International Telecommunication Union
The Future Packet-Based
Network – Issues &
Questions
Keith Dickerson
Head of Standards, BT
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
Scope
ITU-T
o Problems with Current Transport Layer
Protocols
o FPBN Requirements
o FPBN Architecture
o Questions
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
2
Problems with current transport
layer protocols
ITU-T
o Need to support different traffic types
o Need to protect control and management planes from
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dates
user-plane traffic
Need to guarantee and charge for Service Level
Agreements
Need to ensure emergency services get through
Need to provide adequate security
Need to identify and locate faults
Need to monitor performance
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
3
FPBN Requirements (1)
ITU-T
The FPBN shall:
o provide both connectionless & connection-oriented
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dates
services
support both public and private network services
support an appropriate range of QoS including best
effort and guaranteed services
allow a smooth migration from current cl-ps and cops networks
interwork with current cl-ps and co-ps networks
support arbitrary network topologies
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
4
FPBN Requirements (2)
ITU-T
o secure, protect and transport customer traffic as
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dates
appropriate to the requirements of the service
detect, and recover from, facility and equipment
failures and performance degradation
offer comprehensive OAM functions for each plane
secure the internal control and management plane
traffic from attack
offer performance and behavior isolation between
different traffic sources and types
support lawful intercept
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
5
FPBN Requirements (3)
ITU-T
o be able to monitor the traffic conditions and bill for
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dates
the service delivered
be able to distinguish between urgency and
importance
support services that require in-order delivery of
packets
support out-of-band control and management planes
attempt to keep traffic flowing while recovering from
failures
only deliver traffic from the intended source to the
intended destination(s)
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
6
FPBN Architecture?
ITU-T
Traffic goes either CL-PS
or CO-PS depending on
service
CL-PS core
OOB control/management
CO-PS core
OOB control/management
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
7
Virtual Router
ITU-T
V
Virtual Router
V
Resource Partition
V
V
V
UNI
V
V
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UNI
V
V
per Class Routing/Queuing
V
V
V
V
V
Physical Router
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
8
Questions
ITU-T
o Can FPBN provide QoS cost-effectively for all
services?
o Can FPBN provide security cost-effectively?
o How will the FPBN interwork with MPLS?
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
9