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VA-Based IPv6 Transition

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Yong Cui , Shengling Wang , Mingwei Xu , Jianping Wu , Xing Li
Last updated 2009-05-22
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


With the increasing deployment of IPv6 networks, IPv6 transition has become one of the key problems in developing IPv6 networks. Among various transition scenarios, one is common where connectivity between IPv4 networks is desired across IPv6-only backbone network. In such case, ISP operating the IPv6 backbone will accommodate connectivity and offer transit services for attached IPv4 networks. Softwire WG defined softwire mesh mechanism for both of the IPv4- over-IPv6 scenario and the opposite scenario of IPv6-over-IPv4. Softwire mesh uses automatic softwire tunnels employing multi- protocol BGP extensions for distributing IPv4 routes, where BGP and tunnuls should be configured or setup as a full-mesh architecture. This draft, however, proposed an aggregated, centralized mechanism similar to Virtual Aggregation (VA) mechanism, which can significantly shrink the forwarding information base (FIB) size of Address Family Border Routers (AFBRs), reduce the total amount of routing activity, and provide the IPv6 ISP with an easy way to manage the transit service.


Yong Cui
Shengling Wang
Mingwei Xu
Jianping Wu
Xing Li

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)