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Overview of WP3/13
WP3/13;
Multi-protocol Networks and Mechanisms
May 14, 2001
WP3 Chaiman; Yoichi Maeda (NTT, Japan)
Email; maeda.yoichi@lab.ntt.co.jp
SG13 Caracas Seminar
Questions in WP3/13
Question２/13：
ATM layer and its Adaptation (AAL)
Rapporteur;
Mr. K. Ahmad (Nortel Networks)
Question ３/13：
OAM and Network Management in IP-Based and Other
Networks
Rapporteur;
Mr. H. Ohta (NTT)
Question 11/13：
Mechanisms to Allow IP-Based Services Using MPLS
to Operate in Public Networks
Rapporteurs; Mr. M. Carugi (FT)
Mr. S. Shimizu (Hitachi)
SG13 Caracas Seminar
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Q.2 ; Issues on ATM
• ATM layer has been mostly completed in past study periods
and is in a stable condition in Recommendations I.150 and
I.361
– I.150; B-ISDN ATM functional characteristics
– I.361; B-ISDN ATM layer specification
Key issues
• ATM layer capabilities to support multicast services and
other point-to-multipoint, multipoint-to-point, multipointto-multipoint services.
• Potential additional pre-assigned ATM cell header values
SG13 Caracas Seminar
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Q.2 ; Issues on AAL
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 Much of the work on ATM Adaptation Layer (AAL) specifications
has been completed in past study periods. Specifications have
been prepared for AAL Types 1, 2, 3/4 and 5 together with a
number of service specific convergence sublayers (SSCSs).
 I.363.x; B-ISDN AAL specification: AAL Types
 I.366.x: Segmentation and Reassembly SSCS for
AAL types
Key issues
 New or enhancements to existing Recs. for AAL types:
 AAL type 1 for interworking between AAL type1 and AAL
type2
 ATM layer transfer capabilities and QoS suitable for particular
AAL protocols, etc.
SG13 Caracas Seminar
Q.3 : Issues on OAM for IP-based NW
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OAM and protection switching issues of IP-based
networks are to be considered to protect small numbers
of premium services which rely on high reliability when
multiplexed with a large number of unprotected services.
Key issues
New draft Recommendations are expected to be
consented in Caracas meeting
Y.17oam.1: OAM functionality for MPLS networks
Y.17ps: Protection switching for MPLS networks
SG13 Caracas Seminar
Q.3 : Issues on OAM enhancements
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The OAM aspects for ATM layer have been enhanced in the study
period 1997-2000
 I.610 : B-ISDN OAM principles and functions
 I.630 : ATM protection switching
Key issues
Enhancement of I.610; OAM studies of AALs and other
evolving link layer management, and OAM functions for Pointto-Multipoint connections
Enhancement of I.630; Protection aspects on 1:n and m:n
protection configuration, semi-dedicated protection, ATM ring
protection, performance of protection switching and protection
against signal degrade
SG13 Caracas Seminar
Q.11 : Multi-protocol mechanisms
 Recommendation Y.1310 selected MPLS as the preferred
architecture for IP transport over ATM
Y.1310: Transport of IP over ATM in Public
Networks
Key issues
 mechanisms to support QoS-aware IP services in MPLS based
networks.
 mechanisms for transport of IP diffserv (and intserv) over MPLS
based networks
 mechanisms to support each identified additional IP-based
service over MPLS networks
e.g. Voice over MPLS; Liaison from MPLS Forum
 requirements and mechanisms for IP-VPN service
SG13 Caracas Seminar
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Q.11 : Definition of IP-VPN
A network infrastructure delivering private network
services over a public infrastructure.
VPN
Public network
(Internet, FR, ATM, etc.)
VPN has become a hot issue, one of the new “killer application”
of the IP based network, a $24B business.
(Source: CIMI Corp.)
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Q.11 : Issues on IP VPN
 A number of IP VPN proposals in the market
 would like to define common requirements
 Interoperability towards multi-vendor environments
 would like to define applicability scenarios for the various
solutions
 integration of Service Provider added-value requirements
Two draft versions of Recommendations on IP VPNs have been
produced up to now
Y.1311 “Network based IP VPN Service - Generic
framework and service requirements”
Y.1311.1 “Network based IP VPN over MPLS
Architecture” (expect to be consented in Caracas)
SG13 Caracas Seminar
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Q.11: Further study issues on VPN
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 Ensure scalability over the next several years
 Flexibility to accomodate future requirements
 non-IP services over the same VPN
- e.g. ATM/FR/SDH/Ethernet over MPLS
(L2 VPN)
 Layer 1 VPNs (optical VPN)
 Interoperability scope
 Segmentation of the service offer
(Carrier/Service Provider VPNs vs Enterprise VPNs)
 Necessity of the synergy is identified to ensure mutual
exchange, cooperation and progress between ITU-T (Y.1311.1)
and IETF (PPVPN)
SG13 Caracas Seminar
Conclusion
WP3/13 will study multi-protocol networks
and mechanisms to deliver high-quality and
reliable networking.
Muchas gracias !
SG13 Caracas Seminar
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