1sp latin america © 2001, cisco systems, inc. all rights reserved. metro ethernet l2 & l3...

1SP Latin America © 2001, Cisco Systems, Inc. All rights reserved.

Metro Ethernet Metro Ethernet L2 & L3 L2 & L3 ArchitecturesArchitectures

Paul [email protected]

mailto:[email protected]

AgendaAgendaAgendaAgenda

Market Market DynamicsDynamics

Market Market DynamicsDynamics

StandardsStandardsStandardsStandards

Metro Ethernet ServicesMetro Ethernet ServicesMetro Ethernet ServicesMetro Ethernet Services

Metro Ethernet Control Metro Ethernet Control PlanesPlanes


Summary Summary Summary Summary

Infrastructure & Technology Infrastructure & Technology OptionsOptions


SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 333

AccessAccess Metro NetworkConnects Customers

to Services

Metro NetworkConnects Customers

to Services

AccessAccess Metro NetworkConnects Customers

to Services


to Services

AccessAccess

Service POPService POP

Co

re R

ou

tin

gC

ore

Ro

uti

ng

Ed

ge

Ro

uti

ng

Ed

ge

Ro

uti

ng

Gro

om

ing

Gro

om

ing

Service Adaptationand Packet Switching


Core TransportInterconnects PoPs

Core TransportInterconnects PoPs


to Services


to Services

AccessAccess

Service POPService POP

Co

re R

ou

tin

gC

ore

Ro

uti

ng

Ed

ge

Ro

uti

ng

Ed

ge

Ro

uti

ng

Gro

om

ing

Gro

om

ing



Control Planes and Network Management Integration

The Service Provider Transport Network Architecture

• SDH• Mesh• DWDM• IP/MPLS POS

• VPNs• QoS• App Hosting• Content Hosting

• Web Hosting• Voice over Packet• Packet Transport

Packet Services:Packet Services:• DSL• Fixed Wireless• Frame Relay• ATM• Leased Lines• Cable• Ethernet

• SDH• DWDM• IP/RPR• Gig Ethernet

The Services Bandwidth BarrierThe Services Bandwidth Barrier

Cu

sto

me

r N

etw

ork


Issues Facing Subscribers and Network Operators in the First Mile

• Basic net structure is TDM and 64k bandwidth increments

• Need flexible bandwidth, just-in-time provisioning

• Multiple types of NEs

• Need to support new services, generate revenue

Network OperatorsNetwork Operators

Subscribers: Business and ResidentialSubscribers: Business and Residential

• Access is still slow

• Too much hand-holding, provisioning takes days

• Few bandwidth options: kilobit, E1, or E3, nothing in between

• If there is no service, subscribers don’t need higher bandwidth


Economic and Standard Driver

10

100

1.000

10.000

100.000

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005

$/P

ort

/Mb

ps/

Mo

nth

SDH

ATM

GE

Souce: BCR Sept, 2000 by Peter Sevcik, NetForecast, Waltham, MA

Cost of delivering bandwidthCost of delivering bandwidth

• LAN applicationsLAN applications

• MAN applicationsMAN applications

• WAN applicationsWAN applications


End Customer Benefits from 1M to 100M

0

20

40

60

80

100

120

140

160

0 20 40 60 80 100

Customer Need (Mbps)

Se

rvic

e (

Mb

ps

)

• Flexibility & ChoiceWide choice of bandwidths

Pay for what you need

Keep your equipment and change bandwidth

EthernetEthernet

Legacy TDMLegacy TDM

Two Network Infrastructure Changes;Two Customer Equip Interface Changes

One Network Infrastructure ChangeOne Customer Equip Interface Change


US Metro Ethernet Services Opportunity

0

500

1000

1500

2000

2500

3000

2000 2001 2002 2003 2004 2005

$ M

illi

on

s

Aggressive

Conservative

Source: IDC, Gartner Group, Yankee Group, Cisco Analysis


Market DynamicsMarket DynamicsMarket DynamicsMarket Dynamics Infrastructure & Technology Infrastructure & Technology

