dna S. Yamamoto
Internet-Draft C. Williams
Expires: August 9, 2004 KDDI Labs USA
G. Daley
Monash University CTIE
M. Parthasarathy
February 9, 2004
Detecting Network Attachment Terminology
draft-yamamoto-dna-term-00.txt
Status of this Memo
This document is an Internet-Draft and is in full conformance with
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Copyright Notice
Copyright (C) The Internet Society (2004). All Rights Reserved.
Abstract
The DNA working group is working on solutions for hosts to detect
their IP layer connectivity and configuration status quickly which in
turn would allow it to reconfigure the IP link faster than today.
This document aims at providing definitions for key terms used by the
group.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Security Considerations . . . . . . . . . . . . . . . . . . . . 4
4. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 4
Normative references . . . . . . . . . . . . . . . . . . . . . . 4
Informative References . . . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
Intellectual Property and Copyright Statements . . . . . . . . . 6
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1. Introduction
Hosts need link-layer connectivity and correct IP layer configuration
for sending and receiving packets. When a node suspects that
link-layer connectivity has undergone change, it needs to check
whether its IP layer connectivity or configuration are still valid.
The DNA working group is working on solutions to detect IP layer
connectivity changes and re-configures the IP configuration quickly.
This document defines the key terms used by the group.
2. Terminology
The following terminology is presented to describe components that
are required for reliable detection of network attachment.
Link Instance: A domain where all connected hosts may be reached
through local broadcast or all-nodes multicast transmission.
Neighbor: A host or router on the same link-instance as the node.
Internet Connectivity: A state where a host can maintain
communications with arbitrary destinations on the Internet.
Network Attachment: An event subsequent to link-layer connection
occurs when a host is able to send and receive some IP datagrams
(particularly for configuration purposes) within a link-instance.
IP Subnet: A range of addresses that share a common global prefix.
Full Reachability: Also called Bi-directional Reachability. A
neighbor is supposed to be fully reachable if one can both send
and receive packets.
IP link: A communication facility or medium over which nodes can
communicate at the link layer.
Partial Reachability Evidence that a host is within transmission or
reception range of a neighbor. Reachability state is assumed to
be available if a host receives advertisements from or data
through the neighbor in question.
Link Hint: f An indication from the link-layer to the IP layer that a
change in link state may have occurred. These hints, while not
considered authoritative for IP configuration, but can be used to
initiate reachability checks or start to inquire about network
information.
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Eager Configuration Switching: An algorithm by which systems eagerly
perform configuration signaling, without checking reachability of
their neighbors or routers. Note that these systems may cause
excessive configuration and signaling in some network topologies.
Lazy Configuration Switching: An algorithm by which systems check
reachability with its currently configured routers before
undertaking configuration signaling. Most reachability checks
take some time to determine a neighbor's absence, which will cause
delays to configuration in lazy systems.
Change Detection Evidence that the IP configuration on a link has
changed, and that the host's IP address, routes, MLD groups or
other data that may require updating.
Link Information Parameters: Link Information Parameters are defined
in the context of DNA as signal strength, signal quality and
throughput.
3. Security Considerations
This document presents only terminology. There are no security
issues in this document.
4. Acknowledgments
Thanks to participants within the DNA BOF whose emails and input help
craft the terminology in this document.
Normative references
[1] Johnson, D., Perkins, C. and J. Arkko, "Mobility Support in
IPv6", draft-ietf-mobileip-ipv6-24.txt Work In Progress, June
2003.
Informative References
[2] Manner, J. and M. Kojo, "Mobility Related Terminology",
draft-ietf-seamoby-mobility-terminology-05.txt Work In Progress,
, November 2003.
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Authors' Addresses
Shu Yamamoto
KDDI Labs USA
Palo Alto 94301
United States
Phone: +650.566.8165
EMail: shu@kddilabs.com
Carl Williams
KDDI Labs USA
Palo Alto, CA 94301
USA
Phone: +1.650.279.5903
EMail: carlw@kddilabs.com
Greg Daley
Monash University CTIE
Department of Electrical and Computer Systems Engineering
Phone:
EMail: greg.daley@eng.monash.edu.au
Mohan Parthasarathy
Palo Alto, CA 95015
United States
EMail: mohanp@sbcglobal.net
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Intellectual Property Statement
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Acknowledgment
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