< draft-ietf-ippm-lmap-path-04.txt   draft-ietf-ippm-lmap-path-05.txt >
Network Working Group M. Bagnulo Network Working Group M. Bagnulo
Internet-Draft UC3M Internet-Draft UC3M
Intended status: Informational T. Burbridge Intended status: Informational T. Burbridge
Expires: December 21, 2014 BT Expires: February 6, 2015 BT
S. Crawford S. Crawford
SamKnows SamKnows
P. Eardley P. Eardley
BT BT
A. Morton A. Morton
AT&T Labs AT&T Labs
June 19, 2014 August 5, 2014
A Reference Path and Measurement Points for LMAP A Reference Path and Measurement Points for LMAP
draft-ietf-ippm-lmap-path-04 draft-ietf-ippm-lmap-path-05
Abstract Abstract
This document defines a reference path for Large-scale Measurement of This document defines a reference path for Large-scale Measurement of
Broadband Access Performance (LMAP) and measurement points for Broadband Access Performance (LMAP) and measurement points for
commonly used performance metrics. The methods for measurement point commonly used performance metrics. Other similar measurement
location may be applicable to similar measurement projects using the projects may also be able to use the extensions described here for
extensions described here. measurement point location.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on December 21, 2014. This Internet-Draft will expire on February 6, 2015.
Copyright Notice Copyright Notice
Copyright (c) 2014 IETF Trust and the persons identified as the Copyright (c) 2014 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3 1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Purpose and Scope . . . . . . . . . . . . . . . . . . . . . . 3 2. Purpose and Scope . . . . . . . . . . . . . . . . . . . . . . 3
3. Terms and Definitions . . . . . . . . . . . . . . . . . . . . 4 3. Terms and Definitions . . . . . . . . . . . . . . . . . . . . 4
3.1. Reference Path . . . . . . . . . . . . . . . . . . . . . 4 3.1. Reference Path . . . . . . . . . . . . . . . . . . . . . 4
3.2. Subscriber . . . . . . . . . . . . . . . . . . . . . . . 4 3.2. Subscriber . . . . . . . . . . . . . . . . . . . . . . . 4
3.3. Dedicated Component (Links or Nodes) . . . . . . . . . . 4 3.3. Dedicated Component (Links or Nodes) . . . . . . . . . . 4
3.4. Shared Component (Links or Nodes) . . . . . . . . . . . . 4 3.4. Shared Component (Links or Nodes) . . . . . . . . . . . . 4
3.5. Resource Transition Point . . . . . . . . . . . . . . . . 4 3.5. Resource Transition Point . . . . . . . . . . . . . . . . 5
3.6. Managed and Un-Managed Sub-paths . . . . . . . . . . . . 5 3.6. Managed and Un-Managed Sub-paths . . . . . . . . . . . . 5
4. Reference Path . . . . . . . . . . . . . . . . . . . . . . . 5 4. Reference Path . . . . . . . . . . . . . . . . . . . . . . . 5
5. Measurement Points . . . . . . . . . . . . . . . . . . . . . 6 5. Measurement Points . . . . . . . . . . . . . . . . . . . . . 6
6. Translation Between Reference Path and Various Technologies . 10 6. Translation Between Reference Path and Various Technologies . 10
7. Example Resource Transition . . . . . . . . . . . . . . . . . 11 7. Example Resource Transition . . . . . . . . . . . . . . . . . 12
8. Security considerations . . . . . . . . . . . . . . . . . . . 12 8. Security considerations . . . . . . . . . . . . . . . . . . . 13
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 13 10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 13
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 13 11. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
11.1. Normative References . . . . . . . . . . . . . . . . . . 13 11.1. Normative References . . . . . . . . . . . . . . . . . . 13
11.2. Informative References . . . . . . . . . . . . . . . . . 13 11.2. Informative References . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 13 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14
1. Introduction 1. Introduction
This document defines a reference path for Large-scale Measurement of This document defines a reference path for Large-scale Measurement of
Broadband Access Performance (LMAP) or similar measurement projects. Broadband Access Performance (LMAP) or similar measurement projects.
