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Transparent Interconnection of Lots of Links (TRILL) Distributed Layer 3 Gateway (RFC7956) Disclosure Number: IPCOM000247442D
Original Publication Date: 2016-Sep-01
Included in the Prior Art Database: 2016-Sep-08
Document File: 56 page(s) / 62K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

W. Hao: AUTHOR [+4]


The TRILL (Transparent Interconnection of Lots of Links) protocol [RFC6325] [RFC7780] provides a solution for least-cost transparent routing in multi-hop networks with arbitrary topologies and link technologies, using IS-IS [IS-IS] [RFC7176] link-state routing and a hop count. TRILL switches are sometimes called RBridges (Routing Bridges).

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Internet Engineering Task Force (IETF)                            W. Hao Request for Comments: 7956                                         Y. Li Category: Standards Track                                         Huawei ISSN: 2070-1721                                                    A. Qu                                                                 MediaTec                                                               M. Durrani                                                             Equinix Inc.                                                           P. Sivamurugan                                                              IP Infusion                                                           September 2016

           Transparent Interconnection of Lots of Links (TRILL)                       Distributed Layer 3 Gateway


   The base TRILL (Transparent Interconnection of Lots of Links)    protocol provides optimal pair-wise data frame forwarding for Layer 2    intra-subnet traffic but not for Layer 3 inter-subnet traffic.  A    centralized gateway solution is typically used for Layer 3 inter-    subnet traffic forwarding but has the following issues:

   1. Sub-optimum forwarding paths for inter-subnet traffic.

   2. A centralized gateway that may need to support a very large number       of gateway interfaces in a Data Center, one per tenant per Data       Label used by that tenant, to provide interconnect functionality       for all the Layer 2 Virtual Networks in a TRILL campus.

   3. A traffic bottleneck at the gateway.

   This document specifies an optional TRILL distributed gateway    solution that resolves these centralized gateway issues.

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

Hao, et al.                  Standards Track                   ...