OptionsOptions Infrastructure & Technology Infrastructure & Technology

OptionsOptionsStandardsStandardsStandardsStandards






BusinessRing

MetropolitanRing

Backbone Ring

STM-16STM-16

STM-4STM-4STM-1STM-1

TransitSwitch

LocalSwitch

LocalSwitch

Traditional Metro Infrastructure

Digital Cross ConnectDigital Cross Connect

Pre-Internet


Traditional Metro Infrastructure

Internet Era

STM-16STM-16


Backbone Ring

BusinessRing

MetropolitanRing



• Rigid Bandwidth Hierarchy

• No Statistical Multiplexing

• No Burst Support

• No L2 and L3 Integration

• No Multicast Support

• No QoS

Traditional Metro Infrastructure Issues


BusinessRing

MetropolitanRing

Backbone RingNextGen SDH

Backbone Network

Next Generation SDH Infrastructure Option


STM-16STM-16


STM-1/4/16/64 Business Ring

STM-1/4/16/64Metropolitan

Ring


Data

Regional Metro EthRegional Metro Eth

Met

ro E

th

Acc

ess

Met

ro E

th

Acc

ess

Metro Eth

Access

Metro Eth

Access

New Metro Ethernet Networks

Metro Ethernet Infrastructure Option

AccessRing

AccessRing

3/1 Digital Cross Connect


Regional Ring

OC-48OC-48

OC-12OC-12OC-12OC-12

OC-3OC-3OC-

3OC-

3

OC-12OC-12OC-3OC-3

OC-48OC-48OC-48OC-48 OC-48OC-48

AccessRing

AccessRing



Regional Ring

OC-48OC-48

OC-12OC-12OC-12OC-12

OC-3OC-3OC-

3OC-

3

OC-12OC-12OC-3OC-3

OC-48OC-48OC-48OC-48 OC-48OC-48

Voice/TDM

Existing Networksfor Voice Growth

VoIP Gateway Video/IP Server


Two Technology Options

• Option 1: Ethernet Transport/Backhaul

• Option 2: RPR Transport/Backhaul

• Both provide Ethernet customer facing interfaces (UNI)


ONTONT

CO OSP CPE

100 Mbps< 100 m

GatewayGatewayGatewayGateway

1 Gbps < 10 km

100 Mbps< 2 km

ONTONT

ONTONT

TVTVTVTV PCPC

PCPC

PC

1000BASE-LX100BASE-FX

10

00

BA

SE

-X1000BASE-LX100BASE-FX

Data

Data

Video

Video

VoIPVoIP

VidVid

Residential

Business

ONT= Optical network terminator

OSP= Outside plant

Cat 5

SM or MM fiber

SM or MM fiber

Metro Access with EFM/ETTX Alternative Ethernet Transport/BackhaulEthernet Transport/Backhaul


Subtended Ring

POP/HUB

SiSi

SiSi SiSi SiSi SiSi

Access Aggregation

Layer

Customer AccessLayer

SiSi

SiSi

GE Hub&Spoke GE Rings

Metro Access with EFM/ETTX Alternative Ethernet Transport/BackhaulEthernet Transport/Backhaul


The RPR (Resilient Packet Ring) Alternative Powered by Dynamic Packet TransportPowered by Dynamic Packet Transport

• Dynamic Packet Transport (DPT), the market-

leading Resilient Packet Ring (RPR) IEEE

802.17 solution

• Based on the Cisco-developed Spatial Reuse Protocol (SRP) – RFC 2892

Regional Metro IPRegional Metro IPRegional Metro IPRegional Metro IP

Metro IP

Acc

ess

Metro IP

Acc

ess

Metro IP

Acc

ess

Metro IP

Acc

ess Metro IP Access

Metro IP Access

Metro IP Access

Metro IP Access


The RPR (Resilient Packet Ring) Alternative Reliable IP/MPLS-aware Optical TransportReliable IP/MPLS-aware Optical Transport

