Nortel Confidential Information 1 Provider Backbone Transport Alan Beard Dir Business Development 19...
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Transcript of Nortel Confidential Information 1 Provider Backbone Transport Alan Beard Dir Business Development 19...
1 Nortel Confidential Information
Provider Backbone Transport
Alan BeardDir Business Development19th November 2007
2 Nortel Confidential Information
What’s in common between…
Triple play - DSLAM Connectivity
ATM DSLAMsDSLAM
Data Business Services Wireless Backhaul
?
??
Triple Play - Fibre To The Home
?
3 Nortel Confidential Information
> 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
3RD GENERATION
> IP-VPNs
> RFC2547 based
> Connectionless
> Hosted service
> Layer 3 adds complexity
2ND GENERATION
VPN Evolution
> Virtual LeasedLine (VLL)
> ATM/Frame Relay
> Shared bandwidth
> Cost effective alternative to leased lines
> Multiple connections create complex mesh
1ST GENERATION
4 Nortel Confidential Information
Network Layer Reduction (Metro)
Layer 0 – Wavelength
Layer 1/2 – Ethernet – PBB/PBT
Layer 3 – IP
Layer 0 – Wavelength
Layer 1 – SDH
Layer 2 – Ethernet
Layer 3 - IP
Layer 1.5 – GFP, LCAS, VCAT
TODAY
5 Nortel Confidential Information
Ethernet Solutions
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
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
Service Provider Voice
ASP
Data
Video
CE
CE
Point-to-Point EVC
UNI
UNI
E-Line Service type
6 Nortel Confidential Information
Enterprise-class Ethernet Switches Lack Critical Service Provider Pre-requisites
Existing Ethernet Challenges: Existing Ethernet Challenges:
Overlapping addresses; Secure separation & demarcation of
customers & provider
Service Scalability
OAM equivalent or better than current provider OSS systems
Traffic Engineering & QoS
Carrier-grade resiliency with bandwidth efficiency
Lower Cost per MbpsReduced CAPEX
Reduced OPEX & Simplified OAM
Higher Service Scalability & Flexibility
Traffic EngineeringResource ReservationDynamic ProvisioningDifferentiated Services Network Resiliency
Ethernet as used today is lowest cost but has several issues:
7 Nortel Confidential Information
Nortel’s Carrier Ethernet Solution
Guaranteed SLAs &
determinism via PBT
Carrier-class OAM
Customer encapsulation
(PBB/PWE)
Keep Ethernet Simple & Cost Effective
8 Nortel Confidential Information
IEEE 802.1ah EncapsulationProvider Backbone Bridging
Ethernet Header Payload
802.1Q Tag
1. Q tag identifies VLAN
EthernetHeader
OuterTag
802.1Q Tag
Payload2. Service Provider Q tag identifies customer
802.1ahHeader
EthernetHeader
802.1Q Tag
Payload3. Customer frame is transparently tunneled from UNI to UNI
9 Nortel Confidential Information
IEEE 802.1ah (PBB) Encapsulation
>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
Characteristics
10 Nortel Confidential Information
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 Nortel Confidential Information
Provider Backbone Transport (PBT)
> A simple point-to-point Ethernet tunneling technology• Reserve bandwidth• Deliver hard QoS • Offer 50 ms recovery
Provides “SDH like” guaranteed performance & SLAs
Carrier Ethernet
Traffic Engineered PBT trunks
Trunk manager
12 Nortel Confidential Information
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
Forwarding/Data
Signaling/Control
Management
Reuses existing Ethernet hardware and cost points
13 Nortel Confidential Information
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
Service and Network Management
SA: PE1Trunk defined by DA: PE3 + VLAN 45
CustomerNetwork
MAC-in-MACencapsulation
CustomerNetwork
Trunkmanager
MAC-in-MACencapsulation
Combination of VLAN tag and MAC address is unique
14 Nortel Confidential Information
Service and Network Management
CustomerNetwork
MAC-in-MACencapsulation
CustomerNetwork
Trunk manager
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
SA: PE1Trunk defined by DA: PE3 + VLAN 45
SA: PE1Trunk defined by DA: PE3 + VLAN 44
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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 Nortel Confidential Information
MPLS ServicesMPLS Services(RFC 2547 VPN, PWs etc.)(RFC 2547 VPN, PWs etc.)
Ethernet ServicesEthernet Services(EVPL, ELAN, ELINE, Multicast)(EVPL, ELAN, ELINE, Multicast)
> Keep existing Ethernet & MPLS services
> Capitalize on Ethernet as transport for significant savings
> Existing network-friendly solution!
PBTPBT
Nortel Technology Innovation: Provider Backbone Transport
17 Nortel Confidential Information
Back Up
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MPLS Dissected: 2 separate layers
1. MPLS provides a Service Layer• Revenue generating• L3 VPNS (2547), L2 VPNs (PWs, VPLS)
2. 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 Tunnel Layer
Customer Payload
MPLS Service Layer
L1 Header
Ethernet Header
19 Nortel Confidential Information
The Virtues Of Tunneling
PBT HEADER
PW over PBTVFVF
PWsPWs
VPLS over PBTVSIVSI
VPLSVPLS
PBB over PBTI-SIDI-SID
PBBPBB
Ethernet Surpasses MPLS:
MPLS Tunnel Layer
Customer Payload
PseudowireService Label
L1 Header
Ethernet Header
VPLS PBB (802.1ah)Any Service!
PBT works with any service layer
20 Nortel Confidential Information
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 Nortel Confidential Information
EMS - Metro Ethernet Manager (MEM)
Integrated Carrier Ethernet / Optical / MSS management platform
22 Nortel Confidential Information
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
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Standards Body
Standards Project Approved Draft Under Discussion
802.1AB Discovery
802.1ad Provider Bridges
802.1ag Connectivity Fault Management
802.1ah Provider Backbone Bridges
Y.1731 Ethernet OAM Mechanisms
G.8031 Ethernet Protection
Standards Summary
PBT on target to be standardised in 2007
24 Nortel Confidential Information