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Provider Backbone Transport

Provider Backbone Transport. Alan Beard Dir Business Development 19 th November 2007. Triple play - DSLAM Connectivity. DSLAM. ATM DSLAMs. Data Business Services. Wireless Backhaul. What’s in common between…. Triple Play - Fibre To The Home. ?. ?. ?. ?. VPN Evolution.

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Provider Backbone Transport

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  1. Provider Backbone Transport Alan Beard Dir Business Development 19th November 2007

  2. Triple play - DSLAM Connectivity DSLAM ATM DSLAMs Data Business Services Wireless Backhaul What’s in common between… Triple Play - Fibre To The Home ? ? ? ?

  3. VPN Evolution 3RD GENERATION 1ST GENERATION 2ND GENERATION • Virtual LeasedLine (VLL) • ATM/Frame Relay • Shared bandwidth • Cost effective alternative to leased lines • Multiple connections create complex mesh • IP-VPNs • RFC2547 based • Connectionless • Hosted service • Layer 3 adds complexity • Ethernet VPNs • Any-to-any L2 connectivity • Cost effective alternative to L3 VPNs • Simple to manage and operate • Scalable bandwidth • Improved security through L3 transparency

  4. Network Layer Reduction (Metro) TODAY Layer 3 - IP Layer 3 – IP Layer 2 – Ethernet Layer 1/2 – Ethernet – PBB/PBT Layer 1.5 – GFP, LCAS, VCAT Layer 0 – Wavelength Layer 1 – SDH Layer 0 – Wavelength

  5. Video Data Service Provider Ethernet Solutions Point-to-Point EVC Ethernet as a Service • Offered and sold as connectivity • Aimed at Business Market Services • Ethernet VPNs • Ethernet Private Line • Ethernet Virtual Private Line • Ethernet Virtual Private LAN CE UNI CE UNI E-Line Service type Ethernet as an Infrastructure • Support of Residential and Business Services • Triple Play: Voice/Video/Data • Internet Access • Storage • Metro Aggregation • DSL Aggregation • Wireless Backhaul • Internet Access and IP VPNs Voice ASP

  6. Enterprise-class Ethernet Switches Lack Critical Service Provider Pre-requisites Ethernet as used today is lowest cost but has several issues: Lower Cost per Mbps Reduced CAPEX Reduced OPEX & Simplified OAM Higher Service Scalability & Flexibility Traffic Engineering Resource Reservation Dynamic Provisioning Differentiated Services Network Resiliency

  7. Nortel’s Carrier Ethernet Solution Carrier-class OAM Customer encapsulation (PBB/PWE) Guaranteed SLAs & determinism via PBT Keep Ethernet Simple & Cost Effective

  8. 3. Customer frame is transparently tunneled from UNI to UNI Ethernet Header 802.1ahHeader 802.1Q Tag Payload 2. Service Provider Q tag identifies customer Ethernet Header Outer Tag 802.1Q Tag Payload Ethernet Header 802.1Q Tag 1. Q tag identifies VLAN Payload IEEE 802.1ah Encapsulation Provider Backbone Bridging

  9. IEEE 802.1ah (PBB) Encapsulation Characteristics • Scalability • 16 million VPNs • Security • Clear demarcation between service provider and customer • Robust • Spanning Tree Protocol convergence in the customer network doesn’t affect service provider network • Service management • Service provider MAC provides an end to end service ID • Provided simple efficient Any to Any service

  10. Nortel’s Strategy • Ethernet switches are the telecommunications infrastructure with the lowest cost point • We can re-purpose these switches with new control software to meet carrier needs • This can be done with minimal changes to Ethernet standards and those changes are in progress • This can be done while preserving investment in service provisioning Keep Ethernet simple, flexible and cost effective

