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Transparent Interconnection of Lots of Links (TRILL): Appointed Forwarders (RFC8139) Disclosure Number: IPCOM000250186D
Original Publication Date: 2017-Jun-01
Included in the Prior Art Database: 2017-Jun-10
Document File: 82 page(s) / 95K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Eastlake 3rd: AUTHOR [+4]


The IETF TRILL (Transparent Interconnection of Lots of Links) protocol [RFC6325] [RFC7780] provides optimal pairwise data frame forwarding without configuration in multi-hop networks with arbitrary topology and link technology, safe forwarding even during periods of temporary loops, and support for multipathing of both unicast and multicast traffic. TRILL accomplishes these by using IS-IS (Intermediate System to Intermediate System) [IS-IS] [RFC7176] link-state routing and encapsulating traffic using a header that includes a hop count. The design supports VLANs, FGLs (Fine-Grained Labels) [RFC7172], and optimization of the distribution of multi-destination frames based on VLANs and multicast groups. Devices that implement TRILL are called TRILL switches or "RBridges" (Routing Bridges).

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Internet Engineering Task Force (IETF)                   D. Eastlake 3rd Request for Comments: 8139                                         Y. Li Obsoletes: 6439                                                   Huawei Updates: 6325, 7177                                             M. Umair Category: Standards Track                                    IP Infusion ISSN: 2070-1721                                              A. Banerjee                                                                    Cisco                                                                    F. Hu                                                                      ZTE                                                                June 2017

          Transparent Interconnection of Lots of Links (TRILL):                           Appointed Forwarders


   TRILL (Transparent Interconnection of Lots of Links) supports multi-    access LAN (Local Area Network) links where a single link can have    multiple end stations and TRILL switches attached.  Where multiple    TRILL switches are attached to a link, native traffic to and from end    stations on that link is handled by a subset of those TRILL switches    called "Appointed Forwarders" as originally specified in RFC 6325,    with the intent that native traffic in each VLAN be handled by at    most one TRILL switch.  This document clarifies and updates the    Appointed Forwarder mechanism.  It updates RFCs 6325 and 7177 and    obsoletes RFC 6439.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

 Eastlake, et al.             Standards Track                    [Page 1]
 RFC 8139               TRILL: Appointed Forwarders             June 2017

 Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the    document authors....