_---_draft-zhang-bier-bierin6-04?= X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2020 08:08:52 -0000 --=====_001_next===== Content-Type: multipart/related; boundary="=====_002_next=====" --=====_002_next===== Content-Type: multipart/alternative; boundary="=====_003_next=====" --=====_003_next===== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: base64 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bh=S2YmIT+aFZfdGvAGZlObdJRHHP9aR3fYBDde7VKokfg=; b=HV4vHAA6c3yWacIqoklDz3AUrciRNdqENtCE93U5SA6V21aFuYSpxC8POsHjJsVZkH vs4rQu4P+Hlofy+s+mAOgfSkwDymb7TClCLXITgaWDiY0NbgDzIHAxhNEQ/XGS9aremh D2yDQd67F+dHT7Y6pNuHgxK0X/dk5x5zLRktxszjYXIaSUllkDEtz+aRFBOK+18P5Njd nzuGEydQPhlGWIAiznCLgHY02nB4QDDY3aGr4rsssA0YzNfnVYtVLhFV3uZgIpFieoT/ EUabP1kgdGMTVM5FoR52UkCiX3pFyjjc7AFia6ggAB8aGIZr0Jf2Moea3h/yV08NXXlD 6P3w== X-Gm-Message-State: ANhLgQ0K2odgyCifkPsDsFIVbbClShXikmdKI/UIdOEF2REOTlzmyi7j Srh9ZR0ZFFhNKg9kjPgibHgHZdMJqPJoqGpqg9c= X-Google-Smtp-Source: ADFU+vvbu/awHOQLt3zl+EiUT9Q3FUF/MpigMtyFT4HcupVBzWY2YjHXA2xQfpSKdMx+PuYHTuJQbYon08o5rOWMcN4= X-Received: by 2002:a5d:9e4d:: with SMTP id i13mr6679703ioi.43.1585213774962; Thu, 26 Mar 2020 02:09:34 -0700 (PDT) MIME-Version: 1.0 References: <202003261608135174458@zte.com.cn> In-Reply-To: <202003261608135174458@zte.com.cn> From: Gyan Mishra Date: Thu, 26 Mar 2020 05:09:23 -0400 Message-ID: To: zhang.zheng@zte.com.cn Cc: 6man@ietf.org, bier@ietf.org, tonysietf@gmail.com Content-Type: multipart/alternative; boundary="000000000000f323de05a1be57d7" Archived-At: Subject: Re: [Bier] BIER in IPv6 --- draft-zhang-bier-bierin6-04 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2020 09:09:40 -0000 --000000000000f323de05a1be57d7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, Mar 26, 2020 at 4:08 AM wrote: > Hi Gyan, > > > Thank you very much for your comments! > > Sorry for the late response. > > Please find my answer with [Sandy] inline. :-) > > > Thanks, > > Sandy > > > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*GyanMishra > *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*Tony Przygienda ; > *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*6MAN <6man@ietf.org>;BIER WG ;=E5=BC=A0=E5=BE=8100007940; > *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8825=E6=97=A5 08:36 > *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: BIER in IPv6 --- draft-zhang-bier-bie= rin6-04* > Tony & Sandy > > So is the idea proposed in the two drafts mentioned for BIER IPv6 support > of encoding the BIER header up to 256 bit mask for BFER encoding schema > supporting up to I believe 128 BFERs per set - to encode the BIER header > into the DO EH - and then for directly connected neighbor the outer head= er > IPv6 encapsulation 1 hop tunnel used link local source and destination - > for non directly connected neighbors IPv6 encapsulation use multi hop > tunnel with GUI SA and DA. In both tunnel cases being mutually exclusive > the link local tunnel would have TTL 1 and multi hop would have appropria= te > >1 ttl. > > So this is 2 different solutions for 2 different use cases. Correct? > > [Sandy]: Sorry. No. The two solutions are used to solve one use case. And > there is no relationship between the Bitstringlength in BIER header and t= he > position in IPv6 header. > Gyan> Ok. The one use case is for being able to tunnel over hardware not supporting BIER and so for that you have the two tunnel options. The two tunnel types are link local or GUA and both are multi hop tunnels - Correct? > If all the routers support ethernet type 0xAB37, the ethernet > encapsulation will be used for BIER forwarding without IPv6 encapsulation= . > But in fact, it takes time that all types of silicon chip to support BIER > ethernet encapsulation. In the network which is IPv6-only, there are stil= l > some routers can't support BIER ethernet recognition. > > For these router which can support BIER forwarding in "software layer", > not in "silicon layer", we need IPv6 encapsulation for BIER travelling. > > But some routers may not even support BIER forwarding in "software layer" > (section 6.9, RFC8279), in order to travel across the these routers, tunn= el > with wider range address than LL is used. > > Gyan> So the crux of the issue is it may take some time for hardware to > catch up to support BIER forwarding. > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > Just as with BIER IPv4 with BIER IPv6, the IGP extensions would flood the > BIER info to build BIFT forwarding table to build the stateless MDT trees= . > In the case of SRv6 with disjoint BIER where traffic steering is required > to signal SRV6 topology the last header would be set to TBD. So that las= t > header would in non SRv6 IPv6 topology the Last header would be the DO EH > with the BIER header encoded. So with SRv6 how is the BIER header encoded= ? > For SRv6 support I am guessing we have to update the programming draft fo= r > an end type sid instantiation flavor variation for a new BIER SID? > > [Sandy]: In fact, there is no relationship with SRv6 and BIER. But > definitely they can be used together. > > Gyan>. Understood > I think you mean that we travel BIER packet across the non-BIER-capable > routers with SRv6 forwarding, right? > Gyan> Correct. > In this case, the encapsulated packet is: IPv6 header+SRH EH+BIER > header+payload. > > The only thing we need to do is define a new BIER EH. So in the Next > header field of SRH, the BIER EH type indicates that there is a BIER pack= et > which follows SRH. > Gyan> Understood > When the packet arrives the BIER-capable router which is also the last > Segment in SRH, the BIER header will be executed correctly. > > So there is no need to apply for a new function for this case. > > Gyan> so then no update necessary for Programming draft. > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > I am just thinking comparing BIER for v4 to BIER for v6 is there any way > you could accomplish the same with v6 and not do any IPv6 tunneling and > just add the L 2 1/2 BIER header and propagate the BIER header info into > the IGP to build the BIFT forwarding table just as you do with BIER v4. > I can see for egress node BFER support the intermediate nodes and maybe > even end node may not have to support BIER - but now if tunneling is use= d. > > Is that the business justification for tunneling or maybe some other > reason intrinsic to IPv6 I am missing. > Am I totally off base?? > > [Sandy]: Yes. If all the silicon chips support BIER ethernet recognition > in the network, we do not need any tunneling. > Gyan> Makes sense > The IPv4/IPv6 BFR-prefix flooding in IGP is used to build BIER forwarding > table. Tunnel is only used for travel across the non-BIER-capable router. > Gyan> Understood > > Gyan > > On Sun, Mar 22, 2020 at 11:24 PM Tony Przygienda > wrote: > >> That's a currently ongoing discussions between the auhtors (cc:'ing bier >> as well) >> >> LL has advantages >> * the packet cannot "escape" even if it has TTL > 1 >> * such a scheme can work purely with ND >> * it's hard to "send out the wrong interface" albeit v6 allows AFAIR to >> have same link local on multiple interfaces >> >> Originally the draft did not even allow for global addressing (since we >> want to use v6 as L2-substitute here just like MPLS & non-MPLS >> encapsulations are used in BIER) but this has a nice side effect of >> allowing to "jump over non-BIER routers" if addressed to bier prefix (wh= ich >> I personally think should be the only allowed global v6 used, otherwise = we >> may end up with BIER frames in funky places and possible "holes" in the >> replication fabric). Obviously strictly speaking it's not necessary sinc= e >> BIER can be carried in plethora of normal unicast tunnels but bunch of >> co-auhtors joined and the consensus was to allow it >> >> --- tony >> >> >> >> On Sun, Mar 22, 2020 at 8:15 PM wrote: >> >>> Hi Xuesong, >>> >>> >>> Thank you for your question! >>> >>> The LL address is used by direct connected neighbor. >>> >>> For the neighbor which is not direct connected, the wider range address >>> should be used. >>> >>> >>> Thanks, >>> >>> Sandy >>> >>> >>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 >>> >> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*Gengxuesong(GengXuesong) >>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E5=BC=A0=E5=BE=8100007940;6man@i= etf.org <6man@ietf.org>; >>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8823=E6=97=A5 11:0= 3 >>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**RE: Re:BIER in IPv6 --- draft-zhang-bie= r-bierin6-04* >>> >> Hi Sandy and authors of draft-zhang-bier-bierin6: >>> >>> >>> >>> I have some questions about the section 2 when reading the draft. It is >>> mentioned that: >>> >>> =E2=80=9CIf... The destination address in IPv6 header SHOULD be the nei= ghbor's >>> link-local address. >>> >>> Otherwise... the destination address SHOULD be the BIER prefix of the >>> BFR neighbor.=E2=80=9D >>> >>> Seems like the draft proposes 2 methods of IPv6 header encapsulation. >>> >>> Could these 2 methods be combined ? If not, what's the use case and >>> design consideration for each method? >>> >>> >>> >>> Best Regards >>> >>> Xuesong >>> >>> >>> >>> >>> >>> >>> >>> *From:* ipv6 [mailto:ipv6-bounces@ietf.org]*On Behalf Of * >>> zhang.zheng@zte.com.cn >>> *Sent:* Saturday, March 21, 2020 1:43 PM >>> *To:* 6man@ietf.org >>> *Subject:* Re:BIER in IPv6 --- draft-zhang-bier-bierin6-04 >>> >>> >>> >> Hi, >>> >>> As co-author of BIERin6 (draft-zhang-bier-bierin6-04), before you read >>> the draft, please let me introduce BIER technology to you at first: >>> >>> BIER technology, as defined in RFC8279, it's a new multicast technology= . >>> The principle is achieving multicast forwarding by hop-by-hop execution= . >>> >>> BIER is a transport protocol, not just a function. As defined in >>> RFC8296, BIER has it's own ethernet encapsulation with ethernet type >>> 0xAB37, and also it can be travelled by MPLS encapsulation. >>> >>> BIER has it's own OAM function, ECMP function and traceability. etc. >>> through BIER header defined in RFC8296. >>> >>> >>> >>> For travelling through IPv6 only enviroment, we'd like to travel BIER >>> packet by IPv6 encapsulation. >>> >>> In draft-zhang-bier-bierin6-04, we want to just use a new Next Header >>> type for BIER header carrying. >>> >>> We want to bring the minimum impact on IPv6 existed execution, and the >>> maximum flexibility for header interoperability. >>> >>> So if you have any question about draft-zhang-bier-bierin6-04, or about >>> BIER technology itself, please tell me. I'am glad to explain them to yo= u. >>> >>> >>> >>> Thanks, >>> >>> Sandy >>> >>> >>> >> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 >>> >> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*TonyPrzygienda >>> >>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*Michael McBride ; >>> >> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*6man@ietf.org <6man@ietf.org>; >>> >> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8819=E6=97=A5 01:12 >>> >>> *=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: BIER in IPv6* >>> >>> -------------------------------------------------------------------- >>> IETF IPv6 working group mailing list >>> ipv6@ietf.org >>> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >>> -------------------------------------------------------------------- >>> >>> >>> >>> >>> >>> The specific ask here is for the 6man to look over both drafts, i.e. >>> >>> >>> >>> draft-zhang-bier-bierin6 >>> >>> >>> >>> and >>> >>> >>> >>> draft-xie-bier-ipv6-encapsulation >>> >>> >>> >>> and verify whether they conform to published IPv6 standards or raise >>> objections/concerns. >>> >>> >>> >>> The requirements document is currently under active work/comments and >>> does not represent any final or wide-consensus state so an opinion on i= ts >>> state is appreciated but it should not be used as any final or binding = list >>> of requirements as to the targeted solution in BIER WG >>> >>> >>> >>> thanks >>> >>> >>> >>> --- tony >>> >>> >>> >>> On Tue, Mar 17, 2020 at 9:20 PM Michael McBride < >>> michael.mcbride@futurewei.com> wrote: >>> >>> Hello, >>> >>> >>> >>> The bier wg could use your ipv6 recommendations. We=E2=80=99ve worked o= n various >>> solutions to transport a bier header in ipv6. We decided to pause and >>> create a requirements document (draft-ietf-bier-ipv6-requirements) to h= elp >>> steer us towards the right solution(s). In that drafts appendix we have= a >>> fairly good summary of the various solutions. >>> >>> >>> >>> We=E2=80=99ve started to rally behind two solutions which meet the majo= rity of >>> the requirements: draft-xie-bier-ipv6-encapsulation (bier header in ipv= 6 >>> EH) and draft-zhang-bier-bierin6 (bier header as payload using ipv6 NH)= . >>> The bier chairs today asked to punt the bierv6 topic to 6man for advice >>> before adopting any of these solutions. >>> >>> >>> >>> So here we are seeking your advice. The most simple approach would >>> probably be to give >>> https://datatracker.ietf.org/doc/draft-ietf-bier-ipv6-requirements/ a >>> look and scroll down to the appendix to see a summary of the various >>> solutions we=E2=80=99ve been considering. >>> >>> >>> >>> thanks! >>> >>> mike >>> >>> >>> >>> >>> >>> >>> >>> -------------------------------------------------------------------- >>> IETF IPv6 working group mailing list >>> ipv6@ietf.org >>> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >>> -------------------------------------------------------------------- >>> >>> >>> >>> >>> -------------------------------------------------------------------- >>> IETF IPv6 working group mailing list >>> ipv6@ietf.org >>> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >>> -------------------------------------------------------------------- >>> >> -------------------------------------------------------------------- >> IETF IPv6 working group mailing list >> ipv6@ietf.org >> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> -------------------------------------------------------------------- >> > -- > > Gyan Mishra > > Network Engineering & Technology > > Verizon > > Silver Spring, MD 20904 > > Phone: 301 502-1347 > > Email: gyan.s.mishra@verizon.com > > > > > -- Gyan Mishra Network Engineering & Technology Verizon Silver Spring, MD 20904 Phone: 301 502-1347 Email: gyan.s.mishra@verizon.com --000000000000f323de05a1be57d7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Thu, Mar 26, 2020 at 4:08 AM <zhang.zheng@zte.com.cn> wrote:

Hi= Gyan,


Thank you very much for your comments!

Sorry for the late response= .

Please find my answer wi= th [Sandy] inline. :-)

Thanks,

Sandy


=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AGyanMishra <hayabusagsm@gmail.com>
=E6=94= =B6=E4=BB=B6=E4=BA=BA=EF=BC=9ATony = Przygienda <ton= ysietf@gmail.com>;
=E6=8A=84=E9=80=81=E4=BA= =BA=EF=BC=9A6MAN <6man@ietf.org>;BIER WG <bier@ietf.org>;=E5= =BC=A0=E5=BE=8100007940;
=E6=97=A5 =E6=9C=9F =EF= =BC=9A2020=E5=B9=B403=E6=9C=8825=E6=97=A5 08:36
=
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: BIER i= n IPv6 --- draft-zhang-bier-bierin6-04
Tony & Sandy=C2=A0

= So is the idea proposed in the two drafts mentioned for BIER IPv6 support o= f encoding the BIER header up to 256 bit mask for BFER encoding schema supp= orting up to I believe 128 BFERs per set - to encode the BIER header into t= he DO EH - =C2=A0and then for directly connected neighbor the outer header = IPv6 encapsulation 1 hop tunnel used link local source and destination - fo= r non directly connected neighbors IPv6 encapsulation use multi hop tunnel = with GUI SA and DA.=C2=A0 In both tunnel cases being mutually exclusive the= link local tunnel would have TTL 1 and multi hop would have appropriate = =C2=A0>1 ttl.

So this is 2 different solutions for 2 different u= se cases.=C2=A0 Correct?

[Sandy]: Sorry. No. The two solutions are us= ed to solve one use case. And there is no relationship between the Bitstrin= glength in BIER header and the position in IPv6 header.

=C2=A0 =C2=A0 Gyan> O= k.=C2=A0 The one use case is for being able to tunnel over hardware not sup= porting BIER and so for that you have the two tunnel options.=C2=A0 The two= tunnel types are link local or GUA and both are multi hop tunnels - Correc= t?=C2=A0

If all the routers support ethernet type 0xAB37, the ethernet en= capsulation will be used for BIER forwarding without IPv6 encapsulation.

But in fact, it takes time t= hat all types of silicon chip to support BIER ethernet encapsulation. In th= e network which is IPv6-only, there are still some routers can't suppor= t BIER ethernet recognition.=C2=A0

For these router which can support= BIER forwarding in "software layer", not in "silicon layer&= quot;,=C2=A0we need IPv6 encapsulation for= BIER travelling.

But some routers may not even support BIER f= orwarding in "software layer" (section 6.9, RFC8279), in order to= travel across the these routers, tunnel with wider range address than LL i= s used.

Gyan> So the crux of the issue is it may take some time fo= r hardware to catch up to support BIER forwarding.

=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Just as wit= h BIER IPv4 with BIER IPv6, the IGP extensions would flood the BIER info to= build BIFT forwarding table to build the stateless MDT trees.
In the case of SRv6 with disjoint BIER where traffic steering is= required to signal SRV6 topology the last header would be set to TBD.=C2= =A0 So that last header would in non SRv6 IPv6 topology the Last header wou= ld be the DO EH with the BIER header encoded. So with SRv6 how is the BIER = header encoded?
For SRv6 support I am guessing we ha= ve to update the programming draft for an end type sid instantiation flavor= variation for a new BIER SID?

[Sandy]: In fact, there is no relati= onship with SRv6 and BIER. But definitely they can be used together.=C2=A0<= /p>

=C2=A0 =C2=A0Gyan>. Understood=C2=A0

I think you mean that we travel BIER p= acket across the non-BIER-capable routers with SRv6 forwarding, right?=C2= =A0

<= br>
=C2=A0 =C2=A0 =C2=A0Gyan> Correct.

In this = case, the encapsulated packet is: IPv6 header+SRH EH+BIER header+payload.=C2=A0

The only thing we need to do is define a new BIER EH. So in the Ne= xt header field of SRH, the BIER EH type indicates that there is a BIER pac= ket which follows SRH.=C2=A0

=
=C2=A0 =C2=A0 Gyan> Understood=C2=A0

When= the packet arrives the BIER-capable router which is also the last Segment = in SRH, the BIER header will be executed correctly.=C2=A0

So there is no need to apply for a new functio= n for this case.

Gyan> so then no update necessary for Prog= ramming draft.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=

I am just thinking comparing BIER for v4 to BIER for = v6 is there any way you could accomplish the same with v6 and not do any IP= v6 tunneling and just add the L 2 1/2 BIER header and propagate the BIER he= ader info into the IGP to build the BIFT forwarding table just as you do wi= th BIER v4.
I can see for egress node BFER support t= he intermediate nodes and maybe even end =C2=A0node may not have to support= BIER - but now if tunneling is used. =C2=A0
Is that= the business justification for tunneling or maybe some other reason intrin= sic to IPv6 I am missing.
Am I totally off base??

[Sandy]: Yes. If all the silicon chips support BIER ethernet reco= gnition in the network, we do not need any tunneling.

=

=C2=A0 =C2=A0 Gyan> Makes sense=C2=A0

The IPv4/IPv6 BFR-prefix flood= ing in IGP is used to build BIER forwarding table. Tunnel is only used for = travel across the non-BIER-capable router.


=C2=A0 = =C2=A0Gyan> Understood=C2=A0

Gyan

=
On Sun, Mar 22, 2020 at 11:24 PM Tony Przygienda <tonysietf@gmail.com&= gt; wrote:
=
That's a currently ongoing dis= cussions between the auhtors (cc:'ing bier as well)

LL ha= s advantages
* the packet cannot "escape" even if it ha= s TTL > 1
* such a scheme can work purely with ND
* = it's hard to "send out the wrong interface" albeit v6 allows = AFAIR to have same link local on multiple interfaces

Original= ly the draft did not even allow for global addressing (since we want to use= v6 as L2-substitute here just like MPLS & non-MPLS encapsulations are = used in BIER) but this has a nice side effect of allowing to "jump ove= r non-BIER routers" if addressed to bier prefix (which I personally th= ink should be the only allowed global v6 used, otherwise we may end up with= BIER frames in funky places and possible "holes" in the replicat= ion fabric). Obviously strictly speaking it's not necessary since BIER = can be carried in plethora of normal unicast tunnels=C2=A0 but bunch of co-= auhtors joined and the consensus was to allow it

--- ton= y



On Sun, Mar 22, 2020 at 8:15 PM <zhang.zheng@zte.com.cn> wro= te:

Hi Xuesong,


Thank you for your question!

The LL address is used by direct connected ne= ighbor.

For the neighbor w= hich is not direct connected, the wider range address should be used.


Thanks,

Sandy


<= /blockquote>
=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6<= /div>
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF= =BC=9AGengxuesong(GengXuesong) <gengxuesong@huawei.com>
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E5=BC=A0=E5=BE=8100007940;6man@ietf.org <6man@ietf.org>;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2020=E5=B9=B403=E6= =9C=8823=E6=97=A5 11:03
=E4=B8=BB =E9=A2=98 =EF=BC=9ARE: Re:BIER in IPv6 --- draft-zhang-bier-bierin6-04
<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">

Hi Sandy and authors of draft-zhang-bier-bierin6:

=C2=A0

I have some questions = about the section 2 when reading the draft. It is mentioned that:

=E2=80=9CIf... The destination address in IPv6 header = SHOULD be the neighbor's link-local address.

Otherwise... the destination address SHOULD be the BIER prefix of the B= FR neighbor.=E2=80=9D

Seems like the draft pr= oposes 2 methods of IPv6 header encapsulation.

Could these 2 methods = be combined ? If not, what's the use case and design consideration for = each method?

=C2=A0

Best Regards

Xuesong

=C2=A0

=C2=A0

=C2=A0

From: ipv6 [mailto:ipv6-bounces@ietf.org]On Behalf Of zhang.zheng@zte.com.cn
Sent: Saturday, March 21, 2020 1:43 PM
To: 6man@ietf.org
<= strong>Subject: Re:BIER in IPv6 --- draft-zhang-bier-bierin6-04

=C2=A0

=

<= span lang=3D"EN-US">Hi,

As co-author of B= IERin6 (draft-zhang-bier-bierin6-04), before you read the draft, please let= me introduce BIER technology to you at first:

BIER technology, as defined in RFC8279, it's a new multicast tech= nology. The principle is achieving multicast forwarding by hop-by-hop execu= tion.

BIER is a transport protocol, not j= ust a function. As defined in RFC8296, BIER has it's own ethernet encap= sulation with ethernet type 0xAB37, and also it can be travelled by MPLS en= capsulation.

BIER has it's own OAM fu= nction, ECMP function and traceability. etc. through BIER header defined in= RFC8296.

=C2=A0

For travelling through IPv6 only enviroment, we'd like to tr= avel BIER packet by IPv6 encapsulation.

I= n draft-zhang-bier-bierin6-04, we want to just use a new Next Header type f= or BIER header carrying.

We want to bring= the minimum impact on IPv6 existed execution, and the maximum flexibility = for header interoperability.

So if you ha= ve any question about draft-zhang-bier-bierin6-04, or about BIER technology= itself, please tell me. I'am glad to explain them to you.

=C2=A0

Thanks,

Sandy

=C2=A0

=

=E5=8E=9F=E5=A7=8B=E9=82=AE=E4= =BB=B6

=

=E5=8F=91=E4=BB=B6=E4=BA= =BA=EF=BC=9ATonyPrzygienda <tonysietf@gmail.com&g= t;

=E6=94=B6=E4=BB=B6=E4=BA=BA=EF= =BC=9AMichael McBride <michael.mcbride@futu= rewei.com>;

=

=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A6man@ietf= .org <6man@ietf.o= rg>;

<= /div>
=
=E6=97=A5 =E6=9C=9F =EF=BC=9A2= 020=E5=B9=B403=E6=9C=8819=E6=97=A5 01:12

=E4=B8=BB =E9= =A2=98 =EF=BC=9ARe: BIER in IPv6

----------------------= ----------------------------------------------
IETF=C2=A0IPv6=C2=A0worki= ng=C2=A0group=C2=A0mailing=C2=A0list
ipv6@ietf.org
Administrative=C2=A0Requests:=C2=A0https= ://www.ietf.org/mailman/listinfo/ipv6
------------------------------= --------------------------------------

<BIER WG chair hat on>

=C2=A0

The specific ask here is for the 6man to l= ook over both drafts, i.e.

=C2=A0

draft-zhang-bier-bierin6

=C2=A0

and

=C2=A0<= /span>

draft-xie-bier-i= pv6-encapsulation

=C2=A0

and ve= rify whether they conform to published IPv6 standards or raise objections/c= oncerns.

=C2=A0=

The requirement= s document is currently under active work/comments and does not represent a= ny final or wide-consensus state so an opinion on its state is appreciated = but it should not be used as any final or binding list of requirements as to the targeted solution in BIER WG

=C2=A0

thanks

=C2=A0

--- tony

=C2=A0

On Tue, Mar 17, 2020 at 9:20 PM Michael McBride <michael.mcbride@futu= rewei.com> wrote:

Hello,

=C2=A0

The bier wg= could use your ipv6 recommendations. We=E2=80=99ve worked on various solut= ions to transport a bier header in ipv6. We decided to pause and create a r= equirements document (draft-ietf-bier-ipv6-requirements) to help steer us towards the = right solution(s). In that drafts appendix we have a fairly good summary of= the various solutions.

=C2=A0

We=E2=80=99= ve started to rally behind two solutions which meet the majority of the req= uirements: draft-xie-bier-ipv6-encapsulation (bier header in ipv6 EH) and d= raft-zhang-bier-bierin6 (bier header as payload using ipv6 NH). The bier chairs today asked to pun= t the bierv6 topic to 6man for advice before adopting any of these solution= s.

=C2=A0

<= p class=3D"MsoNormal">So here we are seeking your advi= ce. The most simple approach would probably be to give =C2=A0https://datatracker.ietf.org/doc/draft-ietf-bier-ipv6-requirements= / a look and scroll down to the appendix to see a summary of the various sol= utions we=E2=80=99ve been considering.

=C2=A0

thanks!

mike

=C2=A0

=C2=A0

=C2=A0

--------------------------------------------------------------------IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative Requests: https://www.ie= tf.org/mailman/listinfo/ipv6
---------------------------------------= -----------------------------

=C2=A0


------------------------= --------------------------------------------
IETF IPv6 working group mai= ling list
ipv6@ietf.o= rg
Administrative Requests: https://www.ietf.org/ma= ilman/listinfo/ipv6
------------------------------------------------= --------------------
--------------------------------= ------------------------------------
IETF IPv6 working group mailing lis= t
ipv6@ietf.orgAdministrative Requests: https://www.ietf.org/mailman/li= stinfo/ipv6
--------------------------------------------------------= ------------
--
<= div>

Gyan=C2=A0 Mis= hra

Network Engineering & Technology=C2=A0<= /p>

Verizon=C2=A0

Silver Spring, MD 20904

Ph= one: 301 502-1347

Email: gyan.s.mishra@verizon.com



=


--
=

Gyan=C2=A0 Mishra

Network Engineering & Technology=C2=A0

=

Verizon=C2=A0

Silver Spring, MD 20904

Phone: 301 502-1347

Email: gyan.s.mishra@verizon.com



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--=====_001_next=====-- From nobody Thu Mar 26 05:17:41 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 725553A0D01; Thu, 26 Mar 2020 05:17:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.898 X-Spam-Level: X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[AC_DIV_BONANZA=0.001, BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WYcnQmbmIb_Y; Thu, 26 Mar 2020 05:17:22 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D37343A0DFC; Thu, 26 Mar 2020 05:17:21 -0700 (PDT) Received: from LHREML712-CAH.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id 2597364F40760D11E50C; Thu, 26 Mar 2020 12:17:20 +0000 (GMT) Received: from nkgeml709-chm.china.huawei.com (10.98.57.40) by LHREML712-CAH.china.huawei.com (10.201.108.35) with Microsoft SMTP Server (TLS) id 14.3.408.0; Thu, 26 Mar 2020 12:17:19 +0000 Received: from dggeme752-chm.china.huawei.com (10.3.19.98) by nkgeml709-chm.china.huawei.com (10.98.57.40) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.1713.5; Thu, 26 Mar 2020 20:17:04 +0800 Received: from dggeme752-chm.china.huawei.com ([10.6.80.76]) by dggeme752-chm.china.huawei.com ([10.6.80.76]) with mapi id 15.01.1713.004; Thu, 26 Mar 2020 20:17:04 +0800 From: "Gengxuesong (Geng Xuesong)" To: "zhang.zheng@zte.com.cn" , "hayabusagsm@gmail.com" CC: "bier@ietf.org" , "6man@ietf.org" <6man@ietf.org> Thread-Topic: Re:BIER in IPv6 --- draft-zhang-bier-bierin6-04 Thread-Index: AQHWA1DLr5pzrtuNk06J0kLVugNaRKhax9Yw Date: Thu, 26 Mar 2020 12:17:04 +0000 Message-ID: References: CABNhwV0G945UCHN=tTqsGM99-vqSCUzFMeFbk0MkgDrR3DyyXw@mail.gmail.com, CABNhwV00MFZ794q2QOiLA2p51O8m5w6oG6AUwQaCMpMa1A_r+w@mail.gmail.com <202003261725503637966@zte.com.cn> In-Reply-To: <202003261725503637966@zte.com.cn> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.148.217] Content-Type: multipart/alternative; boundary="_000_a2a32121735b4420a99ea0ee101a3e1ehuaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Bier] BIER in IPv6 --- draft-zhang-bier-bierin6-04 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2020 12:17:40 -0000 --_000_a2a32121735b4420a99ea0ee101a3e1ehuaweicom_ 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dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qR_OgPEbZ7wW for ; Thu, 26 Mar 2020 08:42:05 -0700 (PDT) Received: from mail-qt1-x831.google.com (mail-qt1-x831.google.com [IPv6:2607:f8b0:4864:20::831]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 26F8A3A0D6B for ; Thu, 26 Mar 2020 08:42:05 -0700 (PDT) Received: by mail-qt1-x831.google.com with SMTP id x16so5634877qts.11 for ; Thu, 26 Mar 2020 08:42:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:reply-to:from:date:message-id :subject:to; bh=ew+18xF7CJuzFbhcsJwY7oNK+GV31BHZiqmH2buBLDQ=; b=K2gmVUfsfuDseTdqQ7eJzTtpKpZJFCBZKUeMFjq2qlTC8eUsGBVEXS6blIdokPj33d 4y8llbhDUcsrY1Tse3XcGatpffWVC3ltBv8es8zI/myE9LANB2X4JIqLOZE+wukVjsd/ 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ADFU+vuoKT50JkhMq0gbvdJyEdnC3vpHplFRsdY1BS/5y+P2s6XYMXnA9p5Imqqy3d054pVQXDeecVdd5io9IYULlOI= X-Received: by 2002:ac8:6d19:: with SMTP id o25mr9043431qtt.303.1585237323666; Thu, 26 Mar 2020 08:42:03 -0700 (PDT) MIME-Version: 1.0 References: <158516830800.31199.11452341577544756857@ietfa.amsl.com> In-Reply-To: <158516830800.31199.11452341577544756857@ietfa.amsl.com> Reply-To: gjshep@gmail.com From: Greg Shepherd Date: Thu, 26 Mar 2020 08:41:53 -0700 Message-ID: To: BIER WG Content-Type: multipart/alternative; boundary="0000000000008fd7c305a1c3d376" Archived-At: Subject: [Bier] Fwd: Bit Indexed Explicit Replication (bier) WG Virtual Meeting: 2020-04-14 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2020 15:42:20 -0000 --0000000000008fd7c305a1c3d376 Content-Type: text/plain; charset="UTF-8" *, We have time for more presos if anyone wants to be added to the agenda. Please email chairs with your request, title, presenter name and time request. Thanks, Shep (Chairs) ---------- Forwarded message --------- From: IESG Secretary Date: Wed, Mar 25, 2020 at 1:31 PM Subject: [Bier] Bit Indexed Explicit Replication (bier) WG Virtual Meeting: 2020-04-14 To: IETF-Announce Cc: The Bit Indexed Explicit Replication (bier) Working Group will hold a virtual interim meeting on 2020-04-14 from 08:00 to 08:30 America/Los_Angeles (15:00 to 15:30 UTC). Agenda: Agenda, Notewell - Chairs, 5mins draft-ietf-bier-te-arch - Toerless Eckert, 10 min draft-ietf-bier-mld-04 - Stig Venaas, 5 min Information about remote participation: Remote participation information will be obtained at the time of approval _______________________________________________ BIER mailing list BIER@ietf.org https://www.ietf.org/mailman/listinfo/bier --0000000000008fd7c305a1c3d376 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

*,

We have time for more presos if = anyone wants to be added to the agenda. Please email chairs with your reque= st, title, presenter name and time request.

Thanks= ,
Shep
(Chairs)
---------- Forwarded message ---------
Fro= m: IESG Secretary = <iesg-secr= etary@ietf.org>
Date: Wed, Mar 25, 2020 at 1:31 PM
Subj= ect: [Bier] Bit Indexed Explicit Replication (bier) WG Virtual Meeting: 202= 0-04-14
To: IETF-Announce <= ietf-announce@ietf.org>
Cc: <bier@ietf.org>


The Bit Indexed Explicit Replicatio= n (bier) Working Group will hold
a virtual interim meeting on 2020-04-14 from 08:00 to 08:30 America/Los_Ang= eles (15:00 to 15:30 UTC).

Agenda:
Agenda, Notewell - Chairs, 5mins
draft-ietf-bier-te-arch - Toerless Eckert, 10 min
draft-ietf-bier-mld-04 - Stig Venaas, 5 min

Information about remote participation:
Remote participation information will be obtained at the time of approval
_______________________________________________
BIER mailing list
BIER@ietf.org
https://www.ietf.org/mailman/listinfo/bier
--0000000000008fd7c305a1c3d376-- From nobody Thu Mar 26 09:13:31 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B9E1C3A0BDD; Thu, 26 Mar 2020 09:13:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id efiKzlysVt39; Thu, 26 Mar 2020 09:13:11 -0700 (PDT) Received: from mail-io1-xd2f.google.com (mail-io1-xd2f.google.com [IPv6:2607:f8b0:4864:20::d2f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1C00A3A0772; Thu, 26 Mar 2020 09:13:11 -0700 (PDT) Received: by mail-io1-xd2f.google.com with SMTP id d15so6639440iog.3; Thu, 26 Mar 2020 09:13:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=dktr2YmO2UqhzVlHTWxvaMtE4UBsDMs7McCXeVXtaN4=; b=MaICEMhr30JCd3iV35ra5exGEvAC0FeDdzdLWHi5RV0LboZBphZe7sYxNmw4I4nNmC knGH9ZdsQnO3YM381HNk3+mpJjJCxc2RbrGdkkMwW0tyV20d04AN+qpPbWzJaIxv7uYn nebZMLLNdLVKHhVdqHG22FZK+0Kb4Ib3n+uO/auLqULW3XHUNYcINFrhovf6ehNDY1XB WfOXmerXPekyycxcts1an1P862OPnno/WJeKqm6QZXoPIQPMMnBWzebJZiu3CUaUk7nc H94+N8DLU/p6dYstykhCwVTgF6gfhVcM7zgPZwa9ahkfK97umjiuXJj7/9MyrlqejtDA vZTg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=dktr2YmO2UqhzVlHTWxvaMtE4UBsDMs7McCXeVXtaN4=; b=r9WPkwtXctRDrSCQvFUfFKNqfFixmZXWMlVwh1gYZQrCtiSiS/cy977xtImmL0xygj fmxxazc0eAaRf5LSRuOR4qOjZPOgo01dpC8s4uI0Kapu118SK1XEEllVy0AVuPrTwI56 LO07+ykNysJt4c0dZkY9YTsTjA73BKUAvOJg8GKo2B5IJzdA5/qxIyvVQz0jygHRfI+K O6zKKs38t87fW8nwhp5W+gy8PEve3MDC6s7a+Qz7zS4xOQB79enubaTjbInR6FwMiiKe bE1nucn6lw44Fo5qSiseiWtlei0BbdcdEnoo5/0J4uRXJ8NgPX5//4cQdo+fPXDiShqo GCNQ== X-Gm-Message-State: ANhLgQ2mmkFEzwfmdgXzLWPsZ9YMD6hTXW2HOSMDJ9YNESCwjmgxMpnF 96o0FcQoOCMxmiDitsUJfVUPF08Db8yuzSNzB2w= X-Google-Smtp-Source: ADFU+vst5ulEXO5A6uiB06bib3HP8S7TJYjVcqfWBsLZWvZ0Cbjp3rLZFoD3UdNcd+ZM1ahIWmnCdELppB6XZKLpjuI= X-Received: by 2002:a5d:9d0d:: with SMTP id j13mr8488759ioj.174.1585239190392; Thu, 26 Mar 2020 09:13:10 -0700 (PDT) MIME-Version: 1.0 References: <202003261725503637966@zte.com.cn> In-Reply-To: <202003261725503637966@zte.com.cn> From: Tony Przygienda Date: Thu, 26 Mar 2020 09:11:16 -0700 Message-ID: To: "zhang.zheng" Cc: Gyan Mishra , 6MAN <6man@ietf.org>, BIER WG Content-Type: multipart/alternative; boundary="000000000000d3d2e905a1c442db" Archived-At: Subject: Re: [Bier] BIER in IPv6 --- draft-zhang-bier-bierin6-04 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2020 16:13:14 -0000 --000000000000d3d2e905a1c442db Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, Mar 26, 2020 at 2:26 AM wrote: > Hi Gyan, > > > Please find my answer by [Sandy2]. :-) > > > Thanks, > > Sandy > > > > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*GyanMishra > *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E5=BC=A0=E5=BE=8100007940; > *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*6man@ietf.org <6man@ietf.org>;bier@= ietf.org ; > tonysietf@gmail.com ; > *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8826=E6=97=A5 17:09 > *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: BIER in IPv6 --- draft-zhang-bier-bie= rin6-04* > > > On Thu, Mar 26, 2020 at 4:08 AM wrote: > >> Hi Gyan, >> >> >> Thank you very much for your comments! >> >> Sorry for the late response. >> >> Please find my answer with [Sandy] inline. :-) >> >> >> Thanks, >> >> Sandy >> >> >> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 >> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*GyanMishra >> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*Tony Przygienda ; >> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*6MAN <6man@ietf.org>;BIER WG ;=E5=BC=A0=E5=BE=8100007940; >> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8825=E6=97=A5 08:36 >> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: BIER in IPv6 --- draft-zhang-bier-bi= erin6-04* >> Tony & Sandy >> >> So is the idea proposed in the two drafts mentioned for BIER IPv6 suppor= t >> of encoding the BIER header up to 256 bit mask for BFER encoding schema >> supporting up to I believe 128 BFERs per set - to encode the BIER header >> into the DO EH - and then for directly connected neighbor the outer hea= der >> IPv6 encapsulation 1 hop tunnel used link local source and destination - >> for non directly connected neighbors IPv6 encapsulation use multi hop >> tunnel with GUI SA and DA. In both tunnel cases being mutually exclusiv= e >> the link local tunnel would have TTL 1 and multi hop would have appropri= ate >> >1 ttl. >> >> So this is 2 different solutions for 2 different use cases. Correct? >> >> [Sandy]: Sorry. No. The two solutions are used to solve one use case. An= d >> there is no relationship between the Bitstringlength in BIER header and = the >> position in IPv6 header. >> > Gyan> Ok. The one use case is for being able to tunnel over hardware > not supporting BIER and so for that you have the two tunnel options. The > two tunnel types are link local or GUA and both are multi hop tunnels - > Correct? > >> [Sandy2]: Yes. If you think they are all tunneling. :-) >> > Yes, critical point. We are _not_ "tunneling" in case of LL to LL BIERin6 in fact for all practical purposes (tunnel assumes fragmentation/security etc which BIER architecture does NOT presume from L2 header, we do not expect Ethernet to fragment or encrypt BIER). IPv6 is basically used the same way we use ethernet, it's poor man's "L2 header" that allows standard, non-extended silicon to throw stuff to slow path to process if silicon doesn't support BIER (will be reality for e.g. cheap WiFi routers for ages to come I think). If silicon does support BIER fast path can be taken as well with bierin6 but if silicon supports BIRE we have L2 encaps which arguably should be used rather than twisting ipv6. BIER architecture uses unicast tunnels to get frames across parts of network without BIER support as well. Now, here the bierin6 is irresistibly convienent to just stick a BFR prefix as destination and hop over routers without even signalling a tunnel and then it is a unicast tunnel from BIER perspective. Kind of like SR or SRv6 or MPLS tunnel (which need to be differntatied from BIER running natively over MPLS labels) but for v6 no special HW support is needed so that's neat ;-) SR/SRv6/IP forwarding/GRE are just unicast tunnels to BIER. --- tony --000000000000d3d2e905a1c442db Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=
On Thu, Mar 26, 2020 at 2:26 AM <<= a href=3D"mailto:zhang.zheng@zte.com.cn">zhang.zheng@zte.com.cn> wro= te:

Hi Gyan,


Please find my answer by [Sandy2]. :-)


Thanks,=

Sandy

<= p style=3D"margin:0px;line-height:20px">

= =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AGy= anMishra <hay= abusagsm@gmail.com>
=E6=94=B6=E4=BB=B6=E4=BA=BA= =EF=BC=9A=E5=BC=A0=E5=BE=8100007940;
=E6=97=A5 =E6=9C=9F =EF=BC= =9A2020=E5=B9=B403=E6=9C=8826=E6=97=A5 17:09
= =E4=B8=BB =E9=A2=98 =EF=BC=9ARe: BIER in IPv6 --- draft-zhang-= bier-bierin6-04

<= div>
On= Thu, Mar 26, 2020 at 4:08 AM <zhang.zheng@zte.com.cn> wrote:

Hi Gyan,

=

Thank you very much f= or your comments!

Sorry fo= r the late response.