The series of IP Performance Metrics (IPPM) RFCs have developed terms The series of IP Performance Metrics (IPPM) RFCs have developed terms
that are generally useful for path description (section 5 of that are generally useful for path description (section 5 of
[RFC2330]). There are a limited number of additional terms needing [RFC2330]). There are a limited number of additional terms needing
definition here, and they will be defined in this memo. definition here, and they will be defined in this memo.
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technologies (with differing underlying architectures) is within the technologies (with differing underlying architectures) is within the
scope of this method, and examples are provided. Both wired and scope of this method, and examples are provided. Both wired and
wireless technologies are in-scope. wireless technologies are in-scope.
The purpose is to create an efficient way to describe the location of The purpose is to create an efficient way to describe the location of
the measurement point(s) used to conduct a particular measurement so the measurement point(s) used to conduct a particular measurement so
that the measurement result will adequately described in terms of that the measurement result will adequately described in terms of
scope or coverage. This should serve many measurement uses, scope or coverage. This should serve many measurement uses,
including: including:
diagnostic: where the same metric may be measured over many diagnostic: where the same metric would be measured on different
different path scopes sub-paths bounded by measurement points (see Section 4.10
of[RFC5835]), for example to isolate the sub-path contributing the
majority of impairment levels observed on a path.
comparison: where the same metric may be measured on equivalent comparison: where the same metric may be measured on equivalent
portions of different network infrastructures portions of different network infrastructures, for example to
compare the performance of wired and wireless home network
technologies.
3. Terms and Definitions 3. Terms and Definitions
This section defines key terms and concepts for the purposes of this This section defines key terms and concepts for the purposes of this
memo. memo.
3.1. Reference Path 3.1. Reference Path
A reference path is a serial combination of routers, switches, links, A reference path is a serial combination of routers, switches, links,
radios, and processing elements that comprise all the network radios, and processing elements that comprise all the network
elements traversed by each packet between the source and destination elements traversed by each packet between the source and destination
hosts. The reference path is intended to be equally applicable to hosts. The reference path is intended to be equally applicable to
all networking technologies, therefore the components are generically all networking technologies, therefore the components are generically
defined, but their functions should have a clear counterpart or be defined, but their functions should have a clear counterpart or be
obviously omitted in any network technology. obviously omitted in any network technology.
3.2. Subscriber 3.2. Subscriber
An entity (associated with one or more users) that is engaged in a An entity (associated with one or more users) that is engaged in a
subscription with a service provider. The subscriber is allowed to subscription with a service provider. The subscriber is allowed to
subscribe and un-subscribe services, and to register a user or a list subscribe and un-subscribe to services, and to register a user or a
of users authorized to enjoy these services. [Q1741] Both the list of users authorized to enjoy these services. [Q1741] Both the
subscriber and service provider are allowed to set the limits subscriber and service provider are allowed to set the limits
relative to the use that associated users make of subscribed relative to the use that associated users make of subscribed
services. services.
3.3. Dedicated Component (Links or Nodes) 3.3. Dedicated Component (Links or Nodes)
All resources of a Dedicated component (typically a link or node on All resources of a Dedicated component (typically a link or node on
the Reference Path) are allocated to serving the traffic of an the Reference Path) are allocated to serving the traffic of an
individual Subscriber. Resources include transmission time-slots, individual Subscriber. Resources include transmission time-slots,
queue space, processing for encapsulation and address/port queue space, processing for encapsulation and address/port
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management of the subscriber's service provider. This means that management of the subscriber's service provider. This means that
private networks, wireless networks using unlicensed frequencies, and private networks, wireless networks using unlicensed frequencies, and
the networks of other service are designated as un-managed sub-paths. the networks of other service are designated as un-managed sub-paths.
The Service demarcation point always divides managed and un-managed The Service demarcation point always divides managed and un-managed
sub-paths. sub-paths.
4. Reference Path 4. Reference Path
This section defines a reference path for Internet communication. This section defines a reference path for Internet communication.
