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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

Provider Backbone Transport

Alan Beard

Dir Business Development

19th November 2007

what s in common between

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
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
network layer reduction metro
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

ethernet solutions

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

enterprise class ethernet switches lack critical service provider pre requisites
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

nortel s carrier ethernet solution
Nortel’s Carrier Ethernet Solution

Carrier-class OAM

Customer encapsulation (PBB/PWE)

Guaranteed SLAs & determinism via PBT

Keep Ethernet Simple & Cost Effective

ieee 802 1ah encapsulation

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

ieee 802 1ah pbb encapsulation
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
nortel s strategy
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

provider backbone transport pbt
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

how does pbt work
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

pbt example
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

pbt example1
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

the end result
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

nortel technology innovation provider backbone transport

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
mpls dissected 2 separate layers
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

the virtues of tunneling

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

ethernet oam
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

ems metro ethernet manager mem
EMS - Metro Ethernet Manager (MEM)

Integrated Carrier Ethernet / Optical / MSS management platform

pbt standards
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
slide23

PBT on target to be standardised in 2007

Standards Summary

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