The IETF TRILL (TRansparent Interconnection of Lots of Links) standard
provides least cost pair-wise data forwarding without configuration in
multi-hop networks with arbitrary topology, safe forwarding even
during periods of temporary loops, and support for multipathing of
both unicast and multicast traffic. TRILL accomplishes this by using
IS-IS (Intermediate System to Intermediate System) link state routing
and by encapsulating traffic using a header that includes a hop count.
Since the TRILL base protocol was approved in March 2010, active
development of TRILL has revealed a few errata in the original RFC
6325 and some cases that could use clarifications or updates. RFCs
6327, RFC 6439, and RFC XXXX, provide clarifications with respect to
Adjacency, Appointed Forwarders, and the TRILL ESADI protocol. This
document provide other known clarifications, corrections, and updates
to RFCs 6325, 6327, and 6439.