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[ANCP] FW: draft-bitar-wadhwa-ancp-pon-00.txt
Hi All
We have submitted a new draft (attached) on ANCP applicability to PON
to the IETF repository, ahead of the cutoff for version 00. We expect
the draft to be posted soon. Any feedback is appreciated.
Thanks
-Sanjay & Nabil
----- Original Message -----
From: "Sanjay Wadhwa" <swadhwa at juniper.net>
To: <internet-drafts at ietf.org>
Cc: <nabil.n.bitar at verizon.com>; <nnbitar at verizon.net>; "Sanjay Wadhwa"
<swadhwa at juniper.net>
Sent: Monday, July 07, 2008 7:27 PM
Subject: draft-bitar-wadhwa-ancp-pon-00.txt
Please find attached draft-bitar-wadhwa-ancp-pon-00.txt ("Applicability
of
Access Node Control Mechanism to PON based Broadband Networks"). We
would
like the draft to be posted to the ietf repository.
<<draft-bitar-wadhwa-ancp-pon-00.txt>>
Thanks
-Sanjay Wadhwa & Nabil Bitar
<<draft-bitar-wadhwa-ancp-pon-00.txt>>
>
>
>
>
>
>
>On Mon, July 7, 2008 4:27 pm, Sanjay Wadhwa wrote:
>> Please find attached draft-bitar-wadhwa-ancp-pon-00.txt=From ancp-bounces at ietf.org Sat Jul 12 05:46:09 2008
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Thread-Topic: draft-bitar-wadhwa-ancp-pon-00.txt
Thread-Index: AcjhGYBeFmpB5qP7R2qqQJaBGmUzhQAndSbwAJiH3LAFrom: "Sanjay Wadhwa" <swadhwa at juniper.net>
To: <ancp at ietf.org>
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Cc: nabil.n.bitar at verizon.com, nnbitar at verizon.net
Subject: [ANCP] FW: draft-bitar-wadhwa-ancp-pon-00.txt
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Hi All
We have submitted a new draft (attached) on ANCP applicability to PON
to the IETF repository, ahead of the cutoff for version 00. We expect
the draft to be posted soon. Any feedback is appreciated.
Thanks
-Sanjay & Nabil
----- Original Message -----
From: "Sanjay Wadhwa" <swadhwa at juniper.net>
To: <internet-drafts at ietf.org>
Cc: <nabil.n.bitar at verizon.com>; <nnbitar at verizon.net>; "Sanjay Wadhwa"
<swadhwa at juniper.net>
Sent: Monday, July 07, 2008 7:27 PM
Subject: draft-bitar-wadhwa-ancp-pon-00.txt
Please find attached draft-bitar-wadhwa-ancp-pon-00.txt ("Applicability
of
Access Node Control Mechanism to PON based Broadband Networks"). We
would
like the draft to be posted to the ietf repository.
<<draft-bitar-wadhwa-ancp-pon-00.txt>>
Thanks
-Sanjay Wadhwa & Nabil Bitar
<<draft-bitar-wadhwa-ancp-pon-00.txt>>
>
>
>
>
>
>
>On Mon, July 7, 2008 4:27 pm, Sanjay Wadhwa wrote:
>> Please find attached draft-bitar-wadhwa-ancp-pon-00.txt
>("Ap20
>("Applicability of
>> Access Node Control Mechanism to PON based Broadband
>Networks"). We would
>> like the draft to be posted to the ietf repository.
>>
>> <<draft-bitar-wadhwa-ancp-pon-00.txt>>
>>
>> Thanks
>> -Sanjay Wadhwa & Nabil Bitar
>>
>> <<draft-bitar-wadhwa-ancp-pon-00.txt>>
>>
>
>
>
Network Working Group Nabil Bitar
Internet Draft Verizon
Expires: Jan 7, 2009
Sanjay Wadhwa
Juniper Networks
July 7, 2008
Applicability of Access Node Control Mechanism to
PON based Broadband Networks
draft-bitar-wadhwa-ancp-pon-00.txt
Status of this Memo
By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware
have been or will be disclosed, and any of which he or she becomes
aware will be disclosed, in accordance with section 6 of BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts. Internet-Drafts are draft documents valid for a maximum of
six months and may be updated, replaced, or obsoleted by other
documents at any time. It is inappropriate to use Internet-Drafts as
reference material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html
This Internet-Draft will expire on Jan 7, 2009.
