The IETF TRILL (TRansparent Interconnection of Lots of Links)
protocol 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.
RFC 6327 and RFC 6439 provide clarifications and updates with respect
to Adjacency and Appointed Forwarders. This document provide other
known clarifications, corrections, and updates to RFC 6325, RFC 6327,
and RFC 6439.
The clarifications, corrections, and updates cover many areas, but
substantial ones are in the areas of:
- Overloaded and/or Unreachable RBridges
- Distribution Trees
- Nickname selection
- Maximum Transmission Unit
Note that one change in this document (section 3.4) is not backward
compatible with [RFC6325] but has nevertheless been adopted to reduce
distribution tree changes resulting from topology changes.
Working Group Summary
There was consensus in the working group in favor of the document.
The document has been carefully reviewed in the WG and by the document
The document was forwarded to the IS-IS WG mailing list, which
resulted in some additional improvements.
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