Address Resolution Protocol (ARP) Mediation for IP Interworking of Layer 2 VPNs
RFC 6575
Document | Type | RFC - Proposed Standard (June 2012; No errata) | |
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Authors | Himanshu Shah , Giles Heron , Vach Kompella , Eric Rosen | ||
Last updated | 2015-10-14 | ||
Stream | Internent Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Reviews | |||
Stream | WG state | WG Document | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6575 (Proposed Standard) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Stewart Bryant | ||
IESG note | Document Shepherd: Nabil Bitar, nabil.n.bitar@verizon.com | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) H. Shah, Ed. Request for Comments: 6575 Ciena Category: Standards Track E. Rosen, Ed. ISSN: 2070-1721 G. Heron, Ed. Cisco V. Kompella, Ed. Alcatel-Lucent June 2012 Address Resolution Protocol (ARP) Mediation for IP Interworking of Layer 2 VPNs Abstract The Virtual Private Wire Service (VPWS), detailed in RFC 4664, provides point-to-point connections between pairs of Customer Edge (CE) devices. It does so by binding two Attachment Circuits (each connecting a CE device with a Provider Edge (PE) device) to a pseudowire (connecting the two PEs). In general, the Attachment Circuits must be of the same technology (e.g., both Ethernet or both ATM), and the pseudowire must carry the frames of that technology. However, if it is known that the frames' payload consists solely of IP datagrams, it is possible to provide a point-to-point connection in which the pseudowire connects Attachment Circuits of different technologies. This requires the PEs to perform a function known as "Address Resolution Protocol (ARP) Mediation". ARP Mediation refers to the process of resolving Layer 2 addresses when different resolution protocols are used on either Attachment Circuit. The methods described in this document are applicable even when the CEs run a routing protocol between them, as long as the routing protocol runs over IP. 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/rfc6575. Shah, et al. Standards Track [Page 1] RFC 6575 ARP Mediation for IP Interworking of L2VPNs June 2012 Copyright Notice Copyright (c) 2012 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 ....................................................3 1.1. Conventions Used in This Document ..........................4 2. ARP Mediation (AM) Function .....................................5 3. IP Layer 2 Interworking Circuit .................................6 4. IP Address Discovery Mechanisms .................................6 4.1. Discovery of IP Addresses of Locally Attached IPv4 CE ......7 4.1.1. Monitoring Local Traffic ............................7 4.1.2. CE Devices Using ARP ................................7 4.1.3. CE Devices Using Inverse ARP ........................8 4.1.4. CE Devices Using PPP ................................9 4.1.5. Router Discovery Method ............................10 4.1.6. Manual Configuration ...............................10 4.2. How a CE Learns the IPv4 Address of a Remote CE ...........10 4.2.1. CE Devices Using ARP ...............................11 4.2.2. CE Devices Using Inverse ARP .......................11 4.2.3. CE Devices Using PPP ...............................11 4.3. Discovery of IP Addresses of IPv6 CE Devices ..............11 4.3.1. Distinguishing Factors between IPv4 and IPv6 .......11 4.3.2. Requirements for PEs ...............................12 4.3.3. Processing of Neighbor Solicitations ...............12 4.3.4. Processing of Neighbor Advertisements ..............13 4.3.5. Processing Inverse Neighbor Solicitations (INSs) ...14 4.3.6. Processing of Inverse Neighbor Advertisements (INAs) ..............................15Show full document text