Pleas= e find my answer with [Sandy] inline. :-)


Thank= s,

Sandy


<= div style=3D"width:100%;height:28px;line-height:28px;background-color:rgb(2= 24,229,233);color:rgb(19,136,255);text-align:center">=E5=8E=9F=E5=A7=8B=E9= =82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AGyanMis= hra <hayabusa= gsm@gmail.com>
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A= Tony Przygienda <tonysietf@gmail.com>;
<= div>=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A6MAN <6man@ietf.or= g>;BIER WG <bier@ietf.org>;=E5=BC=A0=E5=BE=8100007940;
=E6=97= =A5 =E6=9C=9F =EF=BC=9A2020=E5=B9=B403=E6=9C=8825=E6=97=A5 08:36
<= div>=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: BIER in IPv6 --- draft-zhang= -bier-bierin6-04
Tony & Sand= y=C2=A0

So is the idea proposed in the two= drafts mentioned for BIER IPv6 support of encoding the BIER header up to 2= 56 bit mask for BFER encoding schema supporting up to I believe 128 BFERs p= er set - to encode the BIER header into the DO EH - =C2=A0and then for dire= ctly connected neighbor the outer header IPv6 encapsulation 1 hop tunnel us= ed link local source and destination - for non directly connected neighbors= IPv6 encapsulation use multi hop tunnel with GUI SA and DA.=C2=A0 In both = tunnel cases being mutually exclusive the link local tunnel would have TTL = 1 and multi hop would have appropriate =C2=A0>1 ttl.

So this is = 2 different solutions for 2 different use cases.=C2=A0 Correct?

[Sand= y]: Sorry. No. The two solutions are used to solve one use case. And there = is no relationship between the Bitstringlength in BIER header and the posit= ion in IPv6 header.

=C2=A0 =C2=A0 Gyan> Ok.=C2=A0 The one use case is for bei= ng able to tunnel over hardware not supporting BIER and so for that you hav= e the two tunnel options.=C2=A0 The two tunnel types are link local or GUA = and both are multi hop tunnels - Correct?=C2=A0

[Sandy2]: Yes. If you think they are all tunneling. :-)


Yes, critical po= int. We are _not_ "tunneling" in case of LL to LL BIERin6 in fact= for all practical purposes (tunnel assumes fragmentation/security etc whic= h BIER architecture does NOT presume from L2 header, we do not expect Ether= net to fragment or encrypt BIER). IPv6 is basically used the same way we us= e ethernet, it's poor man's "L2 header" that allows stand= ard, non-extended silicon to throw stuff to slow path to process if silicon= doesn't support BIER (will be reality for e.g. cheap WiFi routers for = ages to come I think). If silicon does support BIER fast path can be taken = as well with bierin6 but if silicon supports BIRE we have L2 encaps which a= rguably should be used rather than twisting ipv6.

=
BIER architecture uses unicast tunnels to get frames across parts of n= etwork without BIER support as well. Now, here the bierin6 is irresistibly = convienent to just stick a BFR prefix as destination and hop over routers w= ithout even signalling a tunnel and then it is a unicast tunnel from BIER p= erspective. Kind of like SR or SRv6 or MPLS tunnel (which need to be differ= ntatied from BIER running natively over MPLS labels) but for v6 no special = HW support is needed so that's neat ;-) SR/SRv6/IP forwarding/GRE are j= ust unicast tunnels to BIER.

--- tony

--000000000000d3d2e905a1c442db-- From nobody Thu Mar 26 11:44:34 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C992D3A07F6; Thu, 26 Mar 2020 11:44:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.65 X-Spam-Level: X-Spam-Status: No, score=-1.65 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id urlQ2Kaj3JPf; Thu, 26 Mar 2020 11:44:22 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 560003A079D; Thu, 26 Mar 2020 11:44:20 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 12752548433; Thu, 26 Mar 2020 19:44:15 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id 0B0FA440040; Thu, 26 Mar 2020 19:44:15 +0100 (CET) Date: Thu, 26 Mar 2020 19:44:15 +0100 From: Toerless Eckert To: Tony Przygienda Cc: "zhang.zheng" , BIER WG , 6MAN <6man@ietf.org>, Gyan Mishra Message-ID: <20200326184414.GA30139@faui48f.informatik.uni-erlangen.de> References: <202003261725503637966@zte.com.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] BIER in IPv6 --- draft-zhang-bier-bierin6-04 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2020 18:44:24 -0000 On Thu, Mar 26, 2020 at 09:11:16AM -0700, Tony Przygienda wrote: > Yes, critical point. We are _not_ "tunneling" in case of LL to LL BIERin6 > in fact for all practical purposes (tunnel assumes fragmentation/security > etc which BIER architecture does NOT presume from L2 header, we do not > expect Ethernet to fragment or encrypt BIER). When you say "We" your hat is that of a co-author ? Your definition of "tunnel" would be whenever you start to have to support fragmentation or encryption ? For example, in anima, we are doing single hop, link-local IPv6 IPsec encap. I avoided to use the word "tunnel" because i am not sure there is a clear definition of what properties of an encap constitutes a tunnel, but in IETF/IESG review folks often call this a tunnel. Do you know any authoritative RFC defining the word tunnel ? If there is no authoritative definition, maybe its better to stop using the name calling "tunnel" and stick to the properties of interest and compare them. E.g.: no fragmentation, no encryption desired/required. I think we agree on those desire/requirements to enable fast processing. I don't think we don't agree on a requirement that we should also be able to support going beyond that. In both solutions, whenever we do encap between two non subnet-connected BFR, we probably need to have some signaling or config based adjacency MTU mechanism if we want to avoid PMTUD. > IPv6 is basically used the > same way we use ethernet, it's poor man's "L2 header" that allows standard, > non-extended silicon to throw stuff to slow path to process if silicon > doesn't support BIER (will be reality for e.g. cheap WiFi routers for ages > to come I think). If silicon does support BIER fast path can be taken as > well with bierin6 but if silicon supports BIRE we have L2 encaps which > arguably should be used rather than twisting ipv6. See my prior emails i sent on my opinion that i think this property of supporting fast silicon processing would IMHO equally apply to both encaps. Of course, we still have to pass 6man for both approaches to see if they stick more (undesirable) complexitites on us. > BIER architecture uses unicast tunnels to get frames across parts of > network without BIER support as well. Now, here the bierin6 is irresistibly > convienent to just stick a BFR prefix as destination and hop over routers > without even signalling a tunnel and then it is a unicast tunnel from BIER > perspective. Kind of like SR or SRv6 or MPLS tunnel (which need to be > differntatied from BIER running natively over MPLS labels) but for v6 no > special HW support is needed so that's neat ;-) SR/SRv6/IP forwarding/GRE > are just unicast tunnels to BIER. given my inability to find authoritative definitions for tunnels, i was using terms like "remote adjacency" for these cases in other docs ;-) Cheers Toerless > --- tony > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier -- --- tte@cs.fau.de From nobody Thu Mar 26 12:07:40 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 07B023A0D6D; Thu, 26 Mar 2020 12:07:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EYGe1SKleiMo; Thu, 26 Mar 2020 12:07:24 -0700 (PDT) Received: from mail-il1-x12a.google.com (mail-il1-x12a.google.com [IPv6:2607:f8b0:4864:20::12a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 72D0D3A0E54; Thu, 26 Mar 2020 12:07:24 -0700 (PDT) Received: by mail-il1-x12a.google.com with SMTP id t11so6497590ils.1; Thu, 26 Mar 2020 12:07:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=6Rm3KLB6aCAYH2yxnXdjX1Kc1V/Fz4TW6gWPS+6Teyo=; b=u2ny2/PaIoUxo6MOgzr/GXrVgH2/oiBE844xsBRZt53JcPiJoRRzIwAp7pXwIaJnpe 0+cbb+/huqRw5wFD/I+PCQuJSZ9jnxDdzx51lh+NhXN2LvoVOWzq12ysZL8Nkg/zHHe9 395nzFrMLaSkdKT+++CylgLRHkw+WsW4sxGJDAsD1K3onDsdKEm8LdbPY2A4yJfErjY3 isqxyRUM3qijwizXQMdnpDFEwSX5QoBUv37rEo40ThcDBsDCHx/Ma4V3vsdLluNe5FEu EWDIbaMdzkaWlByzvtUMiLZP2A/tL/ydk2wiPXSdR4WgcEYVFhPYjH9oOQg7knfcgQJt 3GKA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=6Rm3KLB6aCAYH2yxnXdjX1Kc1V/Fz4TW6gWPS+6Teyo=; b=SPAOhTurycsMUnHsc4VA1Ee6jhFHwgozf+7rl16qTkI/gRjyTdjXiLa1aPCGgmrtVC 4eZiR1cH/JGYTlyAFozO0XrU0gBD6H4BsSBTw0RqgYhgXbP8FzTMVIgA6W1xcoZ+EqwV zU0yQJFjv/x2KblfyMObzFCFe8ee5iapzUh6yYClObXylpIEI2/iv5U10k8hWCLIYIt2 pIwKCGDuc6i9zMDTQwxT/oHKJL8481/vENm9Fs4099Ol74L3utJNLD8yr/1DoeSJ4+xP 6ZCFoQoPs2yCxjD1ytYW/ZOnfL4AcPuiJMgAmZ1/HmnDGM3f2BWrRELkPYDVx41urvmp gDvg== X-Gm-Message-State: ANhLgQ3TFA3nM7Qmask7eFnnIWb+RnqsEH187boxEGEhnRZBMz7Tm8Tm IrboQ/yp7r/jLg7hZwlClvQ7Qo7+z5dFvBjq4G8= X-Google-Smtp-Source: ADFU+vsudMYhDFqkn0oyZwASlJ7eCP9IsIklLcl+R1eEPqxoAy1i+n9WN6baTtwsjnQPInpts3JhhXacJBRTdAInm9U= X-Received: by 2002:a05:6e02:688:: with SMTP id o8mr9418624ils.156.1585249643735; Thu, 26 Mar 2020 12:07:23 -0700 (PDT) MIME-Version: 1.0 References: <202003261725503637966@zte.com.cn> <20200326184414.GA30139@faui48f.informatik.uni-erlangen.de> In-Reply-To: <20200326184414.GA30139@faui48f.informatik.uni-erlangen.de> From: Tony Przygienda Date: Thu, 26 Mar 2020 12:05:30 -0700 Message-ID: To: Toerless Eckert Cc: "zhang.zheng" , BIER WG , 6MAN <6man@ietf.org>, Gyan Mishra Content-Type: multipart/alternative; boundary="000000000000e55a6005a1c6b157" Archived-At: Subject: Re: [Bier] BIER in IPv6 --- draft-zhang-bier-bierin6-04 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2020 19:07:38 -0000 --000000000000e55a6005a1c6b157 Content-Type: text/plain; charset="UTF-8" On Thu, Mar 26, 2020 at 11:44 AM Toerless Eckert wrote: > On Thu, Mar 26, 2020 at 09:11:16AM -0700, Tony Przygienda wrote: > > Yes, critical point. We are _not_ "tunneling" in case of LL to LL BIERin6 > > in fact for all practical purposes (tunnel assumes fragmentation/security > > etc which BIER architecture does NOT presume from L2 header, we do not > > expect Ethernet to fragment or encrypt BIER). > > When you say "We" your hat is that of a co-author ? > > yepp, co-author of the original bierin6 draft obviously ... Asking in wider scope: while reading the rest of your email: are you implying that BIER WG should be in the busines of, as a previous commentator put it, inventing yet another L3-routed source-specific multicast tunneling technology? -- tony --000000000000e55a6005a1c6b157 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=
On Thu, Mar 26, 2020 at 11:44 AM Toer= less Eckert <tte@cs.fau.de> wrot= e:
On Thu, Mar 2= 6, 2020 at 09:11:16AM -0700, Tony Przygienda wrote:
> Yes, critical point. We are _not_ "tunneling" in case of LL = to LL BIERin6
> in fact for all practical purposes (tunnel assumes fragmentation/secur= ity
> etc which BIER architecture does NOT presume from L2 header, we do not=
> expect Ethernet to fragment or encrypt BIER).

When you say "We" your hat is that of a co-author ?


yepp, co-author of the original bierin= 6 draft obviously ...

Asking in wider scope: = while reading the rest of your email: are you implying that BIER WG should = be in the busines of, as a previous commentator put it, inventing yet anoth= er L3-routed source-specific multicast tunneling technology?

-- tony
--000000000000e55a6005a1c6b157-- From nobody Thu Mar 26 13:14:29 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5C45C3A09D9; Thu, 26 Mar 2020 13:13:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.87 X-Spam-Level: X-Spam-Status: No, score=-0.87 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id akyvYAquQR3D; Thu, 26 Mar 2020 13:13:57 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3D7F13A0C88; Thu, 26 Mar 2020 13:13:56 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 6716F548015; Thu, 26 Mar 2020 21:13:51 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id 5F3A7440040; Thu, 26 Mar 2020 21:13:51 +0100 (CET) Date: Thu, 26 Mar 2020 21:13:51 +0100 From: Toerless Eckert To: Tony Przygienda Cc: BIER WG , 6MAN <6man@ietf.org> Message-ID: <20200326201351.GB30139@faui48f.informatik.uni-erlangen.de> References: <202003261725503637966@zte.com.cn> <20200326184414.GA30139@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] BIER in IPv6 --- draft-zhang-bier-bierin6-04 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2020 20:14:16 -0000 On Thu, Mar 26, 2020 at 12:05:30PM -0700, Tony Przygienda wrote: > On Thu, Mar 26, 2020 at 11:44 AM Toerless Eckert wrote: > > > On Thu, Mar 26, 2020 at 09:11:16AM -0700, Tony Przygienda wrote: > > > Yes, critical point. We are _not_ "tunneling" in case of LL to LL BIERin6 > > > in fact for all practical purposes (tunnel assumes fragmentation/security > > > etc which BIER architecture does NOT presume from L2 header, we do not > > > expect Ethernet to fragment or encrypt BIER). > > > > When you say "We" your hat is that of a co-author ? > > > > > yepp, co-author of the original bierin6 draft obviously ... > > Asking in wider scope: while reading the rest of your email: are you > implying that BIER WG should be in the busines of, as a previous > commentator put it, inventing yet another L3-routed source-specific > multicast tunneling technology? Until i know what you're trying to imply with the word tunneling, i have to guess ... lets simply talk about the properties we want/do-not-want. The BIER architecture RFC very nicely points to the fact how BIER can automatically determine remote neighbors to hop over non-BIER enabled routers. Benefit of relying on the IGP. I think it would nice if this can be leveraged in our IPv6 solution, but it only makes sense if we can reasonably expect that a good amount of devices can do this in the "fast-path" like hop-by-hop. I think thats possible with both drafts. I am not persuased that link-local encap+decap on every hop is faster in HW data-plane than rewriting IPv6 header elements. I have seem many forwarding planes where encap/decap would cause recycling. Functionally, the main difference between the drafts IMHO is that Xie's draft uses the IPv6 header to carry VPN info, whereas i do not understand how we would do this in Sandy's draft. Cheers Toerless > -- tony > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- -- --- tte@cs.fau.de From nobody Thu Mar 26 18:52:20 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C760F3A077D; Thu, 26 Mar 2020 18:51:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vIT9gYfU66AM; Thu, 26 Mar 2020 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with mapi id 15.01.1713.004; Fri, 27 Mar 2020 09:51:27 +0800 From: "Xiejingrong (Jingrong)" To: Tony Przygienda CC: BIER WG , 6MAN <6man@ietf.org> Thread-Topic: BIER in IPv6 --- draft-zhang-bier-bierin6-04 Thread-Index: AQHWA4mbmNydruukO0evntKrq06wOahbrJfg Date: Fri, 27 Mar 2020 01:51:27 +0000 Message-ID: References: <202003261725503637966@zte.com.cn> In-Reply-To: Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.202.118] Content-Type: multipart/alternative; boundary="_000_eccf884af2214582ae53a407a294e089huaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Bier] BIER in IPv6 --- draft-zhang-bier-bierin6-04 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Mar 2020 01:51:54 -0000 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--_000_eccf884af2214582ae53a407a294e089huaweicom_-- From nobody Thu Mar 26 20:11:06 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 146CC3A0778 for ; Thu, 26 Mar 2020 20:11:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id czhxgwyFd1aJ for ; Thu, 26 Mar 2020 20:11:02 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 64D4A3A076E for ; Thu, 26 Mar 2020 20:11:02 -0700 (PDT) Received: from lhreml706-cah.china.huawei.com (unknown [172.18.7.106]) by Forcepoint Email with ESMTP id 1F9A99F0E317C59A4DA2; Fri, 27 Mar 2020 03:11:01 +0000 (GMT) Received: from nkgeml708-chm.china.huawei.com (10.98.57.160) by lhreml706-cah.china.huawei.com (10.201.108.47) with Microsoft SMTP Server (TLS) id 14.3.408.0; Fri, 27 Mar 2020 03:11:00 +0000 Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by nkgeml708-chm.china.huawei.com (10.98.57.160) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Fri, 27 Mar 2020 11:10:52 +0800 Received: from nkgeml705-chm.china.huawei.com ([10.98.57.154]) by nkgeml705-chm.china.huawei.com ([10.98.57.154]) with mapi id 15.01.1713.004; Fri, 27 Mar 2020 11:10:52 +0800 From: "Xiejingrong (Jingrong)" To: "gjshep@gmail.com" , BIER WG Thread-Topic: [Bier] Fwd: Bit Indexed Explicit Replication (bier) WG Virtual Meeting: 2020-04-14 Thread-Index: AQHWA4VQaeo/BdKFzkaGHFBgXuL7jKhbwgIg Date: Fri, 27 Mar 2020 03:10:51 +0000 Message-ID: <4c7465b189e04721812df223bbc8bc38@huawei.com> References: <158516830800.31199.11452341577544756857@ietfa.amsl.com> In-Reply-To: Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.202.118] Content-Type: multipart/alternative; boundary="_000_4c7465b189e04721812df223bbc8bc38huaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Bier] Fwd: Bit Indexed Explicit Replication (bier) WG Virtual Meeting: 2020-04-14 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Mar 2020 03:11:04 -0000 --_000_4c7465b189e04721812df223bbc8bc38huaweicom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 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On Tue, 24 Mar 2020, 06:43 Brian E Carpenter, <brian.e.carpenter@gmail.com&= gt; wrote:
Hi Xuesong,

>=C2=A0 link-local forwarding concerns

What are those concerns? Link-local forwarding is forbidden by RFC4291 and = any router that performs it is completely faulty and should be thrown away.=

=
Actually, forwarding is allowed by RFC 4007, bu= t only back onto the same link.


For the BIER scenario, link-local seems very suitable.

Sounds like I'd a= gree, just haven't read the ID.

Packets with ULA or GUA DAs and LL SAs have been seen to leak o= ff link. Those implementations a missing an RPF like check on LL SAs. The s= ending hosts shouldn't really be sending those packets in the first pla= ce.

There's always a= risk of bugs or non-compliant implementations, which is why Postel's l= aw exists.

(Wouldn't= it be great if a "Implementations MUST be bug free." statement i= n an RFC was complied with 100%!)

Regards,
Mark.

=


Regards
=C2=A0 =C2=A0Brian Carpenter

On 23-Mar-20 19:27, Gengxuesong (Geng Xuesong) wrote:
> Hi,
>
> =C2=A0
>
> Thank you for your prompt response, and giving your considerations abo= ut these two methods.
>
> I notice that you mentioned:
>
>>>this has a nice side effect of allowing to "jump over non-= BIER routers" if addressed to bier prefix
>
> So would this method be the preferred one to cover more scenarios ? >
> It seems to me that 2 different methods may need more technical consid= erations for both of them, such as , link-local forwarding concerns for opt= ion 1 and global-address security concerns for option 2.
>
> =C2=A0
>
> Best Regards
>
> Xuesong
>
> =C2=A0
>
> *From:*Tony Przygienda [mailto:tonysietf@gmail.com]
> *Sent:* Monday, March 23, 2020 11:21 AM
> *To:* zhang.zheng <zhang.zheng@zte.com.cn>
> *Cc:* Gengxuesong (Geng Xuesong) <gengxuesong@huawei.com>= ;; 6MAN <6man@ietf.org>; BIER WG <bier@ietf.org>
> *Subject:* Re: BIER in IPv6 --- draft-zhang-bier-bierin6-04
>
> =C2=A0
>
> That's a currently ongoing discussions between the auhtors (cc:= 9;ing bier as well)
>
> =C2=A0
>
> LL has advantages
>
> * the packet cannot "escape" even if it has TTL > 1
>
> * such a scheme can work purely with ND
>
> * it's hard to "send out the wrong interface" albeit v6 = allows AFAIR to have same link local on multiple interfaces
>
> =C2=A0
>
> Originally the draft did not even allow for global addressing (since w= e want to use v6 as L2-substitute here just like MPLS & non-MPLS encaps= ulations are used in BIER) but this has a nice side effect of allowing to &= quot;jump over non-BIER routers" if addressed to bier prefix (which I = personally think should be the only allowed global v6 used, otherwise we ma= y end up with BIER frames in funky places and possible "holes" in= the replication fabric). Obviously strictly speaking it's not necessar= y since BIER can be carried in plethora of normal unicast tunnels=C2=A0 but= bunch of co-auhtors joined and the consensus was to allow it
>
> =C2=A0
>
> --- tony
>
> =C2=A0
>
> =C2=A0
>
> =C2=A0
>
> On Sun, Mar 22, 2020 at 8:15 PM <zhang.zheng@zte.com.cn <= ;mailto:zhang.zheng@zte.com.cn>> wrote:
>
>=C2=A0 =C2=A0 =C2=A0Hi Xuesong,
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0Thank you for your question!
>
>=C2=A0 =C2=A0 =C2=A0The LL address is used by direct connected neighbor= .
>
>=C2=A0 =C2=A0 =C2=A0For the neighbor which is not direct connected, the= wider range address should be used.
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0Thanks,
>
>=C2=A0 =C2=A0 =C2=A0Sandy
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>
>=C2=A0 =C2=A0 =C2=A0*=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*Gengxuesong(G= engXuesong) <gengxuesong@huawei.com <mailto:gengxuesong@h= uawei.com>>
>
>=C2=A0 =C2=A0 =C2=A0*=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E5=BC=A0=E5= =BE=8100007940;6man@ietf.org <mailto:6man@ietf.org> <6man@ietf= .org <mailto:6man@ietf.org>>;
>
>=C2=A0 =C2=A0 =C2=A0*=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6= =9C=8823=E6=97=A511:03
>
>=C2=A0 =C2=A0 =C2=A0*=E4=B8=BB =E9=A2=98 =EF=BC=9ARE: Re:BIER in IPv6 -= -- draft-zhang-bier-bierin6-04*
>
>=C2=A0 =C2=A0 =C2=A0Hi Sandy and authors of draft-zhang-bier-bierin6: >
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0I have some questions about the section 2 when read= ing the draft. It is mentioned that:
>
>=C2=A0 =C2=A0 =C2=A0=E2=80=9CIf... The destination address in IPv6 head= er SHOULD be the neighbor's link-local address.
>
>=C2=A0 =C2=A0 =C2=A0Otherwise... the destination address SHOULD be the = BIER prefix of the BFR neighbor.=E2=80=9D
>
>=C2=A0 =C2=A0 =C2=A0Seems like the draft proposes 2 methods of IPv6 hea= der encapsulation.
>
>=C2=A0 =C2=A0 =C2=A0Could these 2 methods be combined ? If not, what= 9;s the use case and design consideration for each method?
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0Best Regards
>
>=C2=A0 =C2=A0 =C2=A0Xuesong
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0*From:*ipv6 [mailto:ipv6-bounces@ietf.org &l= t;mailto:ipv6-bounces@ietf.org>]*On Behalf Of *zhang.zheng@zt= e.com.cn <mailto:zhang.zheng@zte.com.cn>
>=C2=A0 =C2=A0 =C2=A0*Sent:* Saturday, March 21, 2020 1:43 PM
>=C2=A0 =C2=A0 =C2=A0*To:* 6man@ietf.org <mailto:6man@ietf.org>
>=C2=A0 =C2=A0 =C2=A0*Subject:* Re:BIER in IPv6 --- draft-zhang-bier-bie= rin6-04
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0Hi,
>
>=C2=A0 =C2=A0 =C2=A0As co-author of BIERin6 (draft-zhang-bier-bierin6-0= 4), before you read the draft, please let me introduce BIER technology to y= ou at first:
>
>=C2=A0 =C2=A0 =C2=A0BIER technology, as defined in RFC8279, it's a = new multicast technology. The principle is achieving multicast forwarding b= y hop-by-hop execution.
>
>=C2=A0 =C2=A0 =C2=A0BIER is a transport protocol, not just a function. = As defined in RFC8296, BIER has it's own ethernet encapsulation with et= hernet type 0xAB37, and also it can be travelled by MPLS encapsulation.
>
>=C2=A0 =C2=A0 =C2=A0BIER has it's own OAM function, ECMP function a= nd traceability. etc. through BIER header defined in RFC8296.
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0For travelling through IPv6 only enviroment, we'= ;d like to travel BIER packet by IPv6 encapsulation.
>
>=C2=A0 =C2=A0 =C2=A0In draft-zhang-bier-bierin6-04, we want to just use= a new Next Header type for BIER header carrying.
>
>=C2=A0 =C2=A0 =C2=A0We want to bring the minimum impact on IPv6 existed= execution, and the maximum flexibility for header interoperability.
>
>=C2=A0 =C2=A0 =C2=A0So if you have any question about draft-zhang-bier-= bierin6-04, or about BIER technology itself, please tell me. I'am glad = to explain them to you.
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0Thanks,
>
>=C2=A0 =C2=A0 =C2=A0Sandy
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>
>=C2=A0 =C2=A0 =C2=A0*=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*TonyPrzygiend= a <tonysietf@gmail.com <mailto:tonysietf@gmail.com>><= br> >
>=C2=A0 =C2=A0 =C2=A0*=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*Michael McBri= de <michael.mcbride@futurewei.com <mailto:m= ichael.mcbride@futurewei.com>>;
>
>=C2=A0 =C2=A0 =C2=A0*=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*6man@ietf.org = <mailto:6man@ietf.org> <6man@ietf.org <mailto:6man@ietf.org>>= ;;
>
>=C2=A0 =C2=A0 =C2=A0*=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6= =9C=8819=E6=97=A501:12
>
>=C2=A0 =C2=A0 =C2=A0*=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: BIER in IPv6*
>
>=C2=A0 =C2=A0 =C2=A0---------------------------------------------------= -----------------
>=C2=A0 =C2=A0 =C2=A0IETF=C2=A0IPv6=C2=A0working=C2=A0group=C2=A0mailing= =C2=A0list
>=C2=A0 =C2=A0 =C2=A0ipv6@ietf.org <mailto:ipv6@ietf.org>
>=C2=A0 =C2=A0 =C2=A0Administrative=C2=A0Requests:=C2=A0https://www.ietf.org/mailman/listinfo/ipv6
>=C2=A0 =C2=A0 =C2=A0---------------------------------------------------= -----------------
>
>=C2=A0 =C2=A0 =C2=A0<BIER WG chair hat on>
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0The specific ask here is for the 6man to look over = both drafts, i.e.
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0draft-zhang-bier-bierin6
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0and
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0draft-xie-bier-ipv6-encapsulation
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0and verify whether they conform to published IPv6 s= tandards or raise objections/concerns.
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0The requirements document is currently under active= work/comments and does not represent any final or wide-consensus state so = an opinion on its state is appreciated but it should not be used as any fin= al or binding list of requirements as to the targeted solution in BIER WG >
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0thanks
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0--- tony
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0On Tue, Mar 17, 2020 at 9:20 PM Michael McBride <= ;michael.mcbride@futurewei.com <mailto:michael= .mcbride@futurewei.com>> wrote:
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hello,
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The bier wg could use your ipv6 recom= mendations. We=E2=80=99ve worked on various solutions to transport a bier h= eader in ipv6. We decided to pause and create a requirements document (draf= t-ietf-bier-ipv6-requirements) to help steer us towards the right solution(= s). In that drafts appendix we have a fairly good summary of the various so= lutions.
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0We=E2=80=99ve started to rally behind= two solutions which meet the majority of the requirements: draft-xie-bier-= ipv6-encapsulation (bier header in ipv6 EH) and draft-zhang-bier-bierin6 (b= ier header as payload using ipv6 NH). The bier chairs today asked to punt t= he bierv6 topic to 6man for advice before adopting any of these solutions.<= br> >
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0So here we are seeking your advice. T= he most simple approach would probably be to give =C2=A0https://datatracker.ietf.org/doc/draft-ie= tf-bier-ipv6-requirements/ a look and scroll down to the appendix to se= e a summary of the various solutions we=E2=80=99ve been considering.
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0thanks!
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0mike
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0-------------------------------------= -------------------------------
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0IETF IPv6 working group mailing list<= br> >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ipv6@ietf.org <mailto:ipv6@ietf.org&= gt;
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0-------------------------------------= -------------------------------
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0=C2=A0
>
>=C2=A0 =C2=A0 =C2=A0---------------------------------------------------= -----------------
>=C2=A0 =C2=A0 =C2=A0IETF IPv6 working group mailing list
>=C2=A0 =C2=A0 =C2=A0ipv6@ietf.org <mailto:ipv6@ietf.org>
>=C2=A0 =C2=A0 =C2=A0Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
>=C2=A0 =C2=A0 =C2=A0---------------------------------------------------= -----------------
>
>
> -------------------------------------------------------------------- > IETF IPv6 working group mailing list
> = ipv6@ietf.org
> Administrative Requests: https://www.ietf.= org/mailman/listinfo/ipv6
> -------------------------------------------------------------------- >

--------------------------------------------------------------------
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ipv6@= ietf.org
Administrative Requests: https://www.ietf.org/m= ailman/listinfo/ipv6
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--000000000000d74f6f05a18b32bc-- From nobody Mon Mar 23 14:57:00 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 902683A0F38; Mon, 23 Mar 2020 14:56:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4itv-DtYc97n; Mon, 23 Mar 2020 14:56:21 -0700 (PDT) Received: from mail-pf1-x430.google.com (mail-pf1-x430.google.com [IPv6:2607:f8b0:4864:20::430]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 686E93A0F45; Mon, 23 Mar 2020 14:56:21 -0700 (PDT) Received: by mail-pf1-x430.google.com with SMTP id u68so8197189pfb.2; Mon, 23 Mar 2020 14:56:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=NdWrKuiFdH2bHNhf78qe35E2lfDUA838aJEpuYNY1g8=; b=llwx4HyfQN32IKKv/yXDsi8Iki6CWUC7Psdd/xeI1K98zS0HsmXpLTZA4e8qLPJ+QU M7J48MCkuw1M5II88fZ4pkL8TS2RG0ZUu7UqZyDHyyABgB7on17y5Ogw9Sl18swK1fby J51QWzv7BTUKnOZh5YgnZZUT+O8MX/1F0B0iECLZ22AMWfPHeQpkQNrRK7ilTIPNBvfN Y9avT0sHUAodOy6LrYBjTbTikZRKy+KB3azMbYQQ8JDZj3OwS8oYvrnHDmfD+lsNWA09 bC/kVifKhzsjwqsJk6TTFbjr9zEdjZrAwNxNZObxC+84Gk3RzznJ/mfgdtcBLLIA/eFF 0PdA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=NdWrKuiFdH2bHNhf78qe35E2lfDUA838aJEpuYNY1g8=; b=q9JbUmQJPzjtErm8DsrTjGFnWgvJR0hgmKJl/D1VJdLUdHAzfaqAdx3wve9BL783Q8 ntgbyQLZ6AzoCHA+4Er07V+VEpdTQspSRzR9/jCvMKcaTxTfy9aw0rk5/jYS+o0I4xy1 tZPBl9RYgc0DvWXGt5Vj4+zcU0e+qoYRVhnmWyytN161kOamzUKWKO6DOOjALunfJ0jl 75U1P7p8rsUK8y4NKhnl0TxB73TXneZry9mTNivihGKkUNPyuf9YgHnHS1aLeWaCBcA+ weZJqTiccy4od5edczrRQeJUMOvljJSdarbPb6ruWsJen3WGVZAx/wPm9w3BpUUsfiE9 mtcg== X-Gm-Message-State: ANhLgQ0zIQnRuuFKCvOjI3r6e9PuO9u2KayI2IAtFDcNEF6LAyhCVtiX eOiBPYy65qeSQmPIyYr52PTRW8wl X-Google-Smtp-Source: ADFU+vsxHqQ97+tHGyDDWBCVQMWSCF2g8rFbUI8Ck64w7kFK5X8/xuLZxKgYW3RIaX0mRLH/F3nUiQ== X-Received: by 2002:a63:584c:: with SMTP id i12mr23417217pgm.276.1585000580484; Mon, 23 Mar 2020 14:56:20 -0700 (PDT) Received: from [192.168.178.30] ([165.84.25.143]) by smtp.gmail.com with ESMTPSA id nk12sm493931pjb.41.2020.03.23.14.56.17 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 23 Mar 2020 14:56:19 -0700 (PDT) To: Mark Smith Cc: "Gengxuesong (Geng Xuesong)" , Tony Przygienda , "zhang.zheng" , 6MAN <6man@ietf.org>, BIER WG References: <0aaf9a4e017643af85cd246b04d1858c@huawei.com> <202003231114061611017@zte.com.cn> <45db7d3141664b08a2832020829326c1@huawei.com> <24f852f6-80df-b16f-6c3d-24be30373923@gmail.com> From: Brian E Carpenter Message-ID: Date: Tue, 24 Mar 2020 10:56:15 +1300 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [Bier] BIER in IPv6 --- draft-zhang-bier-bierin6-04 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Mar 2020 21:56:52 -0000 On 24-Mar-20 09:08, Mark Smith wrote: >=20 >=20 > On Tue, 24 Mar 2020, 06:43 Brian E Carpenter, > wrote: >=20 > Hi Xuesong, >=20 > >=C2=A0 link-local forwarding concerns >=20 > What are those concerns? Link-local forwarding is forbidden by RFC4= 291 and any router that performs it is completely faulty and should be th= rown away. >=20 >=20 >=20 > Actually, forwarding is allowed by RFC 4007, but only back onto the sam= e link. Sure, which is fine of course. RFC4291 governs this, saying: Routers must not forward any packets with Link-Local source or destination addresses to other links. which does not forbid forwarding to the *same* link. Brian >=20 >=20 > For the BIER scenario, link-local seems very suitable. >=20 >=20 > Sounds like I'd agree, just haven't read the ID. >=20 > Packets with ULA or GUA DAs and LL SAs have been seen to leak off link.= Those implementations a missing an RPF like check on LL SAs. The sending= hosts shouldn't really be sending those packets in the first place. >=20 > There's always a risk of bugs or non-compliant implementations, which i= s why Postel's law exists. >=20 > (Wouldn't it be great if a "Implementations MUST be bug free." statemen= t in an RFC was complied with 100%!) >=20 > Regards, > Mark. >=20 >=20 >=20 > Regards > =C2=A0 =C2=A0Brian Carpenter >=20 > On 23-Mar-20 19:27, Gengxuesong (Geng Xuesong) wrote: > > Hi, > > > > =C2=A0 > > > > Thank you for your prompt response, and giving your consideration= s about these two methods. > > > > I notice that you mentioned: > > > >>>this has a nice side effect of allowing to "jump over non-BIER r= outers" if addressed to bier prefix > > > > So would this method be the preferred one to cover more scenarios= ? > > > > It seems to me that 2 different methods may need more technical c= onsiderations for both of them, such as , link-local forwarding concerns = for option 1 and global-address security concerns for option 2. > > > > =C2=A0 > > > > Best Regards > > > > Xuesong > > > > =C2=A0 > > > > *From:*Tony Przygienda [mailto:tonysietf@gmail.com ] > > *Sent:* Monday, March 23, 2020 11:21 AM > > *To:* zhang.zheng > > > *Cc:* Gengxuesong (Geng Xuesong) >; 6MAN <6man@ietf.org >; BI= ER WG > > > *Subject:* Re: BIER in IPv6 --- draft-zhang-bier-bierin6-04 > > > > =C2=A0 > > > > That's a currently ongoing discussions between the auhtors (cc:'i= ng bier as well) > > > > =C2=A0 > > > > LL has advantages > > > > * the packet cannot "escape" even if it has TTL > 1 > > > > * such a scheme can work purely with ND > > > > * it's hard to "send out the wrong interface" albeit v6 allows AF= AIR to have same link local on multiple interfaces > > > > =C2=A0 > > > > Originally the draft did not even allow for global addressing (si= nce we want to use v6 as L2-substitute here just like MPLS & non-MPLS enc= apsulations are used in BIER) but this has a nice side effect of allowing= to "jump over non-BIER routers" if addressed to bier prefix (which I per= sonally think should be the only allowed global v6 used, otherwise we may= end up with BIER frames in funky places and possible "holes" in the repl= ication fabric). Obviously strictly speaking it's not necessary since BIE= R can be carried in plethora of normal unicast tunnels=C2=A0 but bunch of= co-auhtors joined and the consensus was to allow it > > > > =C2=A0 > > > > --- tony > > > > =C2=A0 > > > > =C2=A0 > > > > =C2=A0 > > > > On Sun, Mar 22, 2020 at 8:15 PM >> wrote: > > > >=C2=A0 =C2=A0 =C2=A0Hi Xuesong, > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0Thank you for your question! > > > >=C2=A0 =C2=A0 =C2=A0The LL address is used by direct connected nei= ghbor. > > > >=C2=A0 =C2=A0 =C2=A0For the neighbor which is not direct connected= , the wider range address should be used. > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0Thanks, > > > >=C2=A0 =C2=A0 =C2=A0Sandy > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 > > > >=C2=A0 =C2=A0 =C2=A0*=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*Gengxues= ong(GengXuesong) = >> > > > >=C2=A0 =C2=A0 =C2=A0*=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E5=BC=A0= =E5=BE=8100007940;6man@ietf.org > <6man@ietf.org >>; > > > >=C2=A0 =C2=A0 =C2=A0*=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403= =E6=9C=8823=E6=97=A511:03 > > > >=C2=A0 =C2=A0 =C2=A0*=E4=B8=BB =E9=A2=98 =EF=BC=9ARE: Re:BIER in I= Pv6 --- draft-zhang-bier-bierin6-04* > > > >=C2=A0 =C2=A0 =C2=A0Hi Sandy and authors of draft-zhang-bier-bieri= n6: > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0I have some questions about the section 2 when= reading the draft. It is mentioned that: > > > >=C2=A0 =C2=A0 =C2=A0=E2=80=9CIf... The destination address in IPv6= header SHOULD be the neighbor's link-local address. > > > >=C2=A0 =C2=A0 =C2=A0Otherwise... the destination address SHOULD be= the BIER prefix of the BFR neighbor.=E2=80=9D > > > >=C2=A0 =C2=A0 =C2=A0Seems like the draft proposes 2 methods of IPv= 6 header encapsulation. > > > >=C2=A0 =C2=A0 =C2=A0Could these 2 methods be combined ? If not, wh= at's the use case and design consideration for each method? > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0Best Regards > > > >=C2=A0 =C2=A0 =C2=A0Xuesong > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0*From:*ipv6 [mailto:ipv6-bounces@ietf.org >]*On Behalf Of *zhang.zheng@zte.com.cn > > >=C2=A0 =C2=A0 =C2=A0*Sent:* Saturday, March 21, 2020 1:43 PM > >=C2=A0 =C2=A0 =C2=A0*To:* 6man@ietf.org > > >=C2=A0 =C2=A0 =C2=A0*Subject:* Re:BIER in IPv6 --- draft-zhang-bie= r-bierin6-04 > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0Hi, > > > >=C2=A0 =C2=A0 =C2=A0As co-author of BIERin6 (draft-zhang-bier-bier= in6-04), before you read the draft, please let me introduce BIER technolo= gy to you at first: > > > >=C2=A0 =C2=A0 =C2=A0BIER technology, as defined in RFC8279, it's a= new multicast technology. The principle is achieving multicast forwardin= g by hop-by-hop execution. > > > >=C2=A0 =C2=A0 =C2=A0BIER is a transport protocol, not just a funct= ion. As defined in RFC8296, BIER has it's own ethernet encapsulation with= ethernet type 0xAB37, and also it can be travelled by MPLS encapsulation= =2E > > > >=C2=A0 =C2=A0 =C2=A0BIER has it's own OAM function, ECMP function = and traceability. etc. through BIER header defined in RFC8296. > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0For travelling through IPv6 only enviroment, w= e'd like to travel BIER packet by IPv6 encapsulation. > > > >=C2=A0 =C2=A0 =C2=A0In draft-zhang-bier-bierin6-04, we want to jus= t use a new Next Header type for BIER header carrying. > > > >=C2=A0 =C2=A0 =C2=A0We want to bring the minimum impact on IPv6 ex= isted execution, and the maximum flexibility for header interoperability.= > > > >=C2=A0 =C2=A0 =C2=A0So if you have any question about draft-zhang-= bier-bierin6-04, or about BIER technology itself, please tell me. I'am gl= ad to explain them to you. > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0Thanks, > > > >=C2=A0 =C2=A0 =C2=A0Sandy > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 > > > >=C2=A0 =C2=A0 =C2=A0*=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*TonyPrzy= gienda >> > > > >=C2=A0 =C2=A0 =C2=A0*=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*Michael = McBride >>; > > > >=C2=A0 =C2=A0 =C2=A0*=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*6man@iet= f.org = > <6man@ietf.org >>; > > > >=C2=A0 =C2=A0 =C2=A0*=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403= =E6=9C=8819=E6=97=A501:12 > > > >=C2=A0 =C2=A0 =C2=A0*=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: BIER in IPv6= * > > > >=C2=A0 =C2=A0 =C2=A0----------------------------------------------= ---------------------- > >=C2=A0 =C2=A0 =C2=A0IETF=C2=A0IPv6=C2=A0working=C2=A0group=C2=A0ma= iling=C2=A0list > >=C2=A0 =C2=A0 =C2=A0ipv6@ietf.org > > >=C2=A0 =C2=A0 =C2=A0Administrative=C2=A0Requests:=C2=A0https://www= =2Eietf.org/mailman/listinfo/ipv6 > >=C2=A0 =C2=A0 =C2=A0----------------------------------------------= ---------------------- > > > >=C2=A0 =C2=A0 =C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0The specific ask here is for the 6man to look = over both drafts, i.e. > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0draft-zhang-bier-bierin6 > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0and > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0draft-xie-bier-ipv6-encapsulation > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0and verify whether they conform to published I= Pv6 standards or raise objections/concerns. > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0The requirements document is currently under a= ctive work/comments and does not represent any final or wide-consensus st= ate so an opinion on its state is appreciated but it should not be used a= s any final or binding list of requirements as to the targeted solution i= n BIER WG > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0thanks > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0--- tony > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0On Tue, Mar 17, 2020 at 9:20 PM Michael McBrid= e <= mailto:michael.mcbride@futurewei.com >> wrote: > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hello, > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The bier wg could use your ipv6 = recommendations. We=E2=80=99ve worked on various solutions to transport a= bier header in ipv6. We decided to pause and create a requirements docum= ent (draft-ietf-bier-ipv6-requirements) to help steer us towards the righ= t solution(s). In that drafts appendix we have a fairly good summary of t= he various solutions. > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0We=E2=80=99ve started to rally b= ehind two solutions which meet the majority of the requirements: draft-xi= e-bier-ipv6-encapsulation (bier header in ipv6 EH) and draft-zhang-bier-b= ierin6 (bier header as payload using ipv6 NH). The bier chairs today aske= d to punt the bierv6 topic to 6man for advice before adopting any of thes= e solutions. > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0So here we are seeking your advi= ce. The most simple approach would probably be to give =C2=A0https://data= tracker.ietf.org/doc/draft-ietf-bier-ipv6-requirements/ a look and scroll= down to the appendix to see a summary of the various solutions we=E2=80=99= ve been considering. > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0thanks! > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0mike > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0--------------------------------= ------------------------------------ > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0IETF IPv6 working group mailing = list > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ipv6@ietf.org > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Administrative Requests: https:/= /www.ietf.org/mailman/listinfo/ipv6 > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0--------------------------------= ------------------------------------ > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0=C2=A0 > > > >=C2=A0 =C2=A0 =C2=A0----------------------------------------------= ---------------------- > >=C2=A0 =C2=A0 =C2=A0IETF IPv6 working group mailing list > >=C2=A0 =C2=A0 =C2=A0ipv6@ietf.org > > >=C2=A0 =C2=A0 =C2=A0Administrative Requests: https://www.ietf.org/= mailman/listinfo/ipv6 > >=C2=A0 =C2=A0 =C2=A0----------------------------------------------= ---------------------- > > > > > > -----------------------------------------------------------------= --- > > IETF IPv6 working group mailing list > > ipv6@ietf.org > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ip= v6 > > -----------------------------------------------------------------= --- > > >=20 > -------------------------------------------------------------------= - > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6= > -------------------------------------------------------------------= - >=20 From nobody Tue Mar 24 17:36:38 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B59BF3A0939; 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Tue, 24 Mar 2020 17:36:04 -0700 (PDT) MIME-Version: 1.0 References: <0aaf9a4e017643af85cd246b04d1858c@huawei.com> <202003231114061611017@zte.com.cn> In-Reply-To: From: Gyan Mishra Date: Tue, 24 Mar 2020 20:35:53 -0400 Message-ID: To: Tony Przygienda Cc: 6MAN <6man@ietf.org>, BIER WG , "zhang.zheng" Content-Type: multipart/alternative; boundary="000000000000a8a36805a1a30d10" Archived-At: Subject: Re: [Bier] BIER in IPv6 --- draft-zhang-bier-bierin6-04 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Mar 2020 00:36:27 -0000 --000000000000a8a36805a1a30d10 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Tony & Sandy So is the idea proposed in the two drafts mentioned for BIER IPv6 support of encoding the BIER header up to 256 bit mask for BFER encoding schema supporting up to I believe 128 BFERs per set - to encode the BIER header into the DO EH - and then for directly connected neighbor the outer header IPv6 encapsulation 1 hop tunnel used link local source and destination - for non directly connected neighbors IPv6 encapsulation use multi hop tunnel with GUI SA and DA. In both tunnel cases being mutually exclusive the link local tunnel would have TTL 1 and multi hop would have appropriate >1 ttl. So this is 2 different solutions for 2 different use cases. Correct? Just as with BIER IPv4 with BIER IPv6, the IGP extensions would flood the BIER info to build BIFT forwarding table to build the stateless MDT trees. In the case of SRv6 with disjoint BIER where traffic steering is required to signal SRV6 topology the last header would be set to TBD. So that last header would in non SRv6 IPv6 topology the Last header would be the DO EH with the BIER header encoded. So with SRv6 how is the BIER header encoded? For SRv6 support I am guessing we have to update the programming draft for an end type sid instantiation flavor variation for a new BIER SID? I am just thinking comparing BIER for v4 to BIER for v6 is there any way you could accomplish the same with v6 and not do any IPv6 tunneling and just add the L 2 1/2 BIER header and propagate the BIER header info into the IGP to build the BIFT forwarding table just as you do with BIER v4. I can see for egress node BFER support the intermediate nodes and maybe even end node may not have to support BIER - but now if tunneling is used. Is that the business justification for tunneling or maybe some other reason intrinsic to IPv6 I am missing. Am I totally off base?? Gyan On Sun, Mar 22, 2020 at 11:24 PM Tony Przygienda wrote: > That's a currently ongoing discussions between the auhtors (cc:'ing bier > as well) > > LL has advantages > * the packet cannot "escape" even if it has TTL > 1 > * such a scheme can work purely with ND > * it's hard to "send out the wrong interface" albeit v6 allows AFAIR to > have same link local on multiple interfaces > > Originally the draft did not even allow for global addressing (since we > want to use v6 as L2-substitute here just like MPLS & non-MPLS > encapsulations are used in BIER) but this has a nice side effect of > allowing to "jump over non-BIER routers" if addressed to bier prefix (whi= ch > I personally think should be the only allowed global v6 used, otherwise w= e > may end up with BIER frames in funky places and possible "holes" in the > replication fabric). Obviously strictly speaking it's not necessary since > BIER can be carried in plethora of normal unicast tunnels but bunch of > co-auhtors joined and the consensus was to allow it > > --- tony > > > > On Sun, Mar 22, 2020 at 8:15 PM wrote: > >> Hi Xuesong, >> >> >> Thank you for your question! >> >> The LL address is used by direct connected neighbor. >> >> For the neighbor which is not direct connected, the wider range address >> should be used. >> >> >> Thanks, >> >> Sandy >> >> >> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 >> > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*Gengxuesong(GengXuesong) >> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E5=BC=A0=E5=BE=8100007940;6man@ie= tf.org <6man@ietf.org>; >> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8823=E6=97=A5 11:03 >> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**RE: Re:BIER in IPv6 --- draft-zhang-bier= -bierin6-04* >> > Hi Sandy and authors of draft-zhang-bier-bierin6: >> >> >> >> I have some questions about the section 2 when reading the draft. It is >> mentioned that: >> >> =E2=80=9CIf... The destination address in IPv6 header SHOULD be the neig= hbor's >> link-local address. >> >> Otherwise... the destination address SHOULD be the BIER prefix of the BF= R >> neighbor.=E2=80=9D >> >> Seems like the draft proposes 2 methods of IPv6 header encapsulation. >> >> Could these 2 methods be combined ? If not, what's the use case and >> design consideration for each method? >> >> >> >> Best Regards >> >> Xuesong >> >> >> >> >> >> >> >> *From:* ipv6 [mailto:ipv6-bounces@ietf.org]*On Behalf Of * >> zhang.zheng@zte.com.cn >> *Sent:* Saturday, March 21, 2020 1:43 PM >> *To:* 6man@ietf.org >> *Subject:* Re:BIER in IPv6 --- draft-zhang-bier-bierin6-04 >> >> >> > Hi, >> >> As co-author of BIERin6 (draft-zhang-bier-bierin6-04), before you read >> the draft, please let me introduce BIER technology to you at first: >> >> BIER technology, as defined in RFC8279, it's a new multicast technology. >> The principle is achieving multicast forwarding by hop-by-hop execution. >> >> BIER is a transport protocol, not just a function. As defined in RFC8296= , >> BIER has it's own ethernet encapsulation with ethernet type 0xAB37, and >> also it can be travelled by MPLS encapsulation. >> >> BIER has it's own OAM function, ECMP function and traceability. etc. >> through BIER header defined in RFC8296. >> >> >> >> For travelling through IPv6 only enviroment, we'd like to travel BIER >> packet by IPv6 encapsulation. >> >> In draft-zhang-bier-bierin6-04, we want to just use a new Next Header >> type for BIER header carrying. >> >> We want to bring the minimum impact on IPv6 existed execution, and the >> maximum flexibility for header interoperability. >> >> So if you have any question about draft-zhang-bier-bierin6-04, or about >> BIER technology itself, please tell me. I'am glad to explain them to you= . >> >> >> >> Thanks, >> >> Sandy >> >> >> > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 >> > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*TonyPrzygienda >> >> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*Michael McBride ; >> > *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*6man@ietf..org <6man@ietf.org> <6ma= n@ietf.org>; >> > *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B403=E6=9C=8819=E6=97=A5 01:12 >> >> *=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: BIER in IPv6* >> >> -------------------------------------------------------------------- >> IETF IPv6 working group mailing list >> ipv6@ietf.org >> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> -------------------------------------------------------------------- >> >> >> >> >> >> The specific ask here is for the 6man to look over both drafts, i.e. >> >> >> >> draft-zhang-bier-bierin6 >> >> >> >> and >> >> >> >> draft-xie-bier-ipv6-encapsulation >> >> >> >> and verify whether they conform to published IPv6 standards or raise >> objections/concerns. >> >> >> >> The requirements document is currently under active work/comments and >> does not represent any final or wide-consensus state so an opinion on it= s >> state is appreciated but it should not be used as any final or binding l= ist >> of requirements as to the targeted solution in BIER WG >> >> >> >> thanks >> >> >> >> --- tony >> >> >> >> On Tue, Mar 17, 2020 at 9:20 PM Michael McBride < >> michael.mcbride@futurewei.com> wrote: >> >> Hello, >> >> >> >> The bier wg could use your ipv6 recommendations. We=E2=80=99ve worked on= various >> solutions to transport a bier header in ipv6. We decided to pause and >> create a requirements document (draft-ietf-bier-ipv6-requirements) to he= lp >> steer us towards the right solution(s). In that drafts appendix we have = a >> fairly good summary of the various solutions. >> >> >> >> We=E2=80=99ve started to rally behind two solutions which meet the major= ity of >> the requirements: draft-xie-bier-ipv6-encapsulation (bier header in ipv6 >> EH) and draft-zhang-bier-bierin6 (bier header as payload using ipv6 NH). >> The bier chairs today asked to punt the bierv6 topic to 6man for advice >> before adopting any of these solutions. >> >> >> >> So here we are seeking your advice. The most simple approach would >> probably be to give >> https://datatracker.ietf.org/doc/draft-ietf-bier-ipv6-requirements/ a >> look and scroll down to the appendix to see a summary of the various >> solutions we=E2=80=99ve been considering. >> >> >> >> thanks! >> >> mike >> >> >> >> >> >> >> >> -------------------------------------------------------------------- >> IETF IPv6 working group mailing list >> ipv6@ietf.org >> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> -------------------------------------------------------------------- >> >> >> >> >> -------------------------------------------------------------------- >> IETF IPv6 working group mailing list >> ipv6@ietf.org >> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> -------------------------------------------------------------------- >> > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- > --=20 Gyan Mishra Network Engineering & Technology Verizon Silver Spring, MD 20904 Phone: 301 502-1347 Email: gyan.s.mishra@verizon.com --000000000000a8a36805a1a30d10 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Tony & Sandy=C2=A0
=
So is the idea proposed in the two drafts menti= oned for BIER IPv6 support of encoding the BIER header up to 256 bit mask f= or BFER encoding schema supporting up to I believe 128 BFERs per set - to e= ncode the BIER header into the DO EH - =C2=A0and then for directly connecte= d neighbor the outer header IPv6 encapsulation 1 hop tunnel used link local= source and destination - for non directly connected neighbors IPv6 encapsu= lation use multi hop tunnel with GUI SA and DA.=C2=A0 In both tunnel cases = being mutually exclusive the link local tunnel would have TTL 1 and multi h= op would have appropriate =C2=A0>1 ttl.