Subsc. -- Private -- Private -- Service-- Intra IP -- GRA -- Transit Subsc. -- Private -- Private -- Service-- Intra IP -- GRA -- Transit ...
device Net #1 Net #2 Demarc. Access GW GRA GW device Net #1 Net #2 Demarc. Access GW GRA GW
... Transit -- GRA -- Service -- Private -- Private -- Destination ... Transit -- GRA -- Service -- Private -- Private -- Destination
GRA GW GW Demarc. Net #n Net #n+1 Host GRA GW GW Demarc. Net #n Net #n+1 Host
GRA = Globally Routable Address, GW = Gateway GRA = Globally Routable Address, GW = Gateway
The following are descriptions of reference path components that may The following are descriptions of reference path components that may
not be clear from their name alone. not be clear from their name alone.
o Subsc. (Subscriber) device - This is a host that normally o Subsc. (Subscriber) device - This is a host that normally
originates and terminates communications conducted over the IP originates and terminates communications conducted over the IP
packet transfer service. packet transfer service.
o Private Net #x - This is a network of devices owned and operated o Private Net #x - This is a network of devices owned and operated
by the Internet Service Subscriber. In some configurations, one by the Internet Service Subscriber. In some configurations, one
or more private networks and the device that provides the Service or more private networks and the device that provides the Service
Demarcation point are collapsed in a single device (and ownership Demarcation point are collapsed in a single device (and ownership
may shift to the service provider), and this should be noted as may shift to the service provider), and this should be noted as
part of the path description. part of the path description.
o Service Demarcation point - This is the point where service o Service Demarcation point - This is the point where service
managed by the serivce provider begins (or ends), and varies by managed by the service provider begins (or ends), and varies by
technology. For example, this point is usually defined as the technology. For example, this point is usually defined as the
Ethernet interface on a residential gateway or modem where the Ethernet interface on a residential gateway or modem where the
scope of a packet transfer service begins and ends. In the case scope of a packet transfer service begins and ends. In the case
of a WiFi Service, this would be an Air Interface within the of a WiFi Service, this would be an Air Interface within the
intended service boundary (e.g., walls of the coffee shop). The intended service boundary (e.g., walls of the coffee shop). The
Demarcation point may be within an integrated endpoint using an Demarcation point may be within an integrated endpoint using an
Air Interface (e.g., LTE UE). Ownership may not affect the Air Interface (e.g., LTE UE). Ownership does not necessarily
demarcation point; a Subscriber may own all equipment on their affect the demarcation point; a Subscriber may own all equipment
premises, but it is likely that the service provider will certify on their premises, but it is likely that the service provider will
such equipment for connection to their network, or a third-party certify such equipment for connection to their network, or a
will certify standards compliance. third-party will certify standards compliance.
o Intra IP Access - This is the first point in the access o Intra IP Access - This is the first point in the access
architecture beyond the Service Demarc. where a globally routable architecture beyond the Service Demarc. where a globally routable
IP address is exposed and used for routing. In architectures that IP address is exposed and used for routing. In architectures that
use tunneling, this point may be equivalent to the GRA GW. This use tunneling, this point may be equivalent to the GRA GW. This
point could also collapse to the device providing the Service point could also collapse to the device providing the Service
Demarc., in principle. Only one Intra IP Access point is shown, Demarc., in principle. Only one Intra IP Access point is shown,
but they can be identified in any access network. but they can be identified in any access network.
o GRA GW - the point of interconnection between a Service Provider's o GRA GW - the point of interconnection between a Service Provider's
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o Transit GRA GW - If one or more networks intervene between the o Transit GRA GW - If one or more networks intervene between the
Service Provider's access networks of the Subscriber and of the Service Provider's access networks of the Subscriber and of the
Destination Host, then such networks are designated "transit" and Destination Host, then such networks are designated "transit" and
are bounded by two Transit GRA GW. are bounded by two Transit GRA GW.
Use of multiple IP address families in the measurement path must be Use of multiple IP address families in the measurement path must be
noted, as the conversions between IPv4 and IPv6 certainly influence noted, as the conversions between IPv4 and IPv6 certainly influence
the visibility of a GRA for each family. the visibility of a GRA for each family.
