Bit Indexed Explicit Replication
|Document||Proposed charter||Bit Indexed Explicit Replication WG (bier)|
|Title||Bit Indexed Explicit Replication|
|State||Internal review Rechartering|
|IESG||Responsible AD||Alia Atlas|
|Charter Edit AD||Alia Atlas|
On agenda of 2018-02-22 IESG telechat
Has enough positions to pass.
|Send notices to||(None)|
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 introduced in existing multicast networks to shift multicast delivery either end-to-end or in part of a network from mechanisms such as PIM, ng-MVPN, etc. 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. 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. 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. 5) Management models: The WG may work on YANG models and, as needed, management APIs 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. 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. 8) BIER Traffic Engineering: An architecture for BIER-TE is defined in draft-ietf-bier-te-arch; associated fundamental technology is included. 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.
No milestones for charter found.