So this is 2 different solutions for 2 different use cas= es.=C2=A0 Correct?

Just = as with BIER IPv4 with BIER IPv6, the IGP extensions would flood the BIER i= nfo to build BIFT forwarding table to build the stateless MDT trees.
<= div dir=3D"auto">
In the case of SRv6 with disjo= int BIER where traffic steering is required to signal SRV6 topology the las= t header would be set to TBD.=C2=A0 So that last header would in non SRv6 I= Pv6 topology the Last header would be the DO EH with the BIER header encode= d. So with SRv6 how is the BIER header encoded?

=

For SRv6 support I am g= uessing we have to update the programming draft for an end type sid instant= iation flavor variation for a new BIER SID?

I am just thinking comparing BIER for v4 to BIER for v6= is there any way you could accomplish the same with v6 and not do any IPv6= tunneling and just add the L 2 1/2 BIER header and propagate the BIER head= er info into the IGP to build the BIFT forwarding table just as you do with= BIER v4.

I can see for = egress node BFER support the intermediate nodes and maybe even end =C2=A0no= de may not have to support BIER - but now if tunneling is used. =C2=A0

Is that the business justifi= cation for tunneling or maybe some other reason intrinsic to IPv6 I am miss= ing.

Am I totally off ba= se??


Gyan

On Sun, Mar 22, 2020 at 11:24 PM Tony Przygienda <= tonysietf@gmail.com> wrote:
That's a c= urrently ongoing discussions between the auhtors (cc:'ing bier as well)=

LL has advantages
* the packet cannot &= quot;escape" even if it has TTL > 1
* such a scheme can w= ork purely with ND
* it's hard to "send out the wrong in= terface" albeit v6 allows AFAIR to have same link local on multiple in= terfaces

Originally the draft did not even allow f= or global addressing (since we want to use v6 as L2-substitute here just li= ke MPLS & non-MPLS encapsulations are used in BIER) but this has a nice= side effect of allowing to "jump over non-BIER routers" if addre= ssed to bier prefix (which I personally think should be the only allowed gl= obal v6 used, otherwise we may end up with BIER frames in funky places and = possible "holes" in the replication fabric). Obviously strictly s= peaking it's not necessary since BIER can be carried in plethora of nor= mal unicast tunnels=C2=A0 but bunch of co-auhtors joined and the consensus = was to allow it

--- tony

<= /div>


On Sun, Mar 22, 2020= at 8:15 PM <zhang.zheng@zte.com.cn> wrote:

Hi Xuesong,=


Thank you for your question!

The LL address is used by direct connected = neighbor.

For the neighbor= which is not direct connected, the wider range address should be used.

=


Thanks,

Sandy


=
=E5=8E=9F=E5=A7=8B=E9=82= =AE=E4=BB=B6
=
=E5=8F=91=E4=BB= =B6=E4=BA=BA=EF=BC=9AGengxuesong(GengXuesong) <gengxuesong@huawei.com>
=E6=97=A5 =E6=9C=9F =EF=BC=9A2020=E5=B9=B403=E6=9C=8823=E6=97=A5 11:03
=E4=B8=BB =E9=A2=98 =EF=BC=9ARE: Re:BIER in IPv= 6 --- draft-zhang-bier-bierin6-04
<= div id=3D"m_-6741056521128555629gmail-m_7514846100541629398zwriteHistoryCon= tainer">

Hi Sandy and authors of dra= ft-zhang-bier-bierin6:

=C2=A0

I have some questions about the = section 2 when reading the draft. It is mentioned that:

=E2=80=9CIf... The destination address in IPv6 hea= der SHOULD be the neighbor's link-local address.

Otherwise... the destination address SHOULD be the BI= ER prefix of the BFR neighbor.=E2=80=9D

Seems like the draft proposes 2 methods of IPv6 header encapsula= tion.

Could these 2 methods be combined ? If not, what&= #39;s the use case and design consideration for each method?<= /span>

=C2=A0

Best Regards

Xuesong

=C2=A0

=C2=A0

= =C2=A0

From: i= pv6 [mailto:ipv6= -bounces@ietf.org]On Behalf Of zhang.zheng@zte.com.cn
= Sent: Saturday, March 21, 2020 1:43 PM
To: 6man@ietf.org
Subject: Re:BIER in IPv6 --- draft-zhang-bier-bierin6-04<= u>

=C2=A0<= u>

<= div>
<= div>

Hi,

As co-author of BIERin6 (draft-zhang-bier-bierin6-04), before yo= u read the draft, please let me introduce BIER technology to you at first:<= u>

BIER technology, as defined= in RFC8279, it's a new multicast technology. The principle is achievin= g multicast forwarding by hop-by-hop execution.

= BIER is a transport protocol, not just a function. As = defined in RFC8296, BIER has it's own ethernet encapsulation with ether= net type 0xAB37, and also it can be travelled by MPLS encapsulation.=

BIER has it's own OAM functio= n, ECMP function and traceability. etc. through BIER header defined in RFC8= 296.

=C2=A0

For travelling through IPv6 only enviromen= t, we'd like to travel BIER packet by IPv6 encapsulation.=

In draft-zhang-bier-bierin6-04, we want = to just use a new Next Header type for BIER header carrying.<= /span>

We want to bring the minimum impact on IP= v6 existed execution, and the maximum flexibility for header interoperabili= ty.

So if you have any ques= tion about draft-zhang-bier-bierin6-04, or about BIER technology itself, pl= ease tell me. I'am glad to explain them to you.

=C2=A0

Thanks,

Sandy

=C2=A0

<= div style=3D"display:block">

=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6

=
<= div>

=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A= TonyPrzygienda <tonysietf@gmail.com>

=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A<= /span>Michael McBride <michael.mcbride@futur= ewei.com>;

<= /div>

=E6=8A=84=E9= =80=81=E4=BA=BA=EF=BC=9A6man@ietf..org <6man@ietf.org>;

=
=

=E6=97=A5 =E6=9C=9F =EF=BC=9A2020=E5=B9=B403=E6=9C=8819=E6=97=A5 01:= 12

=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: BIER in IPv6<= /u>

-----------------------------------------= ---------------------------
IETF=C2=A0IPv6=C2=A0working=C2=A0group=C2=A0= mailing=C2=A0list
ipv= 6@ietf.org
Administrative=C2=A0Requests:=C2=A0https://www.ietf.org/mai= lman/listinfo/ipv6
-------------------------------------------------= -------------------

<BIER WG chair hat on>

=C2=A0

The specific ask he= re is for the 6man to look over both drafts, i.e.

<= /div>

=C2=A0

draft-zhang-bier-bier= in6

=C2=A0

and

=C2=A0

draft-xie-bier-ipv6-encapsulation

<= /div>

=C2=A0

and verify whether th= ey conform to published IPv6 standards or raise objections/concerns.=

= =C2=A0

Th= e requirements document is currently under active work/comments and does no= t represent any final or wide-consensus state so an opinion on its state is= appreciated but it should not be used as any final or binding list of requirements as to the targeted solution in BIER WG

=C2=A0=

thanks

= =C2=A0

--= - tony

=C2=A0

On Tue, Mar 17, 2020 at 9:20 PM Michael McBride <<= a href=3D"mailto:michael.mcbride@futurewei.com" target=3D"_blank">michael.m= cbride@futurewei.com> wrote:

Hello,

=C2=A0

The bier wg could use your ipv6 r= ecommendations. We=E2=80=99ve worked on various solutions to transport a bi= er header in ipv6. We decided to pause and create a requirements document (draft-ietf-bier-ipv6-requirements) to help steer us towards the = right solution(s). In that drafts appendix we have a fairly good summary of= the various solutions.

=C2=A0

We=E2=80=99ve started to rally behind two solutions which = meet the majority of the requirements: draft-xie-bier-ipv6-encapsulation (b= ier header in ipv6 EH) and draft-zhang-bier-bierin6 (bier header as payload using ipv6 NH). The bier chairs today asked to pun= t the bierv6 topic to 6man for advice before adopting any of these solution= s.

=C2= =A0

So = here we are seeking your advice. The most simple approach would probably be= to give =C2=A0https://datatracker.ietf.org/doc/draf= t-ietf-bier-ipv6-requirements/ a look and scroll down to the appendix to see a summary of the various sol= utions we=E2=80=99ve been considering.

=C2=A0

thanks!

mike

=C2=A0

=C2=A0

=C2=A0=

------------------------------------------------= --------------------
IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative= Requests: https://www.ietf.org/mailman/listinfo/ipv6
----------------= ----------------------------------------------------



=
On Thu, Mar 12, 2020 at 12:02 PM Toer= less Eckert <tte@cs.fau.de> wrot= e:
On Thu, Mar 1= 2, 2020 at 11:22:08AM -0700, Tony Przygienda wrote:
> Nagendra, IP-FRR is an interesting observation. There is no reason why= LL
> cannot be protected by another non-LL nexthop but it may not be as nat= ural
> as otherwise.
>
> As I said, no problem in softenting the draft from SHOULD to something= else
> as long we allow both LL and non-LL addressing.

> The driver to LL & NHOP=3D1
> was mainly to have people misunderstand that BIER can be forwarded all= over
> the place by default which will lead to a valley of tears long term al= beit
> it looks like a great idea first.

parsing failed. Can you plsease rephrase ?

<= div>OK, if you use LL and TTL=3D1 you basically won't manage to send to= wrong link or more than one hop so it forces a link-by-link L2.5 fabric wh= ich is BIER architecture day one on standard RFC (+ exception allowed to _b= ypass non-BIER supporting nodes_). As I said, the spec is NOT MUST and shou= ld not be. We can discuss out whether we should bput "SHOULD" wit= h BIER prefix (I'm kind of leery of v6 global addressing since that'= ;s not always given) but then we need to talk how we deal with parallel lin= ks (or maybe we don't have to given BIER only addresses whole BFR with = a bit, I kind of didn't do enough careful thinking here yet).
=C2=A0

> BIER is a switching fabric technology @
> L2.5 and not an overlay (and yes, it can be used that way but this is = IMO
> jsut as far from BIER as BESS is from idr ;-)

See my other discuss point about the IMHO most 'useful' modes of deployment/forwarding. Those would be good to discuss in the drafts.

Partial or full deployment of BIER with IPv6 encap:
=C2=A0 BIFR-to-BFER IPv6 encapsulated, per-BIER-hop rewrite of IPv6 header<= br> =C2=A0 No differnce between partial or full deployment,
=C2=A0 =C2=A0 =C2=A0should work automatically calculating remote next-hop i= n partial.

There is somehow a huge misc= onception that as intermediate node you can "rewrite headers and optio= ns on v6 while keeping the source address"in flight and "adresses= can encode my uncle's birthday" because "some people said so= now" but the ultimately governing body are v6 working groups not us. = In fact, AFAIR v6 specs you can't, almost without exceptions (see the r= aging discussions on SRv6 PHP, SRv6 basically breaking the "no v6 addr= ess has semantics behind subnetting", mucking around with options they= have no business to muck with and so on). BIER LL, TTL=3D1 is one hop forw= arding where v6 is acting as L2 basically and not some end-2-end forwarding= transport with semantics encoding.=C2=A0 If you start to shove BIER frames= around tunnels to show up in arbitrary places it's like shoving MPLS f= rames to weird places and expect "labels to work". A BIER bitmask= is basically a very weird label with really only local significance on the= link and not using it correctly will make you expose BIER mask in places w= here they do the wrong stuff (just like MPLS labels). Yes, bypassing non-su= pporting nodes is ok if we control the semantics of that tightly but everyt= hing else is basically brfeaking the architecture with a long tail fallout.= BIER is carefully thought out and reviewed and lots of stuff has security/= OAM/etc implications and that's what the WG is chartered to govern and = not come up with some "fashionable hacks" with the acronyms du jo= ur.

And yes, you can use BIER "in overlay&quo= t; but that is not the current charter of BIER WG as many other things are = not. Or that would be a "BIER-BESS" group I guess ...=C2=A0
<= /div>

And yes, "it's lame industry stuff" = you're quoting, we have v6 standards track documents signed of and 6man= to govern all that stuff and arguments along the lines "but my silico= n doesn't do that" or "this implementation is lousy" I&#= 39;m sympathetic to but to quote Yakov here "I cannot prevent you doin= g whatever you want to do in your privacy with the spec I'm publishing = but do not ask me to standardize your stuff if it does not follow the gover= ning architecture and needs interoperability".

And yes, please cross-post, I don't want 6man or spring to be le= d down some garden path without being plugged in into the BIER working grou= p where the BIER technology is governed.

--- = tony
=C2=A0
--00000000000042928605a0ad4e01-- From nobody Thu Mar 12 12:28:26 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F0A693A0797 for ; Thu, 12 Mar 2020 12:28:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ujmd_3zIQYNr for ; Thu, 12 Mar 2020 12:28:15 -0700 (PDT) Received: from mail-pf1-x42d.google.com (mail-pf1-x42d.google.com [IPv6:2607:f8b0:4864:20::42d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A30E23A053E for ; Thu, 12 Mar 2020 12:28:15 -0700 (PDT) Received: by mail-pf1-x42d.google.com with SMTP id z5so3750127pfn.5 for ; Thu, 12 Mar 2020 12:28:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=yaPCi6dPXl34O+dDK0OaIuo3MimRWGzGNkCZaaLXtR8=; b=I7//qW4rYtYkossn2DhhQup2r3Zou3TrFYCFSLP1T6JDEu2uvTaIsBGOAOp2jzSCXw +vBDo/Nm6dReguu3I9tZpmuAHJIUzLHf7MdaEUaIgaKGwTRMO8dS49BJfrSYSkqBqYo0 vYF2qi0QPVvPF63E3fCpCS6rNWf0bMPefq5DE6MPYPgh0TuMYoU6NFVOdnI0Txi0rMWs tsDnAgZ9KoHyzktr9t+sXxjcGhd8iJCUspXJyc6wLAwYbHd+DMux3Y31t9lSIS3whxy/ 74TLoklkDQUadupylW/mNDKeHbFtWjz8hPeqi4T7klFzwBm2sakDfxEGzHUwHTvqMCwj X74Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=yaPCi6dPXl34O+dDK0OaIuo3MimRWGzGNkCZaaLXtR8=; b=U2s1arDfX8Z6UaMBneP8pMLjhEk/vYLCqnnAKt4zbcVaNLpR6APGipGAX6DOvuifKg eKX85CwI4EqgM4o34qg3sbc63L/5tGPD3Z6iU8++XOI/j9Mo1ujs+EyTPVc/dks/NAEa zapnSK5qxTXY0Q2bjmmcmxK5H09J81pZqKIyebNUcZPH+r4c+eoPMnyTqLvB49YktFQr s1jdR3B6mrC1kgCXTQOC1PYnENNgy/dgkjeyKZK9CaCSBYeSGwcIQbERximHvCFhnSrI Wc65XiSBxuD9/ct68J9y8KiDyyo6oQ0Gq7E8WLfb+BdwXVc5G5w5lMcpXT+0myic6vC8 hUuA== X-Gm-Message-State: ANhLgQ2K4AaB+58orvtZRObp4N/cDCklkdQoPhLlb4HmGkNZ6XBajEtf J7AW2HCxGzN9ZSudEgcB3E1MN9KH3Om1PMYTj5tAHPOc X-Google-Smtp-Source: ADFU+vuz8F2j0nU3UlT5kdjssoXqLo7sVGPgBzV4zWU/uGDF0jsHvuHsPdTuJk4SULQMlk9X/23bwTeI559wKq7Ot7U= X-Received: by 2002:a92:cac8:: with SMTP id m8mr9925207ilq.302.1584041294137; Thu, 12 Mar 2020 12:28:14 -0700 (PDT) MIME-Version: 1.0 References: <20200312042429.GA12383@faui48f.informatik.uni-erlangen.de> <00788CA2-6F96-4AC5-BEB5-218C94AEC456@cisco.com> <20200312190230.GB17570@faui48f.informatik.uni-erlangen.de> In-Reply-To: From: Tony Przygienda Date: Thu, 12 Mar 2020 12:26:41 -0700 Message-ID: To: Toerless Eckert Cc: "Nagendra Kumar Nainar (naikumar)" , BIER WG Content-Type: multipart/alternative; boundary="000000000000a58f1005a0ad5ab6" Archived-At: Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 19:28:24 -0000 --000000000000a58f1005a0ad5ab6 Content-Type: text/plain; charset="UTF-8" > And yes, "it's lame industry stuff" you're quoting, we have v6 standards > track documents signed of and 6man to govern all that stuff and arguments > along the lines "but my silicon doesn't do that" or "this implementation is > lousy" I'm sympathetic to but to quote Yakov here "I cannot prevent you > doing whatever you want to do in your privacy with the spec I'm publishing > but do not ask me to standardize your stuff if it does not follow the > governing architecture and needs interoperability". > > > and not to be missed we're playing the card to certain extent towards HOMENET and the irony of that doesn't bypass me but BIER support on 50c home silicon in wi-fi routers will never happen and if it happens it will happen over proper L2 encaps ... --- tony --000000000000a58f1005a0ad5ab6 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=

And yes, "it's lame industr= y stuff" you're quoting, we have v6 standards track documents sign= ed of and 6man to govern all that stuff and arguments along the lines "= ;but my silicon doesn't do that" or "this implementation is l= ousy" I'm sympathetic to but to quote Yakov here "I cannot pr= event you doing whatever you want to do in your privacy with the spec I'= ;m publishing but do not ask me to standardize your stuff if it does not fo= llow the governing architecture and needs interoperability".

=C2=A0

and not = to be missed we're playing the card to certain extent towards HOMENET a= nd the irony of that doesn't bypass me but BIER support on 50c home sil= icon in wi-fi routers will never happen and if it happens it will happen ov= er proper L2 encaps ...

--- tony
--000000000000a58f1005a0ad5ab6-- From nobody Thu Mar 12 12:29:42 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E84BE3A07AE; Thu, 12 Mar 2020 12:29:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0w5dl0Vh63hy; Thu, 12 Mar 2020 12:29:32 -0700 (PDT) Received: from mail-io1-xd32.google.com (mail-io1-xd32.google.com [IPv6:2607:f8b0:4864:20::d32]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id ECE873A07B1; Thu, 12 Mar 2020 12:29:31 -0700 (PDT) Received: by mail-io1-xd32.google.com with SMTP id c19so5854111ioo.6; Thu, 12 Mar 2020 12:29:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Du+rKTQqsYRvXNpC2lczlHrleOaK4t1Z0GevgVUHKTg=; b=XX7mtEsV9BaFWkYt8AccEXUfN81aAv/f3Op7cak4G4BiW+/GlOLpDy125e33IlRjeD 8xOWKogcpe33+gfEmO2cYIsE/5jbJTgBd9FIE/LxqlB+/iwR0yRnOZ1iIoj4/Ek9Nljl Cyf2nnz641fN2c1WDr9JfTQXmbXpcWO58z8YFKP+bcRcvp7GH654tkpB4Rt1Iv6IfbM2 2gO+GK4Vw0UUyIYRHaEE8AwSFJBFvMIApsP1x+zaju6md5YmkJt7/z93fGGSc5f5yZpn I6hQTv67SGLz+xoRi4349P9aodlAfPTqY2jMmQYIXe/2nTexyPDlYlxe99LuE8nyu/8V e9GQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Du+rKTQqsYRvXNpC2lczlHrleOaK4t1Z0GevgVUHKTg=; b=bgAF+L74X0tQQZJcEz60MUizUmH7yAk6/VJSf8+5ivPY3ZyxGGlfxYwdexvKDCWqG4 oUPqTcSASQEX3f8KAG8wNPUWtRubgQlgCPgih4MmobIlb/rLknp8hvFmMbMS2kJ9gP7/ UDlR4lrE8faYPzaAHKwQCzfcBL4M9PES8Kns00h46GSsqrkG4FAnA3jkWicMsXKnHQN3 nhMdEz3rSYc4Nqqnv6ML1S6k+sUbrMjAVkuXLybgm4ofWxagvNbEtQPtHWETk4KMH8Yz 6EDT42W5aQSwkGOK/D7DQs2qu0eO7Z+hPw5xSLFSJ/psG0k2oIsaEeQs81rmTjHwW4XX tmjA== X-Gm-Message-State: ANhLgQ3odRBxHomsTkDr7wNJ4uCSGlB8L7OH2189uKLiLNiyxVtCO9sD BFYe0Z1WkzZfu/7t7blO3vAxM+LD9nZ2tb71rAY= X-Google-Smtp-Source: ADFU+vuxRSHMKxZO3N7d361aFmXrHFRQwQGXRNiq313DZRf/814mwTWNa+MS+toMWbVja+fbh9GJrXUEhmcp0BZDoXg= X-Received: by 2002:a02:dc6:: with SMTP id 189mr8058351jax.100.1584041370909; Thu, 12 Mar 2020 12:29:30 -0700 (PDT) MIME-Version: 1.0 References: <20200311225102.GB2331@faui48f.informatik.uni-erlangen.de> <20200312043703.GE2331@faui48f.informatik.uni-erlangen.de> In-Reply-To: <20200312043703.GE2331@faui48f.informatik.uni-erlangen.de> From: Tony Przygienda Date: Thu, 12 Mar 2020 12:27:54 -0700 Message-ID: To: Toerless Eckert Cc: BIER WG , iana@iana.org, bier-ads@ietf.org, BIER WG Chairs Content-Type: multipart/alternative; boundary="00000000000039028b05a0ad5fb4" Archived-At: Subject: Re: [Bier] Ethertype for non-MPLS BIER suggestion X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 19:29:40 -0000 --00000000000039028b05a0ad5fb4 Content-Type: text/plain; charset="UTF-8" yeah, not something I want to chase right now but I get your point. In case you get enlightened how the description can be updated, let me know and we'll start chasing it ... --- tony On Wed, Mar 11, 2020 at 9:37 PM Toerless Eckert wrote: > I never finalized getting ethertypes from IEEE > myself yet, so not sure about the processes. > > Would be nice if IANA or some other designated entity > could take ownership of these assignments, right now > the 8 ethertypes mentioning drafts which are all RFCs > now are all over the place. "TRILL WG", routing-area > or even "Cisco" (SFC/NSH). > > > On Wed, Mar 11, 2020 at 09:01:39PM -0700, Tony Przygienda wrote: > > oh, I see. no idea what the proper "update" procedure in IEEE is. Someone > > feels like ferreting that out? > > > > > > On Wed, Mar 11, 2020 at 9:00 PM Tony Przygienda > wrote: > > > > > I'm surprised, there was an official liaison and assignment from IEEE > of > > > the ethertype. Alia handled it while I remember having filed _the_ > forms > > > ;-) for her ... > > > > > > --- tony > > > > > > On Wed, Mar 11, 2020 at 3:51 PM Toerless Eckert wrote: > > > > > >> Dear IANA, BIER leadership > > >> > > >> Not sure what normal IANA procedures are (or for that matter IEEE > > >> procedures), > > >> but: > > >> > > >> I would appreciate if there was an attempt made to update the > following > > >> record with IEEE: > > >> > > >> http://standards-oui.ieee.org/ethertype/eth.txt > > >> > > >> > > >> AB37 IETF Routing Area Please read > > >> draft-ietf-bier-mpls-encapsulation-12 at > > >> 5177 Brandin Court > > >> https://datatracker.ietf.org/doc/draft-ietf-bier-mpls-encapsulation/. > > >> > > >> Fremont CA 94538 > > >> > > >> US > > >> > > >> Aka: Ask IEEE to change explanatory text to rfc8296 > > >> > > >> And for that matter, maybe IANA could check the other 7 entries of > > >> "draft-ietf" in that registry, and get them updated accordingly. > > >> > > >> Cheers > > >> Toerless > > >> > > >> P.S.: Great to see Routing Area has a physical mailbox address at the > > >> LLC. Is that the right way to send snail mail to our AD's ? (don't > > >> answer, just kidding). > > >> > > > > > > _______________________________________________ > > BIER mailing list > > BIER@ietf.org > > https://www.ietf.org/mailman/listinfo/bier > > > -- > --- > tte@cs.fau.de > --00000000000039028b05a0ad5fb4 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
yeah, not something I want to chase right now but I g= et your point. In case you get enlightened how the description can be updat= ed, let me know and we'll start chasing it ...

--- tony

On Wed, Mar 11, 2020 at 9:37 PM Toerless Eckert &l= t;tte@cs.fau.de> wrote:
I never finalized getting e= thertypes from IEEE
myself yet, so not sure about the processes.

Would be nice if IANA or some other designated entity
could take ownership of these assignments, right now
the 8 ethertypes mentioning drafts which are all RFCs
now are all over the place. "TRILL WG", routing-area
or even "Cisco" (SFC/NSH).


