Routing Bridges (RBridges): Adjacency
RFC 6327
Document | Type |
RFC - Proposed Standard
(July 2011; No errata)
Obsoleted by RFC 7177
Updated by RFC 7180
Updates RFC 6325
Was draft-ietf-trill-adj (trill WG)
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Last updated | 2015-10-14 | ||
Stream | IETF | ||
Formats | plain text pdf html bibtex | ||
Reviews | |||
Stream | WG state | WG Document | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6327 (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) D. Eastlake 3rd Request for Comments: 6327 Huawei Updates: 6325 R. Perlman Category: Standards Track Intel Labs ISSN: 2070-1721 A. Ghanwani Brocade D. Dutt Cisco Systems V. Manral Hewlett Packard Co. July 2011 Routing Bridges (RBridges): Adjacency Abstract The IETF TRILL (TRansparent Interconnection of Lots of Links) protocol provides optimal pair-wise data forwarding without configuration, 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 Routing Bridges (RBridges). TRILL supports multi-access LAN (Local Area Network) links that can have multiple end stations and RBridges attached. This document describes four aspects of the TRILL LAN Hello protocol used on such links, particularly adjacency, designated RBridge selection, and MTU (Maximum Transmission Unit) and pseudonode procedures, with state machines. There is no change for IS-IS point-to-point Hellos used on links configured as point-to-point in TRILL. 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/rfc6327. Perlman, et al. Standards Track [Page 1] RFC 6327 RBridges: Adjacency July 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. Perlman, et al. Standards Track [Page 2] RFC 6327 RBridges: Adjacency July 2011 Table of Contents 1. Introduction ....................................................4 1.1. Content and Precedence .....................................4 1.2. Terminology and Acronyms ...................................5 2. The TRILL Hello Environment and Purposes ........................5 2.1. Incrementally Replacing 802.1Q-2005 Bridges ................5 2.2. Handling Native Frames .....................................6 2.3. Zero or Minimal Configuration ..............................7 2.4. MTU Robustness .............................................7 2.5. Purposes of the TRILL Hello Protocol .......................8 3. Adjacency State Machinery .......................................9 3.1. TRILL LAN Hellos, MTU Test, and VLANs ......................9 3.2. Adjacency Table Entries and States ........................10 3.3. Adjacency and Hello Events ................................11 3.4. Adjacency State Diagram and Table .........................13 3.5. Multiple Parallel Links ...................................14 3.6. Insufficient Space in Adjacency Table .....................15 4. RBridge LAN Ports and DRB State ................................15 4.1. Port Table Entries and DRB Election State .................16 4.2. DRB Election Events .......................................16 4.2.1. DRB Election Details ...............................17 4.2.2. Change in DRB ......................................18Show full document text