Transcript Intelligent Optical Networking for Flexible Ethernet

Intelligent Optical Networking for
Flexible Ethernet Lightpath Delivery in
Research Networks
TERENA 2007, Session 4B
Dr John-Paul Hemingway
Office of the CTO, Ciena
22nd May 2007
© Ciena Confidential and Proprietary
Agenda
Flexible Light Paths– What do we mean?
Single Domain Networking
UltrascienceNet Application Example
Multi Domain Interworking
Future Directions
OTN Networking
Connection Oriented Ethernet Networking
© Ciena Confidential and Proprietary
2
Research Networks
The Need for Flexible Lightpaths
Connectivity
Requirements
Guaranteed
Deterministic
Bandwidth (10s
Mbps – 10Gbps+)
Mulitple
Communities of
Interest
200Mb
ScheduledDemand
Bandwidth; Hours,
Days, Weeks
500Mb
10Gb
10Mb
SDH / IP/ Ethernet
1Gb (FC)
Low Latency
Data
Replication
Scarce Resources
Multi-site
correlation
High Availability
Data Collection
© Ciena Confidential and Proprietary
Data Crunching
Data Storage
3
Research Networks
Globalisation is a reality
Global, Multi-Domain
Connectivity
Service definition
across Protocol
boundaries
Service Creation
across domains
200Mb
10Gb
SDH
Data Collection
© Ciena Confidential and Proprietary
Network Element
Interworking
functions
10Mb
MPLS
Data Crunching
SONET
Data Storage
4
Domain Control Plane Technologies
PACKET SWITCHED
• Granular Bandwidth
CIRCUIT SWITCHED
• Deterministic
• Guaranteed Bandwidth
IP
• Bandwidth Sharing
Ethernet
• Statistical Multiplexing
• High Availability
Converged Ethernet-TDM
MPLS - GMPLS
GMPLS/ASON
SDH/SONET
WDM/Optical
© Ciena Confidential and Proprietary
5
Example Switched Network Infrastructure
UltraScience Net (USN)
4-Node Switched Network using
Ciena CoreDirector CI
Parallel OC-192 SONET links
Alternate Path over MPLS
Excellent Testbed Facility
Looped SONET XC to increase
effective Transmission Length
Comparison of IP performance
over EthoTDM and EthoMPLS
E2E VLAN Testing over
EthoTDM and EthoMPLS
Scripted B/W reservation
© Ciena Confidential and Proprietary
Courtesy of Nageswara S. Rao, Oak Ridge National Laboratory
6
UltraScience Net (USN)
1GbE mapped into OC-12c
Infiniband Storage protocol mapped
from IB Switch into OC-12c
OC-12c cross-connected into
mulitple loops
Longest effective length of 34400
miles (Around the Earth once)
Without performance
degradation of GbE
Infiniband over 8600 miles
Effective flat throughput
compared to back-back
© Ciena Confidential and Proprietary
7
Multi-Domain Control Planes
Key Points:
Two Main Options
within the Standards
Bodies
Client
Device
R&E Network A
R&E Network B
NE
NE
NE
NE
NE
NE
NE
NE
Client
Device
ASON (ITU-T
and OIF
extensions)
NE
NE
Challenges
R&E Network C
NE
Global Networking
GMPLS
(IETF)
NE
NE
Nodal
Interworking
Client
Device
Scalability
NE
Security &
Policy
NE
© Ciena Confidential and Proprietary
8
ITU-T ASON Control Plane Model
Key Points:
Multiple Domains
within a network
Client
Device
R&E Network A
UNI
I-NNI
NE SONET
NE
Client
Device
R&E Network B
E-NNI
NE
I-NNI
OTN
Common UNI and
E-NNI border
interfaces
Flexibility to
establish domain
boundaries
UNI
NE
Policy control over
the interfaces
between domains
E-NNI
E-NNI
Global Networking
Client
Device
R&E Network C
NE
I-NNI NE
SDH
ASON and
GMPLS control
planes can work
together
UNI
GMPLS
virtualized
networks
Domain GMPLS Virtual Node
E.g.