In the case that a private address space is used throughout an access In the case that a private address space is used throughout an access
architecture, then the Service Demarc. and the Intra IP Access points architecture, then the Intra IP Access points must use the same
must use the same address space and be separated by the shared and address space as the Service Demarcation point, and the Intra IP
dedicated access link infrastructure, such that a test between these Access points must be selected such that a test between these points
points produces a useful assessment of access performance. produces a useful assessment of access performance (e.g., includes
both shared and dedicated access link infrastructure).
5. Measurement Points 5. Measurement Points
A key aspect of measurement points, beyond the definition in section A key aspect of measurement points, beyond the definition in section
4.1 of [RFC5835], is that the innermost IP header and higher layer 4.1 of [RFC5835], is that the innermost IP header and higher layer
information must be accessible through some means. This is essential information must be accessible through some means. This is essential
to measure IP metrics. There may be tunnels and/or other layers to measure IP metrics. There may be tunnels and/or other layers
which encapsulate the innermost IP header, even adding another IP which encapsulate the innermost IP header, even adding another IP
header of their own. header of their own.
In general, measurement points cannot always be located exactly where In general, measurement points cannot always be located exactly where
desired. However, the definition in [RFC5835] and the discussion in desired. However, the definition in [RFC5835] and the discussion in
section 5.1 of [RFC3432] indicate that allowances can be made: for section 5.1 of [RFC3432] indicate that allowances can be made: for
example, it is nearly ideal when there are deterministic errors that example, it is nearly ideal when there are deterministic errors that
can be quantified between desired and actual measurement point. can be quantified between desired and actual measurement point.
The Figure below illustrates the assignment of measurement points to The Figure below illustrates the assignment of measurement points to
selected components of the reference path. selected components of the reference path.
Subsc. -- Private -- Private -- Service-- Intra IP -- GRA -- Transit Subsc. -- Private -- Private -- Service-- Intra IP -- GRA -- Transit ...
device Net #1 Net #2 Demarc. Access GW GRA GW device Net #1 Net #2 Demarc. Access GW GRA GW
mp000 mp100 mp150 mp190 mp200 mp000 mp100 mp150 mp190 mp200
... Transit -- GRA -- Service -- Private -- Private -- Destination ... Transit -- GRA -- Service -- Private -- Private -- Destination
GRA GW GW Demarc. Net #n Net #n+1 Host GRA GW GW Demarc. Net #n Net #n+1 Host
mpX90 mp890 mp800 mp900 mpX90 mp890 mp800 mp900
GRA = Globally Routable Address, GW = Gateway GRA = Globally Routable Address, GW = Gateway
Figure 1 Figure 1
When communicating the results of measurements using the measurement Each measurement point on a specific reference path MUST be assigned
point designations described here, the measuring organization SHOULD a unique number. To facilitate interpretation of the results, the
supply a diagram similar to Figure 1 (and the technology-specific measuring organisation (and whoever it shares results with) MUST have
examples that follow), and MUST supply it when additional measurement an unambiguous understanding of what path or point was measured. In
point numbers have been defined and used, with sufficient detail to order to achieve this, a set of numbering recommendations follow.
identify measurement locations in the path. Organizations with
similar technologies and architectures are encouraged to coordinate When communicating the results of measurements, the measuring
on local numbering and diagrams, when possible. organization SHOULD supply a diagram similar to Figure 1 (with the
technology-specific information in examples that follow), and MUST
supply it when additional measurement point numbers have been defined
and used, with sufficient detail to identify measurement locations in
the path.
Ideally, the consumer of measurement results would know the location
of a measurement point on the reference path from the measurement
point number alone, and the recommendations below provide a way to
accomplish this goal. Although the initial numbering may be fully
compliant with this system, network growth, consolidation, and re-
arrangement, or circumstances such as ownership changes, could cause
gaps in network numbers or non-monotonic measurement point number
assignments along the path over time. These are examples of
reasonable causes for numbering deviations which must be identified
on the reference path diagram, as required above.
Whilst the numbering of a measurement point is in the context of a
particular path, for simplicity the measuring organisation SHOULD use
the same numbering for a device (playing the same role) on all the
measurement paths through it. Similarly, whilst the measurement
point numbering is in the context of a particular measuring
organisation, organizations with similar technologies and
architectures are encouraged to coordinate on local numbering and
diagrams.