• Flexible architectures: Optical rings and stars, SRP/node re-ordering

• Carrier-class reliability: <50ms recovery; IPS/L2 Path Restoration

• Multi-layer Awareness: L1(optical monitoring); L2 (SRP stats); L3 (IP Statistics)

• Plug-and-Play operation: DPT features (topology discovery/ adds); Ethernet subscriber interfaces

• STM4, STM16 speeds, doubled, 1Gbps, 5Gbps

Regional Metro IPRegional Metro IPRegional Metro IPRegional Metro IP

Metro IP

Acc

ess

Metro IP

Acc

ess

Metro IP

Acc

ess

Metro IP

Acc

ess Metro IP Access

Metro IP Access

Metro IP Access

Metro IP Access


MACMAC

MACMAC

L3L3

MACMAC

MACMAC

L3L3

MACMAC

MACMAC

L3L3

MACMAC

MACMAC

L3L3

O-Tx

I-Rx

O-Rx

I-Tx

O-Rx

I-Tx

O-Tx

I-Rx

O-T

x

I-R

x

O-R

x

I-T

x

I-T

x

O-R

x

I-R

x

O-T

xSRP-LC SRP-LC

SRP-LCSRP-LC

Ring B

Ring A

The RPR Ring Packet Flow

Ring A

Ring A

Ring A

Ring B

Ring B

Ring B


L3 SwitchingL3 Switching

Rx Queue Tx Queue

Lo

Pri

ori

tyL

o P

rio

rity

Hi

Pri

ori

tyH

i P

rio

rity

Hi P

riority

Hi P

riority

Lo

Prio

rityL

o P

riority

O-RxO-Rx

I-TxI-Tx

O-TxO-Tx

I-RxI-Rx

Transit Buffer

Transit BufferSRP MAC SRP MAC

Hi PriorityHi Priority

Lo PriorityLo Priority

The RPR Node Packet Flow

Hi PriorityHi Priority

Lo PriorityLo Priority

Ring A

Ring B


• Packet flowSourced onto ring with multicast bit set

Received by appropriate routers on ring

Stripped from ring by source

The RPR Multicasting SupportThe RPR Multicasting Support

Source

GSRGSR

Cisco 75XXCisco 75XX


GSRGSR





Metro IP/Ethernet Architecture Optimize the Metro Optical InfrastructureOptimize the Metro Optical Infrastructure

IPIP

ATMATM

OpticalOptical

B-ISDNB-ISDN IP over ATM

IP over ATM

IP over SONET/SDH

IP over SONET/SDH

IPIP

IP-aware Optical

IP-aware Optical

IP over OpticalIP over Optical

IPIP

SONET/SDHSONET/SDH

OpticalOptical

ATMATM

SONET/SDHSONET/SDH

IPIP

OpticalOptical

Multiplexing, Protection, and Management at Every Layer

Lower Cost, Complexity, and OverheadLower Cost, Complexity, and Overhead


Market DynamicsMarket DynamicsMarket DynamicsMarket Dynamics









Resilient Packet Ring (RPR) Standards January 2002 IEEE 802.17 Proceedings—The Darwin ProposalJanuary 2002 IEEE 802.17 Proceedings—The Darwin Proposal

• A new proposal-Darwin, was presented and is based on Cisco developed SRP technology (IETF informational RFC 2892). It retains the features and benefits of SRP with the addition of enhancements for broader industry application. It continues work that was published as the Gandalf proposal.

• Darwin was proposed as the basis for the first working group draft.

