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Presented by

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Tata Communications’ Ethernet Evolution

PBB Technical Presentation

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• A universal protocol understood by all IT professionals

• Greater flexibility allows faster upgrades with no interruptions to the network

• Customers now only have to plan 30 days in advance using Ethernet, instead of months in advance using other technologies

• Customer trusts using Layer 1, however, needs latency or jitter or packet loss SLA guarantees, available with Ethernet

• Purchase the exact bandwidth required

• Lower port costs and greater port flexibility

Why Ethernet is growing?

WAN Ethernet 2

Lower costs

Data SLA’s with L1 confidence

Easy Scalability and Reduced Risk

Familiarity

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MEF 9 and MEF 14 certified services• Priority Ethernet (all configurations)

• Dedicated Ethernet (all configurations)

Owned cables• Enables Tata Communications to sell

up to 10 Gig Ethernet

• More control because Tata Communications controls everything down to the cable

Power of choice• More services: Point to Point, Point

to Multipoint, Multipoint

• More variety• CoS or Transparent Pipes;• Ring protection or mesh

protection; • Standard 1518 byte frame sizes

or 9000 byte (jumbo) frames

India Presence and Global reach• 120+ PoPs and extensive fiber

built in major cities

• Largest Global Footprint

What makes Tata Communications’ Ethernet Offering unique?

Market Leader

WAN Ethernet 3

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• Global Dedicated Ethernet ( GDE)

• National Dedicated Ethernet ( NDE)

• Global and National Priority Ethernet

• Global Priority Stretch

• 10 Gig-E Service

WAN Ethernet Portfolio

Point to Point Point to Multipoint

• Global and National Priority Ethernet

Multipoint

• VPLS

• Dedicated Multipoint

Options

• Enterprise SLA Option (ESO)

• Sub 10 Gig Ethernet

• Low Latency

• Protected ports

• Dual local loops

• Burstability

New

WAN Ethernet

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Global Ethernet Network

WAN Ethernet

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Why Next Generation Ethernet (NGE)?

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• Multipoint services are predicted to make up 40% of the total demand in 5 years

• Greater service (e.g., MAC, BW and services) scalability to address increasing customer demand

• Improve OAM capability to monitor and maintain services proactively

• Consistent services on a converged network

• Enhance ENNI capability

• More granular traffic manageability

WAN Ethernet

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Carrier Ethernet with IEEE 802.1ad – Present Technology

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• Key for customer traffic separation and network traffic engineering

• Multipoint services based on VLAN switching

• Contains broadcast functions like unknown unicast flooding and multicast/broadcast propagation

Problem : The Service Provider still has to use a customer’s MAC addresses to learn and switch traffic through their network. This causes large MAC tables in the SP core and also makes the core susceptible to DoS (purposely flooding the network with Ethernet frames to fill learning tables).

WAN Ethernet

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IEEE 802.1ah (PBB) is a Natural Ethernet Progression

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B-DA(6B)

B-SA(6B)

BTAG E-type0x88a8/0x81

00(2b)

BTAG-TCI(2B)

ITAG E-type0X88e7

(2B)

ITAG-TCI(4B)

Client Data B-FCS

VID(12 bits)

DEIPCP

(3 bits)PCP

(3 bits)DEI

RES(2 bits)

I-SID(24 bits)

BTAG TCI Format ITAG TCI Format

22 Bytes

PCP – 3 bits of PriorityCFI – 1 bit Canonical

Format IndicatorDEI – 1 bit Drop Eligibility

IndicatorRES – 2 bits ReserveI-SID – 24 bits Service IndicatorC-DA – encapsulated customer DAC-SA – encapsulated customer SAVID – VLAN IdentifierTCI – Tag Control InformationFCS – Frame Check Sequence

Another VLAN, called a Backbone VLAN (or B-VID), is responsible for defining the Backbone domain. The B-VID is the “highway” all B-MACs travel on; no B-VID, no PBB connectivity.

