Transparent Interconnection of Lots of Links (TRILL): Appointed Forwarders (RFC8139)
Original Publication Date: 2017-Jun-01
Included in the Prior Art Database: 2017-Jun-10
Internet Society Requests For Comment (RFCs)
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).
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 http://www.rfc-editor.org/info/rfc8139.
Eastlake, et al. Standards Track [Page 1]
RFC 8139 TRILL: Appointed Forwarders June 2017
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