Abstract
The purpose of this document is to provide applicability of Access
Node Control Mechanism, as described in [ANCP-FRAMEWORK], to PON
Bitar-Wadhwa Expires Jan 7, 2009 [Page 1]
Internet-Draft draft-bitar-wadhwa-ancp-pon-00 July 2008
based broadband access. The need for an Access Node Control Mechanism
between¦X?i¸¥?ܨ| zË
¡×?¢{k¢S r§?É ó?m« tèiÖÚ?
Network Working Group Nabil Bitar
Internet Draft Verizon
Expires: Jan 7, 2009
Sanjay Wadhwa
Juniper Networks
July 7, 2008
Applicability of Access Node Control Mechanism to
PON based Broadband Networks
draft-bitar-wadhwa-ancp-pon-00.txt
Status of this Memo
By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware
have been or will be disclosed, and any of which he or she becomes
aware will be disclosed, in accordance with section 6 of BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts. Internet-Drafts are draft documents valid for a maximum of
six months and may be updated, replaced, or obsoleted by other
documents at any time. It is inappropriate to use Internet-Drafts as
reference material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html
This Internet-Draft will expire on Jan 7, 2009.
Abstract
The purpose of this document is to provide applicability of Access
Node Control Mechanism, as described in [ANCP-FRAMEWORK], to PON
Bitar-Wadhwa Expires Jan 7, 2009 [Page 1]
Internet-Draft draft-bitar-wadhwa-ancp-pon-00 July 2008
based broadband access. The need for an Access Node Control Mechanism
between a Net a Network Access Server (NAS) and an Access Node Complex (a
combination of Optical Line Termination (OLT) and Optical Network
Termination (ONT) elements), is described in a multi-service
reference architecture in order to perform QoS-related, service-
related and Subscriber-related operations. The Access Node Control
Mechanism is also extended for interaction between components of the
Access Node Complex (OLT and ONT). The Access Node Control mechanism
will ensure that the transmission of the information does not need to
go through distinct element managers but rather uses a direct device-
device communication. This allows for performing access link related
operations within those network elements to meet performance
objectives.
Table of Contents
1 Specification Requirements 4
2 Introduction 4
2.1 Terminology..............................................5
3 Reference Architecture for PON Based Broadband Access Network 7
3.1 Home Gateway.............................................9
3.2 PON Access...............................................9
3.3 Access Node Complex......................................9
3.4 Access Node Complex Uplink to the BNG....................9
3.5 Aggregation Network......................................9
3.6 Network Access Server...................................10
3.7 Regional Network........................................10
4 Motivation for explicit extension of ANCP to FTTP PON 10
5 Concept of Access Node Control Mechanism for PON based access 11
6 Multicast 13
6.1 Multicast Conditional Access............................14
6.2 Multicast Admission Control.............................17
6.3 Multicast Accounting....................................28
7 Remote Connectivity Check 29
Bitar-Wadhwa Expires Jan 7, 2009 [Page 2]
Internet-Draft draft-bitar-wadhwa-ancp-pon-00 July 2008
8 Access Topology Discovery 30
9 Security Considerations 31
10 Acknowledgements 31
11 References 31
11.1 Normative References....................................31
11.2 Informative References..................................31
Author
's Addresses 32
Full Copyright Statement 32
Copyright (C) The IETF Trust (2008). 32
Intellectual Property 32
Bitar-Wadhwa Expires Jan 7, 2009 [Page 3]
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<?4(???????????¹????¹Õµ??È?½??=ÁÑ¥??°?9?Ñݽɬ?U¹¥ÑÌ?½È?Q?ɵ¥¹?±Ì?¡=9T½=9P¤?¹??È?4(???????????¹??ÕÍ?ÉÌ°?Ý¥Ñ ??¸?½ÁÑ¥??°??¥ÍÑÉ¥?ÕÑ¥½¸?¹?Ñݽɬ?¡=8¤??½µÁ½Í???½??4(?????nt). While linear programming content can be provided over
Layer1 on the PON, the focus in this document is on delivering linear
programming content over IP to the home, using IP multicast. Video on
demand is also considered for delivery over IP using a unicast
session model.