Greater scalability is also provided using a larger Instance-Service ID, or I-SID instead of a VLAN. When a customer’s frame (with or without C-VID) or SP’s S-VID enters the PBB domain, it is assigned and equated to one of the 16.7 million available I-SIDs.

To solve the MAC address problem, (customer MAC addresses in SP network), PBB’s encapsulation method adds another level of MAC addresses to forward traffic through an Ethernet-switched network. This new level of MAC addresses, called Backbone-MACs (or B-MACs), exist and function ONLY within a PBB domain and are simply the “backbone” facing switch ports.

WAN Ethernet

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• TDM • VPLS/H-

VPLS• MPLS-TP • PBB

How PBB was chosen for the core of Next Generation Ethernet (NGE) network?

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Technology Options for core network and metro

There is significant benefit to deploy the same technology between core and metro

• Robust network interconnection between core and metro• Monitoring and OAM capability throughout the network end-to-end • Flexible traffic management capability end to end• Ability to monitor each individual service and provide improved SLAs

WAN Ethernet

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How PBB Was Chosen for the Second Generation Tata Communications’ Ethernet Network?

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There is significant benefit to deploy the same technology between core and metro

• Robust network interconnection between core and metro• Service and MAC scalability throughout the global network• Ability to monitor each individual service and provide improved SLAs • Monitoring and OAM capability throughout the network end-to-end

Time-To-Market -PBB is a mature and standardized (802.1ah) technology.-Tata Communications required a mature technology for its global network.-Tata Communications decided not to wait a few more years for other technologies to mature.

• Tata is working with vendors to develop a “thin” control plane; e.g., Shortest Path Bridging• PBB will stay as a long-term solution with multiple applications. Many vendors are working to enhance/include the

technology in their product portfolio. PBB and MPLS-TP will coexist.

WAN Ethernet

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Tata Communications PBB Network Uses Cisco ASR 9000

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Initially, the switch capacity is 640G, 180G/slot, 512,000 MAC Addresses

• Hardware upgradable to • 3.2T, 400G/slot, • 1,000,000 MAC

Addresses

Tata Communications has chosen the “Cisco ASR 9000” for the Second generation Carrier Ethernet core network

• ASR 9010 with 10 slots or ASR 9006 with six slots

• Line cards are either: 8x10GE (WAN or LAN) or 40xGE

• Full port capacity/Non-blocking/No need for oversubscription

Cisco ASR 9000 uses the new IOS-XR release 3.9.1+ (and later) to support PBB

• Both HW and SW are optimised to support PBB

WAN Ethernet

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• Global connections• Inter-region connections• Regional to core connections

Hierarchical Network Architecture

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Hierarchical network topology consists of:

Protection within the Core

• Layer 1• Link aggregation• MSTP/ MST-AG – contained within

region

Protection between regional and core networks

• Link Aggregation• Dual homing using MSTP/ MST-AG

Creating regional protection groups in a global network

• Use regional B-MAC addressing scheme

• Use Access Control List for global loop avoidance

WAN Ethernet

Steve

"sub sea" correct?

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Global Double Ring Architecture

• Dual nodes in each region provide nodal redundancy to regional feeder networks

• Regional MSTP with simple topology makes performance predictable• Global MSTP makes network

performance unpredictable - conversion time for protection

• MSTP flooding is supported for different regional MSTP entities, which keep the different regions separate

WAN Ethernet

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Tata Communications - NGE International Physical Connectivity

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• Core nodes around the globe with a minimum of two nodes per continent

• Cables with lowest latency selected for Core-Core and Regional-Core connections

• Regional nodes connect to multiple Core nodes

WAN Ethernet

Steve

??? Not sure what this comment means. Not intended for text edit but for the diagram?

