Optical Ethernet Architecture Evolution The Logical Provider Edge. Mark I Williams August 28 th, 2003

Transcription

1 Optical Ethernet Architecture Evolution The Logical rovider Edge Mark I Williams August 28 th,

2 Agenda OE Introduction and Drivers VLS The technology behind the Service Decoupled VLS roviding Scalable and Affordable VLS Services Summary 2

3 What is Optical Ethernet? Ethernet Ubiquity Flexibility Simplicity Combined With Metro Area Network Optics Reach Scale Reliability Fast Simple Reliable Extend the boundaries of the LAN to encompass the MAN & WAN 3

4 Global Optical Ethernet Service Revenue Global Optical Ethernet Services Revenue US$Millions Global OE Service Revenue Source: IDC

5 Success is in the lug Service rovider Ethernet Connection Interfaces readily used today Network switches & routers Computers & eripherals i-appliances Network-Based Services Services customers will buy Connectivity Applications Content & Entertainment Telephony Outsourced services Simplicity at the edge 5

6 OE Enterprise Value ropositions Reduce IT cost and risk by simplifying the Network Reduced dependence on I routing & complexity Increase the available bandwidth over the network to LAN levels Enable high data volume applications such as multimedia streaming to be deployed across a wide area Extend the reach of the Campus network across wide area Improve the reliability of the network Carrier-grade OE enables critical applications like Disaster Recovery and Data Centre connectivity 6

7 OE Carrier Value ropositions Improve Enterprise customer business via OE services Deliver the Enterprise Value ropositions in previous chart Increase revenue by delivering new services Layer 2 VNs, Multi-media streaming Reduce the Capex and Opex of delivering carrier services OE infrastructure in conjunction with traditional I & MLS infrastructure 7

8 Carrier OE Service Transparent LAN Service Extending LANs into the Metro and beyond Upsell or replace leased line data services Speed of Ethernet with the Reliable and Integrity of leased line Transparent LAN Tunnel Edge Switch Ethernet Service rovider Edge Switch Bejing Targeted at Business Users! Shanghai 8

9 Carrier OE Service Managed LAN Service Multi-point LAN and network topology Combine both L2 and L3 VN service offerings Customer Site 1 Taipei Edge Switch Service rovider Optical Ethernet Edge Switch Customer Site 4 Hong Kong ISec Tunnel Travelling Worker IS dial-in Customer Site 2 Bejing Edge Switch Edge Switch rotec t Firewa ll Internet ISec Tunnel Home Worker Cable / DSL Enable Enterprise Outsourcing 9

10 VLS The Technology Behind the Service 10

11 OE Virtual rivate LAN Service (VLS) Types Ethernet oint-to-oint Wholesale connectivity (O-to-O, data centre interconnect, virtual colo) Alternative for leased lines Customer bridge/router OE Network Ethernet oint-to-multi-oint Retail / Wholesale OE services Switching based on 802.1Q VLAN tag Alternative for FR, ATM, Ethernet Any to Any Retail OE services to enterprise Ethernet LAN extension over the metro/wan Alternative for I VN OE Network OE Network 11

12 Network Reference Model for VN VN A VN B E Backbone Tunneling - MLS/GMLS/ISec/GR E Backbone E VN A VN B E VN C VN C VN D - Customer Edge Device E - rovider Edge Device VN D Switch - rovider Internal Device "rovider rovisioned VNs": VNs for which the Service rovider (S) participates in management and provisioning of the VN. 12

13 Decoupled VLS roviding Scalable and Affordable VLS Services 13

14 VLS Architectures Edge-to-edge MLS MLS is deployed all the way between Service rovider Edges Decoupled Models E-Edge in the buildings Transport Network (EoX, Others)- (MLS Enabled) E-Core MLS Backbone 802.1Q at Edge & Aggregation Network with MLS core: i.e. decoupled model with a dumb Edge 14

15 VLS Architecture artial Bridge MLS edge-edge E MLS Backbone seudowires (Martini) VLS Forwarder Emulated LAN Emulated LAN Interface IEEE Bridge Access Attachment Circuits Devices: Hosts, Routers, Bridges 15