On Wed, Mar 11, 2020 at 09:01:39PM -0700, Tony Przygienda wrote:
> oh, I see. no idea what the proper "update" procedure in IEE= E is. Someone
> feels like ferreting that out?
>
>
> On Wed, Mar 11, 2020 at 9:00 PM Tony Przygienda <tonysietf@gmail.com> wrote: >
> > I'm surprised, there was an official liaison and assignment f= rom IEEE of
> > the ethertype. Alia handled it while I remember having filed _the= _ forms
> > ;-) for her ...
> >
> > --- tony
> >
> > On Wed, Mar 11, 2020 at 3:51 PM Toerless Eckert <tte@cs.fau.de> wrote:
> >
> >> Dear IANA, BIER leadership
> >>
> >> Not sure what normal IANA procedures are (or for that matter = IEEE
> >> procedures),
> >> but:
> >>
> >> I would appreciate if there was an attempt made to update the= following
> >> record with IEEE:
> >>
> >> http://standards-oui.ieee.org/ethertype= /eth.txt
> >>
> >>
> >> AB37=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 IETF Routing Area=C2=A0 =C2=A0Please rea= d
> >> draft-ietf-bier-mpls-encapsulation-12 at
> >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A05177 Brandin Court
> >> https://datatracke= r.ietf.org/doc/draft-ietf-bier-mpls-encapsulation/.
> >>
> >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Fremont=C2=A0 CA=C2=A0 945= 38
> >>
> >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0US
> >>
> >> Aka: Ask IEEE to change explanatory text to rfc8296
> >>
> >> And for that matter, maybe IANA could check the other 7 entri= es of
> >> "draft-ietf" in that registry, and get them updated= accordingly.
> >>
> >> Cheers
> >>=C2=A0 =C2=A0 =C2=A0Toerless
> >>
> >> P.S.: Great to see Routing Area has a physical mailbox addres= s at the
> >> LLC. Is that the right way to send snail mail to our AD's= ? (don't
> >> answer, just kidding).
> >>
> >

> _______________________________________________
> BIER mailing list
> BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier


--
---
tte@cs.fau.de
--00000000000039028b05a0ad5fb4-- From nobody Thu Mar 12 13:29:20 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 035323A08C0 for ; Thu, 12 Mar 2020 13:29:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.87 X-Spam-Level: X-Spam-Status: No, score=-0.87 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oI6t32loZMWJ for ; Thu, 12 Mar 2020 13:29:17 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0D6B23A08BE for ; Thu, 12 Mar 2020 13:29:16 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [131.188.34.52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id E79E054842E; Thu, 12 Mar 2020 21:29:09 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id DDFF6440040; Thu, 12 Mar 2020 21:29:09 +0100 (CET) Date: Thu, 12 Mar 2020 21:29:09 +0100 From: Toerless Eckert To: Tony Przygienda Cc: "Nagendra Kumar Nainar (naikumar)" , BIER WG Message-ID: <20200312202909.GC17570@faui48f.informatik.uni-erlangen.de> References: <20200312042429.GA12383@faui48f.informatik.uni-erlangen.de> <00788CA2-6F96-4AC5-BEB5-218C94AEC456@cisco.com> <20200312190230.GB17570@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 20:29:19 -0000 On Thu, Mar 12, 2020 at 12:23:13PM -0700, Tony Przygienda wrote: > > parsing failed. Can you plsease rephrase ? > > OK, if you use LL and TTL=1 you basically won't manage to send to wrong > link or more than one hop so it forces a link-by-link L2.5 fabric which is > BIER architecture day one on standard RFC (+ exception allowed to _bypass > non-BIER supporting nodes_). Sure, and we have L2 encap for that and should promote it and make sure it will happen in IPv6 deployments. If LL IPv6 tunnels in forwarding plane would be used widely in othre IETF technologies i would be less concerned. Right not it is not, and so i am worried to have an IPv6 encap profile in our draft that makes adoption most easy. > be. We can discuss out whether we should bput "SHOULD" with BIER prefix > (I'm kind of leery of v6 global addressing since that's not always given) > but then we need to talk how we deal with parallel links (or maybe we don't > have to given BIER only addresses whole BFR with a bit, I kind of didn't do > enough careful thinking here yet). > > > > > > > BIER is a switching fabric technology @ > > > L2.5 and not an overlay (and yes, it can be used that way but this is IMO > > > jsut as far from BIER as BESS is from idr ;-) > > > > See my other discuss point about the IMHO most 'useful' modes of > > deployment/forwarding. Those would be good to discuss in the drafts. > > > > Partial or full deployment of BIER with IPv6 encap: > > BIFR-to-BFER IPv6 encapsulated, per-BIER-hop rewrite of IPv6 header > > No differnce between partial or full deployment, > > should work automatically calculating remote next-hop in partial. > > > > There is somehow a huge misconception that as intermediate node you can > "rewrite headers and options on v6 while keeping the source address"in > flight Well, thats what SRH does. BIER also rewrites bitstring. rewriting IPv6 dest and optional source should in general be easier than actual decap+encap. Tell me if i am wrong. > and "adresses can encode my uncle's birthday" because "some people > said so now" Where where you when embedded RP was standardized so that you can throw stones ? ;-) My concern about SRH is that it is waste on midpoint SIDs not that abuse of IPv6 addresses is bad. I liked Pierre's bitstring in IPv6 addr, i just felt it was too short to be useful. I liked terrastreams QoS encoding in IPv6 addresses. If you want people to stop (ab)using IPv6 addresses, you need to give operators other header elements in which to carry policy. Flexible extensible not only by vendors. I tried to bring frameworks like this to IETF and was immediatly confronted by the IETF perpass/privacy lobby: Routers should not know anything. Ok, now i've run miles away from subject matter to my favourite soap box. > but the ultimately governing body are v6 working groups not > us. In fact, AFAIR v6 specs you can't, almost without exceptions (see the > raging discussions on SRv6 PHP, SRv6 basically breaking the "no v6 address > has semantics behind subnetting", mucking around with options they have no > business to muck with and so on).where v6 is acting as L2 basically and not > some end-2-end forwarding transport with semantics encoding. RFC8200 was written for uncontrolled internet paths, SRH/SRv6 was designed for controlled networks. Huge overhead as a result. If not for (predecessors) of RFC8200 would have from the beginning been something like CRH (which still has to argue representing IPv6 adddresses with mapping to suite RFC8200). RFC8200 is a plane to travel the planet. No, its not ideal to drive on highways, but nobody in the IETF wants to build a car. IPng process was 30 years ago, and we still think its results is sufficient for all futures. > If you start to shove BIER frames > around tunnels to show up in arbitrary places it's like shoving MPLS frames > to weird places and expect "labels to work". A BIER bitmask is basically a > very weird label with really only local significance on the link and not > using it correctly will make you expose BIER mask in places where they do > the wrong stuff (just like MPLS labels). I don't buy that argument. All VPNs are overlay networks (PE to PE), and operators know how to build them. Most L3 router networks are overlay networks on top of an optical switched underlay providing p2p colored connections, and those paths are often manually configured, similar to what i did 30 years ago with X.25 PVCs. All 3G/4G/5G "core" networks are overlays. Building overlays happens everywhere. Some are better, some are worth, often in the eye of the beholder. > Yes, bypassing non-supporting > nodes is ok if we control the semantics of that tightly but everything else > is basically brfeaking the architecture with a long tail fallout. BIER is > carefully thought out and reviewed and lots of stuff has security/OAM/etc > implications and that's what the WG is chartered to govern and not come up > with some "fashionable hacks" with the acronyms du jour. I think the best thing BIER can do is to promote the option of automatic mapping from a self-intelligent underlay, aka: the fully automatic IGP option described in rfc8297. I don't know how important partial upgrades/adoption of BIER within an IGP domain is, but i have seen a lot of asks for this for prior IP multicast technologies (especially in SPs), and it is so much easier now with BIER given how we are relying on autoconfiguration via IGP information. That makes it excitingly more attractive than the problematic solutions we tried to build earlier where we where not given the option to exten IGPs. > And yes, you can use BIER "in overlay" but that is not the current charter > of BIER WG as many other things are not. Or that would be a "BIER-BESS" > group I guess ... Ethernet is also a useless overlay for p2p links. Can we please only support HDLC headers ? SRv6 whether RH or CRH is always an overlay. If we come up with a solution that allows smooth incremental adoption of BIER in an IGP domain by using IPv6 encap as long as there are no full ethernet encap paths, and then automatically switch to ethernet encap paths unless there is a policy override ("operator loves IPv6 encap or reuse IPv6 FRR), i think we are on a good path for the first round document. The main issue i see is tht most multicst use is in VPNs, and i am not sure we have a good VPN solution without MPLS without some way to encapsulate destination SIDs like we have in MPLS. > And yes, "it's lame industry stuff" you're quoting, we have v6 standards > track documents signed of and 6man to govern all that stuff and arguments > along the lines "but my silicon doesn't do that" or "this implementation is > lousy" I'm sympathetic to but to quote Yakov here "I cannot prevent you > doing whatever you want to do in your privacy with the spec I'm publishing > but do not ask me to standardize your stuff if it does not follow the > governing architecture and needs interoperability". Its also bad to publish supposedly well-meaning architectures when you're not the one having to suffer on its issues. Should i bring on my rant about IPv6 scoped address architecture ? None of the folks who wrote that ever thought about IPv6 multicast. At best, architectures are good intentions. If they are assumed to be cast in stome they become dogmas. > And yes, please cross-post, I don't want 6man or spring to be led down some > garden path without being plugged in into the BIER working group where the > BIER technology is governed. Input from othre WGs is only that: Input. As i said, we do need to be worried about them claiming they can prohibit options we as BIER like to do - because of dogmas. Toerless > > --- tony -- --- tte@cs.fau.de From nobody Thu Mar 12 14:00:12 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 064D23A094C for ; Thu, 12 Mar 2020 14:00:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yk-UJxLtM5mu for ; Thu, 12 Mar 2020 14:00:08 -0700 (PDT) Received: from mail-lj1-x232.google.com (mail-lj1-x232.google.com [IPv6:2a00:1450:4864:20::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CE41A3A0948 for ; Thu, 12 Mar 2020 14:00:07 -0700 (PDT) Received: by mail-lj1-x232.google.com with SMTP id u12so8169769ljo.2 for ; Thu, 12 Mar 2020 14:00:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=44Wg9dpBXI5dxd3FcqMMUUTA5kRyNm70UCHT816wvAM=; b=EbF3GSqWXu2IC3SHX/HIFUjsHswEq0q4Xnp26HOnpBHCWXio4QKfrHSw6ophXETKSI VdQfKiAss1kYs3MkyysccnljjEKMQFxSkScuOXv8FIi0gRm0QliPDIca5VxfoN31RnD9 o/jTLu7lXBzu+1CJjI5i0DU0htnATyjIC6fz90t8DMlkUN5XNPyQxyWze8GsUFKKyBE8 AOZJuBJUn3YlOULV/GR77yJ7mKxKOHPipEcXC69KODrPJgeRmPUEEUKruyrHO3F8oTr6 4eLpKrRd0kpX1XsmnD4SslQhR5Zdw6haNBLtdEBg4ma8qxs1fdPgiFyyoJtts8wA6sa4 wZCw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=44Wg9dpBXI5dxd3FcqMMUUTA5kRyNm70UCHT816wvAM=; b=UfgOj2ot/aiFjTJEhlf1jKRqi1Scyj2dLurXv6VVrO/n2dYd05TAmjVRMz1GcEW/b0 NpypYELckbi2fMLUNbZGyCGaOFufrzIjPySZVPq8VEcpd40y54ynMiHu+Krjzm3x8i0G tpOMqhIfc8pK3ikiCxgKP4CalceDydXNkQP4ViPo27XfaCBmVhygXI98zbHQFf5QRz3k GIfQvXeKyP4crRSV9iH+uS9+1ca1g1U+eriyTvlFzyX0KeRdKNLX7ERuNNhEYodjKmw9 7ujX4VeMTq1LMXC/Ze8w/NYfWGCfT1/0KZt2oBaa3ct6rd3bou6inJw5tEM8aImsAZAx uunw== X-Gm-Message-State: ANhLgQ2XWT/L4+Tuv1T1oP1aK1OTni1SqdDdpQfWEvN8TDlvi9xGHFMp 41Tdy51jfnKD/TJ5hMfhrpX6Kscz4YvWZsVv9z5b3w== X-Google-Smtp-Source: ADFU+vucypCmZbejLCUakixlzSE9wtRdaclT+NK3W/gErWPLbHbWanTq9QoFVZAl7HYqaEnmlDQRs0MY229A0YZDdZ4= X-Received: by 2002:a2e:3608:: with SMTP id d8mr6228651lja.52.1584046806038; Thu, 12 Mar 2020 14:00:06 -0700 (PDT) MIME-Version: 1.0 References: <20200312042429.GA12383@faui48f.informatik.uni-erlangen.de> In-Reply-To: From: Greg Mirsky Date: Thu, 12 Mar 2020 13:59:54 -0700 Message-ID: To: Tony Przygienda Cc: Toerless Eckert , BIER WG Content-Type: multipart/alternative; boundary="0000000000002e7c7005a0aea31a" Archived-At: Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 21:00:10 -0000 --0000000000002e7c7005a0aea31a Content-Type: text/plain; charset="UTF-8" Hi Tony, I think that the example of LL BFD, i.e. single-hop BFD, is in fact opposite, not in support of TTL/HC = 1. RFC 5881, following on the extensive discussion of the GTSM in RFC 5082, requires that TTL/HC for the single-hop BFD be set to 255 and BFD packet discarded by a receiver if TTL/HC != 255. I'll note that we had an extensive discussion with IESG on the TTL/HC value in the case of BFD over VXLAN. We've agreed that a VXLAN tunnel is as single-hop IP and thus TTL/HC MUST be set to 255. Not sure if all this information was helpful. My $.02 Regards, Greg On Thu, Mar 12, 2020 at 8:57 AM Tony Przygienda wrote: > > >> > If the neighbor is directly connected, The destination address in >> > IPv6 header SHOULD be the neighbor's link-local address on this >> > router's outgoing interface, the source destination address SHOULD be >> > this router's link-local address on the outgoing interface, and the >> > IPv6 TTL MUST be set to 1. >> >> I've started a thread on 6man/6ops re. link-local-tunnel traffic as i >> have the same also in my ANIMA draft, and in implementations i have >> seen quite some issues tunneling traffic HW accelerated across IPv6 >> link-local addresses and TTL=1. >> >> Would welcome implementers in BIER to chime in if they would see this >> as an issue. >> >> If folks feel supporting this HW accelerated might be more complicated >> than non-link-local tunnels, then it might be useful to change the >> text to also allow/require support for using the BFR address even for >> subnet adjacent BFR. In that case one would not use HL=1, and that >> too i have seen to be a problem in HW accelerated forwarding plane: >> HL/TTL=1 -> MUST punt (software processing). >> > > really? I'm surprised, actually, LL with TTL=1 for link local is an > absolutely common case since years for e.g. BFD and other thinks like BGP > sessions in many topologies so if a silicon does not support that it's a > strange IPv6 silicon. But yes, supporting LL properly in IPv6 is non > trivial (spec allows to have e.g. same LL on multiple interfaces in a > node). The spec here says SHOULD and not MUST so it's perfectly find using > any addresses (one could probably even use BFR prefix but that would lead > to ECMP non-deterministic behavior which may or may not be OK depending on > deployment). If that needs to be spelled out (albeit it's redundant) I'm > not opposed to that. > > Please cc: bier working group on any discussion you are starting with 6man > on the side ... Unless I missed my morning mail input ... > > --- tony > > > > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier > --0000000000002e7c7005a0aea31a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Tony,
I think that the example of LL BFD, i.e. sing= le-hop BFD, is in fact opposite, not in support of TTL/HC =3D 1. RFC 5881, = following on the extensive discussion of the GTSM in RFC 5082, requires tha= t TTL/HC for the single-hop BFD be set to 255 and BFD packet discarded=C2= =A0by a receiver if TTL/HC !=3D 255. I'll note that we had an extensive= discussion with IESG on the TTL/HC value in the case of BFD over VXLAN. We= 've agreed that a VXLAN tunnel is as single-hop IP and thus TTL/HC MUST= be set to 255. Not sure if all this information was helpful. My $.02
=

Regards,
Greg

On Thu, Mar 12, 2020 at 8:= 57 AM Tony Przygienda <tonysietf@= gmail.com> wrote:


>=C2=A0 =C2=A0 If the neighbor is directly connected, The destination ad= dress in
>=C2=A0 =C2=A0 IPv6 header SHOULD be the neighbor's link-local addre= ss on this
>=C2=A0 =C2=A0 router's outgoing interface, the source destination a= ddress SHOULD be
>=C2=A0 =C2=A0 this router's link-local address on the outgoing inte= rface, and the
>=C2=A0 =C2=A0 IPv6 TTL MUST be set to 1.

I've started a thread on 6man/6ops re. link-local-tunnel traffic as i have the same also in my ANIMA draft, and in implementations i have
seen quite some issues tunneling traffic HW accelerated across IPv6
link-local addresses and TTL=3D1.

Would welcome implementers in BIER to chime in if they would see this
as an issue.

If folks feel supporting this HW accelerated might be more complicated
than non-link-local tunnels, then it might be useful to change the
text to also allow/require support for using the BFR address even for
subnet adjacent BFR. In that case one would not use HL=3D1, and that
too i have seen to be a problem in HW accelerated forwarding plane:
HL/TTL=3D1 -> MUST punt (software processing).

=
really? I'm surprised, actually, LL with TTL=3D1 for link lo= cal is an absolutely common case since years for e.g. BFD and other thinks = like BGP sessions in many topologies so if a silicon does not support that = it's a strange IPv6 silicon. But yes, supporting LL properly in IPv6 is= non trivial (spec allows to have e.g. same LL on multiple interfaces in a = node). The spec here says SHOULD and not MUST so it's perfectly find us= ing any addresses (one could probably even use BFR prefix but that would le= ad to ECMP non-deterministic behavior which may or may not be OK depending = on deployment).=C2=A0 If that needs to be spelled out (albeit it's redu= ndant) I'm not opposed to that.

Please cc= : bier working group on any discussion you are starting with 6man on the si= de ... Unless I missed my morning mail input ...

<= div>--- tony




_______________________________________________
BIER mailing list
BIER@ietf.org
https://www.ietf.org/mailman/listinfo/bier
--0000000000002e7c7005a0aea31a-- From nobody Thu Mar 12 14:00:47 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 288153A094F; Thu, 12 Mar 2020 14:00:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.096 X-Spam-Level: X-Spam-Status: No, score=-1.096 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, FREEMAIL_REPLY=1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id r__7u8v4xoRV; Thu, 12 Mar 2020 14:00:43 -0700 (PDT) Received: from mail-ed1-x534.google.com (mail-ed1-x534.google.com [IPv6:2a00:1450:4864:20::534]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 294013A0948; Thu, 12 Mar 2020 14:00:43 -0700 (PDT) Received: by mail-ed1-x534.google.com with SMTP id h62so9204470edd.12; Thu, 12 Mar 2020 14:00:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:in-reply-to:references:mime-version:date:message-id:subject:to :cc; bh=wPSHEa/ZW8xOiOm4mBDWcgFURQd0vMxMYHPSY6M1o6M=; b=UUuTYDcjjKbr1ssqjnipzWlsjXd1EDHqM3y8lRDB0GBGU7MYeaqVb4jWa+uw1MGS6V rPdDchkj2/rIT152lv0sYytFId1EgdnsHJeXE0HytDeB/rWnrgipi4itbyPHwQbpw0yw oLkXCyPLajBG+elW7HhZJuD5+PiH5ub4aehqMpo0cgoNrfUe93sMy+KdqjTTHesT7DzF VaA6X4nSeyDHylKz+FG0c12meGQmlW9A8R+BcgOk7XU/1Jc1rQ6UuLYa1sKirfdgRA7F vvCNR5hHpP8OXsmtX97DaHWu1BoI7PYSIPZCq0loHfJqC41asph9efkV0WxcyajDcW4I A4Mw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:in-reply-to:references:mime-version:date :message-id:subject:to:cc; bh=wPSHEa/ZW8xOiOm4mBDWcgFURQd0vMxMYHPSY6M1o6M=; b=R6ecWJuioYM0eTMuPMIenUsaXTnNZucyrZ8btXqPO11JzjRtMwUbnUyfHa3ZQXHCE3 SuO5YqHLKDL+UlT0ac/Hwi7F6M+3MbDTXcvR1PNkRnBbscNbQBKTtJ9b7a0+NHwhuUYS toXTBb5TTgQ3v1q7B9lZcUcQmaxPjqp2mNFRfWHJ+HzyiJBG4E/k4C08pR/kJw9b9zqX GTOuYKN0gDltiGnx+lKcH1CfBiIi/F+ZJ1qZsAtYQZpBZMbqcMzoxCLcCl1MBf72WPTA un4L/wLAL1qFfeuZcCRmeTDeD3yLyAqwEQFesANIbntQy+T4XzQK6ZDls23NyO4Gtjv/ 49+A== X-Gm-Message-State: ANhLgQ0HCTJkhvck0ppS1ImyUZua6qJsW+oTM1l0fa3VjRGndxGtixnz /PX3MpkreHCgav32UgUmZIrgg2U4BE9V8Ry9FZg= X-Google-Smtp-Source: ADFU+vtk9UKyrWlEzXSQP+MmvdF/bAIrELySUjSUvo8S0toZ5M1loV0F2HdNtvePZa5gIhZ1ID7+qIYNLf1av22WX54= X-Received: by 2002:a50:ee88:: with SMTP id f8mr10107270edr.300.1584046841735; Thu, 12 Mar 2020 14:00:41 -0700 (PDT) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Thu, 12 Mar 2020 21:00:39 +0000 From: Alvaro Retana In-Reply-To: References: <20200311225102.GB2331@faui48f.informatik.uni-erlangen.de> <20200312043703.GE2331@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Date: Thu, 12 Mar 2020 21:00:39 +0000 Message-ID: To: Toerless Eckert , Tony Przygienda Cc: BIER WG , BIER WG Chairs , iana@iana.org, bier-ads@ietf.org Content-Type: multipart/alternative; boundary="0000000000004f30be05a0aea5a2" Archived-At: Subject: Re: [Bier] Ethertype for non-MPLS BIER suggestion X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 21:00:45 -0000 --0000000000004f30be05a0aea5a2 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi! I didn=E2=80=99t make this request, but according to the policy the request= to the IEEE RA is to be made after approval for publication=E2=80=A6but before the= RFC is published. I guess that=E2=80=99s how we got in this situation. I assume that the way to update the entry is to contact the IEEE RA. I sent a message to the IEEE/IETF coordination team =E2=80=94 with any luck, = they have a simple process for an update and we can take care of this (and potentially other entries). I=E2=80=99ll then take the AI. Alvaro. On March 12, 2020 at 3:29:41 PM, Tony Przygienda (tonysietf@gmail.com) wrote: yeah, not something I want to chase right now but I get your point. In case you get enlightened how the description can be updated, let me know and we'll start chasing it ... --- tony On Wed, Mar 11, 2020 at 9:37 PM Toerless Eckert wrote: > I never finalized getting ethertypes from IEEE > myself yet, so not sure about the processes. > > Would be nice if IANA or some other designated entity > could take ownership of these assignments, right now > the 8 ethertypes mentioning drafts which are all RFCs > now are all over the place. "TRILL WG", routing-area > or even "Cisco" (SFC/NSH). > > > On Wed, Mar 11, 2020 at 09:01:39PM -0700, Tony Przygienda wrote: > > oh, I see. no idea what the proper "update" procedure in IEEE is. Someo= ne > > feels like ferreting that out? > > > > > > On Wed, Mar 11, 2020 at 9:00 PM Tony Przygienda > wrote: > > > > > I'm surprised, there was an official liaison and assignment from IEEE > of > > > the ethertype. Alia handled it while I remember having filed _the_ > forms > > > ;-) for her ... > > > > > > --- tony > > > > > > On Wed, Mar 11, 2020 at 3:51 PM Toerless Eckert wrote= : > > > > > >> Dear IANA, BIER leadership > > >> > > >> Not sure what normal IANA procedures are (or for that matter IEEE > > >> procedures), > > >> but: > > >> > > >> I would appreciate if there was an attempt made to update the > following > > >> record with IEEE: > > >> > > >> http://standards-oui.ieee.org/ethertype/eth.txt > > >> > > >> > > >> AB37 IETF Routing Area Please read > > >> draft-ietf-bier-mpls-encapsulation-12 at > > >> 5177 Brandin Court > > >> https://datatracker.ietf.org/doc/draft-ietf-bier-mpls-encapsulation/= . > > >> > > >> Fremont CA 94538 > > >> > > >> US > > >> > > >> Aka: Ask IEEE to change explanatory text to rfc8296 > > >> > > >> And for that matter, maybe IANA could check the other 7 entries of > > >> "draft-ietf" in that registry, and get them updated accordingly. > > >> > > >> Cheers > > >> Toerless > > >> > > >> P.S.: Great to see Routing Area has a physical mailbox address at th= e > > >> LLC. Is that the right way to send snail mail to our AD's ? (don't > > >> answer, just kidding). > > >> > > > > > > _______________________________________________ > > BIER mailing list > > BIER@ietf.org > > https://www.ietf.org/mailman/listinfo/bier > > > -- > --- > tte@cs.fau.de > --0000000000004f30be05a0aea5a2 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =
Hi!

I didn=E2=80=99t make this request, but according to the policy= the request to the IEEE RA is to be made after approval for publication=E2= =80=A6but before the RFC is published.=C2=A0 I guess that=E2=80=99s how we = got in this situation.

I assume that the way to update the entry is to contact the IEEE RA.=C2= =A0 I sent a message to the IEEE/IETF coordination team =E2=80=94 with any = luck, they have a simple process for an update and we can take care of this= (and potentially other entries).

I=E2=80=99ll then take the AI.

Alvaro.

On Mar= ch 12, 2020 at 3:29:41 PM, Tony Przygienda (tonysietf@gmail.com) wrote:

yeah, not something I want to chase right now but I get your point. In case you get enlightened how the description can be updated, let me know and we'll start chasing it ...

--- tony

On Wed, Mar 11, 2020 at 9:37 PM Toerless Eckert <tte@cs.fau.de> = wrote:
I never finalized getting ethertypes from IEEE
myself yet, so not sure about the processes.

Would be nice if IANA or some other designated entity
could take ownership of these assignments, right now
the 8 ethertypes mentioning drafts which are all RFCs
now are all over the place. "TRILL WG", routing-area
or even "Cisco" (SFC/NSH).


On Wed, Mar 11, 2020 at 09:01:39PM -0700, Tony Przygienda wrote:
> oh, I see. no idea what the proper "update" procedure in IEE= E is. Someone
> feels like ferreting that out?
>
>
> On Wed, Mar 11, 2020 at 9:00 PM Tony Przygienda <tonysietf@gmail.com> wrote: >
> > I'm surprised, there was an official liaison and assignment from IEEE of
> > the ethertype. Alia handled it while I remember having filed _the_ forms
> > ;-) for her ...
> >
> > --- tony
> >
> > On Wed, Mar 11, 2020 at 3:51 PM Toerless Eckert <tte@cs.fau.de>= ; wrote:
> >
> >> Dear IANA, BIER leadership
> >>
> >> Not sure what normal IANA procedures are (or for that matter IEEE
> >> procedures),
> >> but:
> >>
> >> I would appreciate if there was an attempt made to update the following
> >> record with IEEE:
> >>
> >> http://standards-oui.ieee.org/ethertype= /eth.txt
> >>
> >>
> >> AB37=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 IETF Routing Area=C2=A0 =C2=A0Please read
> >> draft-ietf-bier-mpls-encapsulation-12 at
> >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A05177 Brandin Court
> >> https://datatracke= r.ietf.org/doc/draft-ietf-bier-mpls-encapsulation/.
> >>
> >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Fremont=C2=A0 CA=C2=A0 94538
> >>
> >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0US
> >>
> >> Aka: Ask IEEE to change explanatory text to rfc8296
> >>
> >> And for that matter, maybe IANA could check the other 7 entries of
> >> "draft-ietf" in that registry, and get them updated accordingly.
> >>
> >> Cheers
> >>=C2=A0 =C2=A0 =C2=A0Toerless
> >>
> >> P.S.: Great to see Routing Area has a physical mailbox address at the
> >> LLC. Is that the right way to send snail mail to our AD's ? (don't
> >> answer, just kidding).
> >>
> >

> _______________________________________________
> BIER mailing list
> BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier


--
---
tte@cs.fau.de
--0000000000004f30be05a0aea5a2-- From nobody Thu Mar 12 14:10:09 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0B7813A0973; Thu, 12 Mar 2020 14:10:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.87 X-Spam-Level: X-Spam-Status: No, score=-0.87 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id V8GLY2E2-ET4; Thu, 12 Mar 2020 14:09:59 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 764D03A096E; Thu, 12 Mar 2020 14:09:59 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 6A78454842E; Thu, 12 Mar 2020 22:09:54 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id 63E52440040; Thu, 12 Mar 2020 22:09:54 +0100 (CET) Date: Thu, 12 Mar 2020 22:09:54 +0100 From: Toerless Eckert To: Jen Linkova Cc: 6man <6man@ietf.org>, V6 Ops List , bier@ietf.org Message-ID: <20200312210954.GA34894@faui48f.informatik.uni-erlangen.de> References: <20200312000016.GO54522@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] [v6ops] IPv6 link-local traffic questions X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 21:10:01 -0000 On Thu, Mar 12, 2020 at 11:33:37AM +1100, Jen Linkova wrote: > I believe it depends what you are trying to achieve. If you want to > make sure that the traffic never leaves the network - then hop limit = > 1 helps. But using link-local sources/destinations would help even > better if the routers comply with RFC4291 Section 2.5.6 Yes, i am assuming 2.5.6 is mandatory given how this is standards track and how abence of RFC2119 langauge does not render "must" into a non standard requirement. > If you want to make sure those packets are not sent by a malicious > party from outside - hop limit shall be 255. > For example, see RFC4861 Section 3.1 > Neighbor Discovery. Ah, nice. I never looked into all those encoding details. Thanks. Preceeding RFC5082 and hence not referring to it, and neither does RFC5082 refer to RFC4861, thats why i couldn't easily find it by sea4rching. > > There is an additional set of consideration re. link-local traffic > > when trying to use it as a HW accelerated tunneling mechanism across links, > > a use we both have in ANIMA, and maybe get the same in BIER (probably > > other WGs too, not sure). > > > > In implementations, i have seen quite a range of issues with > > accelerated forwarding planes across link-local addressed tunnels, > > and when using non-link-local addresses (loopback addresses), > > the HW plane forwarding might have issues doing HW forwarding, because > > usually TTL=1 is only used for control plane traffic. Of course, > > this is not a good architectural argument, but if given architectural > > leeway to even choose 42, maybe GTSM/255 is easier to be supported > > across various HW accelerated forwarding planes than 1. > > > > Opinions and experiences welcome! > > If you control the router I'd say 'link-local source/destination, > HL=255 AND RFC4291 would be the best option. RFC4291 seems redundant given how its mandatory anyhow, but of course helpfull to remind readers of new specs. Given how 4291 is widely deployed it certainly qualifies well as sufficient proof of the mechanism widely deployed - for control plane. So, effectively, architcturally, the sending TTL is a choice of the application, and for control plane apps, we evolved choosing from 1 first and now BCP is 255. Coming from multicast, i kinda grew up with the belief there is a MUST use TTL=1 somewhere for a long time (when using link-local addresses), but never verified that belief. Still hesitant of prescribing 255 for hardware accelerated forwarding plane use case, but given how link-local tunnels aren't really a thing it would be hard to find prior evidence of successful wide deployment. Given how i tinkered with them, i've seen all type of troubles, including TTL ones. > I did see a few devices somewhere far away sending me ICMPv6 (packet > too big) from their link-local addresses but it was not very common > case. Agree. same here. Thanks & Cheers Toerless > > -- > SY, Jen Linkova aka Furry -- --- tte@cs.fau.de From nobody Thu Mar 12 14:27:46 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D86003A03EB for ; Thu, 12 Mar 2020 14:27:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tdrJaHQUSmxi for ; Thu, 12 Mar 2020 14:27:43 -0700 (PDT) Received: from mail-il1-x12c.google.com (mail-il1-x12c.google.com [IPv6:2607:f8b0:4864:20::12c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 391C73A03EF for ; Thu, 12 Mar 2020 14:27:43 -0700 (PDT) Received: by mail-il1-x12c.google.com with SMTP id f5so6932743ilq.5 for ; Thu, 12 Mar 2020 14:27:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=xSm5c4ODSqCLiM7ZoMhgXpE0vd+RExYqJNFHUHjDaO0=; b=CwRcfrtiK9BmMvBZpRByr5xKu8Ms8In+k4QaE6ckdmMKeH12tdNdIORPCFgtbtIUpS ctkBLBVjTAHeEoVyOAWly9Ui8syHra7dU89O5l0gCPSzS573rhD9OExBGaEoMDMG/Skg xtCy81npTirtNUtxuJDHcWDg5cZb23IH7uOCott0bjeq6xUZXsk65Sss1zrmVBGZNEGP 1heVyR+YvpjveTs3K4wtyOXJYjTEIUoTL6XatdIThZw0s2XzOQynEIuKP/jWY/fr+9fw jpJiLTICICkrS7f2swNPmAkB/ir65G9wGqKnsIbBtS+ZNp1MB4jctvRE+347z6pa8Fb6 +VmA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=xSm5c4ODSqCLiM7ZoMhgXpE0vd+RExYqJNFHUHjDaO0=; b=Z+Q42PEBcFBGYkVzqbyTxPxklT22vXM+EDSmugY75ToqqHyAo3WHkHEVPxhSkPhKqR b5uKIiWdsv00LFK6NpFxQHR28CaESKOLNNApvviRdDxUxu6YyDaM/kcUV0d5U616h9lz /F9H6h4qswuZ6ptC0AhbPA6RPZ+FuKEIUumIfRRraHPp0Xj6be8fv30trdyU03QfHB8n VpUzbIYLgO5YdQvcYDe587nSQMnLueMgR/3XBte6FLKKe210lWCxSKBLUg+sK16+SwTz LrUQdp3ZoCmHlDK2GYdyeopomzKBRYhIQtasGaRwlraExtFg6FQ7SDgrHkgoeJHSEaWD 0FGw== X-Gm-Message-State: ANhLgQ3bnyPs5NX77BTolBMUFvgLfDAusiSOYVgwkCK7BDFpQDg8qP7z CbCunxL1x3K6Mor9ybzJD3QEcFS/1KvXdCyFwe0= X-Google-Smtp-Source: ADFU+vtWViDN+EuQfN7NqLUXGGoSj/BMIp/r8cm674mEiLk+G7fh5sGlnP/+8Ry2W+GMeONHgfQEaqsUT+tOaxwQM4w= X-Received: by 2002:a92:c9cb:: with SMTP id k11mr10730228ilq.132.1584048462608; Thu, 12 Mar 2020 14:27:42 -0700 (PDT) MIME-Version: 1.0 References: <20200312042429.GA12383@faui48f.informatik.uni-erlangen.de> In-Reply-To: From: Tony Przygienda Date: Thu, 12 Mar 2020 14:26:09 -0700 Message-ID: To: Greg Mirsky Cc: Toerless Eckert , BIER WG Content-Type: multipart/alternative; boundary="000000000000ebbc1c05a0af05c5" Archived-At: Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 21:27:45 -0000 --000000000000ebbc1c05a0af05c5 Content-Type: text/plain; charset="UTF-8" I'm all for TTL=1. It's one thing having a BFD frame run away, another a multicast frame ;-) But yeah, worth discussion on the list ... --- tony On Thu, Mar 12, 2020 at 2:00 PM Greg Mirsky wrote: > Hi Tony, > I think that the example of LL BFD, i.e. single-hop BFD, is in fact > opposite, not in support of TTL/HC = 1. RFC 5881, following on the > extensive discussion of the GTSM in RFC 5082, requires that TTL/HC for the > single-hop BFD be set to 255 and BFD packet discarded by a receiver if > TTL/HC != 255. I'll note that we had an extensive discussion with IESG on > the TTL/HC value in the case of BFD over VXLAN. We've agreed that a VXLAN > tunnel is as single-hop IP and thus TTL/HC MUST be set to 255. Not sure if > all this information was helpful. My $.02 > > Regards, > Greg > > On Thu, Mar 12, 2020 at 8:57 AM Tony Przygienda > wrote: > >> >> >>> > If the neighbor is directly connected, The destination address in >>> > IPv6 header SHOULD be the neighbor's link-local address on this >>> > router's outgoing interface, the source destination address SHOULD >>> be >>> > this router's link-local address on the outgoing interface, and the >>> > IPv6 TTL MUST be set to 1. >>> >>> I've started a thread on 6man/6ops re. link-local-tunnel traffic as i >>> have the same also in my ANIMA draft, and in implementations i have >>> seen quite some issues tunneling traffic HW accelerated across IPv6 >>> link-local addresses and TTL=1. >>> >>> Would welcome implementers in BIER to chime in if they would see this >>> as an issue. >>> >>> If folks feel supporting this HW accelerated might be more complicated >>> than non-link-local tunnels, then it might be useful to change the >>> text to also allow/require support for using the BFR address even for >>> subnet adjacent BFR. In that case one would not use HL=1, and that >>> too i have seen to be a problem in HW accelerated forwarding plane: >>> HL/TTL=1 -> MUST punt (software processing). >>> >> >> really? I'm surprised, actually, LL with TTL=1 for link local is an >> absolutely common case since years for e.g. BFD and other thinks like BGP >> sessions in many topologies so if a silicon does not support that it's a >> strange IPv6 silicon. But yes, supporting LL properly in IPv6 is non >> trivial (spec allows to have e.g. same LL on multiple interfaces in a >> node). The spec here says SHOULD and not MUST so it's perfectly find using >> any addresses (one could probably even use BFR prefix but that would lead >> to ECMP non-deterministic behavior which may or may not be OK depending on >> deployment). If that needs to be spelled out (albeit it's redundant) I'm >> not opposed to that. >> >> Please cc: bier working group on any discussion you are starting with >> 6man on the side ... Unless I missed my morning mail input ... >> >> --- tony >> >> >> >> >> _______________________________________________ >> BIER mailing list >> BIER@ietf.org >> https://www.ietf.org/mailman/listinfo/bier >> > --000000000000ebbc1c05a0af05c5 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I'm all for TTL=3D1. It's one thing having a = BFD frame run away, another a multicast frame ;-)=C2=A0 But yeah, worth dis= cussion on the list ...

--- tony

On= Thu, Mar 12, 2020 at 2:00 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Tony,
I think that= the example of LL BFD, i.e. single-hop BFD, is in fact opposite, not in su= pport of TTL/HC =3D 1. RFC 5881, following on the extensive discussion of t= he GTSM in RFC 5082, requires that TTL/HC for the single-hop BFD be set to = 255 and BFD packet discarded=C2=A0by a receiver if TTL/HC !=3D 255. I'l= l note that we had an extensive discussion with IESG on the TTL/HC value in= the case of BFD over VXLAN. We've agreed that a VXLAN tunnel is as sin= gle-hop IP and thus TTL/HC MUST be set to 255. Not sure if all this informa= tion was helpful. My $.02

Regards,
Greg<= /div>

On Thu, Mar 12, 2020 at 8:57 AM Tony Przygienda <tonysietf@gmail.com> wrote:
=

>=C2=A0 =C2=A0 If the neighbor is directly connected, The destination ad= dress in
>=C2=A0 =C2=A0 IPv6 header SHOULD be the neighbor's link-local addre= ss on this
>=C2=A0 =C2=A0 router's outgoing interface, the source destination a= ddress SHOULD be
>=C2=A0 =C2=A0 this router's link-local address on the outgoing inte= rface, and the
>=C2=A0 =C2=A0 IPv6 TTL MUST be set to 1.

I've started a thread on 6man/6ops re. link-local-tunnel traffic as i have the same also in my ANIMA draft, and in implementations i have
seen quite some issues tunneling traffic HW accelerated across IPv6
link-local addresses and TTL=3D1.

Would welcome implementers in BIER to chime in if they would see this
as an issue.

If folks feel supporting this HW accelerated might be more complicated
than non-link-local tunnels, then it might be useful to change the
text to also allow/require support for using the BFR address even for
subnet adjacent BFR. In that case one would not use HL=3D1, and that
too i have seen to be a problem in HW accelerated forwarding plane:
HL/TTL=3D1 -> MUST punt (software processing).

=
really? I'm surprised, actually, LL with TTL=3D1 for link lo= cal is an absolutely common case since years for e.g. BFD and other thinks = like BGP sessions in many topologies so if a silicon does not support that = it's a strange IPv6 silicon. But yes, supporting LL properly in IPv6 is= non trivial (spec allows to have e.g. same LL on multiple interfaces in a = node). The spec here says SHOULD and not MUST so it's perfectly find us= ing any addresses (one could probably even use BFR prefix but that would le= ad to ECMP non-deterministic behavior which may or may not be OK depending = on deployment).=C2=A0 If that needs to be spelled out (albeit it's redu= ndant) I'm not opposed to that.

Please cc= : bier working group on any discussion you are starting with 6man on the si= de ... Unless I missed my morning mail input ...

<= div>--- tony




_______________________________________________
BIER mailing list
BIER@ietf.org
https://www.ietf.org/mailman/listinfo/bier
--000000000000ebbc1c05a0af05c5-- From nobody Thu Mar 12 14:33:30 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A88953A043D for ; Thu, 12 Mar 2020 14:33:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id B9szY4npkkJs for ; Thu, 12 Mar 2020 14:33:26 -0700 (PDT) Received: from mail-io1-xd35.google.com (mail-io1-xd35.google.com [IPv6:2607:f8b0:4864:20::d35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 30D6F3A0443 for ; Thu, 12 Mar 2020 14:33:26 -0700 (PDT) Received: by mail-io1-xd35.google.com with SMTP id r15so7289882iog.0 for ; Thu, 12 Mar 2020 14:33:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=kf+/0Sk8juuMoiqzJyUV23Q9ppodYD0VVctoSk/1Dcs=; b=Wr8Z2IMq0UMi6pVFNNK2yGC8DKvowZSpVhQubRO8RtASpMZdfh7OrizIKttBG8wuJp nTyXM3/2PzbTLv20yZboZAblh327byO51b7vF7rEKX/hn3C15mGG8gmO5458ccWYTmZ4 oroXcMqIc1lczRtjXllCJui484d/+tAjZG/wroGnIfFo6wkpM22csFdGZaNb57oahpp6 khltL/UNNR+aRrkmalc9d+mLDDMvuL4HxFt/8ndOsVEqUpi+U+GoexawuDO5ga2tldDj l1u2W3cZd38AubsxdhB9a2IClo6mMKCbCn0oBOj+tnmdM6nzZvHzZ404mr7bioRPNhkh NqpA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=kf+/0Sk8juuMoiqzJyUV23Q9ppodYD0VVctoSk/1Dcs=; b=fcWfxjKdnxBP7YzZp3CtIN/0mgnegx+1stsLyot0WpB8OdLX0Jnh6H+AYwUq5ng+ec U6KVD/Y1sgJ4nFixfmCv0cSKFk63r1+aNeW685zi4X1FRNdEvETl6H+c3SR0uMjppayn h0aG2TNJoSDsSzVY4qP1lz+n9FPlwdch3nvnQC/Cu6o5I5RwlQZoVF9O7SB6UvWPROMo 4/zrfwXZoz0xdLXEF499qUljPkXnXf2cdLDhScgT12jYgp+3YjHaX7JUHQ+vKe1R5SSy osPxg8tVKNGv/JeT+bdDepxCQ7oGqJshDSxtKehwlTnNz+EzrcdtqxVlkSzCk2OuMq8Q 3MiA== X-Gm-Message-State: ANhLgQ0N/nFr6vXANIYzgAZn5IaukxhqFP3sx4orxOeBklTpOmDvcR6O rg6hfhdJqKn+OJkY2FxRnNx2/pv6ZTAAK680Hyc= X-Google-Smtp-Source: ADFU+vsN7YsWqmKIkr2z6toWhkv22EuDB/vPApFpx9Vx18ycralA9pQg1qQwxaZs5hTWHyiOIE/Ze8wBuMXpxIqwxR0= X-Received: by 2002:a02:8795:: with SMTP id t21mr1130970jai.121.1584048805436; Thu, 12 Mar 2020 14:33:25 -0700 (PDT) MIME-Version: 1.0 References: <20200312042429.GA12383@faui48f.informatik.uni-erlangen.de> <00788CA2-6F96-4AC5-BEB5-218C94AEC456@cisco.com> <20200312190230.GB17570@faui48f.informatik.uni-erlangen.de> <20200312202909.GC17570@faui48f.informatik.uni-erlangen.de> In-Reply-To: <20200312202909.GC17570@faui48f.informatik.uni-erlangen.de> From: Tony Przygienda Date: Thu, 12 Mar 2020 14:31:52 -0700 Message-ID: To: Toerless Eckert Cc: "Nagendra Kumar Nainar (naikumar)" , BIER WG Content-Type: multipart/alternative; boundary="0000000000005ae5fa05a0af1ae7" Archived-At: Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 21:33:29 -0000 --0000000000005ae5fa05a0af1ae7 Content-Type: text/plain; charset="UTF-8" Good rant but reread my Yakov quote. Yes, people will always love shortcuts and have ideas for their golden use case, this has little to do with the fact whether IETF should standardize it. As side input: _All_ silicon peopleI I talked to (well, maybe I just talked to sane silicon people ;-) considered decaps'ing far more desirable than option processing, no matter whether it's v4 or v6. They like to end up with a BIER frame they can throw @ BIER MPLS/non-MPLS block (and the silicon for tunnel encaps/decaps is very good & generic on all sane silicons AFAIU). Option processing is a mild nightmare, especially if you're not sure where they are and how big they get and once they blow you scratchpad size you end up re'circ the packet and pay 50% bandwidht penalty (or you double your scratchpad size paying a completley non-linear cost in real estate and power consumption) ... just my 2c but those guys are tied by electrons and mostly have strong opinions based on atoms they shuffle around ... --- tony On Thu, Mar 12, 2020 at 1:29 PM Toerless Eckert wrote: > On Thu, Mar 12, 2020 at 12:23:13PM -0700, Tony Przygienda wrote: > > > parsing failed. Can you plsease rephrase ? > > > > OK, if you use LL and TTL=1 you basically won't manage to send to wrong > > link or more than one hop so it forces a link-by-link L2.5 fabric which > is > > BIER architecture day one on standard RFC (+ exception allowed to _bypass > > non-BIER supporting nodes_). > > Sure, and we have L2 encap for that and should promote it and make sure > it will happen in IPv6 deployments. > > If LL IPv6 tunnels in forwarding plane would be used widely in othre IETF > technologies i would be less concerned. Right not it is not, and > so i am worried to have an IPv6 encap profile in our draft that makes > adoption most easy. > > > be. We can discuss out whether we should bput "SHOULD" with BIER prefix > > (I'm kind of leery of v6 global addressing since that's not always given) > > but then we need to talk how we deal with parallel links (or maybe we > don't > > have to given BIER only addresses whole BFR with a bit, I kind of didn't > do > > enough careful thinking here yet). > > > > > > > > > > > BIER is a switching fabric technology @ > > > > L2.5 and not an overlay (and yes, it can be used that way but this > is IMO > > > > jsut as far from BIER as BESS is from idr ;-) > > > > > > See my other discuss point about the IMHO most 'useful' modes of > > > deployment/forwarding. Those would be good to discuss in the drafts. > > > > > > Partial or full deployment of BIER with IPv6 encap: > > > BIFR-to-BFER IPv6 encapsulated, per-BIER-hop rewrite of IPv6 header > > > No differnce between partial or full deployment, > > > should work automatically calculating remote next-hop in partial. > > > > > > > There is somehow a huge misconception that as intermediate node you can > > "rewrite headers and options on v6 while keeping the source address"in > > flight > > Well, thats what SRH does. BIER also rewrites bitstring. > rewriting IPv6 dest and optional source should in general > be easier than actual decap+encap. Tell me if i am wrong. > > > and "adresses can encode my uncle's birthday" because "some people > > said so now" > > Where where you when embedded RP was standardized so that you can throw > stones ? ;-) > > My concern about SRH is that it is waste on midpoint SIDs not that > abuse of IPv6 addresses is bad. > > I liked Pierre's bitstring in IPv6 addr, i just felt it was too short to > be useful. > > I liked terrastreams QoS encoding in IPv6 addresses. > > If you want people to stop (ab)using IPv6 addresses, you need > to give operators other header elements in which to carry policy. > Flexible extensible not only by vendors. > > I tried to bring frameworks like this to IETF and was immediatly > confronted by the IETF perpass/privacy lobby: Routers should not know > anything. > > Ok, now i've run miles away from subject matter to my favourite soap box. > > > but the ultimately governing body are v6 working groups not > > us. In fact, AFAIR v6 specs you can't, almost without exceptions (see the > > raging discussions on SRv6 PHP, SRv6 basically breaking the "no v6 > address > > has semantics behind subnetting", mucking around with options they have > no > > business to muck with and so on).where v6 is acting as L2 basically and > not > > some end-2-end forwarding transport with semantics encoding. > > RFC8200 was written for uncontrolled internet paths, SRH/SRv6 was designed > for > controlled networks. Huge overhead as a result. If not for > (predecessors) of RFC8200 would have from the beginning been something > like CRH (which still has to argue representing IPv6 adddresses with > mapping to suite RFC8200). > > RFC8200 is a plane to travel the planet. No, its not ideal to drive on > highways, but nobody in the IETF wants to build a car. IPng process was > 30 years ago, and we still think its results is sufficient for all > futures. > > > If you start to shove BIER frames > > around tunnels to show up in arbitrary places it's like shoving MPLS > frames > > to weird places and expect "labels to work". A BIER bitmask is basically > a > > very weird label with really only local significance on the link and not > > using it correctly will make you expose BIER mask in places where they do > > the wrong stuff (just like MPLS labels). > > I don't buy that argument. All VPNs are overlay networks (PE to PE), and > operators know how to build them. Most L3 router networks are overlay > networks on top of an optical switched underlay providing p2p colored > connections, and those paths are often manually configured, similar to > what i did 30 years ago with X.25 PVCs. All 3G/4G/5G "core" networks > are overlays. Building overlays happens everywhere. Some are better, > some are worth, often in the eye of the beholder. > > > Yes, bypassing non-supporting > > nodes is ok if we control the semantics of that tightly but everything > else > > is basically brfeaking the architecture with a long tail fallout. BIER is > > carefully thought out and reviewed and lots of stuff has security/OAM/etc > > implications and that's what the WG is chartered to govern and not come > up > > with some "fashionable hacks" with the acronyms du jour. > > I think the best thing BIER can do is to promote the option of > automatic mapping from a self-intelligent underlay, aka: the > fully automatic IGP option described in rfc8297. > > I don't know how important partial upgrades/adoption of BIER within an > IGP domain is, but i have seen a lot of asks for this for prior IP > multicast technologies (especially in SPs), and it is so much easier now > with BIER given how we are relying on autoconfiguration via IGP > information. That makes it excitingly more attractive than the > problematic solutions we tried to build earlier where we where not > given the option to exten IGPs. > > > And yes, you can use BIER "in overlay" but that is not the current > charter > > of BIER WG as many other things are not. Or that would be a "BIER-BESS" > > group I guess ... > > Ethernet is also a useless overlay for p2p links. Can we please > only support HDLC headers ? SRv6 whether RH or CRH is always > an overlay. > > If we come up with a solution that allows smooth incremental adoption > of BIER in an IGP domain by using IPv6 encap as long as there are > no full ethernet encap paths, and then automatically switch to ethernet > encap paths unless there is a policy override ("operator loves IPv6 > encap or reuse IPv6 FRR), i think we are on a good path for the first > round document. > > The main issue i see is tht most multicst use is in VPNs, and i am > not sure we have a good VPN solution without MPLS without some > way to encapsulate destination SIDs like we have in MPLS. > > > And yes, "it's lame industry stuff" you're quoting, we have v6 standards > > track documents signed of and 6man to govern all that stuff and arguments > > along the lines "but my silicon doesn't do that" or "this implementation > is > > lousy" I'm sympathetic to but to quote Yakov here "I cannot prevent you > > doing whatever you want to do in your privacy with the spec I'm > publishing > > but do not ask me to standardize your stuff if it does not follow the > > governing architecture and needs interoperability". > > Its also bad to publish supposedly well-meaning architectures when > you're not the one having to suffer on its issues. Should i bring on > my rant about IPv6 scoped address architecture ? None of the folks who > wrote that ever thought about IPv6 multicast. > > At best, architectures are good intentions. If they are assumed to be > cast in stome they become dogmas. > > > And yes, please cross-post, I don't want 6man or spring to be led down > some > > garden path without being plugged in into the BIER working group where > the > > BIER technology is governed. > > Input from othre WGs is only that: Input. As i said, we do need to be > worried about them claiming they can prohibit options we as BIER like > to do - because of dogmas. > > Toerless > > > > --- tony > > -- > --- > tte@cs.fau.de > --0000000000005ae5fa05a0af1ae7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Good rant but reread my Yakov quote. Yes, people will= always love shortcuts and have ideas for their golden use case, this has l= ittle to do with the fact whether IETF should standardize it.