Providing simultaneous triple-play services over IP with unicast
video and multicast video, VoIP and data requires an architecture
that preserves the quality of service of each service. Fundamental to
this architecture is ensuring the video content (unicast and
multicast delivered to the user does not exceed the bandwidth
allocated to the user for video services. Architecture models often
ensure that data is guaranteed a minimum bandwidth and that VoIP is
guaranteed its own bandwidth. In addition, QoS control across
services is often performed at a Network Access Server (NAS), often
referred to as Broadband Network Gateway (BNG) for subscriber
management, per subscriber and shared link resources. Efficient
multicast video services require enabling multicast services in the
access network between the subscriber and the subscriber management
platform. In the FTTP PON environment, this implies enabling IP
multicast on the Access Node (AN) complex composed of the ONT and
OLT, as applicable. This is as opposed to DSL deployments where
multicast is enabled on the DSLAM only. The focus in this document
will be on the ANCP requirements needed for coordinated admission
control of unicast and multicast video in FTTP PON environments
between the AN complex and the NAS.
[ANCP-FRAMEWORK] provides the framework and requirements for
coordinated admission control between a NAS and an AN with special
focus on DSL deployments. This document proposes the extension of
that framework and the related requirements to explicitly address
BPON and GPON deployments.
.
2.1 Terminology
o PON (Passive Optical Network): a point-to-multipoint fiber to the
premises network architecture in which unpowered splitters are
used to enable the splitting of an optical signal from a central
office on a single optical fiber to multiple premises. Up to 32-
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128 may be supported on the same PON. A PON configuration consists
of an Optical Line Termination (OLT) at the Service Provider's CO
and a number of Optical Network Units or Terminals (ONU/ONT) near
end users, with an optical distribution network (ODN) composed of
f fibers and splitters between them. A PON configuration reduces the
amount of fiber and CO equipment required compared with point to
point architectures.
o Access Node Complex (ANX): The Access Node is decomposed by two
geographical functions, performed by OLT and ONU/ONT. The general
term Access Node (ANX) will be used when describing a
functionality which doesn't depend on the physical location but
rather on the "black box" behaviour of OLT and ONU/ONT.
o Optical Line Terminal (OLT): is located in the Service
provider's central office. It terminates and aggregates
multiple PONs (providing fiber access to multiple premises or
neighborhoods) on the user side, and interfaces with the
service element (NAS) providing subscriber management.
o Optical Network Terminal (ONT): terminates PON on the network
side and provides PON adaptation. The user side interface and
the location of the ONT is dictated by the type of network
deployment. For a Fiber-to-the-Premise (FTTP) deployment
(with Fiber all the way to the apartment or living unit), ONT
has Ethernet (FE/GE) connectivity with the Home Gateway
(HGW)/Customer Premise Equipment (CPE). In case of an MDU
(multi-dwelling or multi-tenant unit), a multi-subscriber ONU
typically resides in the basement or a wiring closet, and has
FE/GE connectivity with each CPE. In the case where fiber is
terminated outside the premise (neighborhood or curb side) on
an ONT/ONU, the last-leg-premise connections could be via
existing or new Copper, with xDSL physical layer (typically
VDSL). In this case, the Access Node (OLT & ONT together)
effectively is a "PON fed DSLAM".
o Network Access Server (NAS): Network element which aggregates
subscriber traffic from a number of ANs or ANXs. The NAS is often
an injection point for policy management and IP QoS in the access
network. It is also referred to as Broadband Network Gateway (BNG)
or Broadband Remote Access Server (BRAS).
o Home Gateway (HGW): Network element that connects subscriber
devices to the AN or ANX and the access network. In case of DSL,
the Home Gateway is a DSL network termination that could either
operate as a Layer 2 bridge or as a Layer 3 router. In the latter
case, such a device is also referred to as a Routing Gateway (RG).
