RFC 8279 on Multicast Using Bit Index Explicit Replication (BIER)

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        RFC 8279

        Title:      Multicast Using Bit Index Explicit 
                    Replication (BIER) 
        Author:     I. Wijnands, Ed.,
                    E. Rosen, Ed.,
                    A. Dolganow,
                    T. Przygienda,
                    S. Aldrin
        Status:     Experimental
        Stream:     IETF
        Date:       November 2017
        Mailbox:    ice@cisco.com,
                    erosen@juniper.net,
                    andrew.dolganow@nokia.com,
                    prz@juniper.net,
                    aldrin.ietf@gmail.com
        Pages:      43
        Characters: 97283
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-bier-architecture-08.txt

        URL:        https://www.rfc-editor.org/info/rfc8279

        DOI:        10.17487/RFC8279

This document specifies a new architecture for the forwarding of
multicast data packets.  It provides optimal forwarding of multicast
packets through a "multicast domain".  However, it does not require a
protocol for explicitly building multicast distribution trees, nor
does it require intermediate nodes to maintain any per-flow state.
This architecture is known as "Bit Index Explicit Replication"
(BIER).  When a multicast data packet enters the domain, the ingress
router determines the set of egress routers to which the packet needs
to be sent.  The ingress router then encapsulates the packet in a
BIER header.  The BIER header contains a bit string in which each bit
represents exactly one egress router in the domain; to forward the
packet to a given set of egress routers, the bits corresponding to
those routers are set in the BIER header.  The procedures for
forwarding a packet based on its BIER header are specified in this
document.  Elimination of the per-flow state and the explicit
tree-building protocols results in a considerable simplification.

This document is a product of the Bit Indexed Explicit Replication Working Group of the IETF.


EXPERIMENTAL: This memo defines an Experimental Protocol for the
Internet community.  It does not specify an Internet standard of any
kind. Discussion and suggestions for improvement are requested.
Distribution of this memo is unlimited.

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