• The Darwin proposal has support from over 20 companies

http://www.ieee802.org/17/documents.htm


Resilient Packet Ring (RPR) Standards IEEE 802.17 Working Group TimelineIEEE 802.17 Working Group Timeline

• As found in http://www.rpralliance.org/articles/Timeline.pdf

Nov 2001 – Proposal Draft

Jan 2002 – First draft

Mar 2002 – Last Addition to draft

Jul 2002 – Working Group Ballot

Sep 2002 – Last technical change

Nov 2002 – IEEE 802 Sponsor ballot

Mar 2003 - Standard

http://www.rpralliance.org/articles/Timeline.pdf

http://www.rpralliance.org/articles/Timeline.pdf


IEEE 802.3ah EFM Standards Layer DiagramLayer Diagram

Ethernet Media Independent Interface (MII)optional

Media Access Control (MAC)Full Duplex

Media Access Control (MAC)Full Duplex

EoVDSL PHYEoVDSL PHY

Copper Copper PMDPMD

Copper Copper PMDPMD

OpticalOpticalPMDPMD

OpticalOpticalPMDPMD

EPON PHYEPON PHY

Optical Optical PMDPMD

Optical Optical PMDPMD

1000BASE-X PHY 1000BASE-X PHY

http://grouper.ieee.org/groups/802/3/efm/public/index.html

http://grouper.ieee.org/groups/802/3/efm/public/index.html


• EFM SG (Ethernet in the First Mile Speed Study Group)• PAR (Project Authorization Request)• 802.3ah—the name of the projectand the name of the sub-committee of IEEE 802.3 chartered with writing the Ethernet in the first mile standard

IEEE 802.3ah EFM Standards Prospective Schedule for IEEE 802.3ah Task ForceProspective Schedule for IEEE 802.3ah Task Force

WorkingGroupBallot

LMSCBallot

Standard

2000 2002 20032001

802.3ahFormed802.3ahFormed

PARDrafted

PARDrafted

PARApproved

PARApproved

EFM SGFormedEFM SGFormed




Metro Ethernet Metro Ethernet ServicesServices








Control Plane And Data Plane

• Network functions separated into 2 planes

• Control PlaneRouting protocols, creates FIBs

Builds adjancey tables

What the Processor does

• Data PlaneForwards packets

High Speed ASICSs

FIB tables installed


Metro Ethernet Planes

InternetAccessInternetAccess

Diff (CoS)Services

Diff (CoS)Services

TLS(L2 VPN)

TLS(L2 VPN)

IP VPN(L3 VPN)IP VPN

(L3 VPN)Packet

TelephonyPacket

Telephony

IEEE 802.1Q IEEE 802.1Q

Spanning Tree ProtocolSpanning Tree Protocol


Flat Metro Ethernet Switching System

MetroNetwork

EnterpriseCampus

B 10/100MbitEthernet

GbE GbE

EnterpriseCampus

C

4000* 4000*

3550

3550 3550

3550UNI UNI

802.1QinQ/STP Control Plane802.1QinQ/STP Control PlaneTransparent LAN SvcTransparent LAN Svc


Metro Ethernet Planes => Scalability


Diff (CoS)Services

Diff (CoS)Services

TLS(L2 VPN)

TLS(L2 VPN)


(L3 VPN)Packet

TelephonyPacket

Telephony

Spanning Tree Protocol & IP/MPLSSpanning Tree Protocol & IP/MPLS

IEEE 802.1q / UTI/EoMPLS / MPLS VPNIEEE 802.1q / UTI/EoMPLS / MPLS VPN


Scalable Metro Ethernet Switching System

802.1q Tag802.1q Tag 802.1q Tag802.1q Tag

EoMPLS Control PlaneEoMPLS Control PlaneEthernet VC SvcEthernet VC Svc

MPLS Control PlaneMPLS Control PlaneIP VPN ServiceIP VPN Service

EnterpriseCampus

MPLS-enabledNetwork

Metro Network

Metro Network

EnterpriseCampus

7600 7600

3550/4000

3550/4000

3550/4000

3550/4000

UNI

UNI

GE

GE

GE

GE

GE

802.1qinq Tag802.1qinq Tag 802.1qinq Tag802.1qinq Tag

EoMPLS Control Plane EoMPLS Control Plane Directed VLAN SvcDirected VLAN Svc

12000


Metro IP/Ethernet (RPR) Planes


Diff (CoS)Services

Diff (CoS)Services

TLS(L2 VPN)

TLS(L2 VPN)


