diff --git a/draft-ietf-softwire-map-deployment.xml b/draft-ietf-softwire-map-deployment.xml index df68b1b..6d4fa78 100644 --- a/draft-ietf-softwire-map-deployment.xml +++ b/draft-ietf-softwire-map-deployment.xml @@ -158,8 +158,8 @@ This document describes when and how an operator uses the technique of - Mapping of Address and Port (MAP) for the IPv4 residual - deployment in the IPv6-dominant domain. + Mapping of Address and Port (MAP) for IPv4 residual + deployment in an IPv6-dominant domain. @@ -171,7 +171,7 @@ IPv4 address exhaustion has become world-wide reality and the primary solution in the industry is to deploy IPv6-only networking. Meanwhile, having access to legacy IPv4 contents and services is a long-term - requirement, will be so until the completion of the IPv6 transition. It + requirement, and will be so until the completion of the IPv6 transition. It demands sharing residual IPv4 address pools for IPv4 communications across the IPv6-only domain(s). @@ -187,28 +187,24 @@ Residual deployment with MAP is new to most operators. This document is motivated to provide basic understanding on the usage of MAP, i.e., - when and how an operator can do with MAP to meet its own operational - requirements of IPv6 transition and its facility conditions, in the - phase of IPv4 residual deployment. Potential readers of this document + when and how an operator can deploy MAP to meet its own operational + requirements for IPv6 transition given its facility conditions, during the + IPv4 residual deployment phase. Potential readers of this document are those who want to know: - What are the requirements of MAP deployment ? + What are the requirements of MAP deployment? - What technical options needs to be considered when deploying MAP, - and how? + What technical options need to be considered when deploying MAP, + and how can they be applied? How does MAP impact on the address planning for both IPv6 and IPv4 pools? How does MAP impact on daily network operations and - administrations? + administration? - How do we migrate to IPv6-only network with the help of MAP? + How do we migrate to an IPv6-only network with the help of MAP? - Terminology of this document, unless it is intentionally specified, - follows the definitions and abbreviations of . - Unless it is specifically specified, the deployment considerations and guidance proposed in this document are also applied to MAP-T , the translation @@ -235,29 +231,51 @@ - +
+ + The terminology of this document, unless otherwise specified, + follows the definitions and abbreviations of . In particular, this document uses + the following terms and abbreviations: + + MAP Customer Edge. + MAP Border Relay. + Basic Mapping Rule. + Forwarding Mapping Rule. + Port set identifier. + Embedded Address (bits). + + In addition, the term "End-user IPv6 prefix" is used as defined in that + document. + + + +
MAP can be deployed for large-scale carrier networks. There are typically two network models for broadband access service: - one is to use PPPoE/PPPoA authentication method while the other is to use IPoE. - The first one is usually applied to Residential network and SOHO networks. - Subscribers in CPNs can access broadband network by PPP dial-up authentication. - BRAS is the key network element which takes full responsibility of IP address - assignment, user authentication, traffic aggregation, PPP session termination, - etc. Then IP traffic is forwarded to Core Routers through Metro Area Network, - and finally transited to Internet via Backbone network. The second network - scenario is usually applied to large enterprise networks. Subscribers in CPNs - can access broadband network by IPoE authentication. IP address is normally - assigned by DHCP server, or static configuration. -In either case, a CPE could obtain a prefix via prefix delegation procedure, - and the hosts behind CPE would get its own IPv6 addresses within the prefix - through SLAAC or DHCPv6 statefully. A MAP CE would also obtain a set of MAP - rules from DHCPv6 server. + one is to use the PPP over Ethernet or ATM authentication method while the + other is to use IP over Ethernet (IPoE) [reference?]. PPP is usually applied to residential and + small office, home office (SOHO) networks. Subscribers in customer networks + can access the broadband network by PPP dial-up authentication. + The Broadband Remote Access Server (BRAS) is a key network element that + takes full responsibility for IP address assignment, user authentication, + traffic aggregation, PPP session termination, etc. Subsequent IP traffic + is forwarded to Core Routers through a Metro Area Network, + and finally transited to the Internet via the Backbone network. + + The second network + scenario is usually applied to large enterprise networks. Subscribers in these customer networkss + can access the broadband network by IPoE authentication. The IP address is normally + assigned by DHCP server, or by static configuration. + + In either case, a CPE could obtain a prefix via the prefix delegation procedure. + A CPE that is a MAP CE would also obtain a set of MAP + rules from DHCPv6 server. The hosts behind the CPE would get their own IPv6 addresses + within the delegated prefix through Stateless Address Autoconfiguration (SLAAC) or stateful DHCPv6. depicts a generic model of stateless IPv4-over-IPv6 communication for broadband access services.