Carrier-Grade NAT (CGN) Deployment with BGP/MPLS IP VPNs (RFC7289)
Original Publication Date: 2014-Jun-01
Included in the Prior Art Database: 2014-Jun-27
Internet Society Requests For Comment (RFCs)
V. Kuarsingh: AUTHOR [+3]
Operators are faced with near-term IPv4 address-exhaustion challenges. Many operators may not have a sufficient amount of IPv4 addresses in the future to satisfy the needs of their growing subscriber base. This challenge may also be present before or during an active transition to IPv6, somewhat complicating the overall problem space.
Internet Engineering Task Force (IETF) V. Kuarsingh, Ed. Request for Comments: 7289 J. Cianfarani Category: Informational Rogers Communications ISSN: 2070-1721 June 2014
Carrier-Grade NAT (CGN) Deployment with BGP/MPLS IP VPNs
This document specifies a framework to integrate a Network Address
Translation (NAT) layer into an operator's network to function as a
Carrier-Grade NAT (also known as CGN or Large-Scale NAT). The CGN
infrastructure will often form a NAT444 environment as the subscriber
home network will likely also maintain a subscriber-side NAT
function. Exhaustion of the IPv4 address pool is a major driver
compelling some operators to implement CGN. Although operators may
wish to deploy IPv6 to strategically overcome IPv4 exhaustion, near-
term needs may not be satisfied with an IPv6 deployment alone. This
document provides a practical integration model that allows the CGN
platform to be integrated into the network, meeting the connectivity
needs of the subscriber while being mindful of not disrupting
existing services and meeting the technical challenges that CGN
brings. The model included in this document utilizes BGP/MPLS IP
VPNs, which allow for virtual routing separation, helping ease the
CGN's impact on the network. This document does not intend to defend
the merits of CGN.
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/rfc7289.
Kuarsingh & Cianfarani Informational [Page 1]
RFC 7289 CGN Deployment with BGP/MPLS IP VPNs June 2014
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