The measurement point numbering system, mpXnn, has two independent The measurement point numbering system, mpXnn, has two independent
parts: parts:
1. The X in mpXnn indicates the network number. The network with 1. The X in mpXnn indicates the network number. The network with
the Subscriber's device is network 0. The network of a different the Subscriber's device is network 0. The network of a different
organization (administrative or ownership domains) SHOULD be organization (administrative or ownership domains) SHOULD be
assigned a different number. Each successive network number assigned a different number. Each successive network number
SHOULD be one greater than the previous network's number. Two SHOULD be one greater than the previous network's number. Two
circumstances make it necessary to designate X=9 in the circumstances make it necessary to designate X=9 in the
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B. 90 SHOULD be used for a measurement point at the GW of a B. 90 SHOULD be used for a measurement point at the GW of a
network (opposite from the Subscriber's device or Service network (opposite from the Subscriber's device or Service
Demarc.). Demarc.).
C. In most networks, measurement point numbers SHOULD C. In most networks, measurement point numbers SHOULD
monotonically increase from point nearest the Subscriber's monotonically increase from point nearest the Subscriber's
device to the opposite network boundary on the path (see device to the opposite network boundary on the path (see
below). below).
D. When a Detination host is part of the path, 00 SHOULD be used D. When a Destination host is part of the path, 00 SHOULD be
for a measurement point at the Destination host and at the used for a measurement point at the Destination host and at
the Destination's Service Demarcation point. Measurement the Destination's Service Demarcation point. Measurement
point numbers SHOULD monotonically increase from point point numbers SHOULD monotonically increase from point
nearest the Destination's host to the opposite network nearest the Destination's host to the opposite network
boundary on the path ONLY in these networks. This boundary on the path ONLY in these networks. This
directional numbering reversal allows consistent 00 directional numbering reversal allows consistent 00
designation for end hosts and Service Demarcs. designation for end hosts and Service Demarcs.
E. 50 MAY be used for an intermediate measurement point of E. 50 MAY be used for an intermediate measurement point of
significance, such as a Network Address Translator (NAT). significance, such as a Network Address Translator (NAT).
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DSLAM within a network. DSLAM within a network.
G. Any other measurement points SHOULD be assigned unused G. Any other measurement points SHOULD be assigned unused
integers between 01 and 99. The assignment SHOULD be stable integers between 01 and 99. The assignment SHOULD be stable
for at least the duration of a particular measurement study, for at least the duration of a particular measurement study,
and SHOULD avoid numbers that have been assigned to other and SHOULD avoid numbers that have been assigned to other
locations within network X (unless the assignment is locations within network X (unless the assignment is
considered sufficiently stale). Sub-networks or domains considered sufficiently stale). Sub-networks or domains
within a network are useful locations for measurement points. within a network are useful locations for measurement points.
In order to define the measurement points and the scope of When supplying a diagram of the reference path and measurement
measurements without ambiguity, the operator of the measurement points, the operator of the measurement system MUST indicate: the
system SHOULD indicate on a diagram (similar to those in this reference path, the numbers (mpXnn) of the measurement points, and
document): the reference path, the numbers (mpXnn) of the measurement the technology-specific definition of any measurement point other
points, and the definition of any measurement point other than 00 and than X00 and X90 with sufficient detail to clearly define its
90 (with sufficient detail to clearly define its location). location (similar to the technology-specific examples in Section 6 of
this document).
If the number of intermediate networks (between the source and If the number of intermediate networks (between the source and
destination) is not known or is unstable, then this SHOULD be destination) is not known or is unstable, then this SHOULD be
indicated on the diagram and results from measurement points within indicated on the diagram and results from measurement points within
those networks need to be treated with caution. those networks need to be treated with caution.