As side input: _All_ silicon peopleI I talked to (well, ma= ybe I just talked to sane silicon people ;-) considered decaps'ing far = more desirable than option processing, no matter whether it's v4 or v6.= They like to end up with a BIER frame they can throw @ BIER MPLS/non-MPLS = block (and the silicon for tunnel encaps/decaps is very good & generic = on all sane silicons AFAIU). Option processing is a mild nightmare, especia= lly if you're not sure where they are and how big they get and once the= y blow you scratchpad size you end up re'circ the packet and pay 50% ba= ndwidht penalty (or you double your scratchpad size paying a completley non= -linear cost in real estate and power consumption) ... just my 2c but those= guys are tied by electrons and mostly have strong opinions based on atoms = they shuffle around ...

--- tony

On= Thu, Mar 12, 2020 at 1:29 PM Toerless Eckert <tte@cs.fau.de> wrote:
On Thu, Mar 12, 2020 at 12:23:13PM -0700, Tony Przygie= nda wrote:
> > parsing failed. Can you plsease rephrase ?
>
> OK, if you use LL and TTL=3D1 you basically won't manage to send t= o wrong
> link or more than one hop so it forces a link-by-link L2.5 fabric whic= h is
> BIER architecture day one on standard RFC (+ exception allowed to _byp= ass
> non-BIER supporting nodes_).

Sure, and we have L2 encap for that and should promote it and make sure
it will happen in IPv6 deployments.

If LL IPv6 tunnels in forwarding plane would be used widely in othre IETF technologies i would be less concerned. Right not it is not, and
so i am worried to have an IPv6 encap profile in our draft that makes
adoption most easy.

> be. We can discuss out whether we should bput "SHOULD" with = BIER prefix
> (I'm kind of leery of v6 global addressing since that's not al= ways given)
> but then we need to talk how we deal with parallel links (or maybe we = don't
> have to given BIER only addresses whole BFR with a bit, I kind of didn= 't do
> enough careful thinking here yet).
>
>
> >
> > > BIER is a switching fabric technology @
> > > L2.5 and not an overlay (and yes, it can be used that way bu= t this is IMO
> > > jsut as far from BIER as BESS is from idr ;-)
> >
> > See my other discuss point about the IMHO most 'useful' m= odes of
> > deployment/forwarding. Those would be good to discuss in the draf= ts.
> >
> > Partial or full deployment of BIER with IPv6 encap:
> >=C2=A0 =C2=A0BIFR-to-BFER IPv6 encapsulated, per-BIER-hop rewrite = of IPv6 header
> >=C2=A0 =C2=A0No differnce between partial or full deployment,
> >=C2=A0 =C2=A0 =C2=A0 should work automatically calculating remote = next-hop in partial.
> >
>
> There is somehow a huge misconception that as intermediate node you ca= n
> "rewrite headers and options on v6 while keeping the source addre= ss"in
> flight

Well, thats what SRH does. BIER also rewrites bitstring.
rewriting IPv6 dest and optional source should in general
be easier than actual decap+encap. Tell me if i am wrong.

> and "adresses can encode my uncle's birthday" because &q= uot;some people
> said so now"

Where where you when embedded RP was standardized so that you can throw sto= nes ? ;-)

My concern about=C2=A0 SRH is that it is waste on midpoint SIDs not that abuse of IPv6 addresses is bad.

I liked Pierre's bitstring in IPv6 addr, i just felt it was too short t= o be useful.

I liked terrastreams QoS encoding in IPv6 addresses.

If you want people to stop (ab)using IPv6 addresses, you need
to give operators other header elements in which to carry policy.
Flexible extensible not only by vendors.

I tried to bring frameworks like this to IETF and was immediatly
confronted by the IETF perpass/privacy lobby: Routers should not know
anything.

Ok, now i've run miles away from subject matter to my favourite soap bo= x.

> but the ultimately governing body are v6 working groups not
> us. In fact, AFAIR v6 specs you can't, almost without exceptions (= see the
> raging discussions on SRv6 PHP, SRv6 basically breaking the "no v= 6 address
> has semantics behind subnetting", mucking around with options the= y have no
> business to muck with and so on).where v6 is acting as L2 basically an= d not
> some end-2-end forwarding transport with semantics encoding.

RFC8200 was written for uncontrolled internet paths, SRH/SRv6 was designed = for
controlled networks. Huge overhead as a result. If not for
(predecessors) of RFC8200 would have from the beginning been something
like CRH (which still has to argue representing IPv6 adddresses with
mapping to suite RFC8200).

RFC8200 is a plane to travel the planet. No, its not ideal to drive on
highways, but nobody in the IETF wants to build a car. IPng process was
30 years ago, and we still think its results is sufficient for all
futures.

> If you start to shove BIER frames
> around tunnels to show up in arbitrary places it's like shoving MP= LS frames
> to weird places and expect "labels to work". A BIER bitmask = is basically a
> very weird label with really only local significance on the link and n= ot
> using it correctly will make you expose BIER mask in places where they= do
> the wrong stuff (just like MPLS labels).

I don't buy that argument. All VPNs are overlay networks (PE to PE), an= d
operators know how to build them. Most L3 router networks are overlay
networks on top of an optical switched underlay providing p2p colored
connections, and those paths are often manually configured, similar to
what i did 30 years ago with X.25 PVCs. All 3G/4G/5G "core" netwo= rks
are overlays. Building overlays happens everywhere. Some are better,
some are worth, often in the eye of the beholder.

> Yes, bypassing non-supporting
> nodes is ok if we control the semantics of that tightly but everything= else
> is basically brfeaking the architecture with a long tail fallout. BIER= is
> carefully thought out and reviewed and lots of stuff has security/OAM/= etc
> implications and that's what the WG is chartered to govern and not= come up
> with some "fashionable hacks" with the acronyms du jour.

I think the best thing BIER can do is to promote the option of
automatic mapping from a self-intelligent underlay, aka: the
fully automatic IGP option described in rfc8297.

I don't know how important partial upgrades/adoption of BIER within an<= br> IGP domain is, but i have seen a lot of asks for this for prior IP
multicast technologies (especially in SPs), and it is so much easier now with BIER given how we are relying on autoconfiguration via IGP
information. That makes it excitingly more attractive than the
problematic solutions we tried to build earlier where we where not
given the option to exten IGPs.

> And yes, you can use BIER "in overlay" but that is not the c= urrent charter
> of BIER WG as many other things are not. Or that would be a "BIER= -BESS"
> group I guess ...

Ethernet is also a useless overlay for p2p links. Can we please
only support HDLC headers ? SRv6 whether RH or CRH is always
an overlay.

If we come up with a solution that allows smooth incremental adoption
of BIER in an IGP domain by using IPv6 encap as long as there are
no full ethernet encap paths, and then automatically switch to=C2=A0 ethern= et
encap paths unless there is a policy override ("operator loves IPv6 encap or reuse IPv6 FRR), i think we are on a good path for the first
round document.

The main issue i see is tht most multicst use is in VPNs, and i am
not sure we have a good VPN solution without MPLS without some
way to encapsulate destination SIDs like we have in MPLS.

> And yes, "it's lame industry stuff" you're quoting, = we have v6 standards
> track documents signed of and 6man to govern all that stuff and argume= nts
> along the lines "but my silicon doesn't do that" or &quo= t;this implementation is
> lousy" I'm sympathetic to but to quote Yakov here "I can= not prevent you
> doing whatever you want to do in your privacy with the spec I'm pu= blishing
> but do not ask me to standardize your stuff if it does not follow the<= br> > governing architecture and needs interoperability".

Its also bad to publish supposedly well-meaning architectures when
you're not the one having to suffer on its issues. Should i bring on my rant about IPv6 scoped address architecture ? None of the folks who
wrote that ever thought about IPv6 multicast.

At best, architectures are good intentions. If they are assumed to be
cast in stome they become dogmas.

> And yes, please cross-post, I don't want 6man or spring to be led = down some
> garden path without being plugged in into the BIER working group where= the
> BIER technology is governed.

Input from othre WGs is only that: Input. As i said, we do need to be
worried about them claiming they can prohibit options we as BIER like
to do - because of dogmas.

Toerless
>
> --- tony

--
---
tte@cs.fau.de
--0000000000005ae5fa05a0af1ae7-- From nobody Thu Mar 12 14:36:12 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9697D3A053F; Thu, 12 Mar 2020 14:36:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.87 X-Spam-Level: X-Spam-Status: No, score=-0.87 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JEfVGlj5rS7R; Thu, 12 Mar 2020 14:36:08 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 857DA3A04BB; Thu, 12 Mar 2020 14:36:07 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [131.188.34.52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id CADD954842F; Thu, 12 Mar 2020 22:36:01 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id C41F0440040; Thu, 12 Mar 2020 22:36:01 +0100 (CET) Date: Thu, 12 Mar 2020 22:36:01 +0100 From: Toerless Eckert To: Mark Smith Cc: 6MAN <6man@ietf.org>, v6ops list , bier@ietf.org Message-ID: <20200312213601.GB34894@faui48f.informatik.uni-erlangen.de> References: <20200312000016.GO54522@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] [v6ops] IPv6 link-local traffic questions X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 21:36:10 -0000 On Thu, Mar 12, 2020 at 12:18:32PM +1100, Mark Smith wrote: > RFC4007 allows packets with link-local destinations to be forwarded > by a router, but only back onto the same link: Oh, my favourite coffin nail RFC. > "Thus, if a > router receives a packet with a link-local destination address that > is not one of the router's own link-local addresses on the arrival > link, the router is expected to try to forward the packet to the > destination on that link (subject to successful determination of the > destination's link-layer address via the Neighbor Discovery protocol > [9]). The forwarded packet may be transmitted back through the > arrival interface, or through any other interface attached to the > same link." > > > I think in theory that could also mean forwarded to another router on > the link that then forwards back again onto the link etc., so it is > valid for a packet with a link-local destination address to have an > initial Hop Count value that allows it to be forwarded by multiple > routers, all limited to being forwarded within the same link. So this behavior breaks both TTL=1 and RFC5082 packets. Nice. This RFC is getting better every time i learn more of it. > This draft might be useful, as it collects together and summarises > information about using Link-Local Addresses (and is something I've > been meaning to get back to updating, suggestions welcome): > > How to use IPv6 Link-Local Addresses in Applications > https://tools.ietf.org/html/draft-smith-ipv6-link-locals-apps-00 Nice. Let me split that off. cheers Toerless From nobody Thu Mar 12 15:56:53 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CCB943A0410; Thu, 12 Mar 2020 15:56:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.65 X-Spam-Level: X-Spam-Status: No, score=-1.65 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id O9EsQ8-cKZ50; Thu, 12 Mar 2020 15:56:48 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BBA4A3A07C5; Thu, 12 Mar 2020 15:56:47 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [131.188.34.52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 4F7B9548431; Thu, 12 Mar 2020 23:56:42 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id 46758440040; Thu, 12 Mar 2020 23:56:42 +0100 (CET) Date: Thu, 12 Mar 2020 23:56:42 +0100 From: Toerless Eckert To: Alvaro Retana Cc: Tony Przygienda , BIER WG , bier-ads@ietf.org, iana@iana.org, BIER WG Chairs Message-ID: <20200312225642.GA24215@faui48f.informatik.uni-erlangen.de> References: <20200311225102.GB2331@faui48f.informatik.uni-erlangen.de> <20200312043703.GE2331@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] Ethertype for non-MPLS BIER suggestion X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 22:56:51 -0000 Thanks, Alvaro. If you have a reliable queue system, feel free to put it on the bottom, i just stumbled across it when tracing something more relevant and thought i would forget it if i didn't rise it now as an issue. YOu certainly will have more important things to do right now. Cheers Toeress On Thu, Mar 12, 2020 at 09:00:39PM +0000, Alvaro Retana wrote: > Hi! > > I didn???t make this request, but according to the policy the request to the > IEEE RA is to be made after approval for publication???but before the RFC is > published. I guess that???s how we got in this situation. > > I assume that the way to update the entry is to contact the IEEE RA. I > sent a message to the IEEE/IETF coordination team ??? with any luck, they > have a simple process for an update and we can take care of this (and > potentially other entries). > > I???ll then take the AI. > > Alvaro. > > On March 12, 2020 at 3:29:41 PM, Tony Przygienda (tonysietf@gmail.com) > wrote: > > yeah, not something I want to chase right now but I get your point. In case > you get enlightened how the description can be updated, let me know and > we'll start chasing it ... > > --- tony > > On Wed, Mar 11, 2020 at 9:37 PM Toerless Eckert wrote: > > > I never finalized getting ethertypes from IEEE > > myself yet, so not sure about the processes. > > > > Would be nice if IANA or some other designated entity > > could take ownership of these assignments, right now > > the 8 ethertypes mentioning drafts which are all RFCs > > now are all over the place. "TRILL WG", routing-area > > or even "Cisco" (SFC/NSH). > > > > > > On Wed, Mar 11, 2020 at 09:01:39PM -0700, Tony Przygienda wrote: > > > oh, I see. no idea what the proper "update" procedure in IEEE is. Someone > > > feels like ferreting that out? > > > > > > > > > On Wed, Mar 11, 2020 at 9:00 PM Tony Przygienda > > wrote: > > > > > > > I'm surprised, there was an official liaison and assignment from IEEE > > of > > > > the ethertype. Alia handled it while I remember having filed _the_ > > forms > > > > ;-) for her ... > > > > > > > > --- tony > > > > > > > > On Wed, Mar 11, 2020 at 3:51 PM Toerless Eckert wrote: > > > > > > > >> Dear IANA, BIER leadership > > > >> > > > >> Not sure what normal IANA procedures are (or for that matter IEEE > > > >> procedures), > > > >> but: > > > >> > > > >> I would appreciate if there was an attempt made to update the > > following > > > >> record with IEEE: > > > >> > > > >> http://standards-oui.ieee.org/ethertype/eth.txt > > > >> > > > >> > > > >> AB37 IETF Routing Area Please read > > > >> draft-ietf-bier-mpls-encapsulation-12 at > > > >> 5177 Brandin Court > > > >> https://datatracker.ietf.org/doc/draft-ietf-bier-mpls-encapsulation/.. > > > >> > > > >> Fremont CA 94538 > > > >> > > > >> US > > > >> > > > >> Aka: Ask IEEE to change explanatory text to rfc8296 > > > >> > > > >> And for that matter, maybe IANA could check the other 7 entries of > > > >> "draft-ietf" in that registry, and get them updated accordingly. > > > >> > > > >> Cheers > > > >> Toerless > > > >> > > > >> P.S.: Great to see Routing Area has a physical mailbox address at the > > > >> LLC. Is that the right way to send snail mail to our AD's ? (don't > > > >> answer, just kidding). > > > >> > > > > > > > > > _______________________________________________ > > > BIER mailing list > > > BIER@ietf.org > > > https://www.ietf.org/mailman/listinfo/bier > > > > > > -- > > --- > > tte@cs.fau.de > > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier -- --- tte@cs.fau.de From nobody Thu Mar 12 16:49:56 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D891A3A097C; Thu, 12 Mar 2020 16:49:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BQrBKjXWtNKs; Thu, 12 Mar 2020 16:49:50 -0700 (PDT) Received: from mail-oi1-x22d.google.com (mail-oi1-x22d.google.com [IPv6:2607:f8b0:4864:20::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C82D53A0970; Thu, 12 Mar 2020 16:49:50 -0700 (PDT) Received: by mail-oi1-x22d.google.com with SMTP id d63so7477219oig.6; Thu, 12 Mar 2020 16:49:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=XU0LdsXsBe6uodzGKHWtmCd2ewttHvmU2WvJECZKEbg=; b=oXSck3Nl19Z25g3sHi84B57PEzNpFxjdNr49sZ0GRcHcIRumTkniox9pctblQlUTrD aNzLCS8P1+Li+DNQdFRnuhsW25cxdecdo6NdU/+E1v0jLa0eBYGz+p6CwE7mWbAgSP0w 3EdyF5pCX127u6Hh6iHhCeeJEc0e+WhLu2SBbFvrxx8nPK9GnItQ/aLLBeX6yyBAVOWp vonXbCYWQNpdNLjnOKH6f/boejatJ6qZ/6jiCBdIavcFGiOho45RMs2uFKgjM//6lf5F FsMaAQqyHEwn+Y+oHV86n9DvSg1mNN3+WWGKs2mIkx/DDRRyZ4WU1hNbYKxHr0MaeZcl XErg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=XU0LdsXsBe6uodzGKHWtmCd2ewttHvmU2WvJECZKEbg=; b=b38nug5j5m9+YmnJIsJhGJadr5ebOcPq5oYFzhihQVl3x00gxBQgOt1oZfhM2HDhl+ 2kx3b84KpopQRSNn76B8Ru2BO15ciiLwm7Xef0la4Yj219J9SWAubePyxGHVdpNThQvu LE/fnAa9lt4kOXcxUDWvriSgKPIy95SdR81NN4dgl/8377sx64OU/sO29vZLAN5CMNZP DtuwNy4wlt4dzCx1azV8JLKr9UzjL/H/ka+bIZFF3p+XsUXb9+Lwr/mwz8cGxoYnSUZg ZkMsAiXZhN42Z88f1XfgdoStGynFFxZw2eY8t9YHtzsmPQBH/qFoLEwt3VEOEeUL/QCJ +ZMg== X-Gm-Message-State: ANhLgQ19nYTvgJF5wWfqiFwMv58kSnBwTM3Uf+OW4OhjPeBaBlghd9mz DiB2YLYtEr9yCRy1tf7onJlLxIlczESzfV4/izI= X-Google-Smtp-Source: ADFU+vvz9pF2+dcxDgS/hYDcoesmJsHPZwBF2UNiEu0KUfFvVbmVa6RGDqzmPeH5zFRvr07OCOBwP3umHnIf6VRC0Pc= X-Received: by 2002:aca:3196:: with SMTP id x144mr421758oix.77.1584056990108; Thu, 12 Mar 2020 16:49:50 -0700 (PDT) MIME-Version: 1.0 References: <20200312000016.GO54522@faui48f.informatik.uni-erlangen.de> <20200312213601.GB34894@faui48f.informatik.uni-erlangen.de> In-Reply-To: <20200312213601.GB34894@faui48f.informatik.uni-erlangen.de> From: Erik Kline Date: Thu, 12 Mar 2020 16:49:39 -0700 Message-ID: To: Toerless Eckert Cc: Mark Smith , bier@ietf.org, v6ops list , 6MAN <6man@ietf.org> Content-Type: multipart/alternative; boundary="000000000000330f7605a0b102eb" Archived-At: Subject: Re: [Bier] [v6ops] IPv6 link-local traffic questions X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 23:49:55 -0000 --000000000000330f7605a0b102eb Content-Type: text/plain; charset="UTF-8" On Thu, Mar 12, 2020 at 2:36 PM Toerless Eckert wrote: > On Thu, Mar 12, 2020 at 12:18:32PM +1100, Mark Smith wrote: > > RFC4007 allows packets with link-local destinations to be forwarded > > by a router, but only back onto the same link: > > Oh, my favourite coffin nail RFC. > > > "Thus, if a > > router receives a packet with a link-local destination address that > > is not one of the router's own link-local addresses on the arrival > > link, the router is expected to try to forward the packet to the > > destination on that link (subject to successful determination of the > > destination's link-layer address via the Neighbor Discovery protocol > > [9]). The forwarded packet may be transmitted back through the > > arrival interface, or through any other interface attached to the > > same link." > > > > > > I think in theory that could also mean forwarded to another router on > > the link that then forwards back again onto the link etc., so it is > > valid for a packet with a link-local destination address to have an > > initial Hop Count value that allows it to be forwarded by multiple > > routers, all limited to being forwarded within the same link. > > So this behavior breaks both TTL=1 and RFC5082 packets. > > Nice. This RFC is getting better every time i learn more of it. > My personal experience is that 255 is standard for link-local unicast communications, and 1 is commonly used for link-local multicast. > This draft might be useful, as it collects together and summarises > > information about using Link-Local Addresses (and is something I've > > been meaning to get back to updating, suggestions welcome): > > > > How to use IPv6 Link-Local Addresses in Applications > > https://tools.ietf.org/html/draft-smith-ipv6-link-locals-apps-00 > > Nice. > > Let me split that off. > > cheers > Toerless > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- > --000000000000330f7605a0b102eb Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=
On Thu, Mar 12, 2020 at 2:36 PM Toerl= ess Eckert <tte@cs.fau.de> wrote= :
On Thu, Mar 12= , 2020 at 12:18:32PM +1100, Mark Smith wrote:
> RFC4007=C2=A0 allows packets with link-local destinations to be forwar= ded
> by a router, but only back onto the same link:

Oh, my favourite coffin nail RFC.

> "Thus, if a
>=C2=A0 =C2=A0 router receives a packet with a link-local destination ad= dress that
>=C2=A0 =C2=A0 is not one of the router's own link-local addresses o= n the arrival
>=C2=A0 =C2=A0 link, the router is expected to try to forward the packet= to the
>=C2=A0 =C2=A0 destination on that link (subject to successful determina= tion of the
>=C2=A0 =C2=A0 destination's link-layer address via the Neighbor Dis= covery protocol
>=C2=A0 =C2=A0 [9]).=C2=A0 The forwarded packet may be transmitted back = through the
>=C2=A0 =C2=A0 arrival interface, or through any other interface attache= d to the
>=C2=A0 =C2=A0 same link."
>
>
> I think in theory that could also mean forwarded to another router on<= br> > the link that then forwards back again onto the link etc., so it is > valid for a packet with a link-local destination address to have an > initial Hop Count value that allows it to be forwarded by multiple
> routers, all limited to being forwarded within the same link.

So this behavior breaks both TTL=3D1 and RFC5082 packets.

Nice. This RFC is getting better every time i learn more of it.

My personal experience is that 255 is standard for= link-local unicast communications, and 1 is commonly used for link-local m= ulticast.

> This draft might be useful, as it collects together and summarises
> information about using Link-Local Addresses (and is something I'v= e
> been meaning to get back to updating, suggestions welcome):
>
> How to use IPv6 Link-Local Addresses in Applications
> https://tools.ietf.org/html/dra= ft-smith-ipv6-link-locals-apps-00

Nice.

Let me split that off.

cheers
=C2=A0 =C2=A0 Toerless

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--000000000000330f7605a0b102eb-- From nobody Thu Mar 12 17:06:44 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E21643A09D4; Thu, 12 Mar 2020 17:06:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nu_GK0CJwFCa; Thu, 12 Mar 2020 17:06:35 -0700 (PDT) Received: from mail-il1-x132.google.com (mail-il1-x132.google.com [IPv6:2607:f8b0:4864:20::132]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C6D163A09D2; Thu, 12 Mar 2020 17:06:35 -0700 (PDT) Received: by mail-il1-x132.google.com with SMTP id a14so7242588ilk.6; Thu, 12 Mar 2020 17:06:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=7/l0evnKDVFmClRi56IAYcO/sSQgdv6ZZlgMVrJHA10=; b=ZWu5Om56UaFrLg4gbo5opUGJ4N4XUE8UzUO8KkVYrQ3j21+i69Olqgbh3RhOnFJg3S eNMRHaYu1izYaQybgDqetmE6y8UGDfDi3gIRB7B9Ng09lFUyOf83n5qORMJPzPNuIotv tDTmJN7HBA1K8NFfE5Oa/uqo/4r3edMZper1wzlzR67zb00nnfuPlVRdTWk6+uXdwr0E xkYvAiqay6e3fb/Risw+znbx7ZZm17fHJNZDb7vZhvmUa9KIY3rYWj6S5Zw5KIxTgxk/ gSW1lIjrrc7CimDIt2mf9x6sW1z3FxNx8/EnaGtyiV+CXOrbwIun+EP6hodEChpKs/zN jlqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=7/l0evnKDVFmClRi56IAYcO/sSQgdv6ZZlgMVrJHA10=; b=b1X9LyJAUWhzAoc3VRdC/HmhUrf+5u/Lf1lfEyLLWT7vEozLoUVVtMe74CzUDu2a5S i7UhnwCwWsYU6o7xM/DFycnNw71vwCLTyoitYbFwphg0ay5qehVVxj/kalYm1vym0URD CLmCTZKNuuflGPIPc9HwlpfFZFl55v8XvEzow8WBa6XnK89XuTiaJfqj0TJCIL5i+DF9 jkavhcbT3sIH0skjTsDk1iQM0CF3vEhyGgnPenR2MLNCrmPofPTrvhi3GZh6HF8Nw7vf 6HSMgClKiv8Y1qkFaPZ/I94QqZWyY81AE5YJLsFRR8Xsd0jiNjjcRumuu9rIbAOI2UCC 101g== X-Gm-Message-State: ANhLgQ2cSXil76Cvw755m6h/WXh97gMoLLGXndqK9k/cXuI1bLLwB6Go 6tlpBjkD3dfbeTnZRoP2JsHsWu2yErhcEEBkkS8eDNby X-Google-Smtp-Source: ADFU+vsTfFQYcdMKYMzN7wKvyqLhI8+sf0PPf9mKNtU2ZhIsPAW8GrB/Ey7AwP/hSOlpP1owOejgmhkUc/fJQjGHnQ0= X-Received: by 2002:a92:ce04:: with SMTP id b4mr5190593ilo.269.1584057995059; Thu, 12 Mar 2020 17:06:35 -0700 (PDT) MIME-Version: 1.0 References: <20200312000016.GO54522@faui48f.informatik.uni-erlangen.de> <20200312213601.GB34894@faui48f.informatik.uni-erlangen.de> In-Reply-To: From: Tony Przygienda Date: Thu, 12 Mar 2020 17:05:01 -0700 Message-ID: To: Erik Kline Cc: Toerless Eckert , 6MAN <6man@ietf.org>, v6ops list , BIER WG , Mark Smith Content-Type: multipart/alternative; boundary="000000000000196a4b05a0b13e18" Archived-At: Subject: Re: [Bier] [v6ops] IPv6 link-local traffic questions X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Mar 2020 00:06:38 -0000 --000000000000196a4b05a0b13e18 Content-Type: text/plain; charset="UTF-8" interesting exchange and Erik's last observation (ttl=1 and LL for multicast) puts it on the point, we are talking here a suggestion for BIER control plane where the contained packet is multicast. I would hate to see a multicast packet due to TTL > 1 end up in funky place and replicated there. Another interesting question is what if the LL source and destination are the same and TTL>1 but AFAIK that cannot happen since LL is generated using EUI-64 (albeit to my surprise I saw enough customers running same LL address on all links of a device & this is valid :-/ That aside, as I mentioned to Toerless that LL with TTL=1 is usual stuff since long time, we are talking here either something like BFD router to router or now in case of BIER it's suggested to be used as "implicit one hop tunnel" basically carrying BIER frame router-to-router instead of ether encaps (since BIER is L2.5, strictly speaking "abusing" v6 as transport is bit rich but it satisfies things like HOMENET which need mutlicast very nicely where the silicon doesn't need to process BIER but processes naive v6 easily, after v6 decaps it can go to slow path since HOMENET doesn't need any serious mcast throughtput [but nothing special AFAIS if the silicon chooses to process it after the decaps when demand arises or when used e.g. in core]) thanks --- tony On Thu, Mar 12, 2020 at 4:50 PM Erik Kline wrote: > > > On Thu, Mar 12, 2020 at 2:36 PM Toerless Eckert wrote: > >> On Thu, Mar 12, 2020 at 12:18:32PM +1100, Mark Smith wrote: >> > RFC4007 allows packets with link-local destinations to be forwarded >> > by a router, but only back onto the same link: >> >> Oh, my favourite coffin nail RFC. >> >> > "Thus, if a >> > router receives a packet with a link-local destination address that >> > is not one of the router's own link-local addresses on the arrival >> > link, the router is expected to try to forward the packet to the >> > destination on that link (subject to successful determination of the >> > destination's link-layer address via the Neighbor Discovery protocol >> > [9]). The forwarded packet may be transmitted back through the >> > arrival interface, or through any other interface attached to the >> > same link." >> > >> > >> > I think in theory that could also mean forwarded to another router on >> > the link that then forwards back again onto the link etc., so it is >> > valid for a packet with a link-local destination address to have an >> > initial Hop Count value that allows it to be forwarded by multiple >> > routers, all limited to being forwarded within the same link. >> >> So this behavior breaks both TTL=1 and RFC5082 packets. >> >> Nice. This RFC is getting better every time i learn more of it. >> > > My personal experience is that 255 is standard for link-local unicast > communications, and 1 is commonly used for link-local multicast. > > > This draft might be useful, as it collects together and summarises >> > information about using Link-Local Addresses (and is something I've >> > been meaning to get back to updating, suggestions welcome): >> > >> > How to use IPv6 Link-Local Addresses in Applications >> > https://tools.ietf.org/html/draft-smith-ipv6-link-locals-apps-00 >> >> Nice. >> >> Let me split that off. >> >> cheers >> Toerless >> >> -------------------------------------------------------------------- >> IETF IPv6 working group mailing list >> ipv6@ietf.org >> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> -------------------------------------------------------------------- >> > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier > --000000000000196a4b05a0b13e18 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
interesting exchange and Erik's last observation = (ttl=3D1 and LL for multicast) puts it on the point, we are talking here a = suggestion for BIER control plane where the contained packet is multicast. = I would hate to see a multicast packet due to TTL > 1 end up in funky pl= ace and replicated there.

Another interesting= question is what if the LL source and destination are the same and TTL>= 1 but AFAIK that cannot happen since LL is generated using EUI-64 (albeit t= o my surprise I saw enough customers running same LL address on all links o= f a device & this is valid :-/

That aside,= as I mentioned to Toerless that LL with TTL=3D1 is usual stuff since long = time, we are talking here either something like BFD router to router or now= in case of BIER it's suggested to be used as "implicit one hop tu= nnel" basically carrying BIER frame router-to-router instead of ether = encaps (since BIER is L2.5, strictly speaking "abusing" v6 as tra= nsport is bit rich but it satisfies things like HOMENET which need mutlicas= t very nicely where the silicon doesn't need to process BIER but proces= ses naive v6 easily, after v6 decaps it can go to slow path since HOMENET d= oesn't need any serious mcast throughtput [but nothing special AFAIS if= the silicon chooses to process it after the decaps when demand arises or w= hen used e.g. in core])

thanks

--- tony



=
On Thu, Ma= r 12, 2020 at 4:50 PM Erik Kline <e= k.ietf@gmail.com> wrote:


On Thu, Mar 12, 2020= at 2:36 PM Toerless Eckert <tte@cs.fau.de> wrote:
On Thu, Mar 12, 2020 at 12:18:32PM +1100, Mark Smith w= rote:
> RFC4007=C2=A0 allows packets with link-local destinations to be forwar= ded
> by a router, but only back onto the same link:

Oh, my favourite coffin nail RFC.

> "Thus, if a
>=C2=A0 =C2=A0 router receives a packet with a link-local destination ad= dress that
>=C2=A0 =C2=A0 is not one of the router's own link-local addresses o= n the arrival
>=C2=A0 =C2=A0 link, the router is expected to try to forward the packet= to the
>=C2=A0 =C2=A0 destination on that link (subject to successful determina= tion of the
>=C2=A0 =C2=A0 destination's link-layer address via the Neighbor Dis= covery protocol
>=C2=A0 =C2=A0 [9]).=C2=A0 The forwarded packet may be transmitted back = through the
>=C2=A0 =C2=A0 arrival interface, or through any other interface attache= d to the
>=C2=A0 =C2=A0 same link."
>
>
> I think in theory that could also mean forwarded to another router on<= br> > the link that then forwards back again onto the link etc., so it is > valid for a packet with a link-local destination address to have an > initial Hop Count value that allows it to be forwarded by multiple
> routers, all limited to being forwarded within the same link.

So this behavior breaks both TTL=3D1 and RFC5082 packets.

Nice. This RFC is getting better every time i learn more of it.

My personal experience is that 255 is standard for= link-local unicast communications, and 1 is commonly used for link-local m= ulticast.

> This draft might be useful, as it collects together and summarises
> information about using Link-Local Addresses (and is something I'v= e
> been meaning to get back to updating, suggestions welcome):
>
> How to use IPv6 Link-Local Addresses in Applications
> https://tools.ietf.org/html/dra= ft-smith-ipv6-link-locals-apps-00

Nice.