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Tata Communications – NGE Resilient Network

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C1 – Site BC1 – Site A

Failure

LAG protects against failures between Core and

Regional

Tertiary protection via L2 Protocols (MSTP/MSTP-AG)

Nodal Failure

Nodal Resiliency for Pass-Through Traffic(MTSP/MST-AG)



Nodal Failure

C2 – Site B C2 – Site AC3 – Site B C3 – Site A

Double Failure

WAN Ethernet

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DUAL Homing Scenarios – Interconnection with Aggregation Network

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•MSTP at the aggregation node

•MST-AG at ASR

•MC LAG - Future

WAN Ethernet

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MAC Address Learning in PBB – Additional Security

• Learns and forwards based on B-MAC addresses only

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Edge Bridge Domain (EBD): Core Bridge Domain (CBD):

• Learns and forwards based on customer MAC addresses

• Maintains a forwarding MAC table of C-MAC/B-MAC relationship

• Performs PBB encapsulation

WAN Ethernet

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Ethernet Service Mapping and Bundling

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• S-VLANs from access/aggregation mapped or bundled into I-SIDs on EBDs • I-SID provides service identification in PBB network• I-SIDs bundled into B-VLANs for transport over PBB core• B-VLAN defines transport topology in PBB network • Both I-SIDs and B-VLAN are statically preconfigured for traffic engineering purpose

WAN Ethernet

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Tata Communications Carrier Ethernet Roadmap

Near term additional features• Layer 2 linear protection using G.8031• Layer 2 ring protection using G.8032• Dual homing using MC LAG• Seamless access/metro/regional/core global

network

Long term vision• Control plan• Converged transport network

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Not all problems have a technological answer, but when they do, that is the more

lasting solution

- Andrew GroveCofounder of Intel

““

WAN Ethernet

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PBB – a Better Ethernet Network For Your Future

• PBB is a mature technology being adopted by many equipment vendors• PBB solves many scalability issues existing on today’s equipment • PBB enhanced network security

• Tata Communications has adopted PBB for its global network to deliver better services to our customers

• More flexibility– Pick your path– Deterministic protection

• Higher quality– Monitoring the customer service independently– Nodal diversity

• Expanding service options– Burstability– Sub 10 Gig E (1,000–10,000 Meg in 500 Meg increments)– Dual local loops

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As we go forward, I hope we’re going to continue to use technology to make really big differences in how people live

and work

- Sergey BrenCofounder of Google

““

PBB is a future-proof technology, and the

Future is Now!

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Next Generation Ethernet will benefit our customers

How do customers benefit?• Higher quality: Global Core layer delivers 99.995% availability

• Nodal Diversity: Global Core layer designed to protect against complete nodal failure

• More features:

• Sub-10 Gig E allows bandwidth flexibility between 1,000 – 10,000 Meg

• Shortest path, global multipoint services for delivering the best global LAN

• Low latency network for latency sensitive applications

• Protected ports for higher availability

• Dual local loops for higher availability

• Burstable service to handle unexpected surges in usage for greater flexibility

• Deterministic protection as an alternative to mesh

• Security to ensure data is only viewed by the intended audience

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WAN Ethernet

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Other benefits of the Next Generation Ethernet

• Multipoint• Global Ethernet Market in 5 years = $40 Billion• 40% of service provider business expected to be Multipoint• PBB (802.1ah) is a multipoint technology• Is the most efficient Ethernet technology for delivering multipoint

• Scalability is greater• 16.7 Million services• 240 Gig per box

• Greatly reduced cost structure• Nodal diversity

• Layer 1• Link aggregation• MSTP/ MST-AG – contained within region

• Strong roadmap• G8031 for greater path flexibility• Service level monitoring

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WAN Ethernet

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Tata Communications vs. Other Providers

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Largest “on-net” footprint

Award Winning Service

Cutting edge technology

delivering cutting edge services

High qualityGlobal presence, Cable ownership

Customer premise to Customer

premise monitoring

WAN Ethernet

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Thank You

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39WAN Ethernet

Email us: [email protected] Visit us: www.tatacommunications.com/vpn/pbbknowledgecentre.asp

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