The IETF TRILL (Transparent Interconnection of Lots of Links)
protocol provides optimal pair-wise data frame forwarding without
configuration in multi-hop networks with arbitrary topology and link
technology, and support for multipathing of both unicast and
multicast traffic. This document specifies the data formats and code
points for the IS-IS extensions to support TRILL. These data formats
and code points may also be used by technologies other than TRILL.
This document obsoletes RFC 6326.