DRAGON
© Ciena Confidential and Proprietary
9
Standards Are Still Maturing
OIF
IETF
E-NNI Routing 1.0 Approved Jan’07
OSPF extensions for ASON
UNI 2.0 in progress
adds Ethernet, Connection
Modification and G.709 support
E-NNI 2.0 progressing in parallel
ITU-T
Signaling Specifications Stable
Routing extensions planned
Basic Specifications Stable
RFCs for basic signaling and routing
for GMPLS
Some extensions in progress
Joint work on OSPF extensions with
OIF and IETF members
Other work includes MPLS-GMPLS
integration, control of Ethernet and
PBB-TE, and Inter-domain signaling
and routing
Will be done jointly with OIF and
IETF work on OSPF
ASON management work in progress
G.7718.1 object model (Dec’06)
G.7716 control plane initialization
© Ciena Confidential and Proprietary
10
Control Plane Future Directions
©©Ciena
CienaConfidential
Confidentialand
andProprietary
Proprietary
11
Evolution of the Client-Server Network
IP
TDM
Voice
IP
SONET/SDH is
Managed Transport
“Server” layer for
existing service
“clients”
Alien
Wavelengths
IP
IP
Ethernet
ESCON
TDM
PL
FC
ATM
SONET
/SDH
IP builds over WDM
Ethernet
… so does Ethernet
… and ESCON, FC,
l services
OTN
WDM augments
SONET/SDH capacity
WDM
WDM
OTNisprovides
now an unmanaged
the necessary
network
Managed
“Server”
Transparent
to many
transport “Clients”
Service for
(which
all Transport
now includes
Clients
SONET/SDH)
Animated Slide
© Ciena Confidential and Proprietary
12
Emergence of Connection Oriented Ethernet
IP
IP
TDM
Voice
IP
Driven by Demand for
packet focused
replacement of SDH
Alien
Wavelengths
IP
Ethernet
ESCON
TDM
PL
Robust as SDH
FC
Less Complex than
MPLS
ATM
Less Costly than
either
SONET
/SDH
Connection oriented for
deterministic B/W
COE*
Disable MAC
learning,
Broadcast
Unknown, STP
OTN
Explicit Paths and
CAC for
guaranteed QoS
and Restoration
WDM
High Availability
Transparent L2
Aggregation
Mux Efficiency
*COE: Connection-oriented Ethernet
© Ciena Confidential and Proprietary
13
Optical Transport Network (OTN)
ITU Standards G.709 “Digital Wrapper”, G.872, G.873.1
Defines line/muxing rates, Optical Transport Unit (OTU)
ODU-1/2/3 payload in OTU-1/2/3 = 2.5/2.7Gbps, 10/10.7Gbps, 40/43.0Gbps
OTU-2 supports 10GbE LAN PHY (Extensions to include Preamble, Over-clocked for IFG)
OTN & SONET/SDH share same foundation
Similar framing with addition of OTN FEC
Powerful OA&M capabilities (GCC0 akin to DCC)
Asynchronous and Transparent
Services with different clock sources integrated side-by-side
Secure; Client OAM channels maintained
1
Overhead
for
OA&M
7 8 14 15 16 17
1
2
FAS OTU
3
ODU
4
© Ciena Confidential and Proprietary
O
P
U
Traffic Payload
Client Payload
3824 3825
4080
FEC
Forward
Error
Correction
14
FAS: Frame Alignment Signal
OTU: Optical Transport Unit
ODU: Optical Data Unit
OPU: Optical Payload Unit
Extension of Control Plane to OTN
OTN Electrical Signals
OPVC, ODU1, ODU2
Similar to SONET/SDH
Overhead bytes for monitoring, alarms, signaling (GCC)
Extension of control plane should be straight-forward
UNI-2.0 incorporating G.709 Interface definitions
© Ciena Confidential and Proprietary
15
Emerging COE Implementations
Two data plane implementation efforts are in progress
Ethernet-based: PBB-TE (Being defined by IEEE 802.1ah)
MPLS-based: T-MPLS (Being defined by ITU G.8110)
PBB-TE and T-MPLS are addressing the same problem in different
ways and promise to provide roughly equivalent results
PBB-TE is providing connection-oriented, deterministic behavior
to Ethernet
T-MPLS is integrating packet transport into transport equipment
Currently no clear “winner”
?
