Re: [Bier] BIER rechartering
Xiejingrong <xiejingrong@huawei.com> Thu, 25 January 2018 02:07 UTC
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From: Xiejingrong <xiejingrong@huawei.com>
To: Alia Atlas <akatlas@gmail.com>, "bier@ietf.org" <bier@ietf.org>
Thread-Topic: [Bier] BIER rechartering
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Date: Thu, 25 Jan 2018 02:06:52 +0000
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Subject: Re: [Bier] BIER rechartering
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Alia, Chars : Yesterday I went to wrong place. And today I raise it here again. What I am most concerned about is, weather it is acceptable or not, of related solutions involving tree-building protocols ? I think it is necessary to be clarified explicitly, in this re-charter. Detail comments in-line. Regards. XieJingrong From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Alia Atlas Sent: Wednesday, January 24, 2018 7:12 AM To: bier@ietf.org Subject: [Bier] BIER rechartering As discussed, I have been working with Tony and Greg on the planned rechartering for the BIER WG. You can find this version at: https://datatracker.ietf.org/doc/charter-ietf-bier/. Please send comments. I want this to make the February 8 IESG telechat. ================================ The BIER (Bit Index Explicit Replication) Working Group has defined an architecture [RFC 8279] for multicast forwarding that uses an encapsulation [RFC 8296] that can be used on MPLS or Ethernet transport. The BIER-WG is now chartered to produce Standards Track RFCs and to update or do a Status Change for those RFCs previously published as Experimental (RFC 8279, RFC 8296, etc.). First and primarily, the BIER-WG will complete its work on: 1) Transition Mechanisms: The WG will describe how BIER can be partially deployed and still provide useful functionality. A minimum of the necessary mechanisms to support incremental deployment and/or managing different BIER mask-length compatibility may be defined. Operation of BIER in non-congruent topologies, i.e. topologies where not all routers are BIER capable can also be addressed. In addition to tunneling solutions, other approaches to make BIER deployable in such environments can be worked on. Each such mechanism must include an applicability statement to differentiate its necessity from other proposed mechanisms. [XJR1]: I think P2MP based BIER can naturally work as an alternative partially deploy solution also. But unfortunately it involve tree-building protocol. Acceptable or not ? 2) Applicability Statements: The WG will describe how BIER can be applied to multicast L3VPN and to EVPN. This draft will describe what mechanism is used to communicate the group membership between the ingress router and the egress routers, what scalability considerations may arise, and any deployment considerations. The WG will work on additional applicability statements, as needed, describing how BIER can be applied. [XJR2]: MVPN using P2MP-based BIER, is also one way of apply BIER in MVPN. Acceptable or not ? 3) Use Case: The WG may produce one use-case document that clearly articulates the potential benefits of BIER for different use-cases. 4) Manageability and OAM: The WG will describe how OAM will work in a BIER domain and what simplifications BIER offers for managing the multicast traffic. A strong preference will be given to extensions to existing protocols. [XJR3]: P2MP-based BIER can use exist P2MP PMTU. It will be helpful. Acceptable or not ? 5) Management models: The WG may work on YANG models and, if needed, MIB modules to support common manageability. 6) IGP extensions. When a BIER domain falls within a "link state IGP" network, the information needed to set up the BIER forwarding tables (e.g., the mapping between a given bit position and a given egress router) may be carried in the link state advertisements of the IGP. The link state advertisements may also carry other information related to forwarding (e.g., the IGP may support multiple topologies, in which case it may be necessary to advertise which topologies are to be used for BIER forwarding). Any necessary extensions to the IGP will be specified by the WG as Standards Track, in cooperation with the LSR WG. [XJR4]: How about BGP extensions as BIER underlay ? and how about RSVP-TE/MLDP extensions as BIER underlay ? The BIER-WG is additionally chartered to start Standards Track work on: 7) BIER in IPv6 : A mechanism to use BIER natively in IPv6 may be standardized if coordinated with the 6MAN WG and with understood applicability. Such functionality may focus on assuming software or slow-path support first. 8) BIER Traffic Engineering: An architecture for BIER-TE is defined in draft-ietf-bier-te-arch; associated fundamental technology is included. [XJR5] Thanks for acceptance of this topic in the re-charter. I think it is a necessary puzzle, and P2MP-based BIER can also provide an alternative TE through transport mechanism. Acceptable or not ? 9) Extensions to support BIER in multi-area IGP Deployments The BIER-WG is chartered to investigate the following topics. The adoption of any Standards Track drafts will require a milestone approved by the responsible Area Director. 10) Novel uses of the BIER bitmap: There are a variety of proposals for additional algorithms and other uses of the BIER bitmap and encapsulation beyond BIER and BIER-TE. 11) BIER between Autonomous Domains: With understood applicability, these scenarios may be investigated. 12) Use of BIER in Controller-based Architectures: How might controllers be used to provide calculated BIRTs and/or BIFTs tables to BFRs? 13) Applicability of BIER to Applications: The WG may advise on the applicability of BIER to various applications. The BIER-WG will coordinate with several different working groups and must include the relevant other working groups during working group last call on the relevant drafts. BIER-WG will coordinate with MPLS-WG on the associated MPLS-based OAM mechanisms. BIER-WG will coordinate with LSR-WG on extensions to flood BIER-related information. BIER-WG will advise BABEL-WG on Babel extensions to support BIER. BIER-WG will coordinate with BESS-WG and IDR-WG on the applicability of existing BGP-based mechanisms for providing multicast group membership information. BIER-WG will coordinate with PIM-WG on the applicability of and extensions to PIM, IGMP, and MLD to support BIER operations and transition; BIER-WG will work directly on the applicability statements, as needed. ================================= Thanks, Alia
- [Bier] BIER rechartering Alia Atlas
- Re: [Bier] BIER rechartering Dolganow, Andrew (Nokia - SG/Singapore)
- Re: [Bier] BIER rechartering Tony Przygienda
- [Bier] 回复: BIER rechartering 徐小虎(义先)
- Re: [Bier] 回复: BIER rechartering Tony Przygienda
- [Bier] 回复: 回复: BIER rechartering 徐小虎(义先)
- Re: [Bier] 回复: BIER rechartering Tony Przygienda
- Re: [Bier] 回复: BIER rechartering Tony Przygienda
- Re: [Bier] BIER rechartering Dolganow, Andrew (Nokia - SG/Singapore)
- Re: [Bier] BIER rechartering Jeff Tantsura
- Re: [Bier] BIER rechartering Tony Przygienda
- Re: [Bier] BIER rechartering Dolganow, Andrew (Nokia - SG/Singapore)
- Re: [Bier] BIER rechartering Xiejingrong
- Re: [Bier] BIER rechartering Xiejingrong
- Re: [Bier] BIER rechartering Xiejingrong
- Re: [Bier] BIER rechartering Dolganow, Andrew (Nokia - SG/Singapore)
- Re: [Bier] BIER rechartering Xiejingrong
- Re: [Bier] BIER rechartering Alia Atlas
- Re: [Bier] BIER rechartering Dolganow, Andrew (Nokia - SG/Singapore)
- Re: [Bier] BIER rechartering Tony Przygienda
- Re: [Bier] BIER rechartering Xiejingrong
- Re: [Bier] BIER rechartering Xiejingrong
- Re: [Bier] BIER rechartering Purkayastha, Debashish
- Re: [Bier] BIER rechartering Alia Atlas