Internet Engineering Task Force (IETF) A. Sajassi
Request for Comments: 7209 Cisco
Category: Informational R. Aggarwal
ISSN: 2070-1721 Arktan
J. Uttaro
AT&T
N. Bitar
Verizon
W. Henderickx
Alcatel-Lucent
A. Isaac
Bloomberg
May 2014
Requirements for Ethernet VPN (EVPN)
Abstract
The widespread adoption of Ethernet L2VPN services and the advent of
new applications for the technology (e.g., data center interconnect)
have culminated in a new set of requirements that are not readily
addressable by the current Virtual Private LAN Service (VPLS)
solution. In particular, multihoming with all-active forwarding is
not supported, and there's no existing solution to leverage
Multipoint-to-Multipoint (MP2MP) Label Switched Paths (LSPs) for
optimizing the delivery of multi-destination frames. Furthermore,
the provisioning of VPLS, even in the context of BGP-based auto-
discovery, requires network operators to specify various network
parameters on top of the access configuration. This document
specifies the requirements for an Ethernet VPN (EVPN) solution, which
addresses the above issues.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
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). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see 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/rfc7209.
Sajassi, et al. Informational [Page 1]RFC 7209 Requirements for Ethernet VPN May 2014Copyright Notice
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Table of Contents
1. Introduction ....................................................3
2. Specification of Requirements ...................................4
3. Terminology .....................................................4
4. Redundancy Requirements .........................................5
4.1. Flow-Based Load Balancing ..................................5
4.2. Flow-Based Multipathing ....................................6
4.3. Geo-redundant PE Nodes .....................................7
4.4. Optimal Traffic Forwarding .................................7
4.5. Support for Flexible Redundancy Grouping ...................8
4.6. Multihomed Network .........................................8
5. Multicast Optimization Requirements .............................9
6. Ease of Provisioning Requirements ...............................9
7. New Service Interface Requirements .............................10
8. Fast Convergence ...............................................12
9. Flood Suppression ..............................................12
10. Supporting Flexible VPN Topologies and Policies ...............12
11. Security Considerations .......................................13
12. Normative References ..........................................13
13. Informative References ........................................14
14. Contributors ..................................................15
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