PBB-TE plans have been publicized by BT
T-MPLS standards are advancing in ITU
PBB-TE
© Ciena Confidential and Proprietary
16
T-MPLS
T-MPLS
“Transport – Multi-Protocol Label Switching”
T-MPLS is a “carrier-grade” packet transport protocol
Operated by Transport Layer Equipment (not Routers)
Architecture Standardized in ITU G.8110
Connection-oriented subset of IETF’s IP/MPLS
Any packet type supported (in principle)
Current focus on Ethernet
Consistent with existing transport networks
Convergence focus with OTN/WDM and SONET/SDH
Integration of packet transport requirements into existing
transport promises lower cost
Avoid cost associated with IP routing
© Ciena Confidential and Proprietary
17
PBB-TE
“Provider Backbone Bridging with Traffic Engineering”
PBB-TE is a connection-oriented enhancement to Ethernet
Based on IEEE’s “Provider Backbone Bridging”
standard 802.1ah
PBB Mac-in-Mac approach segregates provider networking
domain from end users
Transparent client connectivity
Packet forwarding is consistent with existing Ethernet
switching equipment
VLAN and Destination MAC Address
Aligns with high growth in Ethernet services
Use of existing Ethernet technology for transport promises
lower cost
Avoid cost associated with IP routing
© Ciena Confidential and Proprietary
19
PBB-TE differences from Ethernet
Predictable & deterministic Connection-oriented behavior
Switch off bridging, broadcast and STP on per VLAN basis
“Static” forwarding & connection provisioning
OSS-driven traffic and bandwidth management (incl. call admission
control)
Unique, Traceable & Scalable Address Space
Source MAC Address + Destination MAC Address + VLAN ID
16 million (theoretically)
New Ethernet OAM
Connectivity Fault Management: 802.1ag/Y.1731
Performance Management: Y.1731/MEF10
New Ethernet service protection
Ethernet 1+1/1:1 Automatic Protection Switching: G.8031
© Ciena Confidential and Proprietary
20
Extension of Control Plane to PBB-TE
G.ASON/GMPLS control plane is directly applicable to PBB-TE
Connection-oriented, point-to-point
ietf draft-fedyk-gmpls-ethernet-pbt-00.txt
GELS – GMPLS controlled Ethernet Label Switching
Network Scaling Not a Big Concern
Influenced by number of links in network not number of connections
Connection Restoration May be Challenged
PBB-TE has potentially a lot more connections to process than SDH/SONET
Speed is influenced by number of connections requiring simultaneous restoration
10G SONET  OC192 link / 51Mbps per connection =< 192 connections per link
10G PBB-TE  10GE link / 1Mbps per connection =< 10,000 connections per link
© Ciena Confidential and Proprietary
21
PBB-TE Tunnel Connection Setup
PBBTE
DB
Home, actual &
diverse route
connection
attributes state
information
Connection
attributes state
information
PBBTE
DB
Distributed
Database of PBBTE connection
attributes
PBBTE
DB
Includes home,
actual and
diverse route
information
Creation
CAC
SETUP
ASON/GMPLS
signaling
CAC
SETUP
(PROCEEDING)
Signaled tunnel
creation from OSS
CAC
Update forwarding
tables after path
confirmation
Update Fwd Table
(PROCEEDING)
CONNECT
Update Fwd Table
CONNECT
Update Fwd Table
© Ciena Confidential and Proprietary
22
Summary
Dynamic Lightpaths achievable through control plane networks
Circuit Switched networks provide robust infrastructure (USN)
Interoperation possible though ASON/GMPLS
Future Directions for Control Plane Networks
OTN for multi-service networks
COE for Ethernet focussed networks
GASON/GMPLS look applicable for both
© Ciena Confidential and Proprietary
23
Thank-you
Questions?
© Ciena Confidential and Proprietary
24