(L3 VPN)Packet

TelephonyPacket

Telephony

IP / UTI/L2TPv3 / EoMPLS / MPLS VPNIP / UTI/L2TPv3 / EoMPLS / MPLS VPN

IEEE 802.17 RPRIEEE 802.17 RPR


Metro IP (RPR) System Ethernet Access

10720/7600

DPT/RPR

12000

UNI

IP Control PlaneIP Control PlaneIP ServiceIP Service

MPLS Control PlaneMPLS Control PlaneIP VPN SvcIP VPN Svc

EoMPLS or L2TPv3 CPEoMPLS or L2TPv3 CPEthernet VC SvcEthernet VC Svc


Hybrid Metro IP/Metro Ethernet Switching

10720/760012000Enterprise

Campus

3550/4000

3550/4000

UNI

DPT/RPR

802.1q Tag802.1q Tag

IP Control PlaneIP Control PlaneIP ServiceIP Service

MPLS Control PlaneMPLS Control PlaneIP VPN SvcIP VPN Svc

EoMPLS or L2TPv3 CPEoMPLS or L2TPv3 CPEthernet VC SvcEthernet VC Svc

GE


Discussion (1)

• TLS is required when customers have a need to interconnect individual L2 networks to form a single flat L2 network where connectivity is controlled by the Spanning Tree Protocol

• TLS assumes L2 capabilities in SP network which can lead to scalability problems there

participation of SP switches in STP (performance, stability)

increase of number of hops (customer has to add number of hops in SP network to those in his own network to check whether requirements of max. 7 for STP are still met)

knowledge of customers‘ MAC addresses by SP switches (number potentially huge!)

• SPs should thoroughly understand their customers‘ real needs, i.e., find out whether they really need TLS, or whether EVCS would be better suited (sometimes TLS is falsely used as a synonym for all the Ethernet-based approaches presented)


Ethernet Transparent LAN Service – 802.1QinQ

802.1Q Trunks to Customer Defined VLANS

SiSi

SiSi

SiSi SiSi

L2 EthernetEnterpriseSite C

EnterpriseSite D

EnterpriseSite A

EnterpriseSite B

To the Enterprise this network look like a shared flat earth 802.1Q Ethernet Domain

A B C D

Access (L2)802.1QinQ




Core (L2)802.1Q

Core (L2)802.1Q

802.1Q

802.1QinQ

802.1QinQ

802.1QinQ

802.1QinQ


Discussion (2)

• Enterprise networks are typically built using routers between (small) L2 segments (e.g. spanning a floor of a building)

• Interconnection of enterprise sites virtually always uses gateway routers into the SP network=> EVCS is most appropriate L2 service to interconnect enterprise sites

• EVCS can be provided using EoMPLS or L2TPv3 mechanisms across a L3 network, thus avoiding scalability problems inherent to L2 networks in SP environment

• Ethernet Service is not necessarily LAN Emulation


Ethernet Virtual Circuit – EoMPLS

EnterpriseCampus

A Ethernet Mapped Circuit

Access (L2)Ethernet

Access (L2)Ethernet

Access (L2)Ethernet

Access (L2)Ethernet

CoreMPLSCoreMPLS

Ethernet CircuitEoMPLS Tunnel in Core Enterprise

CampusB

MPLS

10/100/GigabitEthernet


To the Enterprise this network is a pair of Pt to Pt 10/100/Gbit/s Bridged Ethernet Links

A B

MPLS PE MPLS PE


Ethernet Virtual Circuit – L2TPv3 (UTI)

EnterpriseCampus

A Ethernet Mapped Circuit

Access (L2)Ethernet

Access (L2)Ethernet

Access (L2)Ethernet

Access (L2)Ethernet

CoreIP

CoreIP

Ethernet CircuitIP Tunnel in Core Enterprise

CampusB

IP



To the Enterprise this network is a pair of Pt to Pt 10/100/Gbit/s Bridged Ethernet Links