16 HQ VLS Architecture Edge to Edge MLS Martini Encapsulation E1 MAC Learning, Replication E3 MLS RSV-TE Tunnels For MLS Fabric LD-DU (BG-M) for VLS Control lane E2 2 Ethernet Frame Control Tunnel VC Local TE Word (CW) Label Label Header Label Same Martini Encapsulation = Router = Ethernet Switch 16

17 Decoupled VLS Architecture Decoupled artial Bridge MLS Backbone seudowires (Martini) E VLS Forwarder N-E Access Network Emulated LAN Interface IEEE Bridge U-E Access Attachment Circuits Devices: Hosts, Routers, Bridges 17

18 Why Use A Decoupled Model? ECONOMICS MLS down to the S Edge Increases cost Expensive E in Buildings: (10,000s vs 100s)$ * 1000s of Es Complex rotocol Stack in the Building E MLS! Complexity! Cost Bandwidth Loss - Multicast Replication in buildings too close to the source! too many copies in the network Over 50% of the cost is In-Building Equipment Simplicity here is an absolute must! 18

19 Why Use a Decoupled Model? MLS SCALING VN Model requires a full-mesh of MLS tunnels between Es. MLS Edge-Edge requires 1 E per building Decoupled Model Requires 1 E per 100s of buildings. Example: China-Wide Network, 100,000 buildings. MLS edge-edge: 100,000*99,999 LSs = 10 billion LSs. Decoupled VLS: 1,000*999 LSs = 1 Million LSs I/MLS Backbone Decoupled E I/MLS Backbone Building CO You Could Not Build a China-Wide VLS Network without using a Decoupled VLS Model 19

20 VLS Decoupled Models Building Blocks E ESN Ethernet Switched Network N-E - rovider Edge Device U-E - E Edge Device MLS N-E ESN U-E VN A U-E MLS ESN U-E VN A VN B U-E ESN N-E N-E U-E VN B VN C Flexible Deployment Model: N-E to U-E - choice of Direct Link or different Ethernet Switched Networks Switch 20

21 4 Examples of Decoupled VLS Today DTLS Decoupled TLS draft-kompella-ppvpn-dtls-02.txt HVLS Heirarchical VLS draft-lasserre-vkompella-ppvpn-vpls-04.txt Logical E draft-ouldbrahim-l2vpn-lpe-02.txt GVLS Generic VLS solution draft-radoaca-ppvpn-gvpls-02.txt 21

22 DTLS - Distributed E (D-E) L2E VN A MLS MLS VN B E L2E E ESN L2E VN A L2E VN B VN C Divide the E into E and L2E E runs MLS-TE across the core MLS network E knows about VLS instances, but not about MAC addresses. Recommended that all provisioning be done on E, distributed to L2E by protocol. L2E is mostly a L2 device only. (L3 simple and used by control plane only. L2E acts as L2 bridge and sends encapsulated packets across pseudowire to E. Encapsulation can be MLS or stacked VLANs Core transport uses Martini Encapsulation or any other tunnel (GRE, ISec, etc) E uses BG for membership discovery across core. Broadcast/Multicast replication at source L2E 22

23 VN A MTU-s H-VLS - H-E ESN MTU-s VN A VN B MTU-s MLS E-rs MLS E-rs MTU-s VN B VN C Divide the E into E-rs and MTU-s E runs MLS-TE across the core MLS network E-rs learns MAC addresses and contains virtual bridging function. MTU-s aggregates VLS ports onto a single W per VLS to E-rs Encapsulation can be MLS or stacked VLANs Core transport uses Martini Encapsulation, GRE, Isec, etc. E uses LD for membership discovery across core. Broadcast/Multicast replication at source and dest E-rs and 23 dest MTU-s