  11. Provider Backbone Transport (PBT) • A simple point-to-point Ethernet tunneling technology • Reserve bandwidth • Deliver hard QoS • Offer 50 ms recovery Trunk manager Traffic Engineered PBT trunks Carrier Ethernet Provides “SDH like” guaranteed performance & SLAs

  12. How Does PBT Work? • Turn off • Broadcast unknown • MAC learning functionality • Spanning Tree Protocol • Give control of the forwarding tables to the Provisioning system • Ethernet still switches based on forwarding table information Management Signaling/Control Forwarding/Data Reuses existing Ethernet hardware and cost points

  13. PBT Example • Normal forwarding using: destination MAC address + VLAN-ID(DA + VLAN-ID) • PBT reserves a subset of VLAN tags • VLAN tag is no longer globally unique Trunk manager Service and Network Management MAC-in-MAC encapsulation MAC-in-MAC encapsulation Customer Network Customer Network SA: PE1 Trunk defined by DA: PE3 + VLAN 45 Combination of VLAN tag and MAC address is unique

  14. PBT Example • Backup path can be configured for resiliency • Paths can use the same Destination MAC • Both paths are monitored by CFM control frames • active path forwards packets • if CFM measures active path down, switchover to backup in 50ms Trunk manager Service and Network Management SA: PE1 Trunk defined by DA: PE3 + VLAN 45 MAC-in-MAC encapsulation Customer Network Customer Network SA: PE1 Trunk defined by DA: PE3 + VLAN 44

  15. The End Result • Solves MAC learning problems • MAC Explosions, Service Scalability • New forwarding mode results in • Traffic engineering • Resiliency • Hard QoS • Comprehensive OAM • Ethernet OAM is on track to surpass MPLS OAM Low risk play…..reuses existing Ethernet switches

  16. Ethernet Services (EVPL, ELAN, ELINE, Multicast) MPLS Services (RFC 2547 VPN, PWs etc.) PBT • Keep existing Ethernet & MPLS services • Capitalize on Ethernet as transport for significant savings • Existing network-friendly solution! Nortel Technology Innovation: Provider Backbone Transport

  17. Back Up

  18. MPLS Dissected: 2 separate layers Customer Payload • MPLS provides a Service Layer • Revenue generating • L3 VPNS (2547), L2 VPNs (PWs, VPLS) • MPLS also provides a Tunnel layer • Provides networking functionality • Adds significant cost to your equipment and operations teams • Can we eliminate this layer of cost for metro transport? Yes! MPLS Service Layer MPLS Tunnel Layer Ethernet Header L1 Header

  19. Ethernet Surpasses MPLS: PW over PBT PWs PWs Customer Payload VF VF VPLS over PBT VPLS VPLS VSI VSI Pseudowire Service Label PBB over PBT PBB PBB I-SID I-SID MPLS Tunnel Layer Any Service! PBB (802.1ah) VPLS Ethernet Header PBT works with any service layer L1 Header The Virtues Of Tunneling PBT HEADER

  20. Ethernet OAM • 802.1ag gives: • Rapid notification of end-to-end connectivity failure. • Where is broken link? • MTU/priority-related faults → Faults found & fixed quicker & more easily. • Y.1731 measures: • Frame delay, delay variation, frame loss • AIS → Diagnostics/monitoring to support premium high-QoS services • Resiliency and Protection switching (ITU G.8031) • Provides 50ms protection switching • 802.1ab Autodiscovery → fast and accurate network topology view “SDH Like” simple operational paradigm - Functionality is on the box, EMS/NMS not involved

  21. EMS - Metro Ethernet Manager (MEM) Integrated Carrier Ethernet / Optical / MSS management platform

  22. PBT Standards • PBT architecture uses existing standards • The remaining areas are being addressed by the IEEE and ITU-T • IEEE approves work on PBT PAR (November 06) • IEEE working group launched Jan07. • G.pbt Provider Backbone Transport Architecture introduced in February 06

  23. PBT on target to be standardised in 2007 Standards Summary      

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