Let me split that off.

cheers
=C2=A0 =C2=A0 Toerless

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--000000000000196a4b05a0b13e18-- From nobody Thu Mar 12 17:12:15 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5EF763A09EC for ; Thu, 12 Mar 2020 17:12:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.65 X-Spam-Level: X-Spam-Status: No, score=-1.65 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QPWkw9Pfz-86 for ; Thu, 12 Mar 2020 17:12:11 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D15253A0945 for ; Thu, 12 Mar 2020 17:12:10 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [131.188.34.52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id C20C2548431; Fri, 13 Mar 2020 01:12:04 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id A55BD440040; Fri, 13 Mar 2020 01:12:04 +0100 (CET) Date: Fri, 13 Mar 2020 01:12:04 +0100 From: Toerless Eckert To: Tony Przygienda Cc: "Nagendra Kumar Nainar (naikumar)" , BIER WG Message-ID: <20200313001204.GB24215@faui48f.informatik.uni-erlangen.de> References: <20200312042429.GA12383@faui48f.informatik.uni-erlangen.de> <00788CA2-6F96-4AC5-BEB5-218C94AEC456@cisco.com> <20200312190230.GB17570@faui48f.informatik.uni-erlangen.de> <20200312202909.GC17570@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Mar 2020 00:12:13 -0000 Inline On Thu, Mar 12, 2020 at 02:31:52PM -0700, Tony Przygienda wrote: > Good rant but reread my Yakov quote. Yes, people will always love shortcuts > and have ideas for their golden use case, this has little to do with the > fact whether IETF should standardize it. > > As side input: _All_ silicon peopleI I talked to (well, maybe I just talked > to sane silicon people ;-) considered decaps'ing far more desirable than Who is sane, the silicon or the people ? ;-) > option processing, no matter whether it's v4 or v6. They like to end up > with a BIER frame they can throw @ BIER MPLS/non-MPLS block (and the > silicon for tunnel encaps/decaps is very good & generic on all sane > silicons AFAIU). That's fine. Thats independent of the possible optimization that you probably can do re-encap easier when you already had the same header before decap (just moving pointer forward to BIER header and the backward later). > Option processing is a mild nightmare, especially if > you're not sure where they are and how big they get and once they blow you > scratchpad size you end up re'circ the packet and pay 50% bandwidht penalty > (or you double your scratchpad size paying a completley non-linear cost in > real estate and power consumption) ... just my 2c but those guys are tied > by electrons and mostly have strong opinions based on atoms they shuffle > around ... I'l compress that into "silicon hates variable offsets it need to calculate through lookups". Yes, i hate that limitation and want to get it changed, but agree that for todays reality its good to live with it. Actually i do like to see this as part of explanation in our document. The idea from xie's draft that we could actually consider forcing compliance of our defined header from that semantic being attached to the desstination address, handling it like a SID would IMHO actually be the best way to make life for this silicon easier: The FIB lookup for this destination address immediately implies that this the next processing is BIER header at offset . Maybe only as an optimization option. This would still allow us to use either NH (sandy) or DO (xie) for the BIER header. The bigger issue is how we support the VPN solutions IMHO. Ideally we would allow for an SRH/CRH header that would be processed after BFER processing, to provide the additional context / processing SIDs to the application on the BFER. But how could we place it so that it doesn't impact the efficient BIER forwarding. Without creating a third IPv6 header... Cheers Toerless > > --- tony > > On Thu, Mar 12, 2020 at 1:29 PM Toerless Eckert wrote: > > > On Thu, Mar 12, 2020 at 12:23:13PM -0700, Tony Przygienda wrote: > > > > parsing failed. Can you plsease rephrase ? > > > > > > OK, if you use LL and TTL=1 you basically won't manage to send to wrong > > > link or more than one hop so it forces a link-by-link L2.5 fabric which > > is > > > BIER architecture day one on standard RFC (+ exception allowed to _bypass > > > non-BIER supporting nodes_). > > > > Sure, and we have L2 encap for that and should promote it and make sure > > it will happen in IPv6 deployments. > > > > If LL IPv6 tunnels in forwarding plane would be used widely in othre IETF > > technologies i would be less concerned. Right not it is not, and > > so i am worried to have an IPv6 encap profile in our draft that makes > > adoption most easy. > > > > > be. We can discuss out whether we should bput "SHOULD" with BIER prefix > > > (I'm kind of leery of v6 global addressing since that's not always given) > > > but then we need to talk how we deal with parallel links (or maybe we > > don't > > > have to given BIER only addresses whole BFR with a bit, I kind of didn't > > do > > > enough careful thinking here yet). > > > > > > > > > > > > > > > BIER is a switching fabric technology @ > > > > > L2.5 and not an overlay (and yes, it can be used that way but this > > is IMO > > > > > jsut as far from BIER as BESS is from idr ;-) > > > > > > > > See my other discuss point about the IMHO most 'useful' modes of > > > > deployment/forwarding. Those would be good to discuss in the drafts. > > > > > > > > Partial or full deployment of BIER with IPv6 encap: > > > > BIFR-to-BFER IPv6 encapsulated, per-BIER-hop rewrite of IPv6 header > > > > No differnce between partial or full deployment, > > > > should work automatically calculating remote next-hop in partial. > > > > > > > > > > There is somehow a huge misconception that as intermediate node you can > > > "rewrite headers and options on v6 while keeping the source address"in > > > flight > > > > Well, thats what SRH does. BIER also rewrites bitstring. > > rewriting IPv6 dest and optional source should in general > > be easier than actual decap+encap. Tell me if i am wrong. > > > > > and "adresses can encode my uncle's birthday" because "some people > > > said so now" > > > > Where where you when embedded RP was standardized so that you can throw > > stones ? ;-) > > > > My concern about SRH is that it is waste on midpoint SIDs not that > > abuse of IPv6 addresses is bad. > > > > I liked Pierre's bitstring in IPv6 addr, i just felt it was too short to > > be useful. > > > > I liked terrastreams QoS encoding in IPv6 addresses. > > > > If you want people to stop (ab)using IPv6 addresses, you need > > to give operators other header elements in which to carry policy. > > Flexible extensible not only by vendors. > > > > I tried to bring frameworks like this to IETF and was immediatly > > confronted by the IETF perpass/privacy lobby: Routers should not know > > anything. > > > > Ok, now i've run miles away from subject matter to my favourite soap box. > > > > > but the ultimately governing body are v6 working groups not > > > us. In fact, AFAIR v6 specs you can't, almost without exceptions (see the > > > raging discussions on SRv6 PHP, SRv6 basically breaking the "no v6 > > address > > > has semantics behind subnetting", mucking around with options they have > > no > > > business to muck with and so on).where v6 is acting as L2 basically and > > not > > > some end-2-end forwarding transport with semantics encoding. > > > > RFC8200 was written for uncontrolled internet paths, SRH/SRv6 was designed > > for > > controlled networks. Huge overhead as a result. If not for > > (predecessors) of RFC8200 would have from the beginning been something > > like CRH (which still has to argue representing IPv6 adddresses with > > mapping to suite RFC8200). > > > > RFC8200 is a plane to travel the planet. No, its not ideal to drive on > > highways, but nobody in the IETF wants to build a car. IPng process was > > 30 years ago, and we still think its results is sufficient for all > > futures. > > > > > If you start to shove BIER frames > > > around tunnels to show up in arbitrary places it's like shoving MPLS > > frames > > > to weird places and expect "labels to work". A BIER bitmask is basically > > a > > > very weird label with really only local significance on the link and not > > > using it correctly will make you expose BIER mask in places where they do > > > the wrong stuff (just like MPLS labels). > > > > I don't buy that argument. All VPNs are overlay networks (PE to PE), and > > operators know how to build them. Most L3 router networks are overlay > > networks on top of an optical switched underlay providing p2p colored > > connections, and those paths are often manually configured, similar to > > what i did 30 years ago with X.25 PVCs. All 3G/4G/5G "core" networks > > are overlays. Building overlays happens everywhere. Some are better, > > some are worth, often in the eye of the beholder. > > > > > Yes, bypassing non-supporting > > > nodes is ok if we control the semantics of that tightly but everything > > else > > > is basically brfeaking the architecture with a long tail fallout. BIER is > > > carefully thought out and reviewed and lots of stuff has security/OAM/etc > > > implications and that's what the WG is chartered to govern and not come > > up > > > with some "fashionable hacks" with the acronyms du jour. > > > > I think the best thing BIER can do is to promote the option of > > automatic mapping from a self-intelligent underlay, aka: the > > fully automatic IGP option described in rfc8297. > > > > I don't know how important partial upgrades/adoption of BIER within an > > IGP domain is, but i have seen a lot of asks for this for prior IP > > multicast technologies (especially in SPs), and it is so much easier now > > with BIER given how we are relying on autoconfiguration via IGP > > information. That makes it excitingly more attractive than the > > problematic solutions we tried to build earlier where we where not > > given the option to exten IGPs. > > > > > And yes, you can use BIER "in overlay" but that is not the current > > charter > > > of BIER WG as many other things are not. Or that would be a "BIER-BESS" > > > group I guess ... > > > > Ethernet is also a useless overlay for p2p links. Can we please > > only support HDLC headers ? SRv6 whether RH or CRH is always > > an overlay. > > > > If we come up with a solution that allows smooth incremental adoption > > of BIER in an IGP domain by using IPv6 encap as long as there are > > no full ethernet encap paths, and then automatically switch to ethernet > > encap paths unless there is a policy override ("operator loves IPv6 > > encap or reuse IPv6 FRR), i think we are on a good path for the first > > round document. > > > > The main issue i see is tht most multicst use is in VPNs, and i am > > not sure we have a good VPN solution without MPLS without some > > way to encapsulate destination SIDs like we have in MPLS. > > > > > And yes, "it's lame industry stuff" you're quoting, we have v6 standards > > > track documents signed of and 6man to govern all that stuff and arguments > > > along the lines "but my silicon doesn't do that" or "this implementation > > is > > > lousy" I'm sympathetic to but to quote Yakov here "I cannot prevent you > > > doing whatever you want to do in your privacy with the spec I'm > > publishing > > > but do not ask me to standardize your stuff if it does not follow the > > > governing architecture and needs interoperability". > > > > Its also bad to publish supposedly well-meaning architectures when > > you're not the one having to suffer on its issues. Should i bring on > > my rant about IPv6 scoped address architecture ? None of the folks who > > wrote that ever thought about IPv6 multicast. > > > > At best, architectures are good intentions. If they are assumed to be > > cast in stome they become dogmas. > > > > > And yes, please cross-post, I don't want 6man or spring to be led down > > some > > > garden path without being plugged in into the BIER working group where > > the > > > BIER technology is governed. > > > > Input from othre WGs is only that: Input. As i said, we do need to be > > worried about them claiming they can prohibit options we as BIER like > > to do - because of dogmas. > > > > Toerless > > > > > > --- tony > > > > -- > > --- > > tte@cs.fau.de > > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier -- --- tte@cs.fau.de From nobody Thu Mar 12 18:06:00 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 869203A0C46 for ; Thu, 12 Mar 2020 18:05:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.199 X-Spam-Level: X-Spam-Status: No, score=-4.199 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LDzp0s7eznvR for ; Thu, 12 Mar 2020 18:05:56 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BF7573A0C38 for ; Thu, 12 Mar 2020 18:05:55 -0700 (PDT) Received: from lhreml709-cah.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id B7AA75865E2101AFF650; Fri, 13 Mar 2020 01:05:51 +0000 (GMT) Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by lhreml709-cah.china.huawei.com (10.201.108.32) with Microsoft SMTP Server (TLS) id 14.3.408.0; Fri, 13 Mar 2020 01:05:50 +0000 Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by nkgeml705-chm.china.huawei.com (10.98.57.154) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Fri, 13 Mar 2020 09:05:48 +0800 Received: from nkgeml705-chm.china.huawei.com ([10.98.57.154]) by nkgeml705-chm.china.huawei.com ([10.98.57.154]) with mapi id 15.01.1713.004; Fri, 13 Mar 2020 09:05:48 +0800 From: "Xiejingrong (Jingrong)" To: Toerless Eckert , "bier@ietf.org" Thread-Topic: Answer 1-9 marked as [XJR1] to [XJR9] //RE: [Bier] comments for draft-xie-bier-ipv6-encapsulation-05.txt Thread-Index: AdX40s1etzkRZzgDSh+3DoatPELXWg== Date: Fri, 13 Mar 2020 01:05:48 +0000 Message-ID: <5e92d413479c4759bc4fe14cc6ab03fc@huawei.com> Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.202.118] Content-Type: multipart/alternative; boundary="_000_5e92d413479c4759bc4fe14cc6ab03fchuaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [Bier] Answer 1-9 marked as [XJR1] to [XJR9] //RE: comments for draft-xie-bier-ipv6-encapsulation-05.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Mar 2020 01:05:59 -0000 --_000_5e92d413479c4759bc4fe14cc6ab03fchuaweicom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Toerless, Please find below my answer 1-9 marked as [XJR1] to [XJR9] in blue text. Thanks Jingrong > 1. Introduction > 2. Terminology > 3. BIER IPv6 Encapsulation I think it would be good to write introductory text here explaining the overall approach of this encapsulation, e.g: BFIR running this option encapsulate the target IP multicast payload (IPv6, IPv6, ethernet packet) into a BIERv6 packet, which is an IPv6 packet with the new BIERv6 header. This packet is then hop-by-hop IPv6 forwarded with the BIER replication semantic defined by the BIERv6 header and decapsulated on the BFERs. [XJR1] I understand it as an editorial suggestion. Correct me if I am wrong > 3.1. BIER Option in IPv6 Destination Options Header > BSL: See Section 2.1.2 of RFC 8296. > Entropy: See Section 2.1.2 of RFC 8296. > OAM: See Section 2.1.2 of RFC 8296. > Rsv: See Section 2.1.2 of RFC 8296. Is there anything up to here that is different from what RFC8296 for non-MP= LS networks ? If there are new things here, they are hard to identify, so it might be better to eliminate all requirments that can be found in RFC8296 2.2 and only describe any changes. [XJR2] Editorial suggestion taken. > DSCP: SHOULD be set to binary value 000000 upon transmission and > MUST be ignored upon reception. In IPv6 BIER encapsulation, > uses highest 6-bit of Traffic Class field of IPv6 header to hold > a Differentiated Services Codepoint [RFC2474]. Given how this draft suggests to verbatim reuse the quite long RFC8296 forwarding header (like other proposals for BIER with IPv6 too), i think the hope is that it can leverage as much as possible existing BIER forwarding logic to ease adoption. It is therefore not clear to me if it is prudent to force the forwarding plane to use the DSCP from the IPv6 header instead of the BIER header. I would suggest to say that the BFIR us= es the same DSCP for both the IPv6 and BIER header so that forwarding plane can use either field, which ever is easier to impleemnt. Else, it would be good o have an explanation in the text why the above described approach is superior. [XJR3] I think I agree with most of the words here, while there are technic= al design considerations for DSCP/TC/TTL/Entropy for some important scenari= os. In RFC8296, TC/TTL is designed for BIER-MPLS, and when the BIER-MPLS over P= 2P-LSP is used for bypassing Non-BFR routers, the TC/TTL will works in pipe= -mode or uniform-mode. While in BIERv6 design, the TC/TTL in BIER-hdr and TC/HopLimit in IPv6-hdr = can both stand for its own purpose: the former is used for BIER-aware route= rs(BFRs), and the later is used for BIER-unaware routers(Non-BFRs)! It is also useful for diagnose by network administrator to know how many No= n-BFRs and BFRs in the path be checking the HopLimit in IPv6-Hdr and TTL in= BIER-Hdr on the BFER. So does Entropy in BIER-hdr and FlowLabel in IPv6-hdr: the FlowLabel can be= used for load-balance when forwarding a BIERv6 packet from A(BFR)----B(Non= BFR)=3D=3D=3D=3DC(BFR) where B can use, and BIER Entropy can be used by BFR= A. That shows an advantage of BIERv6 proposal than BIER-MPLS: BIER-MPLS over P= 2P-LSP may be difficult to support load-balance since the Non-BFR can't rea= d through a BIER header to get a hash value through inner IP header. This kind of advantage matches the design target of BIERv6 ---- for smooth = and ease of deployment in IPv6 network where Non-BFR is very common and lik= ely to be continuing for a very long time. > Use Next Header value 4, 41 and TBD0 for IPv4 packet, IPv6 > packet and Ethernet packet respectively, In general, this document might not constrain itself to specific code points but just allow all the code-points that users want and are defined by IANA. IPv4 and IPv6 of course can be explicitly listed maybe even with requirements levels. Rewrite text for TBD0 to instead say "code point for ethernet from ", so this doc wouldn't need to wait for it. [XJR4] This problem has been addressed in the rev-06. I suppose you started= this review quite a few days before I post the rev-06. Thanks for this tho= rough review! > and use Proto value > TBD1 indicating "Delivering the data packet with VRF lookup > in IPv6 source address". I am right now not on top of how BIER in MPLS networks supports the more co= mplex forms of VRFs, e.g.: extranet VRFs, but i thought it was through additional labels after the BIER header. Logically a BFIR might only have one address in VRF0, so it could be problematic to expect for BIER to assume per-VRF addresses as source addresses. [XJR5] I think you are right. Currently the BIER are using the "BIER Proto"= mechanism excessively in my mind. Allow me to explain the "excessively" he= re: (1) To support IPv4/IPv6/Ethernet multicast packet, BIER Proto=3D3/4/6 are = defined, but won't support VRF function. (2) To support VRF, the most common design (as used in RFC8556) is an upstr= eam-assigned VPN Label following the BIER header, and BIER Proto=3D2 is def= ined, but it heavily depend on the Context in the BIER header, and when the= BIER-MPLS PHP is proposed, it doesn't work. (3) Alternative of supporting VRF is using an domain-wide unique VPN Label = following the BIER header, and BIER Proto=3D1 is defined, but it does not s= upport RPF function (which is an essential function to MVPN), or it need an= other Per-Ingress domain-wide unique MPLS label, and change the RPF functio= n implementation to another way that is completely different than BIER Prot= o =3D 2. (4) There are also other proposals of BIER Proto value, for example, there = is proposal of BIER Proto=3D7/8/9 for VXLAN/NVGRE/GENEVE, which can be used= to support VRF function, while all these seems not likely to support RPF f= unction. (5) Totally there are 8 types of BIER Proto value, and 5 types of different= overlay headers (upstream-assigned MPLS Label, downstream-assigned MPLS la= bel stack, VXLAN, NVGRE, GENEVE), but none of them can fulfill a Whole func= tion that proposed so far ---- VRF, RPF, PHP. Not to mention that, each ty= pe of BIER Proto and each type of overlay header means chip effort to suppo= rt. Remember that each encoding of overlay header means a whole different h= andling, not only the VRF information, but every bits in an encoding need t= o be handled. Why is that ? I think a most useful design principle is lost in the Proto c= hain design ---- Optimizing for the most common or important case! What's the most common and import for multicast then ? ---- I think VRF and= RPF are two of them. To my best understanding, the design of "BIER Proto" brings much flexibilit= y surely, but excessively use of BIER Proto brings big interoperability cha= llenge. More likely to me, it is a thing that BIER itself lacks! However, built on the IPv6 internet-layer (L3), forwarding packet without c= hanging the IPv6 source address, BIERv6 can bring this benefit: (1) The global identifier of VRF, that is easy to get (enough bit width to = allocate, no new type identifier). (2) The global identifier of Ingress PE for MVPN RPF function. The design to use per-VRF address solves the above 2 essential functions in= a direct way. It uses only one BIER Proto (with 3 well-known Next Header value of course)= and none of extra encoding of overlay header. What problem do you see for a per-VRF address allocation ---- the waste of = IPv6 address ? Maybe it would be easier to move the VRF support into a separate document. [XJR6] See above. I haven't seen how to leave this essential design of BIER= v6, related to the combination use of IPv6 Next Header and BIER Proto value= , can be move to a separate document. Seems to me as if it would make sense to figure out if BIER with v6 could be combined with some subset of SRv6 that includes the destination (BFER) related SIDs, most of which seem to be about VRF selection. [XJR7] My understanding is that it will make the BFRs aware of VRF. Am I co= rrect ? That would make inclusion of BIER into SRv6 deployment easier. And i am guessing that customers who insist on hop-by-hop IPv6 forwarding across their core would likely minimize differences to SRv6 too. [XJR8] Using per-VRF IPv6 source addressing is completely different than SR= v6, just like the upstream-assigned VPN Label used in BIER-MVPN is complete= ly different than MPLS-VPN. We can have more discuss if you still have concern about the relationship o= f BIERv6 and SRv6, or we can move this discussion later together with some = other text. > Allocation of Next Header value TBD0 for Ethernet packet is > applying in [I-D.ietf-spring-srv6-network-programming] and > will not be listed in the IANA considerations section of this > document. With above change referring only to that doc, not he actual code-point, thi= s paragraph could go away. Of course, once the code point is IANA assigned,= you can simply use it in the text and remove the reference. [XJR9] Yes we have removed the reference already since the code point is al= ready IANA assigned (value 143). -----Original Message----- From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Toerless Eckert Sent: Thursday, March 12, 2020 12:24 PM To: bier@ietf.org Subject: [Bier] comments for draft-xie-bier-ipv6-encapsulation-05.txt Comments on subject document inline. Thanks a lot for the work. --_000_5e92d413479c4759bc4fe14cc6ab03fchuaweicom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Toerless,

 

Please find below my answer = 1-9 marked as [XJR1] to [XJR9] in blue text.

 

Thanks

Jingrong

 

 

> 1.  Introduction

> 2.  Terminology

> 3.  BIER IPv6 Encapsulation

 

I think it would be good to = write introductory text here explaining the

overall approach of this enc= apsulation, e.g: BFIR running this option

encapsulate the target IP mu= lticast payload (IPv6, IPv6, ethernet packet)

into a BIERv6 packet, which = is an IPv6 packet with the new BIERv6 header.

This packet is then hop-by-h= op IPv6 forwarded with the BIER replication

semantic defined by the BIER= v6 header and decapsulated on the BFERs.

[XJR1] = I understand it as an editorial suggestion. Correct me if I am wrong

 

> 3.1.  BIER Option in IPv6 Destination Options Header<= /span>

>    &= nbsp;    BSL: See Section 2.1.2 = of RFC 8296.

>    &= nbsp;    Entropy: See Section 2.= 1.2 of RFC 8296.

>    &= nbsp;    OAM: See Section 2.1.2 = of RFC 8296.

>    &= nbsp;    Rsv: See Section 2.1.2 = of RFC 8296.

 

Is there anything up to here= that is different from what RFC8296 for non-MPLS

networks ? If there are new = things here, they are hard to identify,

so it might be better to eli= minate all requirments that can be found in

RFC8296 2.2 and only describ= e any changes.

[XJR2] = Editorial suggestion taken.

&= nbsp;

>    &= nbsp;    DSCP: SHOULD be set to = binary value 000000 upon transmission and

>    &= nbsp;    MUST be ignored upon re= ception.  In IPv6 BIER encapsulation,

>    &= nbsp;    uses highest 6-bit of T= raffic Class field of IPv6 header to hold

>    &= nbsp;    a Differentiated Servic= es Codepoint [RFC2474].

 

Given how this draft suggest= s to verbatim reuse the quite long RFC8296

forwarding header (like othe= r proposals for BIER with IPv6 too), i think

the hope is that it can leve= rage as much as possible existing BIER

forwarding logic to ease ado= ption. It is therefore not clear to me if

it is prudent to force the f= orwarding plane to use the DSCP from the IPv6

header instead of the BIER h= eader. I would suggest to say that  the BFI= R uses

the same DSCP for both the I= Pv6 and BIER header so that forwarding plane

can use either field, which = ever is easier to impleemnt. Else, it would be

good o have an explanation i= n the text why the above described approach

is superior.

[XJR3] = I think I agree with most of the words here, while there are technical desi= gn considerations for DSCP/TC/TTL/Entropy for some important scenarios.

&n= bsp;

In RFC8= 296, TC/TTL is designed for BIER-MPLS, and when the BIER-MPLS over P2P-LSP = is used for bypassing Non-BFR routers, the TC/TTL will works in pipe-mode o= r uniform-mode.

While i= n BIERv6 design, the TC/TTL in BIER-hdr and TC/HopLimit in IPv6-hdr can bot= h stand for its own purpose: the former is used for BIER-aware routers(BFRs= ), and the later is used for BIER-unaware routers(Non-BFRs)!

It is a= lso useful for diagnose by network administrator to know how many Non-BFRs = and BFRs in the path be checking the HopLimit in IPv6-Hdr and TTL in BIER-H= dr on the BFER.

&n= bsp;

So does= Entropy in BIER-hdr and FlowLabel in IPv6-hdr: the FlowLabel can be used f= or load-balance when forwarding a BIERv6 packet from A(BFR)----B(NonBFR)=3D= =3D=3D=3DC(BFR) where B can use, and BIER Entropy can be used by BFR A.

That sh= ows an advantage of BIERv6 proposal than BIER-MPLS: BIER-MPLS over P2P-LSP = may be difficult to support load-balance since the Non-BFR can= 217;t read through a BIER header to get a hash value through inner IP header.

&n= bsp;

This ki= nd of advantage matches the design target of BIERv6 ---- for smooth and eas= e of deployment in IPv6 network where Non-BFR is very common and likely to = be continuing for a very long time.

&n= bsp;

>    &= nbsp;       Use N= ext Header value 4, 41 and TBD0 for IPv4 packet, IPv6

>    &= nbsp;       packe= t and Ethernet packet respectively,

 

In general, this document mi= ght not constrain itself to specific code

points but just allow all th= e code-points that users want and are

defined by IANA. IPv4 and IP= v6 of course can be explicitly listed

maybe even with requirements= levels.

 

Rewrite text for TBD0 to ins= tead say "code point for ethernet from <srv6 reference-doc>"= ;,

so this doc wouldn't need to= wait for it.

[XJR4] = This problem has been addressed in the rev-06. I suppose you started this r= eview quite a few days before I post the rev-06. Thanks for this thorough r= eview!

&n= bsp;

>    &= nbsp;       and u= se Proto value

>    &= nbsp;       TBD1 = indicating "Delivering the data packet with VRF lookup

>    &= nbsp;       in IP= v6 source address".

 

I am right now not on top of= how BIER in MPLS networks supports the more complex

forms of VRFs, e.g.: extrane= t VRFs, but i thought it was through additional

labels after the BIER header= . Logically a BFIR might only have one

address in VRF0, so it could= be problematic to expect for BIER to

assume per-VRF addresses as = source addresses.

&= nbsp;

[XJR5] = I think you are right. Currently the BIER are using the “BIER Prot= o” mechani= sm excessively in my mind. Allow me to explain the “excessively” here:

&n= bsp;

(1) To = support IPv4/IPv6/Ethernet multicast packet, BIER Proto=3D3/4/6 are defined= , but won't support VRF function.

(2) To = support VRF, the most common design (as used in RFC8556) is an upstream-ass= igned VPN Label following the BIER header, and BIER Proto=3D2 is defined, b= ut it heavily depend on the Context in the BIER header, and when the BIER-MPLS PHP is proposed, it doesn= 217;t work.

(3) Alt= ernative of supporting VRF is using an domain-wide unique VPN Label followi= ng the BIER header, and BIER Proto=3D1 is defined, but it does not support = RPF function (which is an essential function to MVPN), or it need another Per-Ingress domain-wide unique MPLS label, an= d change the RPF function implementation to another way that is completely = different than BIER Proto =3D 2.

(4) The= re are also other proposals of BIER Proto value, for example, there is prop= osal of BIER Proto=3D7/8/9 for VXLAN/NVGRE/GENEVE, which can be used to sup= port VRF function, while all these seems not likely to support RPF function.

(5) Tot= ally there are 8 types of BIER Proto value, and 5 types of different overla= y headers (upstream-assigned MPLS Label, downstream-assigned MPLS label sta= ck, VXLAN, NVGRE, GENEVE), but none of them can fulfill a Whole function that proposed so far ---- VRF, RPF, PHP.=  Not to mention th= at, each type of BIER Proto and each type of overlay header means chip effo= rt to support. Remember that each encoding of overlay header means a whole different handling, not only the VRF information, but every = bits in an encoding need to be handled.

&n= bsp;

Why is = that ? I think a most useful design principle is lost in the Proto chain de= sign ---- Optimizing for the most common or important case!

What’s the most c= ommon and import for multicast then ? ---- I think VRF and RPF are two of them.

&n= bsp;

To my b= est understanding, the design of “BIER Prot= o” brings = much flexibility surely, but excessively use of BIER Proto brings big interoper= ability challenge. More likely to me, it is a thing that BIER itself lacks!=

&n= bsp;

However= , built on the IPv6 internet-layer (L3), forwarding packet without changing the IPv6 source address, BIERv6 can bring this benefit:<= /p>

(1) The= global identifier of VRF, that is easy to get (enough bit width to allocat= e, no new type identifier).

(2) The= global identifier of Ingress PE for MVPN RPF function.

The des= ign to use per-VRF address solves the above 2 essential functions in a dire= ct way.

It uses= only one BIER Proto (with 3 well-known Next Header value of course) and no= ne of extra encoding of overlay header.

&n= bsp;

What pr= oblem do you see for a per-VRF address allocation ---- the waste of IPv6 ad= dress ?

&= nbsp;

&= nbsp;

Maybe it would be easier to = move the VRF support into a separate document.

[XJR6] = See above. I haven’t seen how to leave this essential design of BIERv6, related to the combination use of IPv6 Next Header and BIER Proto value, c= an be move to a separate document.

&n= bsp;

Seems to me as if it would m= ake sense to figure out if BIER with v6

could be combined with some = subset of SRv6 that includes the destination

(BFER) related SIDs, most of= which seem to be about VRF selection.

[XJR7] = My understanding is that it will make the BFRs aware of VRF. Am I correct ?=

&= nbsp;

That would make inclusion of= BIER into SRv6 deployment easier. And

i am guessing that customers= who insist on hop-by-hop IPv6 forwarding

across their core would like= ly minimize differences to SRv6 too.

[XJR8] = Using per-VRF IPv6 source addressing is completely different than SRv6, jus= t like the upstream-assigned VPN Label used in BIER-MVPN is completely diff= erent than MPLS-VPN.

We can = have more discuss if you still have concern about the relationship of BIERv= 6 and SRv6, or we can move this discussion later together with some other t= ext.

 

>    &= nbsp;       Alloc= ation of Next Header value TBD0 for Ethernet packet is

>    &= nbsp;       apply= ing in [I-D.ietf-spring-srv6-network-programming] and

>    &= nbsp;       will = not be listed in the IANA considerations section of this<= /p>

>    &= nbsp;       docum= ent.

 

With above change referring = only to that doc, not he actual code-point, this paragraph could go away. O= f course, once the code point is IANA assigned, you can simply use it in th= e text and remove the reference.

[XJR9] = Yes we have removed the reference already since the code point is already I= ANA assigned (value 143).

 

 

-----Original Message----- From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Toerless Eckert
Sent: Thursday, March 12, 2020 12:24 PM
To: bier@ietf.org
Subject: [Bier] comments for draft-xie-bier-ipv6-encapsulation-05.txt

 

Comments on subject document= inline. Thanks a lot for the work.

&= nbsp;

--_000_5e92d413479c4759bc4fe14cc6ab03fchuaweicom_-- From nobody Thu Mar 12 19:00:59 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E6A203A0D6C; Thu, 12 Mar 2020 19:00:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.871 X-Spam-Level: X-Spam-Status: No, score=-0.871 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Dxj5E7DYLjmz; Thu, 12 Mar 2020 19:00:49 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9255A3A0D68; Thu, 12 Mar 2020 19:00:49 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [131.188.34.52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 2EC8C54842E; Fri, 13 Mar 2020 03:00:43 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id 26CF7440040; Fri, 13 Mar 2020 03:00:43 +0100 (CET) Date: Fri, 13 Mar 2020 03:00:43 +0100 From: Toerless Eckert To: Tony Przygienda Cc: Erik Kline , 6MAN <6man@ietf.org>, v6ops list , BIER WG , Mark Smith Message-ID: <20200313020043.GA59538@faui48f.informatik.uni-erlangen.de> References: <20200312000016.GO54522@faui48f.informatik.uni-erlangen.de> <20200312213601.GB34894@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] [v6ops] IPv6 link-local traffic questions X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Mar 2020 02:00:53 -0000 Tony: On Thu, Mar 12, 2020 at 05:05:01PM -0700, Tony Przygienda wrote: > interesting exchange and Erik's last observation (ttl=1 and LL for > multicast) puts it on the point, we are talking here a suggestion for BIER > control plane where the contained packet is multicast. I would hate to see > a multicast packet due to TTL > 1 end up in funky place and replicated > there. I was actually talking about the "TTL=1" (*) requirement in section 2 of draft-zhang-bier-bierin6, and that is an IPv6 unicast data plane packet, not a multicast packet. It just carries a mlticast packet. Which packet where you talking about ? But your point about possible undesirable replication if TTL>1 for link-local multicast packets is interesting. I had actually not thought about that, and can not remember an example. Do you have one ? RFC5082 for once does not mention the words multicast or unicast, si it's anybody's guess how it feels its recommendation should be applied (usually mentioning nothing means unicast only, so in that sense it could be argued to not be intended to apply to multicast). > Another interesting question is what if the LL source and destination are > the same and TTL>1 but AFAIK that cannot happen since LL is generated using > EUI-64 (albeit to my surprise I saw enough customers running same LL > address on all links of a device & this is valid :-/ Probably not an issue for the v6 encap layer, but the multicast layer: RPF failure, or bit-reset in BIER for multicast payloads. > That aside, as I mentioned to Toerless that LL with TTL=1 is usual stuff > since long time, we are talking here either something like BFD router to > router Yes, has been forever for IPv4 multicast link-local and all the IPv6 link-local i know (e.g.: OSPF). But i just learned from this thread that IPv6 Neighbor Discovery multicast packets use 255 (predating RFC5082). I was also interested i there are any rules which HC to use, but seemingly it is a free choice of the application, so we (BIER in IPv6) can decide as we please, we just may need to beat up the 1 vs 255 argument from their technical proc/cons. > or now in case of BIER it's suggested to be used as "implicit one > hop tunnel" basically carrying BIER frame router-to-router instead of ether > encaps (since BIER is L2.5, strictly speaking "abusing" v6 as transport is > bit rich but it satisfies things like HOMENET which need mutlicast very > nicely where the silicon doesn't need to process BIER but processes naive > v6 easily, after v6 decaps it can go to slow path since HOMENET doesn't > need any serious mcast throughtput [but nothing special AFAIS if the > silicon chooses to process it after the decaps when demand arises or when > used e.g. in core]) May sales pitch would be : Putting something new over L2 can be harder for wide-ranging adoption, and you need to start thinking about possible L2 differences. Being able tto run it over link-local IPv6 is a nice way to avoid those issues. I dor for example also have a draft in ANIMA doing exactly the same thing (not for multicast). Thanks Toerless > > thanks > > --- tony > (*) standard disclaimer: Yes, i do complain to authors using IPv4 terms for equivalent IPv6 functions, but i complain even more to IPv6 for the gratuitous renaming of perfect names in IPv6. From nobody Fri Mar 13 00:57:57 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3F8493A1319 for ; Fri, 13 Mar 2020 00:57:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id A-HCjCWs7j1B for ; Fri, 13 Mar 2020 00:57:52 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 03F683A131C for ; Fri, 13 Mar 2020 00:57:52 -0700 (PDT) Received: from LHREML713-CAH.china.huawei.com (unknown [172.18.7.106]) by Forcepoint Email with ESMTP id C26E7CD83DB3055C8F54; Fri, 13 Mar 2020 07:57:47 +0000 (GMT) Received: from nkgeml704-chm.china.huawei.com (10.98.57.158) by LHREML713-CAH.china.huawei.com (10.201.108.36) with Microsoft SMTP Server (TLS) id 14.3.408.0; Fri, 13 Mar 2020 07:57:37 +0000 Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by nkgeml704-chm.china.huawei.com (10.98.57.158) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Fri, 13 Mar 2020 15:57:34 +0800 Received: from nkgeml705-chm.china.huawei.com ([10.98.57.154]) by nkgeml705-chm.china.huawei.com ([10.98.57.154]) with mapi id 15.01.1713.004; Fri, 13 Mar 2020 15:57:34 +0800 From: "Xiejingrong (Jingrong)" To: Toerless Eckert , "bier@ietf.org" Thread-Topic: Answer 10-19 marked as [XJR10] to [XJR19] //RE: [Bier] comments for draft-xie-bier-ipv6-encapsulation-05.txt Thread-Index: AdX5DAfANt5NPQibRZiB4wReHf9cgw== Date: Fri, 13 Mar 2020 07:57:34 +0000 Message-ID: Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.202.118] Content-Type: multipart/alternative; boundary="_000_b1b55ac314c04dae84949dacad9a4443huaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [Bier] Answer 10-19 marked as [XJR10] to [XJR19] //RE: comments for draft-xie-bier-ipv6-encapsulation-05.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Mar 2020 07:57:55 -0000 --_000_b1b55ac314c04dae84949dacad9a4443huaweicom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Toerless, Please find below my answer 10-19 marked as [XJR10] to [XJR19] in blue text= . Thanks Jingrong > 3.2. Multicast and Unicast Destination Address > BIER is generally a hop-by-hop and one-to-many architecture, and thus > the IPv6 Destination Address (DA) being a Multicast Address is a way > one may think of as an approach for both the two paradigms in BIERv6 > encapsulation. I think a better way to explain: If an IPv6 (or IPv4) multicast group destination address is used as a hop-by-hop forwarding key, then this requires hop-by-hop per-group forwardi= ng state, therefore, just because BIER is like IP multicast a (multi-)point-to-multip= oint service, it can not use IP multicast IP multicast group destination addresses. Inste= ad it requires per-hop unicast destination address forwarding. [XJR10] I am not sure about the said "per-group forwarding state" above. The early revision of this draft proposed to use one-group (for example, FF= 05::AB37) for all BIER packets. A packet is like this: {IPv6 Hdr(SA=3DBFIR, DA=3Dff05::ab37), Dest-Option-H= eader(BIER), C-mcast-pkt(IPv4/IPv6/Ethernet)}. There is only one MFIB entry added in every BFR: (*, ff05::ab37), and the e= ntry is to tell the data-plane to do a further lookup of Dest-Option-Header= (BIER) ! The forwarding plane receives a packet, classifier it as an IPv6 multicast = packet, lookup MFIB entry, and assume some BIER specific action ----similar= as using End.BIER unicast address ---- and then lookup the assumed BIER he= ader in the extension header. Please let me know if this explanation is clear to you. > However using a unicast address has the following benefits: > 1. Tunneling a BIERv6 packet over a non-BIER capable router. > 2. Fast rerouting a BIERv6 packet using a unicast by-pass tunnel. Maybe more general "Using unicast FRR adjacencies to next-hop BFR". [XJR11] Editorial suggestion noted. > 3. Forwarding a BIERv6 packet to one of the many BFR neighbors > connected on a LAN. Well. AFAIK, all the BIER solutions as well as mLDP/RSVP-TE have rather the= downside that they must create multiple copies across the same LAN as they= have neighbors to send to, so this is not only a benefit. (Maybe mLDP does= now standardize native link-local multicast with upstream assigned labels = to leverage L2 multicast, not sure). [XJR12] My understanding is that, BIER-MPLS and BIER-ETH will both use unic= ast destination address and will not create multiple copies across the same= LAN. > 4. Connecting BIER domains, for example Data Center domains, in an > overlay manner. Given the management considerations for the BIER addressing space, this is a bit like saying the telephone allows people in different countries to talk with each other. Aka: Higher layer problems non-withstanding. [XJR13] the said "Data center domains" is managed by a single operator. The Peering multicast case in may be he= lpful to understand this. Need a reference to that case and that draft here ? IMHO, no need to create contention around point 3 and 4, its just a reqiure= ments and it comes with undeniable benefits 1. and 2. [XJR14] Given the above explanation, I think point 3 and point 4 are really= different thing IMO (see above also). Your thoughts ? > Some of the above functions are assumed very basic requirements and > part of BIER architecture as described in [RFC8279]. This document > uses unicast address for both one-hop replication and multi-hop > replication. Not sure if one-hop replication and multi-hop replication are well predefin= ed terms maybe better "BIER replication to subnet adjacent BFR and BIER replication = to remote BFR". [XJR15] Editorial suggestion noted. > The unicast address used in BIERv6 packet targeting a BFR SHOULD be > advertised as part of the BIER IPv6 Encapsulation. When a BFR > advertises the BIER information with BIERv6 encapsulation capability, > an IPv6 unicast address of this BFR MUST be selected specifically for > BIERv6 packet forwarding. Locally this "BIER Specific" IPv6 address > is initialized in FIB with a flag of "BIER specific handling", > represented as End.BIER function. You should start explaining here, before you use the SR terminology (foo.ba= r), that the semantic of the encapsulation addresses is explained in SR termino= logy becuase it is desired for BIERv6 to be used inside an SRv6 network and share its terminology. Right now you do it after using all the SR terminolo= gy and pseudo code, which may ten confuse non-SRv6 aware readers. [XJR16] Except the wording and terminology above, do you think it a heavy d= ependency of BIERv6 on any SRv6 ? In my understanding, the SRv6 (at least used here in the document) is only = a thin layer over IPv6, which includes only the paradigm of "initializing a= n FIB entry for a 128-bit IPv6 address" to guide the data-plane process. Would you like to propose some text here ? > The following is an example pseudo-code of the End.BIER function: > > 1. IF NH =3D 60 and HopLimit > 0 ;;Ref= 1 > 2. IF (OptType1 =3D BIER) and (OptLength1 =3D HdrExtLen*8 + 4) ;;R= ef2 > 3. Lookup the BIER Header inside the BIER option TLV. > 4. Forward via the matched entry. > 5. ELSE ;;Ref3 > 6. Drop the packet and end the process. > 7. ELSE IF NH=3DICMPv6 or (NH=3D60 and Dest_NH=3DICMPv6) ;= ;Ref4 > 8. Send to CPU. > 9. ELSE ;;Ref5 > 10. Drop the packet. I didn't try yet to understand all this text, and so might other non-SR kno= wledgable readers, so i recommend to add a summary at the end that tries to explain n= on-SR terms what specifically this example was doing. [XJR17] Thanks for the comment. We will try, and highly appreciate if you o= r anyone could provide some text. Thanks in advance! > 3.3. BIERv6 Packet Format > > examples in other RFCs. [RFC6275] introduces how the order should be > when other extension headers carries along with Home address option > in a destination options header. Similar to this example, this > document requires the Destination Options Header carrying the BIER > option MUST be placed as follows: > o After the routing header, if that header is present > o Before the Fragment Header, if that header is present > o Before the AH Header or ESP Header, if either one of those headers > is present > Source Address field in the IPv6 header MUST be a routable IPv6 > unicast address of the BFIR in any case. Is it permitted by RFC8200 to lie about the source address when you are a node operating on a destination option ? I don't know because i am not an ordained priest of the church of RFC8200. I understand you are allowed to keep the source address unchanged (and declare that not to be a lie) when you rewrite the destination address as part of being addressed by a routing header option, but i thought even in SRv6 when you do something like a binding-SID you would have to rewrite the source address. [XJR18] You understanding is correct - the draft proposes to keep the sourc= e address unchanged and rewrite the destination address as well as the DOH = option data (BitString/TTL/etc) according to the DOH instead of a routing h= eader, when the DA of packet is the node's IPv6 address. We've thought and checked this carefully and found no harm for anything, an= d found no confliction with current IPv6 spec 8200 or so on. We assume it is a situation that is beyond of the foresight of RFC8200 whic= h is actually designed 25 years ago. Just in case we are encountering a completely new requirements and situatio= ns ---- (1) The problem that traditional IP-multicast packet with multicast address= are facing is highly recognized, and BIER is the latest and focusing inter= est. (2) Use of multicast address as BIERv6 destination address had already cons= idered and given up for reasons explained in section 3.2 of this document p= er the discussions in BIER discussions. (3) Many network operators are moving to Native IPv6 for their new services= or future architecture, with things of incremental-deployment, ease of mai= ntaining as their outstanding concerns. I think if the BIER WG accept such requirements and the situations, we can = have more discussions focusing on the tech aspects ---- the benefit, the co= st, the impact to IPv6, the alternatives, rather than individual's feelings= that is pending. Make sense ? > BFIR encodes the Non-MPLS BIER header in the above mentioned > encapsulation format and forwards the BIERv6 packet to the nexthop > BFR following the local BIFT table. LCD Display ;-) (Table is the last word in BIFT, no need to replicate). [XJR19] Editorial suggestion noted. -----Original Message----- From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Toerless Eckert Sent: Thursday, March 12, 2020 12:24 PM To: bier@ietf.org Subject: [Bier] comments for draft-xie-bier-ipv6-encapsulation-05.txt Comments on subject document inline. Thanks a lot for the work. --_000_b1b55ac314c04dae84949dacad9a4443huaweicom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Toerless,

 

Please find below my answer = 10-19 marked as [XJR10] to [XJR19] in blue text.

 

Thanks

Jingrong

 

 

> 3.2.  Multicast and Unicast Destination Address

>   = BIER is generally a hop-by-hop and one-to-many archit= ecture, and thus

>   = the IPv6 Destination Address (DA) being a Multicast A= ddress is a way

>   = one may think of as an approach for both the two para= digms in BIERv6

>   = encapsulation.

 

I think a better way to expl= ain:

If an IPv6 (or IPv4) multica= st group destination address is used as a

hop-by-hop forwarding key, t= hen this requires hop-by-hop per-group forwarding state,<= /p>

therefore, just because BIER= is like IP multicast a (multi-)point-to-multipoint service,

it can not use IP multicast = IP multicast group destination addresses. Instead

it requires per-hop unicast = destination address forwarding.

[XJR10]= I am not sure about the said “per-group= forwarding state” above.

The ear= ly revision of this draft proposed to use one-group (for example, FF05::AB3= 7) for all BIER packets.

A packe= t is like this: {IPv6 Hdr(SA=3DBFIR, DA=3Dff05::ab37), Dest-Option-Header(B= IER), C-mcast-pkt(IPv4/IPv6/Ethernet)}.

There i= s only one MFIB entry added in every BFR: (*, ff05::ab37), and the entry is= to tell the data-plane to do a further lookup of Dest-Option-Header(BIER) = !

The for= warding plane receives a packet, classifier it as an IPv6 multicast packet,= lookup MFIB entry, and assume some BIER specific action ----similar as usi= ng End.BIER unicast address ---- and then lookup the assumed BIER header in the extension header.<= /p>

Please = let me know if this explanation is clear to you.

 

&= nbsp;

>   = However using a unicast address has the following ben= efits:

>   = 1.  Tunneling a BIERv= 6 packet over a non-BIER capable router.

>   = 2.  Fast rerouting a = BIERv6 packet using a unicast by-pass tunnel.

Maybe more general "Usi= ng unicast FRR adjacencies to next-hop BFR".

[XJR11]= Editorial suggestion noted.<= /p>

&= nbsp;

>   = 3.  Forwarding a BIER= v6 packet to one of the many BFR neighbors

>    &= nbsp;   connected on a LAN.

 

Well. AFAIK, all the BIER so= lutions as well as mLDP/RSVP-TE have rather the downside that they must cre= ate multiple copies across the same LAN as they have neighbors to send to, = so this is not only a benefit. (Maybe mLDP does now standardize native link-local multicast with upstream assign= ed labels to leverage L2 multicast, not sure).