A B


Layer-2 Transport across MPLS

• Two relevant drafts by Luca Martinidraft-martini-l2circuit-trans-mpls

describes label distribution mechanisms for VC labels

draft-martini-l2circuit-encap-mpls

describes emulated VC encapsulation mechanisms

• Relevant for the transport of FR, ATM AAL5, ATM cell, Ethernet (Port Trunking), Ethernet 802.1q (VLAN), POS, TDM, Cisco HDLC & PPP protocol data units

across either an MPLS or an IP backbone


CC VC info lengthVC info length

Group IDGroup ID

VC IDVC ID

Interface ParametersInterface Parameters

Virtual Circuit FEC Element

C: Control Word (1 bit) – Control word present if bit set

VC-type (15 bits) - Type of VC e.g FR, ATM, VLAN, Ethernet, PPP, HDLC

VC info length (8 bits) – Length of VCID field and interface parameters

Group ID (32 bits) – Represents a groups of VCs. Can be used for mass label withdrawal

VC ID (32 bits) – Connection identifier used in conjunction with the VC-type to identify a particular VC

Interface Parameters (Variable) – Edge facing interface parameters, such as MTU

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

VC-typeVC-typeVC TLV (0x80)VC TLV (0x80)


LengthLength Sequence numberSequence numberRsvdRsvd FlagsFlags

EXPEXP TTL (set to 2)TTL (set to 2)11VC Label (VC)VC Label (VC)

EXPEXP TTLTTL00Tunnel Label (LDP or RSVP)Tunnel Label (LDP or RSVP)

Layer-2 PDULayer-2 PDU

• When transporting layer-2 protocols over an IP or MPLS backbone:

The sequence of the packets may need to be preserved;

Small packets may need to be padded if the minimum MTU of the medium is larger than actual packet size;

Control bits carried in header of Layer-2 frame may need to be transported

Layer-2 Transport Control Word

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

00 00

VC LabelVC Label

Tunnel LabelTunnel Label

Control WordControl Word


Transport of Ethernet over MPLS

• Three main requirements for transport of Ethernet frames

802.1q VLAN to 802.1q VLAN transport;

802.1q VLAN port to port transport;

Ethernet port to port transport

• 802.1q VLAN to VLAN transport VC-type 0x0004 within draft-martini-l2circuit-trans-mpls;

VC-type 0x0005 port-to-port Ethernet trunking & port-to-port


Ethernet 802.1q VLAN Transport

MPLS

VLAN 41

VLAN 41

VLAN 56

VLAN 56

PE1 1.0.0.4

PE1 1.0.0.8

802.1q to 802.1q VLAN Transport

Customer Site

Customer Site

Customer Site

Customer Site


EoMPLS Encapsulation Details

• Ethernet PDUs are transported without the preamble, SFD and FCS

but including all VLAN information such as VCID

• The control word is optional

C bit is set by default in Cisco implementation

• If the control word is used then the flags must be set to zero

The VLAN tag is transmitted unchanged but may be overwritten by the egress PE router

LengthLength Sequence numberSequence numberRsvdRsvd 0 0 0 00 0 0 0

Ethernet PDUEthernet PDU

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

00 00 OptionalOptional


IP VPN, L2TP, UTI

• Cisco Product: “UTI/L2TPv3”

• UTI is a high performance transparent tunnelling protocol. It is aimed at 150Mb/s to 10Gb/s level two tunnelling applications

Encapsulation: L2TPv3

IETF standardization: L2TPv3: data & control planes http://www.ietf.org/html.charters/l2tpext-charter.html

Cisco Pre-Standard’s technology: UTI

11/01: UTI matches L2TPv3 latest draft

UTI: Universal Transport Interface

high-performance transparent encapsulation protocol optimized for the encapsulation of one protocol over another.