Notes: Notes:
o Some use the terminology "on-net" and "off-net" when referring to o Some use the terminology "on-net" and "off-net" when referring to
the Subscriber's Internet Service Provider (ISP) measurement the Subscriber's Internet Service Provider (ISP) measurement
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mp150, then the private address side of the CGN could be mp150, then the private address side of the CGN could be
designated mp149 for tests with mp100. designated mp149 for tests with mp100.
o Measurement points at Transit GRA GWs are numbered mpX00 and o Measurement points at Transit GRA GWs are numbered mpX00 and
mpX90, where X is the lowest positive integer not already used in mpX90, where X is the lowest positive integer not already used in
the path. The GW of first transit network is shown, with point the path. The GW of first transit network is shown, with point
mp200 and the last transit network GW with mpX90. mp200 and the last transit network GW with mpX90.
6. Translation Between Reference Path and Various Technologies 6. Translation Between Reference Path and Various Technologies
This section and those that follow are intended to provide a more This section and those that follow are intended to provide example
exact mapping between particular network technologies and the mappings between particular network technologies and the reference
reference path. path.
We provide an example for 3G Cellular access below. We provide an example for 3G Cellular access below.
Subscriber -- Private --- Service ------------- GRA --- Transit ... Subscriber -- Private --- Service ------------- GRA --- Transit ...
device Net #1 Demarc. GW GRA GW device Net #1 Demarc. GW GRA GW
mp000 mp100 mp190 mp200 mp000 mp100 mp190 mp200
|_____________UE______________|___RAN+Core____|___GGSN__| |_____________UE______________|___RAN+Core____|___GGSN__|
|_____Un-managed sub-path_____|____Managed sub-path_____| |_____Un-managed sub-path_____|____Managed sub-path_____|
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access point and this is the only networking device in the home access point and this is the only networking device in the home
network, all endpoints attach directly to the CPE though the WiFi network, all endpoints attach directly to the CPE though the WiFi
access. access.
We believe this is a fairly common configuration in some parts of the We believe this is a fairly common configuration in some parts of the
world and fairly simple as well. world and fairly simple as well.
This case would map into the defined reference measurement points as This case would map into the defined reference measurement points as
follows: follows:
Subsc. -- Private -- Private -- Service-- Intra IP -- GRA -- Transit Subsc. -- Private -- Private -- Service-- Intra IP -- GRA -- Transit ...
device Net #1 Net #2 Demarc. Access GW GRA GW device Net #1 Net #2 Demarc. Access GW GRA GW
mp000 mp100 mp150 mp190 mp200 mp000 mp100 mp150 mp190 mp200
|--UE--|------------CPE/NAT--------|------|-BRAS-|------| |--UE--|------------CPE/NAT--------|------|-BRAS-|------|
|------DSL Network---| |------DSL Network---|
|_______Un-managed sub-path________|__Managed sub-path__| |_______Un-managed sub-path________|__Managed sub-path__|
GRA = Globally Routable Address, GW = Gateway, BRAS = Broadband GRA = Globally Routable Address, GW = Gateway, BRAS = Broadband
Remote Acess Server Remote Access Server
Consider next another access network case where: Consider next another access network case where:
o The Customer Premises Equipment (CPE) is a NAT device that is o The Customer Premises Equipment (CPE) is a NAT device that is
configured with a private IP address. configured with a private IP address.
o There is a Carrier Grade NAT (CGN) located deep in the Access ISP o There is a Carrier Grade NAT (CGN) located deep in the Access ISP
network. network.
o The CPE is a home router that has also an incorporated a WiFi o The CPE is a home router that has also an incorporated a WiFi
access point and this is the only networking device in the home access point and this is the only networking device in the home
network, all endpoints attach directly to the CPE though the WiFi network, all endpoints attach directly to the CPE though the WiFi
access. access.
We believe this is becoming a fairly common configuration in some We believe this is becoming a fairly common configuration in some
parts of the world. parts of the world.
This case would map into the defined reference measurement points as This case would map into the defined reference measurement points as
follows: follows:
Subsc. -- Private ------------- Service-- Intra IP -- GRA -- Transit Subsc. -- Private ------------- Service-- Intra IP -- GRA -- Transit ...
device Net #1 Demarc. Access GW GRA GW device Net #1 Demarc. Access GW GRA GW
mp000 mp100 mp150 mp190 mp200 mp000 mp100 mp150 mp190 mp200
|--UE--|------------CPE/NAT--------|------|-CGN-|------| |--UE--|------------CPE/NAT--------|------|-CGN-|------|
|--Access Network---| |--Access Network---|
|_______Un-managed sub-path________|_Managed sub-path__| |_______Un-managed sub-path________|_Managed sub-path__|
GRA = Globally Routable Address, GW = Gateway GRA = Globally Routable Address, GW = Gateway
7. Example Resource Transition 7. Example Resource Transition
This section gives an example of Shared and Dedicated portions with This section gives an example of Shared and Dedicated portions with
the reference path. This example shows two Resource Transition the reference path. This example shows two Resource Transition
Points. Points.