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In the case of PON, it is often a Layer3 routing device with the
ONT performing PON termination.
o PON-Customer-ID: This is an identifier which uniquely identifies
the ANX and the access loop logical port on the ANX to the
customer premise, and is used in any interaction between NAS and
ANX that relates to access-loops. Logically it is composed of
information containing identification of the OLT (the OLT may be
physically directly connected to the NAS), the PON port on the
OLT, the ONT, and the port on the ONT. When acting as an
intermediate agent, the OLT can encode PON-Customer-ID in the
"Agent-Circuit-Identifier" Sub-option in Option-82 of the DHCP
messages.
3 Reference Architecture for PON Based Broadband Access Network
The reference architecture used in this document is based on Ethernet
aggregation for both of BPON and GPON. Specifically, the following
cases are addressed:
o BPON with Ethernet uplink to the BNG and ATM on the PON side.
o GPON with Ethernet uplink to the BNG and Ethernet on the PON
side.
In case of an Ethernet aggregation network that supports new QoS-
enabled IP services (including Ethernet multicast replication),
the architecture builds on the reference architecture specified in
DSL Forum [TR-101]. The Ethernet aggregation network between a NAS
and an OLT may be degenerated to one or more direct physical
Ethernet links.
Given the industry's move towards Ethernet as the new access and
aggregation technology for triple play services, the primary focus
throughout this document is on GPON and BPON with Ethernet between
the BNG and the OLT. Figures 1 and 2 depict an end-to-end
broadband network with PON access.
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Access Customer
<---------------Aggregation-------------> <- Premises ->
Network Network
+--------------------------+
| Access Node (ANX) |
+----------+ +-----+ +-----+ |+-----+ +-------+ | +---+
| | +-|NAS |-- |Eth |-|| OLT |--<PON>--|ONT/ONU|-|----|HGW|
NSP---+Regional | | +-----+ |Agg | |+-----+ +-------+ | +---+
|Broadband | | +-----+ +-----+ +--------------------------+
|Network |-+-|NAS | |
ASP---+ | | +-----+ |
| | | +-----+ |
+----------+ +-|NAS | | +--------+ +---+
+-----+ +-------<PON>--|ONT/ONU |---|HGW
| +--------+ +---+
|...............
| +--------+ +---+
+----|ONT/ONU |---|HGW|
+--------+ +---+
HGW : Home Gateway
NAS : Network Access Server
PON : Passive Optical Network
OLT : Optical Line Terminal
ONT/ONU : Optical Network Terminal/Unit
Figure 1. Access Network with PON
FE/GE or
+---------+ VDSL +---+
+-------------------+ | |------|HGW|
+----------+ +-----+ | +-----+ +------+ | | | +---+
| | +-|NAS |--| |Eth |--| OLT | |--<PON>--| | +---+
NSP---+Regional | | +-----+ | |Agg | | | | | |ONT/ONU |------|HGW|
|Broadband | | +-----+ | +-----+ +------+ | | | | +---+
|Network |-+-|NAS | +-------------------+ | | | .
ASP---+ | | +-----+ | | | +---+
| | | +-----+ | | |------|HGW|
+----------+ +-|NAS | | +---------+ +---+
+-----+ |
| +--------+ +---+
+----|ONT/ONU |-------|HGW|
+--------+ +---+
Figure 2. FTTP/FTTC with multi-subscriber ONU serving MTUs/MDUs
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3.1 Home Gateway
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K?Ë?ÚYÑKÝ?\?ÓÓ?U
K?H?TÈB?ON, it is often a Layer3 routing device with the
ONT performing PON termination.
o PON-Customer-ID: This is an identifier which uniquely identifies
the ANX and the access loop logical port on the ANX to the
customer premise, and is used in any interaction between NAS and
ANX that relates to access-loops. Logically it is composed of
information containing identification of the OLT (the OLT may be
physically directly connected to the NAS), the PON port on the
OLT, the ONT, and the port on the ONT. When acting as an
intermediate agent, the OLT can encode PON-Customer-ID in the
"Agent-Circuit-Identifier" Sub-option in Option-82 of the DHCP
messages.
