Transparent Interconnection of Lots of Links (TRILL) Active-Active Edge Using Multiple MAC Attachments
RFC 7782
Internet Engineering Task Force (IETF) M. Zhang
Request for Comments: 7782 Huawei
Category: Standards Track R. Perlman
ISSN: 2070-1721 EMC
H. Zhai
Astute Technology
M. Durrani
Cisco Systems
S. Gupta
IP Infusion
February 2016
Transparent Interconnection of Lots of Links (TRILL)
Active-Active Edge Using Multiple MAC Attachments
Abstract
TRILL (Transparent Interconnection of Lots of Links) active-active
service provides end stations with flow-level load balance and
resilience against link failures at the edge of TRILL campuses, as
described in RFC 7379.
This document specifies a method by which member RBridges (also
referred to as Routing Bridges or TRILL switches) in an active-active
edge RBridge group use their own nicknames as ingress RBridge
nicknames to encapsulate frames from attached end systems. Thus,
remote edge RBridges (who are not in the group) will see one host
Media Access Control (MAC) address being associated with the multiple
RBridges in the group. Such remote edge RBridges are required to
maintain all those associations (i.e., MAC attachments) and to not
flip-flop among them (as would occur prior to the implementation of
this specification). The design goals of this specification are
discussed herein.
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/rfc7782.
Zhang, et al. Standards Track [Page 1]
RFC 7782 Multi-Attach for Active-Active Edge February 2016
Copyright Notice
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Table of Contents
1. Introduction ....................................................3
2. Acronyms and Terminology ........................................4
3. Overview ........................................................5
4. Incremental Deployable Options ..................................6
4.1. Details of Option B ........................................7
4.1.1. Advertising Data Labels for Active-Active Edge ......7
4.1.2. Discovery of Active-Active Edge Members .............8
4.1.3. Advertising Learned MAC Addresses ...................9
4.2. Extended RBridge Capability Flags APPsub-TLV ..............11
5. Meeting the Design Goals .......................................12
5.1. No MAC Address Flip-Flopping (Normal Unicast Egress) ......12
5.2. Regular Unicast/Multicast Ingress .........................12
5.3. Correct Multicast Egress ..................................12
5.3.1. No Duplication (Single Exit Point) .................12
5.3.2. No Echo (Split Horizon) ............................13
5.4. No Black-Hole or Triangular Forwarding ....................14
5.5. Load Balance towards the AAE ..............................14
5.6. Scalability ...............................................14
6. E-L1FS Backward Compatibility ..................................15
7. Security Considerations ........................................15
8. IANA Considerations ............................................16
8.1. TRILL APPsub-TLVs .........................................16
8.2. Extended RBridge Capabilities Registry ....................16
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