[XJR12]= My understanding is that, BIER-MPLS and BIER-ETH will both use unicast des= tination address and will not create multiple copies across the same LAN.

&= nbsp;

>   = 4.  Connecting BIER d= omains, for example Data Center domains, in an

>    &= nbsp;   overlay manner.

 

Given the management conside= rations for the BIER addressing space, this is

a bit like saying the teleph= one allows people in different countries to

talk with each other. Aka: H= igher layer problems non-withstanding.

[XJR13]= the said “Data center doma= ins” is ma= naged by a single operator.

The Pee= ring multicast case in <draft-geng-bier-ipv6-inter-domain> may be hel= pful to understand this.

Need a = reference to that case and that draft here ?

&= nbsp;

IMHO, no need to create cont= ention around point 3 and 4, its just a reqiurements

and it comes with undeniable= benefits 1. and 2.

[XJR14]= Given the above explanation, I think point 3 and point 4 are really differ= ent thing IMO (see above also). Your thoughts ?=

&= nbsp;

>   = Some of the above functions are assumed very basic re= quirements and

>   = part of BIER architecture as described in [RFC8279].<= /span>&n= bsp; This document

>   = uses unicast address for both one-hop replication and= multi-hop

>   = replication.

 

Not sure if one-hop replicat= ion and multi-hop replication are well predefined terms

maybe better "BIER repl= ication to subnet adjacent BFR and BIER replication to remote BFR".

[XJR15]= Editorial suggestion noted.

&= nbsp;

 

>   = The unicast address used in BIERv6 packet targeting a= BFR SHOULD be

>   = advertised as part of the BIER IPv6 Encapsulation.&nbs= p; When a BFR

>   = advertises the BIER information with BIERv6 encapsula= tion capability,

>   = an IPv6 unicast address of this BFR MUST be selected = specifically for

>   = BIERv6 packet forwarding.  Locally this "BIER Specific" IPv6 address

>   = is initialized in FIB with a flag of "BIER speci= fic handling",

>   = represented as End.BIER function.

 

You should start explaining = here, before you use the SR terminology (foo.bar),

that the semantic of the enc= apsulation addresses is explained in SR terminology

becuase it is desired for BI= ERv6 to be used inside an SRv6 network and

share its terminology. Right= now you do it after using all the SR terminology

and pseudo code, which may t= en confuse non-SRv6 aware readers.

[XJR16]= Except the wording and terminology above, do you think it a heavy dependen= cy of BIERv6 on any SRv6 ?

In my u= nderstanding, the SRv6 (at least used here in the document) is only a thin = layer over IPv6, which includes only the paradigm of “initializ= ing an FIB entry for a 128-bit IPv6 address” to guide the data-plane process.

Would y= ou like to propose some text here ?

&= nbsp;

>   = The following is an example pseudo-code of the End.BI= ER function:

>

>    &= nbsp; 1. IF NH =3D 60 and HopLimit > 0 &= nbsp;           &nbs= p;            &= nbsp;    ;;Ref1

>    &= nbsp; 2.  = IF (OptType1 =3D BIER) and (OptLength1 =3D HdrExtLen*8 + 4) ;;Ref2

>    &= nbsp; 3.     Lookup the BIER Header inside the BIER option TLV.

>    &= nbsp; 4.     Forward via the matched entry.

>    &= nbsp; 5.  = ELSE            = ;            &n= bsp;            = ;            &n= bsp;  ;;Ref3

>    &= nbsp; 6.     Drop the packet and end the process.

>    &= nbsp; 7. ELSE IF NH=3DICMPv6 or (NH=3D60 and De= st_NH=3DICMPv6)          <= /span> ;;Ref4

>    &= nbsp; 8.  = Send to CPU.

>    &= nbsp; 9. ELSE     &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;          ;;Ref5

>    <= /span> 10.   Drop= the packet.

 

I didn't try yet to understa= nd all this text, and so might other non-SR knowledgable<= /p>

readers, so i recommend to a= dd a summary at the end that tries to explain non-SR

terms what specifically this= example was doing.

[XJR17]= Thanks for the comment. We will try, and highly appreciate if you or anyon= e could provide some text. Thanks in advance!

 

> 3.3.  BIERv6 Packet Format

>

>   = examples in other RFCs.  [RFC6275] introduces how the order should be

>   = when other extension headers carries along with Home = address option

>   = in a destination options header.  Similar to this example, this

>   = document requires the Destination Options Header carr= ying the BIER

>   = option MUST be placed as follows:

>   = o  After the routing = header, if that header is present

>   = o  Before the Fragmen= t Header, if that header is present

>   = o  Before the AH Head= er or ESP Header, if either one of those headers

>    &= nbsp;  is present

>   = Source Address field in the IPv6 header MUST be a rou= table IPv6

>   = unicast address of the BFIR in any case.

 

Is it permitted by RFC8200 t= o lie about the source address when you

are a node operating on a de= stination option ? I don't know because

i am not an ordained priest = of the church of RFC8200. I understand

you are allowed to keep the = source address unchanged (and declare that

not to be a lie) when you re= write the destination address as part of

being addressed by a routing= header option, but i thought even in SRv6

when you do something like a= binding-SID you would have to rewrite the

source address. <= /span>

 

[XJR18]= You understanding is correct – the draf= t proposes to keep the source address unchanged and rewrite the destination= address as well as the DOH option data (BitString/TTL/etc) according to the DOH instead of a routing header, when the DA of packet is= the node’= s IPv6 address.

We’ve thought and= checked this carefully and found no harm for anything, and found no confliction with current IPv6 spec 8200 or so on.

&n= bsp;

We assu= me it is a situation that is beyond of the foresight of RFC8200 which is ac= tually designed 25 years ago.

Just in= case we are encountering a completely new requirements and situations ----=

(1) The= problem that traditional IP-multicast packet with multicast address are fa= cing is highly recognized, and BIER is the latest and focusing interest.

(2) Use= of multicast address as BIERv6 destination address had already considered = and given up for reasons explained in section 3.2 of this document per the = discussions in BIER discussions.

(3) Man= y network operators are moving to Native IPv6 for their new services or fut= ure architecture, with things of incremental-deployment, ease of maintainin= g as their outstanding concerns.

&n= bsp;

I think= if the BIER WG accept such requirements and the situations, we can have mo= re discussions focusing on the tech aspects ---- the benefit, the cost, the= impact to IPv6, the alternatives, rather than individual’s feelings that is pending.

Make se= nse ?

&= nbsp;

>   = BFIR encodes the Non-MPLS BIER header in the above me= ntioned

>   = encapsulation format and forwards the BIERv6 packet t= o the nexthop

>   = BFR following the local BIFT table.=

 

LCD Display ;-)

(Table is the last word in B= IFT, no need to replicate).

[XJR19]= Editorial suggestion noted.

 

 

-----Original Message----- From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Toerless Eckert
Sent: Thursday, March 12, 2020 12:24 PM
To: bier@ietf.org
Subject: [Bier] comments for draft-xie-bier-ipv6-encapsulation-05.txt

 

Comments on subject document= inline. Thanks a lot for the work.

 

--_000_b1b55ac314c04dae84949dacad9a4443huaweicom_-- From nobody Fri Mar 13 01:37:44 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7A9F03A13B4 for ; Fri, 13 Mar 2020 01:37:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AV9ToQqScGJd for ; Fri, 13 Mar 2020 01:37:40 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D1B303A13B5 for ; Fri, 13 Mar 2020 01:37:39 -0700 (PDT) Received: from LHREML711-CAH.china.huawei.com (unknown [172.18.7.106]) by Forcepoint Email with ESMTP id 616257AE2CDA721A9367; Fri, 13 Mar 2020 08:37:37 +0000 (GMT) Received: from nkgeml707-chm.china.huawei.com (10.98.57.157) by LHREML711-CAH.china.huawei.com (10.201.108.34) with Microsoft SMTP Server (TLS) id 14.3.408.0; Fri, 13 Mar 2020 08:37:36 +0000 Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by nkgeml707-chm.china.huawei.com (10.98.57.157) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Fri, 13 Mar 2020 16:37:34 +0800 Received: from nkgeml705-chm.china.huawei.com ([10.98.57.154]) by nkgeml705-chm.china.huawei.com ([10.98.57.154]) with mapi id 15.01.1713.004; Fri, 13 Mar 2020 16:37:34 +0800 From: "Xiejingrong (Jingrong)" To: Toerless Eckert , "bier@ietf.org" Thread-Topic: Answer 20 to 30 marked as [XJR20] to [XJR30] //RE: [Bier] comments for draft-xie-bier-ipv6-encapsulation-05.txt Thread-Index: AdX5EgkZJybUMCv6SDuSYlmMV+EwSw== Date: Fri, 13 Mar 2020 08:37:34 +0000 Message-ID: Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.202.118] Content-Type: multipart/alternative; boundary="_000_d4c4d4a308d847fbb8952aeb49baff11huaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [Bier] Answer 20 to 30 marked as [XJR20] to [XJR30] //RE: comments for draft-xie-bier-ipv6-encapsulation-05.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Mar 2020 08:37:43 -0000 --_000_d4c4d4a308d847fbb8952aeb49baff11huaweicom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Toerless, Please find below my answer 20-30 (for section 4 of this draft) marked as [= XJR20] to [XJR30] in blue text. Thanks Jingrong > 4. BIERv6 Packet Processing > There is no BIER-specific processing, ? Unclear. [XJR20] Editorial suggestion noted. Please allow me find some better text h= ere. > and all the 8 steps in section > 6.5 of RFC8279 apply to BIERv6 packet processing. However, there are > some IPv6-specific processing procedures due to the base and general > procedures of IPv6. > > On the overlay layer, when a multicast packet enters the BIER domain > in a Non-MPLS IPv6 network, the Ingress BFR (BFIR) encapsulates the > multicast packet with a BIERv6 Header, transforming it to a BIERv6 Encapsulates instead of transform IMHO. [XJR21] Editorial suggestion noted. > packet. The BIERv6 header includes an IPv6 header and IPv6 > Destination Options Header within a standard Non-MPLS BIER header. > Source Address field in the IPv6 header MUST be set to a routable > IPv6 unicast address of the BFIR. Destination Address field in the > IPv6 header is set to the End.BIER address of the next-hop BFR the > BIERv6 packet replicating to, no matter next-hop BFR is directly > connected (one-hop) or not directly connected (multi-hop). I think it would be good to provide in a fitting place some good justification/examples why especially BFR not acting as BFER would benefit from using any other addresses than the BIER prefix of the BFR. [XJR22] Combining the BFR-prefix with the End.BIER address is the previous = (before rev-04) proposal of this draft. We change this for some reasons: (1) Plan and allocate End.BIER of "all nodes" of a network from a block, so= the ACL can be easily deployed on each node, as explained in chapter 5. (2) Decouple the two for better management: network administrator may be us= ed to configure a BFR-prefix from the loopback address that is used for BGP= peer/Tunnel Endpoint, while End.BIER block is a different thing need care = for secure deployment. > It is a local behavior to handle the combination of extension > headers, options and the BIER option(s) in destination options header > when a 'BIER Specific Handling' indication is got by the preceding > FIB lookup. Early deployment of BIERv6 may require there is only one > BIER option TLV in the destination options header followed the IPv6 > header. How other extension headers or more BIER option TLVs in a > BIERv6 packet is handled is outside the scope of this document. Typically AFAIK, the handling of option headers is not tied to a avarying semantic of the destination address. I do understand that IPv6 SIDs have semantic tied to them, but is there an example how such a semantic would impact the handling of a particular destination option ? If there is, then it would be good to cite such an SRv6 function as another example of the desired behavior in this draft. [XJR23] I agree with you that IPv6 option headers is not tied to a special = destination address in IPv6 spec. But that does not fit the "forwarding-plane-realities" for the past 25 year= s(see below pdf you co-authoring). https://datatracker.ietf.org/meeting/104/materials/slides-104-wgtlgo-forwar= ding-plane-realities "Processing that spans multiple headers increases complexity and eliminates= opportunities for optimizations" "don't assume complete processing flexibility." I think the above text are saying the IPv6-spec next-header chain and optio= n TLV chain that "not tied" to a specific destination address. And that's why the preceding indication of "IPv6 DA" lookup is useful. Once the "IPv6 DA" lookup of specific destination address determine that it= is a special address (BIER-only address), then only the least thing is nec= essary, and "unexpected conditions" are all shortcut handled (see below XJR= 26 and XJR27). I for once think that the idea of being able to modify the semantic of option headers based on the address is potentially useful (would need to figure out better examples), but: [XJR24] I agree. Why not exploring ;-) If there is a relevant customer community for BIERv6 that is not interested in SRv6, it would be better if the base functionality would not rely on SRv6 specific concepts, but if these SRv6/SID related options would be part of a specific section in this document like "BIERv6 with SIDs" or so. That way bot the IPv6, no SRv6 and IPv6+SRv6 customers would easier be made happy. [XJR25] I don't see how the "SRv6 specific concepts" affect the independenc= y of BIERv6. As stated before, SRv6 concept is only a thin layer over IPv6 to me. It's all about forwarding-plane realities in my understanding! Your thoughts? > A packet having a 'BIER Specific Handling' indication but not having > a BIER option is supposed to be a wrong packet or an ICMPv6 packet, Explain the "ICMPv6 packet" ? [XJR26] This is an exception-handling case. The "special handling indicatio= n" is got but the unexpected condition is encountered. A packet having a 'BIER specific handling' but doesn't get the expected thi= ng, then the 'exception handling' is triggered. The above is such "exception handling", which can be discarding a packet, o= r checking further if it is ICMPv6 packet. > A packet not having a 'BIER Specific Handling' indication but having > a BIER option SHOULD be processed normally as unicast forwarding > procedures, which may be a behavior of drop, or send to CPU, or other > behaviors in existing implementations. SHOULD be processed normally as unicast forwarding procedures AFTER BIER replication ? E.g.: not quite sure which case yo're referring to here. [XJR27] This is an exception-handling case. The "special handling indicatio= n" is got but the unexpected condition is encountered. Seem as above. > The Destination Address field in the IPv6 Header MUST change to the > nexthop BFR's End.BIER Unicast address in BIERv6. > > The Hop Limit field of IPv6 header MUST decrease by 1 when sending > packets to a BFR neighbor, while the TTL in the BIER header MUST be > unchanged on a Non-BIER router, or decrease by 1 on a BFR. A non-BIER router would not operate on the BIER header or be addressed by a BIERv6 packet, so the middle part should be deleted, as its confusing. [XJR28] Please see explanation of [XJR3]. > The BitString in the BIER header in the Destination Options Header > may change when sending packets to a neighbor. Such change of > BitString MUST be aligned with the procedure defined in RFC8279. > Because of the requirement to change the content of the option when > forwarding BIERv6 packet, the BIER option type should have chg flag 1 > per section 4.2 of RFC8200. Maybe reorder these paragraphs in the order they are relevant, whereas the BIER processing would preceed the unicast sending of copies. [XJR29] Correct, the BIER processing would precede the sending of copies. > The procedures applies normally if a bit corresponding to the self > bfr-id is set in the bit-string field of the Non-MPLS BIER header of > the BIERv6 packet. The node is considered to be an Egress BFR (BFER) > in this case. he BFER removes the BIERv6 header, including the IPv6 > header and the Destination Options header, and copies the packet to > the multicast flow overlay. The egress VRF of a packet may be > determined by a further lookup on the IPv6 source address instead of > the upstream-assigned MPLS Label as described in [RFC8556]. Maybe you want to structure under subsections "BFIR", "BFR" and "BFER" beha= vior. In the BFER behavior it should be said that the BFER behavior is in addition to the unchanged BFER behavior and is based on creating another copy of the packet based on the BFER bit set, and that copy is locally consumed as follow.. [XJR30] Editorial suggestion noted. End of answer so far. Running out of time for now, hopefully can catch up with rest later. Very good for the document to have what looks on browsing like a comprehensive set of environmental sections below! Thanks a lot for the documt Toerless -----Original Message----- From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Toerless Eckert Sent: Thursday, March 12, 2020 12:24 PM To: bier@ietf.org Subject: [Bier] comments for draft-xie-bier-ipv6-encapsulation-05.txt Comments on subject document inline. Thanks a lot for the work. --_000_d4c4d4a308d847fbb8952aeb49baff11huaweicom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Toerless,

 

Please find below my answer = 20-30 (for section 4 of this draft) marked as [XJR20] to [XJR30] in blue text= .

 

Thanks

Jingrong

 

 

> 4.  BIERv6 Packet Processing

>   = There is no BIER-specific processing,

 

? Unclear.=

[XJR20]= Editorial suggestion noted. Please allow me find some better text here.

&= nbsp;

>   = and all the 8 steps in section

>   = 6.5 of RFC8279 apply to BIERv6 packet processing. = ; However, there are

>   = some IPv6-specific processing procedures due to the b= ase and general

>   = procedures of IPv6.

>

>   = On the overlay layer, when a multicast packet enters = the BIER domain

>   = in a Non-MPLS IPv6 network, the Ingress BFR (BFIR) en= capsulates the

>   = multicast packet with a BIERv6 Header, transforming i= t to a BIERv6

 

Encapsulates instead of tran= sform IMHO.

[XJR21]= Editorial suggestion noted.

&= nbsp;

>   = packet.  The BIERv6 h= eader includes an IPv6 header and IPv6

>   &= nbsp;Destination Options Header within a standa= rd Non-MPLS BIER header.

>   = Source Address field in the IPv6 header MUST be set t= o a routable

>   = IPv6 unicast address of the BFIR.  Destination Address field in the

>   = IPv6 header is set to the End.BIER address of the nex= t-hop BFR the

>   = BIERv6 packet replicating to, no matter next-hop BFR = is directly

>   = connected (one-hop) or not directly connected (multi-= hop).

 

I think it would be good to = provide in a fitting place some good

justification/examples why e= specially BFR not acting as BFER  would

benefit from using any other= addresses than the BIER prefix of the BFR.

[XJR22]= Combining the BFR-prefix with the End.BIER address is the previous (before= rev-04) proposal of this draft.

We chan= ge this for some reasons:

(1) Pla= n and allocate End.BIER of “all nodes= ” of a net= work from a block, so the ACL can be easily deployed on each node, as explained= in chapter 5.

(2) Dec= ouple the two for better management: network administrator may be used to c= onfigure a BFR-prefix from the loopback address that is used for BGP peer/T= unnel Endpoint, while End.BIER block is a different thing need care for secure deployment.

&= nbsp;

>   = It is a local behavior to handle the combination of e= xtension

>   = headers, options and the BIER option(s) in destinatio= n options header

>   = when a 'BIER Specific Handling' indication is got by = the preceding

>   = FIB lookup.  Early de= ployment of BIERv6 may require there is only one

>   = BIER option TLV in the destination options header fol= lowed the IPv6

>   = header.  How other ex= tension headers or more BIER option TLVs in a

>   = BIERv6 packet is handled is outside the scope of this= document.

 

Typically AFAIK, the handlin= g of option headers is not tied to a

avarying semantic of the des= tination address. I do understand that

IPv6 SIDs have semantic tied= to them, but is there an example how such

a semantic would impact the = handling of a particular destination option ?

If there is, then it would b= e good to cite such an SRv6 function as another

example of the desired behav= ior in this draft.

[XJR23]= I agree with you that IPv6 option headers is not tied to a special destina= tion address in IPv6 spec.

But tha= t does not fit the “forwardin= g-plane-realities” for the past 25 years(see below pdf you co-authoring).

https://datatracker.ie= tf.org/meeting/104/materials/slides-104-wgtlgo-forwarding-plane-realities

“Processing that spans multiple headers increases complexity and e= liminates opportunities for optimizations”

“don’t assume complete processing flexibility.”

I think= the above text are saying the IPv6-spec next-header chain and option TLV c= hain that “not tied<= /span>” to a spec= ific destination address.=

And tha= t’s why th= e preceding indication of “IPv6 DA” lookup is = useful.

Once th= e “IPv6 DA= ” lookup of specific destination address determine that it is a special addr= ess (BIER-only address), then only the least thing is necessary, and “unexpecte= d conditions” are all shortcut handled (see below XJR26 and XJR27).

&= nbsp;

I for once think that the id= ea of being able to modify the semantic

of option headers based on t= he address is potentially useful (would need

to figure out better example= s), but:

[XJR24]= I agree. Why not exploring ;-)

&= nbsp;

If there is a relevant custo= mer community for BIERv6 that is not interested

in SRv6, it would be better = if the base functionality would not rely

on SRv6 specific concepts, b= ut if these SRv6/SID related options would be

part of a specific section i= n this document like "BIERv6 with SIDs" or so.<= /p>

That way bot the IPv6, no SR= v6 and IPv6+SRv6 customers would easier be

made happy.

[XJR25]= I don’t s= ee how the “SRv6 spec= ific concepts” affect the independency of BIERv6.

As stat= ed before, SRv6 concept is only a thin layer over IPv6 to me.

It’s all about fo= rwarding-plane realities in my understanding!

Your th= oughts?

 

&= nbsp;

>   = A packet having a 'BIER Specific Handling' indication= but not having

>   = a BIER option is supposed to be a wrong packet or an = ICMPv6 packet,

Explain the "ICMPv6 pac= ket" ?

[XJR26]= This is an exception-handling case. The “special h= andling indication” is got but the unexpected condition is encountered.

A packe= t having a ‘BIER specific ha= ndling’ bu= t doesn’t get the expected thing, then the ‘exception handling’ is triggered.

The abo= ve is such “exception handli= ng”, which= can be discarding a packet, or checking further if it is ICMPv6 packet.

&n= bsp;

&= nbsp;

>   = A packet not having a 'BIER Specific Handling' indica= tion but having

>   = a BIER option SHOULD be processed normally as unicast= forwarding

>   = procedures, which may be a behavior of drop, or send = to CPU, or other

>   = behaviors in existing implementations.

 

SHOULD be processed normally= as unicast forwarding procedures AFTER

BIER replication ? E.g.: not= quite sure which case yo're referring to here.

[XJR27]= This is an exception-handling case. The “special h= andling indication” is got but the unexpected condition is encountered.

Seem as= above.

&= nbsp;

>   = The Destination Address field in the IPv6 Header MUST= change to the

>   = nexthop BFR's End.BIER Unicast address in BIERv6.

>

>   = The Hop Limit field of IPv6 header MUST decrease by 1= when sending

>   = packets to a BFR neighbor, while the TTL in the BIER = header MUST be

>   = unchanged on a Non-BIER router, or decrease by 1 on a= BFR.

 

A non-BIER router would not = operate on the BIER header or be addressed

by a BIERv6 packet, so the m= iddle part should be deleted, as its confusing.

[XJR28]= Please see explanation of [XJR3].

&= nbsp;

>   = The BitString in the BIER header in the Destination O= ptions Header

>   = may change when sending packets to a neighbor.=   Such change of

>   = BitString MUST be aligned with the procedure defined = in RFC8279.

>   = Because of the requirement to change the content of t= he option when

>   = forwarding BIERv6 packet, the BIER option type should= have chg flag 1

>   = per section 4.2 of RFC8200.

 

Maybe reorder these paragrap= hs in the order they are relevant, whereas

the BIER processing would pr= eceed the unicast sending of copies.

[XJR29]= Correct, the BIER processing would precede the sending of copies.

&= nbsp;

>   = The procedures applies normally if a bit correspondin= g to the self

>   = bfr-id is set in the bit-string field of the Non-MPLS= BIER header of

>   = the BIERv6 packet. = The node is considered to be an Egress BFR (BFER)

>   = in this case.  he BFE= R removes the BIERv6 header, including the IPv6

>   = header and the Destination Options header, and copies= the packet to

>   = the multicast flow overlay.  The egress VRF of a packet may be

>   = determined by a further lookup on the IPv6 source add= ress instead of

>   = the upstream-assigned MPLS Label as described in [RFC= 8556].

 

Maybe you want to structure = under subsections "BFIR", "BFR" and "BFER" be= havior.

In the BFER behavior it shou= ld be said that the BFER behavior is in

addition to the unchanged BF= ER behavior and is based on creating another

copy of the packet based on = the BFER bit set, and that copy is locally

consumed as follow..

[XJR30]= Editorial suggestion noted.

End of = answer so far.

&= nbsp;

Running out of time for now,= hopefully can catch up with rest later.

Very good for the document t= o have what looks on browsing like a

comprehensive set of environ= mental sections below!

&n= bsp;

&= nbsp;

Thanks a lot for the documt<= o:p>

    Toerless

 

 

-----Original Message----- From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Toerless Eckert
Sent: Thursday, March 12, 2020 12:24 PM
To: bier@ietf.org
Subject: [Bier] comments for draft-xie-bier-ipv6-encapsulation-05.txt

 

Comments on subject document= inline. Thanks a lot for the work.

 

--_000_d4c4d4a308d847fbb8952aeb49baff11huaweicom_-- From nobody Fri Mar 13 16:15:23 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5A60A3A120F for ; Fri, 13 Mar 2020 16:15:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.616 X-Spam-Level: X-Spam-Status: No, score=0.616 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FAKE_REPLY_C=1.486, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id P1spL4uLydN5 for ; Fri, 13 Mar 2020 16:15:19 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F04013A120B for ; Fri, 13 Mar 2020 16:15:18 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 6F479548047; Sat, 14 Mar 2020 00:15:13 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id 67049440040; Sat, 14 Mar 2020 00:15:13 +0100 (CET) Date: Sat, 14 Mar 2020 00:15:13 +0100 From: Toerless Eckert To: "Xiejingrong (Jingrong)" Cc: "bier@ietf.org" Message-ID: <20200313231513.GA64126@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] comments for draft-xie-bier-ipv6-encapsulation X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Mar 2020 23:15:22 -0000 Jingrong, *: Some higher level Q)uestions P)oints hopefully we can circle in on the probably most important issues for the details before getting back to my nitpicking on details. Q1: Why is https://tools.ietf.org/html/draft-xie-bier-ipv6-mvpn-02 expired and not even referenced in draft-xie-bier-ipv6-encapsulation ? If i wanted to understand why the encap does the BFIR-to-BFER IPv6 encap with option header, then the reason really is to enable 'MVPN' over BIER, right ? So one would like to know where that is specified, which seems to be that mvpn draft of yours, right ? Aka: should be refreshed and referenced ? Q2: I am totally not on top of BESS, but it seems thats where the SRv6 version of e.g.: MVPN (over MPLS) is defined ? And those solutoins are called 'overlay' because there are on top of IPv6, but functionally its mostly equialent to what we've done over MPLS forever without calling it overlay, right ? (sorry, just trying to unconfuse myself, not really about your draft, but more the question what makes a soution 'overlay', and it seems just : replace MPLS with IPv6 and stuff running on top of it must be named overlay ?). P3: The ability of the choosen header to pass 6man RFC8200 police seems quite important. See how long SRH draft was hold up in the discuss. I am not aware whether there is evidence that any other destination option today does what the routing header, e.g.: RFC6554/SRH are doing, keeping the source address while changing the dest address. If they do not like destination option header, it could become a routing header. If anyone in 6man has rfc8200 concerns, its always possible to make this doc an update to rfc8200, which shouldn't be such a blood bath as for SRv6 given how its about effectively multicast packets, and there was very little multicast expertise involved in writing these IPv6 documents. Aka: present/discuss at 6man WG IMHO if not already done. P4: Wrt. SRv6: As soon as you embody SRv6 SID semantic into IPv6 addresses, i think you are doing SRv6 architecture. Only a minority (40% by a cisco estimate) of SRv6 use cases ever need SRH, the rest is just SID semantics and non-LDP routing for simple IPv6 packets. P5: Wrt. SIDs: I was mostly worried about manual or SDN controller assignment of the SIDs (like source addresses in BIERv6), but it seems the appropriate BGP signaling mechanisms in BESS documents similar to those done in the past for MVPN with MPLS (in other WGs) would allow for automatic allocation and signaling. I think some sentences to the point that this is designed to be easily autoconfiguring the addresses it needs or the like would help to counter such concerns as i had first reading it. P6: The main concern by the WG seems to be how simple the lookup can be made. We already discussed this our last email round: Ability to do a FIB lookup (because its a BIER SID) that results in an lookup entry of an unchanged BIER header doing unchanged BIER operations, followed just by a different adjacency than for MPLS. In MPLS you would swap the destination label (but keep the), here you would swap the destination IPv6 address. Have you tried building a P4 reference implementation ? Typically, when something is shown to be implementable in P4, then its harder for higher end NPU vendors to argue their NPU can not do this efficiently ;-) Overall, i think it might help to think about summarizing the key parts of relevance to the WG to decide somewhere up front in the doc: - Support for L3VPN and 'Internet' multicast services via IPv6 with BIER. - Single FIB lookup to unchanged BIER header and processing - Swap MPLS label replaced by swap IPv6 destination addess - Leverages simple subset of SRv6 architecture for SID addressing, - No SRH used. 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Sun, 15 Mar 2020 03:33:31 +0000 Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by nkgeml707-chm.china.huawei.com (10.98.57.157) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Sun, 15 Mar 2020 11:33:28 +0800 Received: from nkgeml705-chm.china.huawei.com ([10.98.57.154]) by nkgeml705-chm.china.huawei.com ([10.98.57.154]) with mapi id 15.01.1713.004; Sun, 15 Mar 2020 11:33:28 +0800 From: "Xiejingrong (Jingrong)" To: Toerless Eckert CC: "bier@ietf.org" , "tonysietf@gmail.com" , "gjshep@gmail.com" , "aretana.ietf@gmail.com" Thread-Topic: [Bier] comments for draft-xie-bier-ipv6-encapsulation Thread-Index: AQHV+Y1Mk8ekwv+g5kqtAwzNseD/hKhI/nyA Date: Sun, 15 Mar 2020 03:33:28 +0000 Message-ID: <53317074a12e4772921e13cd1b1c915a@huawei.com> References: <20200313231513.GA64126@faui48f.informatik.uni-erlangen.de> In-Reply-To: <20200313231513.GA64126@faui48f.informatik.uni-erlangen.de> Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.45.219.173] Content-Type: multipart/alternative; boundary="_000_53317074a12e4772921e13cd1b1c915ahuaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Bier] comments for draft-xie-bier-ipv6-encapsulation X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Mar 2020 03:33:38 -0000 --_000_53317074a12e4772921e13cd1b1c915ahuaweicom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Toerless, Thanks a lot for the higher level questions and points! Please see below inline my answer [A1] to [A7]. Cc'ed the chairs and AD since I think it is related ---- see answer 3 [A3] = to point 3. Best regards, Jingrong -----Original Message----- From: Toerless Eckert [mailto:tte@cs.fau.de] Sent: Saturday, March 14, 2020 7:15 AM To: Xiejingrong (Jingrong) Cc: bier@ietf.org Subject: Re: [Bier] comments for draft-xie-bier-ipv6-encapsulation Jingrong, *: Some higher level Q)uestions P)oints hopefully we can circle in on the prob= ably most important issues for the details before getting back to my nitpic= king on details. Q1: Why is https://tools.ietf.org/html/draft-xie-bier-ipv6-mvpn-02 expired = and not even referenced in draft-xie-bier-ipv6-encapsulation ? If i wanted to understand why the encap does the BFIR-to-BFER IPv6 encap wi= th option header, then the reason really is to enable 'MVPN' over BIER, right ? So one would like to know where that is specified, which= seems to be that mvpn draft of yours, right ? Aka: should be refreshed and= referenced ? [A1]: The reason it's not referenced is that, I think the layering mode of = BIER-layer and Multicast-overlay-layer is quite clear as is defined in RFC8= 279 section 4. The BIER-IPv6 is the basis and the BIERv6-MVPN is overlay. I am not aware of that it could be a confusing. Maybe an informative reference to the BIERv6-MVPN ? BTW: the https://tools.ietf.org/html/draft-xie-bier-ipv6-mvpn-02 is not exp= ired. Q2: I am totally not on top of BESS, but it seems thats where the SRv6 vers= ion of e.g.: MVPN (over MPLS) is defined ? And those solutoins are called '= overlay' because there are on top of IPv6, but functionally its mostly equi= alent to what we've done over MPLS forever without calling it overlay, righ= t ? (sorry, just trying to unconfuse myself, not really about your draft, b= ut more the question what makes a soution 'overlay', and it seems just : re= place MPLS with IPv6 and stuff running on top of it must be named overlay ?= ). [A2] SRv6 based services(VPN,EVPN,etc) are all defined in but MVPN is excluded. The name of overlay seems to me more like coming from NVO3 ---- where the u= nderlay is IP/IPv6, and overlay means VPN/EVPN/MVPN including the Tenant pa= cket and Tenant identifier (VNI). The name of overlay has been common in drafts and RFCS ---- RFC8279 is one = example, many other BESS drafts also use the name, but no strict definition= yet. I understand the same as you that its mostly equivalent to what have done o= ver MPLS, with distinct I understand is that the layering of overlay and un= derlay is not well decoupled, e.g., underlay is driven by overlay like the = mLDP/RSVP-TE is driven by MVPN to build a tree. So be relaxed about the concept of overlay and just follow the feeling: Overlay =3D service (VPN/EVPN IRB/L2VPN/MVPN/etc), Underlay =3D transport(IP/routing/reachability/LSP/tunnel/etc). P3: The ability of the choosen header to pass 6man RFC8200 police seems qui= te important. See how long SRH draft was hold up in the discuss. I am not aware whether there is evidence that any other destination option = today does what the routing header, e.g.: RFC6554/SRH are doing, keeping th= e source address while changing the dest address. If they do not like destination option header, it could become a routing he= ader. If anyone in 6man has rfc8200 concerns, its always possible to make t= his doc an update to rfc8200, which shouldn't be such a blood bath as for S= Rv6 given how its about effectively multicast packets, and there was very l= ittle multicast expertise involved in writing these IPv6 documents. Aka: present/discuss at 6man WG IMHO if not already done. [A3] I haven't found any other destination option today does what the routi= ng header either. If we do not like destination option header, it could become a routing head= er, or a new extension header could also be proposed, and I have thought ab= out that too. It's allowed in RFC8200 to define extension header, or develop Option in DO= H (recommended by 8200), and I think it's up to us BIER folks to talk about= the tech aspects ----use cases, benefits, costs and impacts. Let me cite some words of 6man chair Ole's view of point here: "we cannot modify our documents on every occasion someone wants to do somet= hing". "It shouldnt' matter if it contravened or not. As long as the proposed solu= tion was technically sound standing on it's own feet." "Any specification that changes EH processing must specify how that process= ing is done, and must be technically sound, in that it is shown not to brea= k anything (interoperability, PMTUD, end to end security etc)." BTW: I had once named the draft as draft-xie-6man-bier-encapsulation-00 and= post on 6man mailing list but no feedback. https://mailarchive.ietf.org/arch/msg/ipv6/8OGREpYjWGAHgSRKLUwE_--qfVU/ Reading the BIER charter text again, I'm not sure the coordination should b= e initiated by BIER WG after it becomes a WG I-D, or by the individual auth= ors to request that ? "7) BIER in IPv6 : A mechanism to use BIER natively in IPv6 may be standar= dized if coordinated with the 6MAN WG and with understood applicability." Maybe it's up to the chairs or AD to give guidance for this situation ? P4: Wrt. SRv6: As soon as you embody SRv6 SID semantic into IPv6 addresses,= i think you are doing SRv6 architecture. Only a minority (40% by a cisco estimate) of SRv6 use cases ever need SRH, the rest is just SID semantics a= nd non-LDP routing for simple IPv6 packets. [A4] Got your point. Much or less the SRv6 ingredients, it's IETF standard-= track for us to learn from: RFC8402, RFC8754. P5: Wrt. SIDs: I was mostly worried about manual or SDN controller assignme= nt of the SIDs (like source addresses in BIERv6), but it seems the appropri= ate BGP signaling mechanisms in BESS documents similar to those done in the= past for MVPN with MPLS (in other WGs) would allow for automatic allocatio= n and signaling. I think some sentences to the point that this is designed = to be easily autoconfiguring the addresses it needs or the like would help = to counter such concerns as i had first reading it. [A5] Correct. The assignment of the IPv6 addresses (you called SIDs) can be= easily automated by SDN. The source address in BIERv6 only need to be allocated on an Ingress PE of = MVPN, and advertise to Egress PE of MVPN using BGP-MVPN routes. The destination address in BIERv6 only need to be allocated from the planne= d block of IPv6 address. The standard-track RFC8754 sets up such paradigm, not only for data-plane o= ptimization (below point P6), but also for security deployment to be easily= automated (5.1 of 8754). P6: The main concern by the WG seems to be how simple the lookup can be mad= e. We already discussed this our last email round: Ability to do a FIB lookup (because its a BIER SID) that results in an look= up entry of an unchanged BIER header doing unchanged BIER operations, follo= wed just by a different adjacency than for MPLS. In MPLS you would swap the= destination label (but keep the), here you would swap the destination IPv6= address. Have you tried building a P4 reference implementation ? Typically, when something is shown to be implementable in P4, then its hard= er for higher end NPU vendors to argue their NPU can not do this efficientl= y ;-) [A6] I believe it's the simplest paradigm settled by RFC8754. It may need t= o compare with the alternatives to understand that. Haven't try P4 yet. Overall, i think it might help to think about summarizing the key parts of = relevance to the WG to decide somewhere up front in the doc: - Support for L3VPN and 'Internet' multicast services via IPv6 with BIER. - Single FIB lookup to unchanged BIER header and processing - Swap MPLS label replaced by swap IPv6 destination addess - Leverages simple subset of SRv6 architecture for SID addressing, - No SRH used. [A7] Agreed. That's the key parts of the BIERv6 design in my opinion. Cheers Toerless --_000_53317074a12e4772921e13cd1b1c915ahuaweicom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Toerless,

 

Thanks a lot for the higher = level questions and points!

Please see below inline my a= nswer [A1] to [A7].

Cc’ed the chairs and AD since I think it is related ---- see answer 3 = [A3] to point 3.

 

Best regards,

Jingrong

 

-----Original Message----- From: Toerless Eckert [mailto:tte@cs.fau.de]
Sent: Saturday, March 14, 2020 7:15 AM
To: Xiejingrong (Jingrong) <xiejingrong@huawei.com>
Cc: bier@ietf.org
Subject: Re: [Bier] comments for draft-xie-bier-ipv6-encapsulation

 

Jingrong, *:

 

Some higher level Q)uestions= P)oints hopefully we can circle in on the probably most important issues f= or the details before getting back to my nitpicking on details.<= /span>

 

Q1: Why is https://tools.ietf.or= g/html/draft-xie-bier-ipv6-mvpn-02 expired and not even referenc= ed in draft-xie-bier-ipv6-encapsulation ?

 

If i wanted to understand wh= y the encap does the BFIR-to-BFER IPv6 encap with option header, then the r= eason really is to enable 'MVPN'

over BIER, right ? So one wo= uld like to know where that is specified, which seems to be that mvpn draft= of yours, right ? Aka: should be refreshed and referenced ?

[A1]: T= he reason it’s not referenced is that, I think the layering mode of BIER-layer and Multicast-overlay-layer is quite clear as is defined in RFC8279 sectio= n 4.

The BIE= R-IPv6 is the basis and the BIERv6-MVPN is overlay.

I am no= t aware of that it could be a confusing.

Maybe a= n informative reference to the BIERv6-MVPN ?

BTW: th= e https://tools.ietf.org/html/draft-xie-bier-ipv6-= mvpn-02 is not expired.

&= nbsp;

Q2: I am totally not on top = of BESS, but it seems thats where the SRv6 version of e.g.: MVPN (over MPLS= ) is defined ? And those solutoins are called 'overlay' because there are o= n top of IPv6, but functionally its mostly equialent to what we've done over MPLS forever without calling it o= verlay, right ? (sorry, just trying to unconfuse myself, not really about y= our draft, but more the question what makes a soution 'overlay', and it see= ms just : replace MPLS with IPv6 and stuff running on top of it must be named overlay ?).=

[A2] SR= v6 based services(VPN,EVPN,etc) are all defined in <draft-ietf-bess-srv6= -services> but MVPN is excluded.

The nam= e of overlay seems to me more like coming from NVO3 ---- where the underlay= is IP/IPv6, and overlay means VPN/EVPN/MVPN including the Tenant packet an= d Tenant identifier (VNI).

The nam= e of overlay has been common in drafts and RFCS ---- RFC8279 is one example= , many other BESS drafts also use the name, but no strict definition yet.

I under= stand the same as you that its mostly equivalent to what have done over MPL= S, with distinct I understand is that the layering of overlay and underlay = is not well decoupled, e.g., underlay is driven by overlay like the mLDP/RSVP-TE is driven by MVPN to build a tr= ee.

So be r= elaxed about the concept of overlay and just follow the feeling:

Overlay= =3D service (VPN/EVPN IRB/L2VPN/MVPN/etc),

Underla= y =3D transport(IP/routing/reachability/LSP/tunnel/etc).<= /p>

 

&= nbsp;

P3: The ability of the choos= en header to pass 6man RFC8200 police seems quite important. See how long S= RH draft was hold up in the discuss.

I am not aware whether there= is evidence that any other destination option today does what the routing = header, e.g.: RFC6554/SRH are doing, keeping the source address while chang= ing the dest address.

 

If they do not like destinat= ion option header, it could become a routing header. If anyone in 6man has = rfc8200 concerns, its always possible to make this doc an update to rfc8200= , which shouldn't be such a blood bath as for SRv6 given how its about effectively multicast packets, and there w= as very little multicast expertise involved in writing these IPv6 documents= .

 

Aka: present/discuss at 6man= WG IMHO if not already done.

[A3] I = haven’t fo= und any other destination option today does what the routing header either.

If we d= o not like destination option header, it could become a routing header, or = a new extension header could also be proposed, and I have thought about tha= t too.

It’s allowed in R= FC8200 to define extension header, or develop Option in DOH (recommended by 8200), and I think it’s up to us BIER folks to talk about the tech aspects ----us= e cases, benefits, costs and impacts.

&n= bsp;

Let me = cite some words of 6man chair Ole’s view of point here:

“we cannot modify our documents on every occasion someone wants to= do something”.

“It shouldnt' matter if it contravened or not. As long as the prop= osed solution was technically sound standing on it's own feet.= 221;

“Any specification that changes EH processing must specify how tha= t processing is done, and must be technically sound, in that it is shown not to break anything (interoperability, PMTUD, end to end sec= urity etc).”