Consider the case where: Consider the case where:
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upon reaching the Carrier Grade NAT (CGN), thus there is a upon reaching the Carrier Grade NAT (CGN), thus there is a
Resource Transition Point and further network components are Resource Transition Point and further network components are
designated as Shared Resources. designated as Shared Resources.
We believe this is a fairly common configuration in parts of the We believe this is a fairly common configuration in parts of the
world. world.
This case would map into the defined reference measurement points as This case would map into the defined reference measurement points as
follows: follows:
Subsc. -- Private -- Private -- Access -- Intra IP -- GRA -- Transit Subsc. -- Private -- Private -- Access -- Intra IP -- GRA -- Transit ...
device Net #1 Net #2 Demarc. Access GW GRA GW device Net #1 Net #2 Demarc. Access GW GRA GW
mp000 mp100 mp150 mp190 mp200 mp000 mp100 mp150 mp190 mp200
|--UE--|------------CPE/NAT--------|------|-CGN-|------| |--UE--|------------CPE/NAT--------|------|-CGN-|------|
| Wi-Fi | 1000Base-T |--Access Network---| | Wi-Fi | 1000Base-T |--Access Network---|
|-Shared--|RT|------Dedicated------| RT |-----Shared------... |-Shared--|RT|------Dedicated------| RT |-----Shared------...
|_______Un-managed sub-path________|_Managed sub-path__| |_______Un-managed sub-path________|_Managed sub-path__|
GRA = Globally Routable Address, GW = Gateway, RT = Resource GRA = Globally Routable Address, GW = Gateway, RT = Resource
Transition Point Transition Point
8. Security considerations 8. Security considerations
Specification of a Reference Path and identification of measurement Specification of a Reference Path and identification of measurement
points on the path represent agreements among interested parties, and points on the path represent agreements among interested parties, and
they present no threat to the readers of this memo or to the Internet they present no threat to the readers of this memo or to the Internet
itself. itself.
skipping to change at page 13, line 34 skipping to change at page 14, line 21
[RFC5835] Morton, A. and S. Van den Berghe, "Framework for Metric [RFC5835] Morton, A. and S. Van den Berghe, "Framework for Metric
Composition", RFC 5835, April 2010. Composition", RFC 5835, April 2010.
11.2. Informative References 11.2. Informative References
[I-D.ietf-lmap-framework] [I-D.ietf-lmap-framework]
Eardley, P., Morton, A., Bagnulo, M., Burbridge, T., Eardley, P., Morton, A., Bagnulo, M., Burbridge, T.,
Aitken, P., and A. Akhter, "A framework for large-scale Aitken, P., and A. Akhter, "A framework for large-scale
measurement platforms (LMAP)", draft-ietf-lmap- measurement platforms (LMAP)", draft-ietf-lmap-
framework-06 (work in progress), June 2014. framework-07 (work in progress), June 2014.
[SK] Crawford, Sam., "Test Methodology White Paper", SamKnows [SK] Crawford, Sam., "Test Methodology White Paper", SamKnows
Whitebox Briefing Note Whitebox Briefing Note
http://www.samknows.com/broadband/index.php, July 2011. http://www.samknows.com/broadband/index.php, July 2011.
[Q1741] Q.1741.7, , "IMT-2000 references to Release 9 of GSM- [Q1741] Q.1741.7, , "IMT-2000 references to Release 9 of GSM-
evolved UMTS core network", evolved UMTS core network",
http://www.itu.int/rec/T-REC-Q.1741.7/en, November 2011. http://www.itu.int/rec/T-REC-Q.1741.7/en, November 2011.
Authors' Addresses Authors' Addresses
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