Routing Aspects of IPv6 Transition (RFC2185)
Original Publication Date: 1997-Sep-01
Included in the Prior Art Database: 2019-Feb-15
Internet Society Requests For Comment (RFCs)
R. Callon: AUTHOR [+1]
This document gives an overview of the routing aspects of the IPv6 transition. It is based on the protocols defined in the document "Transition Mechanisms for IPv6 Hosts and Routers." Readers should be familiar with the transition mechanisms before reading this document. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.
Network Working Group R. Callon Request for Comments: 2185 Cascade Communications Co. Category: Informational D. Haskin Bay Networks Inc. September 1997
Routing Aspects Of IPv6 Transition
Status of this memo
This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind. Distribution of this memo is unlimited.
This document gives an overview of the routing aspects of the IPv6 transition. It is based on the protocols defined in the document "Transition Mechanisms for IPv6 Hosts and Routers" . Readers should be familiar with the transition mechanisms before reading this document.
The proposals contained in this document are based on the work of the Ngtrans working group.
This paper uses the following terminology:
node - a protocol module that implements IPv4 or IPv6.
router - a node that forwards packets not explicitly addressed to itself.
host - any node that is not a router.
border router - a router that forwards packets across routing domain boundaries.
link - a communication facility or medium over which nodes can communicate at the link layer, i.e., the layer immediately below internet layer.
interface - a node’s attachment to a link.
address - an network layer identifier for an interface or a group of interfaces.
Callon & Haskin Informational [Page 1]
RFC 2185 Routing Aspects Of IPv6 Transition September 1997
neighbors - nodes attached to the same link.
routing domain - a collection of routers which coordinate routing knowledge using a single routing protocol.
routing region (or just "region") - a collection of routers interconnected by a single internet protocol (e.g. IPv6) and coordinating their routing knowledge using routing protocols from a single internet protocol stack. A routing region may be a superset of a routing domain.
tunneling - encapsulation of protocol A within protocol B, such that A treats B as though it were a datalink layer.
reachability information - information describing the set of reachable destinations that can be used for packet forwarding decisions.
routing information - same as reachability information.
address prefix - the high-order bits in an address.
routing prefix - address prefix that expresses destinations which have addresses with the matching address prefixes. It is used by routers to advertise what systems they are capable of reaching.
route leaking - advertisement of network layer reachability information across routing region boundaries.
2. ISSUES AND OUTLINE
This document gives an overview of the routing aspects of IPv4 to IPv6 transition. The approach outlined here is designed to be compatible with the existing mechanisms for IPv6 transition .
During an extended IPv4-to-IPv6 transition period, IPv6-based systems must coexist with the installed base of IPv4 systems. In such a dual internetworking protocol environment, both IPv4 and IPv6 routing infrastructure will be present. Initially, deployed IPv6-capable doma...