&n= bsp;

BTW: I = had once named the draft as draft-xie-6man-bier-encapsulation-00 and post o= n 6man mailing list but no feedback.

https://mailarchive.ietf.org/arch/msg/ipv6/8OG= REpYjWGAHgSRKLUwE_--qfVU/

&n= bsp;

Reading= the BIER charter text again, I’m not sure the coordination should be initiated by BIER WG after it becomes a WG I-D, or by the individual authors to requ= est that ?

“7) BIER in IPv6 :  A mechanism to use BIER natively in IPv6 may be standardized if coordinate= d with the 6MAN WG and with understood applicability.”

Maybe i= t’s up to = the chairs or AD to give guidance for this situation ?

 

&= nbsp;

P4: Wrt. SRv6: As soon as yo= u embody SRv6 SID semantic into IPv6 addresses, i think you are doing SRv6 = architecture. Only a minority (40% by a cisco

estimate) of SRv6 use cases = ever need SRH, the rest is just SID semantics and non-LDP routing for simpl= e IPv6 packets. 

[A4] Go= t your point. Much or less the SRv6 ingredients, it’= s IETF standard-track for us to learn from: RFC8402, RFC8754.  =

 

&= nbsp;

P5: Wrt. SIDs: I was mostly = worried about manual or SDN controller assignment of the SIDs (like source = addresses in BIERv6), but it seems the appropriate BGP signaling mechanisms= in BESS documents similar to those done in the past for MVPN with MPLS (in other WGs) would allow for automat= ic allocation and signaling. I think some sentences to the point that this = is designed to be easily autoconfiguring the addresses it needs or the like= would help to counter such concerns as i had first reading it.

[A5] Co= rrect. The assignment of the IPv6 addresses (you called SIDs) can be easily= automated by SDN.

The sou= rce address in BIERv6 only need to be allocated on an Ingress PE of MVPN, a= nd advertise to Egress PE of MVPN using BGP-MVPN routes.

The des= tination address in BIERv6 only need to be allocated from the planned block= of IPv6 address.

The sta= ndard-track RFC8754 sets up such paradigm, not only for data-plane optimiza= tion (below point P6), but also for security deployment to be easily automa= ted (5.1 of 8754).

 

&= nbsp;

P6: The main concern by the = WG seems to be how simple the lookup can be made. We already discussed this= our last email round:

Ability to do a FIB lookup (= because its a BIER SID) that results in an lookup entry of an unchanged BIE= R header doing unchanged BIER operations, followed just by a different adja= cency than for MPLS. In MPLS you would swap the destination label (but keep the), here you would swap the destina= tion IPv6 address.

 

Have you tried building a P4= reference implementation ?

Typically, when something is= shown to be implementable in P4, then its harder for higher end NPU vendor= s to argue their NPU can not do this efficiently ;-)

[A6] I = believe it’s the simplest paradigm settled by RFC8754. It may need to compare with the alternatives to understand that.

Haven’t try P4 ye= t.

 

&= nbsp;

Overall, i think it might he= lp to think about summarizing the key parts of relevance to the WG to decid= e somewhere up front in the doc:

 

- Support for L3VPN and 'Int= ernet' multicast services via IPv6 with BIER.

- Single FIB lookup to uncha= nged BIER header and processing

- Swap MPLS label replaced b= y swap IPv6 destination addess

- Leverages simple subset of= SRv6 architecture for SID addressing,

- No SRH used.

[A7] Ag= reed. That’s the key parts of the BIERv6 design in my opinion.

 

&= nbsp;

Cheers

    Toerless<= o:p>

 

--_000_53317074a12e4772921e13cd1b1c915ahuaweicom_-- From nobody Sun Mar 15 10:30:19 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9D50E3A196E; Sun, 15 Mar 2020 10:30:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EF2Td2pOORXB; Sun, 15 Mar 2020 10:30:15 -0700 (PDT) Received: from mail-io1-xd30.google.com (mail-io1-xd30.google.com [IPv6:2607:f8b0:4864:20::d30]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C8D0C3A1970; Sun, 15 Mar 2020 10:30:14 -0700 (PDT) Received: by mail-io1-xd30.google.com with SMTP id w9so14758660iob.12; Sun, 15 Mar 2020 10:30:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=pmwQDM9IA6JrTqOCJn1uy8a9Xm5krvfTTIcsxY/V9rk=; b=dX5t6STS25FNquEWF6eY/vxi0THoZ/QZYflMvtUEzPhNRXbowc9U6mDRWnGD6stJHE mmBDiSXeb5qcsQ9vbNICqzTrKNNEAEA6kZ4UidF65zN4X+DJOgckn7YMDgfKqfkBwqhW LUH1YPGK1YCK8TtaRfmfFjlfvO6YfkSsrICe3UFVQHQnMW2WBeSab38jKfXb3khg8YLu ryHycWYXEcc9hK204qh4AZN2wxbxWdMW41j/Y5pd4mTMCWFjlV+PNF9rI3mBrbo9rvfa f4rQVmutt0Q4++mBFTFYdV9H1Ph1TGscJ1kM3s2msLsJSKYRoVrWXbS47tp/rIC6+JJw TT8A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=pmwQDM9IA6JrTqOCJn1uy8a9Xm5krvfTTIcsxY/V9rk=; b=S3IsZOSneorbt5D+g7mDbBIVFE1uhd0CURqtk+TkAEVEwTWNGbKanoOd7BR2u5PGcq O5igpkF+JFgXqiztSHC+7pcrJi9/PRGWjxqGAdw6srfZLI1zCvv3QnNr7Y3Teu302j7V n1TTMUQvV+I0zYWsB48/VnqUFtOCuD2Z1WST+GsPwY4wwbQLfmF4sWY62A6Ax0n3C5d5 xrARh+TCFmrJ4MAe1J0fEXl6eaSQblzzZ61nq2O8tqhibqKrHJJT05sHQKSOuS9fLQ/F rPnXUDTPAD1B/a9EvgDkZ0wpDGl/cPOL/vRyk6Byg6XLihR7uao5+Ad4vPrH+K4nhU2P A6ng== X-Gm-Message-State: ANhLgQ2MTcSOPy2Yw/2IqHWgiNae/ENuiJ6THZKcPwjLniVbYaHnj2LV gFgbEBZod1Zljz4T6EwzF5z9crqV3jfFYLfOObd9y6Hf X-Google-Smtp-Source: ADFU+vsQfdUT6N7SWOMo6YNeTmscvXfumayEFF28a75dujxtu6yqRU054JoDegQWtoiszTsgTk5T52RqvPYVMeLStPo= X-Received: by 2002:a02:dc6:: with SMTP id 189mr20998171jax.100.1584293413976; Sun, 15 Mar 2020 10:30:13 -0700 (PDT) MIME-Version: 1.0 References: <202002221016475538682@zte.com.cn> <202003141013232072281@zte.com.cn> In-Reply-To: <202003141013232072281@zte.com.cn> From: Tony Przygienda Date: Sun, 15 Mar 2020 10:28:35 -0700 Message-ID: To: "zhang.zheng" Cc: BIER WG , BIER WG Chairs Content-Type: multipart/alternative; boundary="00000000000028ff3005a0e80e2f" Archived-At: Subject: Re: [Bier] Call for remote presentation---Re: Call for BIER presentation items in IETF107# X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Mar 2020 17:30:17 -0000 --00000000000028ff3005a0e80e2f Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Once we have enough presenters we will look @ the slot and what makes sense depending on distribution of people ... -- tony On Fri, Mar 13, 2020 at 7:14 PM wrote: > Hi, > > > Because in-person meeting has been cancelled. Everyone needs to attend > meeting remotely. > > If you want to do remote presentation, please send the request to me. > > The people who sent request to me needs not send to me again. > > But if someone who sent request to me wants to change the presentation, > please let me know. > > > Thanks, > > Sandy > > > > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E5=BC=A0=E5=BE=8100007940 > *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*bier@ietf.org ; > *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*bier-chairs@ietf.org ; > *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B402=E6=9C=8822=E6=97=A5 10:17 > *=E4=B8=BB =E9=A2=98 =EF=BC=9A**[Bier] Call for BIER presentation items i= n IETF107#* > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier > > Hi, > > > We have requested a 2 hour BIER WG meeting slot at IETF107# in Vancouver. > > If you would like to present at that meeting, please send a request with > "Presentation draft, the amount of time, presenter". > > It is possible to present remotely if you are not attending the meeting. > > > Thanks, > > Sandy > > (Secretary) > > > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier > --00000000000028ff3005a0e80e2f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Once we have enough presenters we will look=C2=A0@ th= e slot and what makes sense depending on distribution of people ...

-- tony

On Fri, Mar 13, 2020 at 7:14 PM &l= t;zhang.zheng@zte.com.cn> = wrote:

Hi,


Because in-person meeting has been cancelled. Everyone needs to attend m= eeting remotely.

If you wa= nt to do remote presentation, please send the request to me.

The people who sent request to me needs = not send to me again.

But = if someone who sent request to me wants to change the presentation, please = let me know.


Thanks,

Sandy


<= /p>

=E5=8E=9F=E5=A7=8B=E9=82=AE=E4= =BB=B6
=
____= ___________________________________________
BIER=C2=A0mailing=C2=A0list<= br>BIER@ietf.org
= ht= tps://www.ietf.org/mailman/listinfo/bier

Hi,


We have request= ed a 2 hour BIER WG meeting slot at IETF107# in Vancouver.=C2=A0

If you would like to present at that= meeting, please send a request with "Presentation draft, the amount o= f time, presenter".=C2=A0

It is possible to present remotely if you are not attending the meetin= g.


Thanks,

Sandy

(Secret= ary)


<= /div>


_____________________________= __________________
BIER mailing list
BIER@ietf.org
https://www.ietf.org/mailman/listinfo/bier
--00000000000028ff3005a0e80e2f-- From nobody Mon Mar 16 17:50:45 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 41D373A148D for ; Mon, 16 Mar 2020 17:50:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id G0pE9xZUU4yZ for ; Mon, 16 Mar 2020 17:50:42 -0700 (PDT) Received: from mail-qv1-xf31.google.com (mail-qv1-xf31.google.com [IPv6:2607:f8b0:4864:20::f31]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6F07F3A1488 for ; Mon, 16 Mar 2020 17:50:42 -0700 (PDT) Received: by mail-qv1-xf31.google.com with SMTP id n1so6219372qvz.4 for ; Mon, 16 Mar 2020 17:50:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:reply-to:from:date:message-id:subject:to; bh=mGAbNSvOSZaSByj4s4X8XXh0i+PnAM4kwS4d9rGNe4U=; b=ATVukRjfAVTdzRkpKS6bkP1dAwliuMhC3mRvVHQKJpKteNX/aKEeqRUURpBYM7RuUQ /egaVey3hSaWobQdr9bZEyBpc+q/1ZTj5y2E+EMMYHKrsCuLxd0NVl2dOuPhghS0gSde 2eyJd8cePj8fsw8YCKkH6qDhwalFQYIp7ztXAlAmqPcckQkhdLUO8lLDNBgsky1zzBIw PIb551epY0HABdApeP9nagZDJqX2KKOd35rUfExCpGWHRVdiP09svYPfIvHGkCeMHlJ/ 1pF3C7Y5DdyeaYkmMYUtp6yxZRpQ++AO3GS6yLZ9PA12YUWiWOW4I/LSGv3P3nvKYVnd 5Qow== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:reply-to:from:date:message-id :subject:to; bh=mGAbNSvOSZaSByj4s4X8XXh0i+PnAM4kwS4d9rGNe4U=; b=BTCdCLendQecE7Ua3AxnYoLM48i3EbqEpDzESzyO3D5sfQ520hK0F9qeFdNgFShpfi xVWyxmEeRAvxt5TNvkLN/SupR7FQVR7c0/xB4SA60jm/+v/BlXExIxhNCS/+GCsRXcpS rENePirdyLEkldmddSPUX2FGA5guTCIfgVFliBay296b3niP/BMyVWf06g2xwEbEhpwX UHG8eoAVYJy+yoWrOwLHm4umEAtacXsRp27LntoKaqJ0THyveyh90rjSwitnbIwpNTIX Nc2tUmqvcALLUCozFmPwCJMgRNbO+uEuxpBMBJu28yDHNByLAjE2I2ewS3ZZuztXBBgZ fNtQ== X-Gm-Message-State: ANhLgQ2RyKl+jmsjriuakbiwf1SMavJh2pLgI3yLuATk+C/yeV5qEglK AJ0WGDGMDA/NJy5qiaBxsXYZDKsAcgiJQdNEpR8I8oOX X-Google-Smtp-Source: ADFU+vtxvEAbThrMLUNYhPYKGBX6pIeTSt47ls9BuV4Pg3jcMxjGsQmoWWnk+FMLdkRi9oA7TQNoSGYYHUm/sVXtp/Q= X-Received: by 2002:a05:6214:16d:: with SMTP id y13mr2602706qvs.220.1584406241063; Mon, 16 Mar 2020 17:50:41 -0700 (PDT) MIME-Version: 1.0 Reply-To: gjshep@gmail.com From: Greg Shepherd Date: Mon, 16 Mar 2020 17:50:30 -0700 Message-ID: To: BIER WG Content-Type: multipart/alternative; boundary="0000000000002dba1b05a1025391" Archived-At: Subject: [Bier] Direction: draft-xie-bier-ipv6-encapsulation X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Mar 2020 00:50:44 -0000 --0000000000002dba1b05a1025391 Content-Type: text/plain; charset="UTF-8" draft-xie-bier-ipv6-encapsulation authors, To date, there has been insufficient support on the list to adopt the draft. It is the BIER WG position at this time that a review by the 6man WG should take place before any further discussion in the BIER WG. 6MAN WG review aside, the draft still raises significant technical concerns within the BIER WG. Adding replication information into a programmatic header does NOT add replication to programmatic forwarding path, nor programmatics to your replication forward path. It is at this point where replication begins that all prograrmmatics cease due to the multi-point nature of replication. We have a nearly three decades of experience trying to use unicast semantics to describe multi-point forwarding, and sometimes learning from the past requires leaving it. Thanks you, Chairs --0000000000002dba1b05a1025391 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
draft-xie-bier= -ipv6-encapsulation autho= rs,

To date, there has been insuffi= cient support on the list to adopt the draft. It is the BIER WG position at= this time that a review by the 6man WG should take place before any furthe= r discussion in the BIER WG.

6MAN WG= review aside,=C2=A0the draft still raises significant= technical concerns within the BIER WG. Adding replication information=C2= =A0into a=C2=A0programmatic=C2=A0header does NO= T add replication to=C2=A0programmatic forwarding path, nor programmatics t= o your replication forward path. It is at this point where replication begi= ns that all prograrmmatics cease due to the multi-point nature of replicati= on.=C2=A0 We have a nearly three decades of experience trying to use unicas= t semantics to describe multi-point forwarding, and sometimes learning=C2= =A0from the past requires leaving it.

Thanks you,
Chairs
--0000000000002dba1b05a1025391-- From nobody Mon Mar 16 18:37:44 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 799F93A152F for ; Mon, 16 Mar 2020 18:37:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.87 X-Spam-Level: X-Spam-Status: No, score=-0.87 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3tVKv9o7PaDs for ; Mon, 16 Mar 2020 18:37:40 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A75B23A152C for ; Mon, 16 Mar 2020 18:37:40 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id C57BA54804E; Tue, 17 Mar 2020 02:37:34 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id BCB1A440040; Tue, 17 Mar 2020 02:37:34 +0100 (CET) Date: Tue, 17 Mar 2020 02:37:34 +0100 From: Toerless Eckert To: Greg Shepherd Cc: BIER WG Message-ID: <20200317013734.GA44933@faui48f.informatik.uni-erlangen.de> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] Direction: draft-xie-bier-ipv6-encapsulation X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Mar 2020 01:37:43 -0000 Thanks, Greg, inline On Mon, Mar 16, 2020 at 05:50:30PM -0700, Greg Shepherd wrote: > draft-xie-bier-ipv6-encapsulation authors, > > To date, there has been insufficient support on the list to adopt the > draft. It is the BIER WG position at this time that a review by the 6man WG > should take place before any further discussion in the BIER WG. > > 6MAN WG review aside, the draft still raises significant technical concerns > within the BIER WG. I think this should be a recommendation to both BIER for IPv6 drafts. > Adding replication information into a programmatic header > does NOT add replication to programmatic forwarding path, nor programmatics > to your replication forward path. It is at this point where replication > begins that all prograrmmatics cease due to the multi-point nature of > replication. We have a nearly three decades of experience trying to use > unicast semantics to describe multi-point forwarding, and sometimes > learning from the past requires leaving it. I really do not understand what that means. Can you rephrase that, please ? Maybe also through comparison with Sandy's drafts way to do things ? To me (subject to 6man review) Xie's draft could be a nice way to be relying on the spirit of rfc8200 and the use of Addresses as SIDs to support BIER with IPv6 and VPNs. BIER with MPLS is AFAIK nostly required/desired as a replacement of pre-BIER solutions for MPLS-VPN. How is this supposed to be done with BIER via IPv6 ? Cheers Toerless > Thanks you, > Chairs > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier -- --- tte@cs.fau.de From nobody Tue Mar 17 02:36:48 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 02D533A1BD7 for ; Tue, 17 Mar 2020 02:36:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4IF_xF0mOk3H for ; Tue, 17 Mar 2020 02:36:28 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4E3DC3A1BB0 for ; Tue, 17 Mar 2020 02:36:28 -0700 (PDT) Received: from lhreml702-cah.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id 32D2680958767E9FC5B2; Tue, 17 Mar 2020 09:36:26 +0000 (GMT) Received: from nkgeml708-chm.china.huawei.com (10.98.57.160) by lhreml702-cah.china.huawei.com (10.201.108.43) with Microsoft SMTP Server (TLS) id 14.3.408.0; Tue, 17 Mar 2020 09:36:25 +0000 Received: from nkgeml705-chm.china.huawei.com (10.98.57.154) by nkgeml708-chm.china.huawei.com (10.98.57.160) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Tue, 17 Mar 2020 17:36:23 +0800 Received: from nkgeml705-chm.china.huawei.com ([10.98.57.154]) by nkgeml705-chm.china.huawei.com ([10.98.57.154]) with mapi id 15.01.1713.004; Tue, 17 Mar 2020 17:36:23 +0800 From: "Xiejingrong (Jingrong)" To: "gjshep@gmail.com" , BIER WG Thread-Topic: [Bier] Direction: draft-xie-bier-ipv6-encapsulation Thread-Index: AQHV+/YnqpQ+2LF0LECTKPJw2HcjnahMhjIA Date: Tue, 17 Mar 2020 09:36:23 +0000 Message-ID: <563bd118f7a04882bfa19c6eadf59300@huawei.com> References: In-Reply-To: Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.202.118] Content-Type: multipart/alternative; boundary="_000_563bd118f7a04882bfa19c6eadf59300huaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Bier] Direction: draft-xie-bier-ipv6-encapsulation X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Mar 2020 09:36:46 -0000 --_000_563bd118f7a04882bfa19c6eadf59300huaweicom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 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op12mr4867078ejb.241.1584462746288; Tue, 17 Mar 2020 09:32:26 -0700 (PDT) MIME-Version: 1.0 References: <202002221016475538682@zte.com.cn> <202003141013232072281@zte.com.cn> In-Reply-To: From: Stig Venaas Date: Tue, 17 Mar 2020 09:32:15 -0700 Message-ID: To: Tony Przygienda Cc: "zhang.zheng" , BIER WG , BIER WG Chairs Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [Bier] Call for remote presentation---Re: Call for BIER presentation items in IETF107# X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Mar 2020 16:32:30 -0000 Hi Is there a virtual meeting during what was originally the slot for the Vancouver meeting? I thought most existing WGs were to do meetings later, and that it will be just the sessions listed at https://datatracker.ietf.org/meeting/107/agenda ? That said, as I mentioned to Sandy, I'm happy to do a 5 minute update on the status of the mld draft. Thanks, Stig On Sun, Mar 15, 2020 at 10:30 AM Tony Przygienda wrot= e: > > Once we have enough presenters we will look @ the slot and what makes sen= se depending on distribution of people ... > > -- tony > > On Fri, Mar 13, 2020 at 7:14 PM wrote: >> >> Hi, >> >> >> Because in-person meeting has been cancelled. Everyone needs to attend m= eeting remotely. >> >> If you want to do remote presentation, please send the request to me. >> >> The people who sent request to me needs not send to me again. >> >> But if someone who sent request to me wants to change the presentation, = please let me know. >> >> >> Thanks, >> >> Sandy >> >> >> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 >> =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A=E5=BC=A0=E5=BE=8100007940 >> =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9Abier@ietf.org ; >> =E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9Abier-chairs@ietf.org ; >> =E6=97=A5 =E6=9C=9F =EF=BC=9A2020=E5=B9=B402=E6=9C=8822=E6=97=A5 10:17 >> =E4=B8=BB =E9=A2=98 =EF=BC=9A[Bier] Call for BIER presentation items in = IETF107# >> _______________________________________________ >> BIER mailing list >> BIER@ietf.org >> https://www.ietf.org/mailman/listinfo/bier >> >> Hi, >> >> >> We have requested a 2 hour BIER WG meeting slot at IETF107# in Vancouver= . >> >> If you would like to present at that meeting, please send a request with= "Presentation draft, the amount of time, presenter". >> >> It is possible to present remotely if you are not attending the meeting. >> >> >> Thanks, >> >> Sandy >> >> (Secretary) >> >> >> >> _______________________________________________ >> BIER mailing list >> BIER@ietf.org >> https://www.ietf.org/mailman/listinfo/bier > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier From nobody Tue Mar 17 09:38:11 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C1A353A083F for ; Tue, 17 Mar 2020 09:38:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.871 X-Spam-Level: X-Spam-Status: No, score=-0.871 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JSzl1TH-nv95 for ; Tue, 17 Mar 2020 09:38:07 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 24D253A083E for ; Tue, 17 Mar 2020 09:38:06 -0700 (PDT) Received: from faui48f.informatik.uni-erlangen.de (faui48f.informatik.uni-erlangen.de [131.188.34.52]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 723A0548045; Tue, 17 Mar 2020 17:38:00 +0100 (CET) Received: by faui48f.informatik.uni-erlangen.de (Postfix, from userid 10463) id 668B1440040; Tue, 17 Mar 2020 17:38:00 +0100 (CET) Date: Tue, 17 Mar 2020 17:38:00 +0100 From: Toerless Eckert To: "IJsbrand Wijnands (iwijnand)" Cc: Tony Przygienda , "Nagendra Kumar Nainar (naikumar)" , BIER WG Message-ID: <20200317163800.GA15016@faui48f.informatik.uni-erlangen.de> References: <20200312042429.GA12383@faui48f.informatik.uni-erlangen.de> <00788CA2-6F96-4AC5-BEB5-218C94AEC456@cisco.com> <20200312190230.GB17570@faui48f.informatik.uni-erlangen.de> <20200312202909.GC17570@faui48f.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Mar 2020 16:38:09 -0000 On Tue, Mar 17, 2020 at 02:00:15PM +0000, IJsbrand Wijnands (iwijnand) wrote: > Hi Toerless, > > Picking up on this thread, little late, sorry.. > > > I liked Pierre's bitstring in IPv6 addr, i just felt it was too short to be useful. > > It would disagree, it???s about half the size of what we consider to be the standard interoperable mask of 256. We have defined the Set approach to overcome BM length limitations, at the expense of more copies sent by the ingress. Pun intended, BIER-TE is much more restricted to be useful ???? No pun needed. Valid point: With BIER-TE, the goal is to get tree engineering with bitstrings, so we can get per-packet trees, and we think there will be good use-cases too in more constrained environments, such as broadband access (see our http draft) as well as in 'DetNet' type manufacturing and the like, where hopefully the forwarders (due to lower speeds than 100Gbps++) would be easier to support longer bitstrings as needed. And the length of bitstrings is not nailed in stone forever like in IPv6, so different markets could evolve to support different (longer) length. The 256 is really todays lowest common denominator that we can support in all SP edge/core-routers. With IPv6 via bitstrings in addresses (and correct me if you disagree), the main attraction was the ability of letting applications do BIER without having change APIs/host-stacks. That is cool short-term, but the long-term benefit deteriorates as soon as someone does write a BIER SDK for linux and windows. And with that context in mind i found the long-term limitation of not being able to grow bitstrings in various markets to be too limiting. Cheers Toerless > > Thx, > > Ice. From nobody Tue Mar 17 10:38:03 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1EC3C3A094F for ; Tue, 17 Mar 2020 10:38:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NgGDlpA6U9aW for ; Tue, 17 Mar 2020 10:38:00 -0700 (PDT) Received: from mail-qt1-x834.google.com (mail-qt1-x834.google.com [IPv6:2607:f8b0:4864:20::834]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B84503A095A for ; Tue, 17 Mar 2020 10:38:00 -0700 (PDT) Received: by mail-qt1-x834.google.com with SMTP id g16so18166961qtp.9 for ; Tue, 17 Mar 2020 10:38:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:reply-to:from:date:message-id :subject:to:cc; bh=ROJIVeM7tE7NTZazhcVDMyfS01QQHQGvBS80x7R8tao=; b=niZOq3afexmIHWLq9GMrL1sGWHE9Y7sP8k6oB6pOcaw4O13P0qwenDkhrDyxokUSJR lWwQM8SKlEyDdiph1PwjQ5BjM9Y4Kf42vbx26me33dtIuC1Agq3hLVw2heSA4IiVaAjP It2duIbCffuh/E/SBSA/Luuw4MiEuXbX1v7SnfGL2YvN5U9hDFqAARaRLdY9X1aYrW0h QUMs64NnMlKptnpe6n52s2YX1d1zIXp2k+JmRKdk8tInvvAi8wLsgY0VqXnMBGA1uXPn WGrjhzO8NiXk9obSC+CZmi6bEEvpmpgtO0mb85azXYnBIeJXfXysKnnjWIYiiqlDpfzW WEcw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:reply-to :from:date:message-id:subject:to:cc; bh=ROJIVeM7tE7NTZazhcVDMyfS01QQHQGvBS80x7R8tao=; b=pU95klRNPzQHKED8Xo3uegGScVwfnm7eQgZlHW3sMlntKmPeW+KSYyFxJ2cYKBofEf gTMhSiO4lGTLMMPkvcvmQK+sTV1ToTSchesJPSkDrjMOckq8xH8wh1W1tbBiYUz0JPwc cDSECICDpg7rCUSLYwHLwAyyB69ZDyKwwwGR0dKEDa8kVzsJhNYuZ/Q5lJjHxxhb1Zcv 1thcIBt4duBpxWsdVSbfjF3SvRq5S5kC52qGJyvNlFmOmAPPP/S93QiG780JP//MHFIk Z073Pc6XFpL6/aPVYHvS9KQxipRtn3g/SSZAn7oV4VTKswjKgXi7RN0uOGPea7kwvkD8 wSoA== X-Gm-Message-State: ANhLgQ1lz5YjCkJpHJu3g7SnBZTIN2rY9e+V9I2bsoyu1ig8ovyoUlFq 9xk4kdFDmYH7bpbrFT2SIeIT3JBiozSWuq4rMCJaeg== X-Google-Smtp-Source: ADFU+vsLwVD1S8fWbbWVUn2nf45tiY7pa8depV3ZK+d08EkxQVsiQ3beFuSQf1ur/WjIm8dxK10PsGnzNQPx8xEqbKg= X-Received: by 2002:ac8:1bf5:: with SMTP id m50mr282749qtk.200.1584466679676; Tue, 17 Mar 2020 10:37:59 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Reply-To: gjshep@gmail.com From: Greg Shepherd Date: Tue, 17 Mar 2020 10:37:48 -0700 Message-ID: To: Michael McBride Cc: BIER WG Content-Type: multipart/alternative; boundary="00000000000099c2b005a1106530" Archived-At: Subject: Re: [Bier] Direction: draft-xie-bier-ipv6-encapsulation X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Mar 2020 17:38:02 -0000 --00000000000099c2b005a1106530 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Mike, On Tue, Mar 17, 2020 at 9:27 AM Michael McBride < michael.mcbride@futurewei.com> wrote: > Hi Greg, > > > > *>*To date, there has been insufficient support on the list to adopt the > draft. > > > > We won=E2=80=99t know unless we ask the WG. > > > > >It is the BIER WG position at this time that a review by the 6man WG > should take place before any further discussion in the BIER WG. > > > > You mean the bier chairs position. Either way a punt to 6man for bierv6 > work is fair. We will return and report. > Thanks Mike. Please keep the BIER WG updated on your progress in 6MAN. > >6MAN WG review aside, the draft still raises significant technical > concerns within the BIER WG. Adding replication information into a > programmatic header does NOT add replication to programmatic forwarding > path, nor programmatics to your replication forward path. It is at this > point where replication begins that all prograrmmatics cease due to the > multi-point nature of replication. We have a nearly three decades of > experience trying to use unicast semantics to describe multi-point > forwarding, and sometimes learning from the past requires leaving it. > > > > Perhaps others can help me understand what this means. Regardless, what w= e > will do for the time being, in bier wg, is continue working on gaining bi= er > wg consensus of the requirements, in our draft-ietf-bier-ipv6-requirement= s, > to help steer the wg toward agreeable solutions. > I look forward to further discussions around reqs. Once we have consensus on reqs, the WG will be open to solutions drafts in this space. Thanks again, Chairs (Shep) > mike > > > > > > Thanks you, > > Chairs > --00000000000099c2b005a1106530 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Mike,

On Tue, Mar 17, 2020 at 9:27 AM Michael McBride = <michael.mcbride@future= wei.com> wrote:

Hi Greg,

=C2=A0

>To date, there has been insufficient support on the list to a= dopt the draft.

=C2=A0

We won=E2=80=99t know unless we ask the WG.

=C2=A0

>It is the BIER WG position at this time that a rev= iew by the 6man WG should take place before any further discussion in the B= IER WG.

=C2=A0

You mean the bier chairs position. Either way a punt= to 6man for bierv6 work is fair. We will return and report.


Thanks Mike. Plea= se keep the BIER WG updated on your progress in 6MAN.
=C2=A0

>6MAN WG review aside,=C2=A0the draft still raises significant techni= cal concerns within the BIER WG. Adding replication information=C2=A0into a= =C2=A0programmatic=C2=A0header does NOT add replication to=C2=A0programmatic forwarding path, nor program= matics to your replication forward path. It is at this point where replicat= ion begins that all prograrmmatics cease due to the multi-point nature of r= eplication.=C2=A0 We have a nearly three decades of experience trying to use unicast semantics to describe multi-point forw= arding, and sometimes learning=C2=A0from the past requires leaving it.

=C2=A0

Perhaps others can help me understand what this mean= s. Regardless, what we will do for the time being, in bier wg, is continue = working on gaining bier wg consensus of the requirements, in our draft-ietf= -bier-ipv6-requirements, to help steer the wg toward agreeable solutions.

=

I look forward to further discussions arou= nd reqs. Once we have consensus on reqs, the WG will be open to solutions d= rafts in this space.=C2=A0

Thanks again,
Chairs
(Shep)
=C2=A0

mike

=C2=A0

=C2=A0

Thanks you,

Chairs

--00000000000099c2b005a1106530-- From nobody Tue Mar 17 12:38:04 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EFDC63A0CAF for ; Tue, 17 Mar 2020 12:37:46 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.6 X-Spam-Level: X-Spam-Status: No, score=-9.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EYJY1eJgNqSo for ; Tue, 17 Mar 2020 12:37:45 -0700 (PDT) Received: from aer-iport-2.cisco.com (aer-iport-2.cisco.com [173.38.203.52]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 58FB83A0CA4 for ; Tue, 17 Mar 2020 12:37:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1344; q=dns/txt; s=iport; t=1584473865; x=1585683465; h=mime-version:subject:from:in-reply-to:date:cc: content-transfer-encoding:message-id:references:to; bh=+RDXS0JKOO/hsqpcPf5O3yMsk/fNpZPZspXjVYuOX8M=; b=cch5LilgWR8GIXlE8TXClClS7GZ3gicBuTlN66Y4Peb3DSyJAkQ7dUfO 8j01g5RoXSg+vqnXR4kAYqvIoVtyxKpAbq8SjNphOY18KHCW+mgfRICMM to/KaY0TKbz3NroaWyL9551giUKH5U+/DMnwyrmI8oDp8WVmV6/AP0dPL E=; X-IronPort-AV: E=Sophos;i="5.70,565,1574121600"; d="scan'208";a="24500638" Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 17 Mar 2020 19:37:36 +0000 Received: from ams-iwijnand-88113.cisco.com (ams-iwijnand-88113.cisco.com [10.60.202.94]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTPS id 02HJbags020123 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Tue, 17 Mar 2020 19:37:36 GMT Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) From: IJsbrand Wijnands In-Reply-To: <20200317163800.GA15016@faui48f.informatik.uni-erlangen.de> Date: Tue, 17 Mar 2020 20:37:36 +0100 Cc: IJsbrand Wijnands , Tony Przygienda , "Nagendra Kumar Nainar (naikumar)" , BIER WG Content-Transfer-Encoding: quoted-printable Message-Id: References: <20200312042429.GA12383@faui48f.informatik.uni-erlangen.de> <00788CA2-6F96-4AC5-BEB5-218C94AEC456@cisco.com> <20200312190230.GB17570@faui48f.informatik.uni-erlangen.de> <20200312202909.GC17570@faui48f.informatik.uni-erlangen.de> <20200317163800.GA15016@faui48f.informatik.uni-erlangen.de> To: Toerless Eckert X-Mailer: Apple Mail (2.3445.104.11) X-Outbound-SMTP-Client: 10.60.202.94, ams-iwijnand-88113.cisco.com X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Bier] comments for draft-zhang-bier-bierin6-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Mar 2020 19:38:03 -0000 Toerless, > would be easier to support longer bitstrings as needed. And the length > of bitstrings is not nailed in stone forever like in IPv6, so > different markets could evolve to support different (longer) length. That is true, by overloading the IPv6 address the BM is fixed, but, it = is way in front of the packet, so easy accessible for HW, so there will = be a trade-off between more bits vs. performance penalty for longer = masks. Longer masks will not come for free. > The 256 is really todays lowest common denominator that we can > support in all SP edge/core-routers. >=20 > With IPv6 via bitstrings in addresses (and correct me if you = disagree), > the main attraction was the ability of letting applications do BIER > without having change APIs/host-stacks. That is cool short-term, but Yes. > the long-term benefit deteriorates as soon as someone does write > a BIER SDK for linux and windows. And with that context in mind i > found the long-term limitation of not being able to grow bitstrings > in various markets to be too limiting. We probably need to define what you consider short-term vs. long-term. = Getting IGMPv3 supported in the host stack only took 10 years, is that = long or short term? Thx, Ice. >=20 > Cheers > Toerless >=20 >>=20 >> Thx, >>=20 >> Ice. From nobody Tue Mar 17 13:19:37 2020 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0BF4A3A0D4C for ; Tue, 17 Mar 2020 13:19:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sq2NMqRE2YEZ for ; Tue, 17 Mar 2020 13:19:34 -0700 (PDT) Received: from mail-il1-x134.google.com (mail-il1-x134.google.com [IPv6:2607:f8b0:4864:20::134]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2293A3A0D4B for ; Tue, 17 Mar 2020 13:19:34 -0700 (PDT) Received: by mail-il1-x134.google.com with SMTP id d14so20916503ilq.10 for ; Tue, 17 Mar 2020 13:19:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=IjbwSzN3X0mNyrE2ypmDETmkSFKJHazr2hDbUkLhq3g=; b=NsdVQWRX4xHE2GRhAppuJorLELTSnKsY13qWa20CEks14EV4c+de+1kpv/YjWYIirl EXg4n1W3sLL1aGemJyLUjXAiuSZMDe6FvCZrygtw9REQYbBaT5he3NhFBF58lA3IMuk6 G4ZWJGNQlmVnC+o1AdzJpDLCe97QpaBKouXdt5DDuHbv76LOY4z6AAZEAa5B3poCZ5LG 8PEkxVJS5py7BENBmBtKmCKKJRhedzJ9q8EDOEJIihc+QQ0YZpyYdkFXjcgvBpogBeIY swzd/wMXMQCmDDHxXQHDDjnwDZkfQ06B3UtGXuQPoXbYiZ6EX4GbwJ9puCdmYLb75At/ Xtvw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=IjbwSzN3X0mNyrE2ypmDETmkSFKJHazr2hDbUkLhq3g=; b=VGKGrKUay7qW5LPhrvxdj+Cf1KYANqInamrxpB2mt3Y25cSLX1SZKw9k6wUfkGcpIH XjT/d8dDUxoBOUCvVophru844u2arduopmnwDcBZwXzw+r1zJUsnHyBfSmV0TusYh+4K tvY5FQfrmozdgzkzBXc23EgaK96t+8uxjF6jnsFFlMyq3SgLhKcc5Iy+YhyXe7QrmNKU yeleN811yFyEEzR0gqAfBwoKVsJ0F85ELHzQkTIwL/nCybgqLvgORLhEEjafxqWNxkKV xBHm+pOPrEqT4ymeXEpnuPf7aLzFTKiNgOIwl6Vcv49aOoZ15QaKT87T1jzisr+rswEe mr2Q== X-Gm-Message-State: ANhLgQ3Neuo60CuTjMQgqNd6iTSbueA/3xRcqB02xzC/uucKrtykq3wg 7N3e9Bh6qTmw27CnKYv7+28O0DdDzD8OKAFRjSlP/jbx X-Google-Smtp-Source: ADFU+vt5naGwQ5FkDVUjCi0B/E5LUtJ8eM3+WXBH28Xwx2W0ZK+7O9USCKhp9pvnMflg52HXye28UAGyHR0FKs9G+7I= X-Received: by 2002:a92:7f01:: with SMTP id a1mr673613ild.132.1584476373363; Tue, 17 Mar 2020 13:19:33 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Tony Przygienda Date: Tue, 17 Mar 2020 13:17:52 -0700 Message-ID: To: Greg Shepherd Cc: Michael McBride , BIER WG Content-Type: multipart/alternative; boundary="00000000000063b25105a112a7bc" Archived-At: Subject: Re: [Bier] Direction: draft-xie-bier-ipv6-encapsulation X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Mar 2020 20:19:37 -0000 --00000000000063b25105a112a7bc Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable +1 basically 1st, it is advised for the draft to validate that their assumptions as to packet processing and IPv6 conformance hold, refer to questions raised among others in IETF 105 meeting minutes (if I record correctly). 2nd,yes, we should focus on the requirements document at this point in time state of which leaves a lot to be desired IMO. I will dig out my old comments in next days and let's work on this. --- tony On Tue, Mar 17, 2020 at 10:38 AM Greg Shepherd wrote: > Mike, > > On Tue, Mar 17, 2020 at 9:27 AM Michael McBride < > michael.mcbride@futurewei.com> wrote: > >> Hi Greg, >> >> >> >> *>*To date, there has been insufficient support on the list to adopt the >> draft. >> >> >> >> We won=E2=80=99t know unless we ask the WG. >> >> >> >> >It is the BIER WG position at this time that a review by the 6man WG >> should take place before any further discussion in the BIER WG. >> >> >> >> You mean the bier chairs position. Either way a punt to 6man for bierv6 >> work is fair. We will return and report. >> > > Thanks Mike. Please keep the BIER WG updated on your progress in 6MAN. > > >> >6MAN WG review aside, the draft still raises significant technical >> concerns within the BIER WG. Adding replication information into a >> programmatic header does NOT add replication to programmatic forwarding >> path, nor programmatics to your replication forward path. It is at this >> point where replication begins that all prograrmmatics cease due to the >> multi-point nature of replication. We have a nearly three decades of >> experience trying to use unicast semantics to describe multi-point >> forwarding, and sometimes learning from the past requires leaving it. >> >> >> >> Perhaps others can help me understand what this means. Regardless, what >> we will do for the time being, in bier wg, is continue working on gainin= g >> bier wg consensus of the requirements, in our >> draft-ietf-bier-ipv6-requirements, to help steer the wg toward agreeable >> solutions. >> > > I look forward to further discussions around reqs. Once we have consensus > on reqs, the WG will be open to solutions drafts in this space. > > Thanks again, > Chairs > (Shep) > > >> mike >> >> >> >> >> >> Thanks you, >> >> Chairs >> > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier > --00000000000063b25105a112a7bc Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
+1 basically

1st, it is = advised for the draft to validate that their assumptions as to packet proce= ssing and IPv6 conformance hold, refer to questions raised among others in = IETF 105 meeting minutes (if I record correctly).

=
2nd,yes, we should focus on the requirements document at this point in= time state of which leaves a lot to be desired IMO. I will dig out my old = comments in next days and let's work on this.

=
--- tony

On Tue, Mar 17, 2020 at 10:38 AM Greg Shepherd <gjshep@gmail.com> wr= ote:
Mike,

On Tue, Mar 17, 2020 at 9:27 AM Michael McBride <michael.mcbride= @futurewei.com> wrote:

Hi Greg,

=C2=A0

>To date, there has been insufficient support on the list to a= dopt the draft.

=C2=A0

We won=E2=80=99t know unless we ask the WG.

=C2=A0

>It is the BIER WG position at this time that a rev= iew by the 6man WG should take place before any further discussion in the B= IER WG.

=C2=A0

You mean the bier chairs position. Either way a punt= to 6man for bierv6 work is fair. We will return and report.


Thanks Mike. Plea= se keep the BIER WG updated on your progress in 6MAN.
=C2=A0

>6MAN WG review aside,=C2=A0the draft still raises significant techni= cal concerns within the BIER WG. Adding replication information=C2=A0into a= =C2=A0programmatic=C2=A0header does NOT add replication to=C2=A0programmatic forwarding path, nor program= matics to your replication forward path. It is at this point where replicat= ion begins that all prograrmmatics cease due to the multi-point nature of r= eplication.=C2=A0 We have a nearly three decades of experience trying to use unicast semantics to describe multi-point forw= arding, and sometimes learning=C2=A0from the past requires leaving it.

=C2=A0

Perhaps others can help me understand what this mean= s. Regardless, what we will do for the time being, in bier wg, is continue = working on gaining bier wg consensus of the requirements, in our draft-ietf= -bier-ipv6-requirements, to help steer the wg toward agreeable solutions.

=

I look forward to further discussions arou= nd reqs. Once we have consensus on reqs, the WG will be open to solutions d= rafts in this space.=C2=A0

Thanks again,
Chairs
(Shep)
=C2=A0

mike

=C2=A0

=C2=A0

Thanks you,

Chairs

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