3 Reference Architecture for PON Based Broadband Access Network
The reference architecture used in this document is based on Ethernet
aggregation for both of BPON and GPON. Specifically, the following
cases are addressed:
o BPON with Ethernet uplink to the BNG and ATM on the PON side.
o GPON with Ethernet uplink to the BNG and Ethernet on the PON
side.
In case of an Ethernet aggregation network that supports new QoS-
enabled IP services (including Ethernet multicast replication),
the architecture builds on the reference architecture specified in
DSL Forum [TR-101]. The Ethernet aggregation network between a NAS
and an OLT may be degenerated to one or more direct physical
Ethernet links.
Given the industry's move towards Ethernet as the new access and
aggregation technology for triple play services, the primary focus
throughout this document is on GPON and BPON with Ethernet between
the BNG and the OLT. Figures 1 and 2 depict an end-to-end
broadband network with PON access.
Bitar-Wadhwa Expires Jan 7, 2009 [Page 7]
Internet-Draft draft-bitar-wadhwa-ancp-pon-00 July 2008
Access Customer
<---------------Aggregation-------------> <- Premises ->
Network Network
+--------------------------+
| Access Node (ANX) |
+----------+ +-----+ +-----+ |+-----+ +-------+ | +---+
| | +-|NAS |-- |Eth |-|| OLT |--<PON>--|ONT/ONU|-|----|HGW|
NSP---+Regional | | +-----+ |Agg | |+-----+ +-------+ | +---+
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Ë ? HÔYÙH L×HB?B?[?\??] Q ?Y?)onality corresponds to the BNG functionality described in DSL
Forum TR-101. In addition to this, the NAS supports the Access Node
Control functionality defined for the respective use cases in this
document.
3.7 Regional Network
The Regional Network connects one or more NAS and associated Access
Networks to Network Service Providers (NSPs) and Application Service
Providers (ASPs). The NSP authenticates access and provides and
manages the IP address to Subscribers. It is responsible for overall
service assurance and includes Internet Service Providers (ISPs).The
ASP provides application services to the application Subscriber
(gaming, video, content on demand, IP telephony etc.). The NAS can be
part of the NSP network. Similarly, the NSP can be the ASP.
4 Motivation for explicit extension of ANCP to FTTP PON
The fundamental difference between PON and DSL is that a PON is an
optical broadcast network by definition. That is, at the PON level,
every ONT on the same PON sees the same signal. However, the ONT
filters only those PON frames addressed to it. Encryption is used on
the PON to prevent eavesdropping.
The broadcast PON capability is very suitable to delivering multicast
content to connected premises, maximizing bandwidth usage efficiency
on the PON. Similar to DSL deployments, enabling multicast on the
Access Node Complex (ANX) provides for bandwidth use efficiency on
the path between the Access Node and the NAS as well as improves the
scalability of the NAS by reducing the amount of multicast traffic
being replicated at the NAS. However, the broadcast capability on the
Bitar-Wadhwa Expires Jan 7, 2009 [Page 10]
Internet-Draft draft-bitar-wadhwa-ancp-pon-00 July 2008
PON enables the AN (OLT) to send one copy on the PON as opposed to N
copies of a multicast channel on the PON serving N premises being
receivers. The PON multicast capability can be leveraged in the case
of GPON and BPON as discussed in this document.
Fundamental to leveraging the broadcast capability on the PON for
multicast delivery is the ability to assign a single encryption key
for all PON frames carrying all multicast channels or a key per set
of multicast channels that correspond to service packages, or none.
It should be noted that the ONT can be a multi-Dwelling Unit (MDU)
ONT with multiple Ethernet ports, each connected to a living unit.
Thus, the ONT must not only be able to receive a multicast frame, but
must also be able to forward that frame only to the Ethernet port
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