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Toerless Eckert, Michael Menth, Gregory Cauchie
This memo describes per-packet stateless strict and loose path
steered replication and forwarding for "Bit Index Explicit Replication" (BIER) packets (RFC 8279); it is called "Tree Engineering for Bit Index Explicit Replication" (BIER-TE) and is intended to be used as the path steering mechanism for Traffic Engineering
with BIER.
BIER-TE introduces a new semantic for "bit positions" (BPs). These BPs indicate adjacencies
of the network topology, as opposed to (non-TE) BIER in which BPs indicate
"Bit-Forwarding Egress Routers" (BFERs). A BIER-TE "packets BitString" therefore indicates the
edges of the (loop-free) tree across which the packets are forwarded by BIER-TE.
BIER-TE can leverage BIER forwarding engines with little changes.
Co-existence of BIER and BIER-TE forwarding in the same domain is possible -- for example, by using
separate BIER "subdomains" (SDs). Except for the optional routed adjacencies, BIER-TE does not
require a BIER routing underlay and can therefore operate without depending
on a routing protocol such as the "Interior Gateway Protocol" (IGP).
RFC 9262: Tree Engineering for Bit Index Explicit Replication (BIER-TE)
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