24 Logical rovider Edge (L-E) E-Edge VN A ESN MLS MLS VN B E-Core E-Edge E-Core E-Edge VN A E-Edge VN B VN C Divide the E into E-Core and E-Edge E-Core runs MLS-TE across the core MLS network E-Core knows about VLS instances, but not about MAC addresses. Recommended that all provisioning be done on E-Edge, distributed to E-Core by protocol. E-Edge is a L2 device only. (L3 used by control plane only) E-Edge acts as L2 access multiplexer and sends encapsulated packets across Ethernet to E-Core Encapsulation can be Mac-in-Mac or MLS Core transport uses Martini Encapsulation or any other tunnel (GRE, ISec, etc) E-Core uses LD for membership discovery across core. Broadcast/Multicast replication as close to destination as possible. 24

25 MAC Learning: H-E DoS MAC Learning Edge Aggregation CORE Aggregation Edge VLAN Stacking and Denial of Service Attacks, MAC Explosion U-E N-E N-E?? U-E 3-10s sites 1000s-10,000 VNs 10,000s VNs 1000s-10,000 VNs 3-10s sites H-E forces MAC Learning in the N-E But still protects network core 25

26 MAC Learning: D-E and LE DoS MAC Learning Edge Aggregation CORE Aggregation Edge VLAN Stacking D-E and L-E MAC Learning Only in E-E U-E N-E 3-10s sites 1000s-10,000 VNs 10,000s VNs N-E 1000s-10,000 VNs U-E 3-10s sites Distributes MAC Learning to U-E - Contains the effects of DoS Attacks. 26

27 Technology Choices for Decoupled Models Bcast/Mcast Replication U-E N-E MLS N-E U-E Multicast flow destined to 3 UNIs located on the same destination E-E. Wasted Bandwidth in the MLS Backbone! (D-E) U-E N-E MLS N-E U-E Replicate as close to the destination as possible. Maximum Bandwidth Savings (H-E and LE) 27

28 GVLS Model 28

29 Objectives of GVLS Key goal is to support seamless integration of decoupled and all non-decoupled VLS models Same signaling mechanism Same auto-discovery mechanism Same provisioning model Allow integration of different access topologies across Service rovider network: Hierarchical E Distributed E With different technologies SET (MAC-in-MAC), 2, 2M, Q-in-Q etc. 29

30 TOWARD a UNIFIED VLS Solution GVLS - Common Information Model - Common Signaling Model - Common Date lan - Common Auto-discovery model -Rosen L2 signaling draft -Nortel/Cisco BG Autodiscovery -Martini Encapsulation draft DE -U-E-sf devices -SET Encapsulation -Martini -MAC-in-MAC -- MLS core HE -U-E-s devices -SET Encapsulation -Martini -Q-in-Q -VLAN -- MLS core DTLS and LE implement DE HVLS implements HE 30

31 A Closer Look at the Metro Transport Metro Transport Network MLS U-E N-E 31

32 Metro L2 Transport Mechanisms Stacked VLANs (Q-in-Q) VLAN stacking provides simple service delineation cost effectively Limited scalability Exposes Core Network to ALL Customer Addresses OE Header (MAC-In-MAC Encapsulate entire frame into Service rovider Ethernet packet Customer MAC addresses, VLAN and QoS transparently transported without affecting operator s network MLS Labels (seudowires) Leverage emerging connection-orientated standard for interoperability Incorporate values of fast, simple, reliable 802.1Q Tag OE Header MLS Labels ayload Customer Frame Customer Frame 32

33 Comparing Metro Access Methods Q-In-Q MAC-in-MAC MLS seudowires Demarcation oor Good Good Scalability oor Good Good Can have Direct connect across Access net? Yes Yes No Media Agnostic? No No Yes Simple edge switch? Yes No No Each Method Has its lace 33

34 Summary Optical Ethernet and VLS Services meet a significant Enterprise service requirement OE Service Revenue projected to grow at an annual rate of >120% from 2001 to 2006 (IDC) Asia acific will lead the investment with over 50% of revenues between now and 2007 (IDC) A Basic Technology behind these services is the L2 VN based on MLS core transport. The only way to affordably scale this infrastructure is by using a Decoupled VLS technology. IETF is in advanced stages of drafting specifications for decoupled VLS and multiple IETF-based implementations are in the market today. 34

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