Deployment Considerations for Lightweight 4over6
draft-ietf-softwire-lightweight-4over6-deployment-01
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Network Working Group Q. Sun
Internet-Draft C. Xie
Intended status: Informational China Telecom
Expires: January 4, 2018 Y. Lee
Comcast
M. Chen
FreeBit
T. Li
Tsinghua University
I. Farrer
Deutsche Telekom AG
July 3, 2017
Deployment Considerations for Lightweight 4over6
draft-ietf-softwire-lightweight-4over6-deployment-01
Abstract
Lightweight 4over6 is a mechanism for providing IPv4 services to
clients connected to a single-stack IPv6 network. The architecture
is similar to DS-Lite, but the network address translation function
is relocated from the tunnel concentrator to the tunnel client, hence
reducing the amount of state which must be maintained in the
concentrator to a per-customer level. This document discusses the
applicability, describes various deployment models and provides
deployment considerations for Lightweight 4over6.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on January 4, 2018.
Sun, et al. Expires January 4, 2018 [Page 1]
Internet-Draft lightweight-4over6-deployment July 2017
Copyright Notice
Copyright (c) 2017 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
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Deployment Models . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Top-Down Deployment Model . . . . . . . . . . . . . . . . 4
2.2. Bottom-Up Deployment Model . . . . . . . . . . . . . . . 5
2.3. Campus Deployment . . . . . . . . . . . . . . . . . . . . 5
3. Overall Deployment Considerations . . . . . . . . . . . . . . 5
3.1. IP Addressing and Routing . . . . . . . . . . . . . . . . 5
3.1.1. IPv4 Routing . . . . . . . . . . . . . . . . . . . . 5
3.1.2. IPv6 Routing . . . . . . . . . . . . . . . . . . . . 6
3.2. lwB4 Configuration . . . . . . . . . . . . . . . . . . . 6
3.2.1. DHCPv6 Based Provisioning . . . . . . . . . . . . . . 6
3.2.2. DHCPv4 over DHCPv6 Based Provisioning . . . . . . . . 7
3.2.3. PCP Based Provisioning . . . . . . . . . . . . . . . 7
3.2.4. NETCONF/YANG Based Provisioning . . . . . . . . . . . 7
3.2.5. Other lwB4 Configuation Considerations . . . . . . . 7
3.3. lwAFTR Discovery . . . . . . . . . . . . . . . . . . . . 8
3.4. Impacts on Accouting . . . . . . . . . . . . . . . . . . 8
4. lwAFTR Deployment Considerations . . . . . . . . . . . . . . 8
4.1. Logging at the lwAFTR . . . . . . . . . . . . . . . . . . 9
4.2. MTU and Fragmentation Considerations . . . . . . . . . . 9
4.3. Reliability Considerations of lwAFTR . . . . . . . . . . 9
4.4. Location of lwAFTRs in the Network . . . . . . . . . . . 10
4.5. Path Consistency Consideration . . . . . . . . . . . . . 10
5. lwB4 Deployment Considerations . . . . . . . . . . . . . . . 11
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