UTI/L2TPv3 Encapsulation

• One of the formats that L2TPv3 will support is the existing UTI encapsulation draft-ietf-l2tpext-l2tp-base-01.txt

IP header

UTIPayload Independent

Header

UTIPayload Dependent

Header

Payload

UTI Header

0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| TUNNEL IDENTIFIER | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| TUNNEL Key |+ +| (64 bit signature) | -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


Basic UTI/L2TPv3 tunnels

• Crossconnect any interface with any other interface through an IP network

IP Network

UTI tunnelled LAN

UTI tunnelled serial interface

R1R2

LAN1LAN2

tu1

tu2

e1 e2

pos2 pos3R3 R4

pos1 pos4


Why UTI/L2TP rather than GRE?

• UTI/L2TPv3 is more scalable to high performance (10G)

To identify a GRE tunnel you have to do a source + destination IP address pair lookup. This is very perf consuming and not needed for L2Transport

GRE header has many options which are complex to program in HW

Scales to 10gbps

• Leverage L2TP control plane and deployment experience

IETF since 96, IOS implementation since 98

Similar Objective (Eth, FR, PPP over IP)

Experience to be leveraged


New Generation of Services...

3 VoIP TerminalsVoIP

128/128 Kbps

384/384 Kbps

2 Digital TVMPEG

3072/64 Kbps

6144/128 Kbps

2 Personal ComputersWEB

512/128 Kbps

1024/256 Kbps

4 MonitoringSystems

32/128 Kbps

128/512 Kbps

Broadband AccessBroadband Access

76807680//12801280 Kbps Kbps

Telephony

Digital TVOnline

Services Surveillance

DownstreamUpstream

Totally DigitalTotally Digital Totally IntegratedTotally Integrated One Single ProviderOne Single Provider


…But the Today’s Services are

• Ethernet Virtual Circuit

• Flexible Speed IP VPN

• Voice over IP

• Content Services

• High Speed Internet


Layer 2 (EoMPLS or UTI/L2TPv3) EVCS Service

Office Tower

Customer B

Customer A

Customer B’s Corporate HQ

Customer A’s Corporate HQ

Cisco10720

UTI tunnel

EoMPLS tunnel

IP/MPLSCore

Cisco10720

Cisco10720

Floor 2

Floor 1

• Customers are located on different floors and connected to the HQ via UTI or EoMPLS• UTI or EoMPLS tunnel is configured on each interface the customer is homing on

VPN Solution Center


MPLS-based IP VPN Service

CE

CE

PoP

Office Tower 2

Office Tower 1

Customer B

Customer A

Customer B’s Corporate Intranet

P

Customer A’s Corporate Intranet

Cisco 10720

Cisco 10720

PE

PE

PE

CE

CE

P

IP VPN over MPLS Backbone

VPN Solution Center

IP/MPLS Core

Cisco 10720


Variable Bandwidth Service

• Variable bandwidth Service in increments

of 1 Mbps up to 100Mbps

• Using ‘CAR’ on both Input and output

(Ethernet interface) to limit bandwidth to

each Customer

Router

Customer A

Router

10720 Router

Switch

Regional IP Transport ringBackbone

15Mbps

Metro IP Access Ring

Customers

Customers Customers

10Mbps

Customers

Customer B

Customer C

Customer D

5Mbps

1Mbps

Hub

fa2/1

fa2/2fa2/3

fa2/4


Metro Landscape Diversity

CustomersCustomers

SystemsSystems

Ent/SMBEnt/SMB Retail SPRetail SP ConsumerConsumer

L2 Enet VPNL2 Enet VPN

InternetInternetAccessAccess

IP VPNsIP VPNs

TDM PLTDM PL WavelengthsWavelengths

StorageStorageGbE PLGbE PL

FR/ATM VPNFR/ATM VPN

TechnologiesTechnologiesSONET/

SDHWDMEthernetEFMIP DPT/RPR

SP SegmentsSP Segments

ServicesServices

ILEC/PTTILEC/PTT IXC/T1ISPIXC/T1ISP ESPESP

Metro OpticalMetro OpticalTransport SystemTransport System

Metro OpticalMetro OpticalTransport SystemTransport System

Metro EthernetSwitching System

Metro EthernetSwitching System

Metro IPSystemMetro IPSystem

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