Routing Bridges (RBridges): Appointed Forwarders
RFC 6439
Document | Type |
RFC - Proposed Standard
(November 2011; No errata)
Obsoleted by RFC 8139
Updated by RFC 7180
Updates RFC 6325
|
|
---|---|---|---|
Last updated | 2018-12-20 | ||
Replaces | draft-perlman-trill-rbridge-af | ||
Stream | IETF | ||
Formats | plain text pdf html bibtex | ||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6439 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Ralph Droms | ||
IESG note | Erik Nordmark (nordmark@acm.org) is the document shepherd. | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) R. Perlman Request for Comments: 6439 Intel Labs Updates: 6325 D. Eastlake 3rd Category: Standards Track Y. Li ISSN: 2070-1721 Huawei Technologies A. Banerjee Cisco Systems F. Hu ZTE Corporation November 2011 Routing Bridges (RBridges): Appointed Forwarders Abstract 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. Devices that implement TRILL are called "RBridges" (Routing Bridges). TRILL supports multi-access LAN (Local Area Network) links that can have multiple end stations and RBridges attached. Where multiple RBridges are attached to a link, native traffic to and from end stations on that link is handled by a subset of those RBridges called "Appointed Forwarders", with the intent that native traffic in each VLAN (Virtual LAN) be handled by at most one RBridge. The purpose of this document is to improve the documentation of the Appointed Forwarder mechanism; thus, it updates RFC 6325. 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 5741. 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/rfc6439. Perlman, et al. Standards Track [Page 1] RFC 6439 RBridges: Appointed Forwarders November 2011 Copyright Notice Copyright (c) 2011 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction ....................................................2 1.1. Terminology and Acronyms ...................................3 2. Appointed Forwarders and Their Appointment ......................4 2.1. Appointment Effects of DRB Elections .......................5 2.2. Appointment and Removal by the DRB .........................5 2.2.1. Processing Forwarder Appointments ...................6 2.2.2. Frequency of Appointments ...........................7 2.2.3. Appointed Forwarders Limit ..........................8 2.3. Local Configuration Action Appointment Effects .............8 2.4. VLAN Mapping within a Link .................................9 3. The Inhibition Mechanism ........................................9 4. Inhibited Appointed Forwarder Behavior .........................11 5. Multiple Ports on the Same Link ................................12 6. Security Considerations ........................................12 7. Acknowledgements ...............................................13 8. References .....................................................13 8.1. Normative References ......................................13 8.2. Informative References ....................................13 Appendix. VLAN Inhibition Example .................................14 1. Introduction The IETF TRILL (TRansparent Interconnection of Lots of Links) protocol [RFC6325] provides optimal pair-wise data frame forwarding without configuration in multi-hop networks with arbitrary topology, safe forwarding even during periods of temporary loops, and supportShow full document text