Evolution from ring-based SONET transport using APS protection to mesh-based DWDM transport.
Access – Support legacy and new forms of access migrating to Ethernet
Frame, ATM, TDM need to be supported, but will be pushed to the edge and aggregated into the packet network.
Ethernet is the new access allowing for network convergence and significant savings.
Network - A QoS Enabled IP/ MPLS Network Provides Service Convergence.
Multiple overlay networks can be supported on a single core infrastructure, significantly reducing capital and operating expenses.
Many levels of logical groupings possible - Virtual Private LAN Services ( VPLS ) and IP Virtual Private Networks ( VPNs ), Logical Routers..
Aggregate forwarding in the core allows for significant scalability over traditional technologies.
Class-based queuing in conjunction with MPLS allows for QoS-differentiated service offerings, and quick failure-recovery.
Applications – Based on an IMS and IPTV infrastructure overlaid on top of the packet network.
Core Architecture Target Applications Packet Optical Transport Platform Converged Packet Switch / Router Service Delivery Platform IMS Core; IPTV Core Next Gen Elements MPLS IP Network Apps Mesh and Ring DWDM SONET, EPL PBB, VPWS G.709 (OTN)
FTTP -- MASS-MARKET BROADBAND ACCESS Optical Splitter Central Office Customer Premises ONT Optical Coupler (WDM) Super Head End (SHE) EDFA OLT Bandwidth BPON Downstream: 622 Mbps Upstream 155 Mbps EDFA – Erbium Doped Fiber Amplifier OLT – Optical Line Terminal ONT – Optical Network Terminal
Industry Moving Towards GPON Systems
Doubles, Or Quadruples, Bandwidth
Enables Full IPTV Implementation
Uses Same Fiber Plant Design
Overlay Wavelength Decision (Vs. IPTV)
GPON 1.2Gbps/2.4 Gbps 622Mbps/1.2 Gbps Third Wavelength Is Optional IP/MPLS Network Internet VoIP Services PSTN/SS7 Network IP Video Services
Consolidate traffic types into a single network
Reduce total number of network elements
Reduce number of optoelectronic conversions between ingress and egress points
Eliminate unnecessary regeneration in the network
Integrated Multi-Service And Multi-Functional Elements in Metro
Service integration by providing full support for TDM/SONET/SDH, IP, Ethernet, ATM, and MPLS interfaces
Integration of aggregation, adaptation, switching, routing, and transport in A high-performance, cost-effective design
Transparent Optical Core
ROADM and WXC Platforms in Core Network
Mesh Topology – Dedicated Protection
Optical Network Convergence Strategy
The Core Optical Network Nationwide 10 Gbps Per Wavelength Network (40G Ready) Supporting Mesh Topology Re-Configurable Optical ADM (ROADM) 3000 – 4000 Km Reach without regeneration Optical Cross Connect (OXC) Wavelength Cross Connect (WXC) Collector Rings Signaling Communication Network GMPLS Signaling and Routing Messages Broadband Service Control Point CPC CPC CPC CPC CPC
Packet Network Convergence Strategy
Reduce number of routers and interfaces to decrease Capex/Opex
L2 access network backhauls traffic to converged edge/aggregation routers
Multiple services supported via a converged edge/aggregation router
New services enabled by deploying new cards rather than new platform deployment
Common platforms enable convergence of testing, operations and OSS Development for different business units
Eliminate service specific networks, but maintain diverse customer access with unified access into the VZ packet network
Converge the backbone network and maintain logical networks based on class of service sets rather than individual service
Maintain logical control and capacity separation between service sets (e.g., public, private)
Strategic Packet Network Architecture LEC TDM CPS L2SW TDM Ethernet GPON GPON Ethernet FR/ATM TDM ADSL DSLAM Metro Private Line CPA BEAS NGOLT ROADM Net Ethernet CPA BEAS LEC Ethernet Access NGEAR CBBR MSE In Footprint Access Out of Footprint Access Verizon Business NG VoIP, Enterprise Services Other VPNs Internet External Networks Verizon Telecom Next Gen Edge/ Aggregation Router Converged Back-Bone Router Multi-Service Edge Router NG VoIP, Consumer Services Optical Legend: Metro Fiber ATM NG-GWR VoD/ IPTV FR/ATM FR/ATM Under Study CPA L2SW Ethernet Switch SES VZ Wireless WAN Lambda
Packet Network Convergence
Target Packet Network Characteristics
Uses MPLS VPNs and PseudoWires for service domain and customer differentiation.
Implements QoS to provide differentiated treatment of traffic types.
Stable platforms and network resiliency mechanisms to provide PSTN-”like” availability.
IS-IS is the IP topology construction technology.
MPLS is the transport technology.
LDP is the initial MPLS signaling technology, with RSVP-TE phased in.
BGP is the VPN membership discovery technology.
DiffServ combined with MPLS traffic engineering is used to provide end-to-end QoS across multiple domains.
NEs at the boundaries of a domain perform traffic control functions (e.g., policing, marking, MPLS COS mapping).
Interior NEs perform bandwidth management functions (e.g., aggregate queuing, WRED).
Convergence Enablers -- Router Design
Carrier class routers emerging at last !
Higher capacity, high availability, multi-chassis, diversity of service cards
Software Process Separation
Multiple routing processes run on the same physical processor with operating system limits placed on key parameters
Logical Interface Allocation
Each logical interface (e.g., DLCI, VLAN) can be owned by a separate process
Hardware Processor Separation
Each routing process runs on a physically separate processor
Fast Failure Detection (e.g. BFD)
Non-stop forwarding via graceful restart or hot routing/signaling redundancy
Class-based queuing, scheduling, policing and shaping
MPLS bandwidth reservation
Convergence Enablers -- Hardware and Protocols
High-performance Ethernet Forwarding Hardware
High-speed, cost-effective interfaces
QoS capable, policing, shaping per logical interface
Supports link aggregation, protection switching, OAM
Ethernet-capable Optical Equipment
New generation of optical aggregation and switching elements have Ethernet and MPLS processing capability
Tunnel-based Traffic Engineering and Constrained Routing
MPLS support currently available
Ethernet-based tunneling may be an expected future standard
Recent Multi-Segment Pseudowire (MS-PW) signaling and routing standard provides scalability and inter-provider interconnection
MS-PW protection and diversity routing being standardized as well
Logical Router Technology – Separation/Allocation Traditional Router Switch Forwarding Cards Processor Routing Process Physical Interface Logical Interfaces Software Separation Single Processor Multiple Routing Processes Hardware Separation Multiple Processors Multiple Routing Processes Logical Interfaces Multiple Routing Processes Logical Interface Allocation Multiple Routing Processes Forwarding Card Allocation Distributed Processing Router Multiple Processors Single Routing Process Sub- Processes Most Separation, Highest Cost Good Separation, Higher Cost Hardware Separation Some Separation, Least Cost Some Separation, Least Cost Software Separation Forwarding Card Allocation Logical Interface Allocation
Ethernet and MPLS Aggregation in the Access Network LEC TDM L2SW Ethernet GPON NGOLT BEAS In Footprint Access Out of Footprint Access Verizon Business Verizon Telecom Ethernet Switch L2SW L2SW L2SW External Networks Ethernet Network MS-PW L2VPN On-net Fiber Internet Access L3VPN Internet Access L3VPN MS-PW Segment Endpoint Tunnel Tunnel Legend MS-PW Segment NGEAR MSE Open Third Party Interface