1. Copyright 2007 Force10 Networks Extending Ethernet with Optical Networking Debbie Montano dmontano@force10networks.com Oct 9, 2007

2. Copyright 2007 Force10 Networks Special Note Regarding Forward Looking Statements This presentation contains forward-looking statements that involve substantial risks and uncertainties, including but not limited to, statements relating to goals, plans, objectives and future events. All statements, other than statements of historical facts, included in this presentation regarding our strategy, future operations, future financial position, future revenues, projected costs, prospects and plans and objectives of management are forward- looking statements. The words “anticipates,” “believes,” “estimates,” “expects,” “intends,” “may,” “plans,” “projects,” “will,” “would” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Examples of such statements include statements relating to [products and product features on our roadmap, the timing and commercial availability of such products and features, the performance of such products and product features, statements concerning expectations for our products and product features [and projections of revenue or other financial terms]. These statements are based on the current estimates and assumptions of management of Force10 as of the date hereof and are subject to risks, uncertainties, changes in circumstances, assumptions and other factors that may cause the actual results to be materially different from those reflected in our forward looking statements. We may not actually achieve the plans, intentions or expectations disclosed in our forward-looking statements and you should not place undue reliance on our forward- looking statements. In addition, our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures or investments we may make. We do not assume any obligation to update any forward-looking statements.

3. Copyright 2007 Force10 Networks We’ve come a Long Way Back in the old days... –E.g. in 1998/1999 when the Internet2 Abilene network was 1 st developed... –Optical Transport was provided only by Carriers or Service Providers –DWDM (Dense Wave Division Multiplexing) Systems which multiplexed multiple optical signals – wavelengths/lambdas – were point-to- point, and designed to carry SONET (Synchronous Optical Network) traffic, such as OC-48 (2.5 Gbps) or OC-192 (10 Gbps). –Voice network repurposed for data. –Topologies & links (circuits / lambdas) were hard wired and set in stone. –Carriers didn’t understand how anyone could need a WHOLE OC-192 (10 Gbps) circuit! –Expensive OC-192 (SONET) router interfaces were required.

4. Copyright 2007 Force10 Networks Changes – driven by R&E comm. Support for 10 GbE circuits (LAN PHY versus WAN PHY) –UltraScienceNet got OC-192 lambdas, then used Force10 ethernet switches to bridge WAN PHY to LAN PHY – the “on ramp” Used to be if you wanted to transport native 1 GbE, you could possibly shoe-horn 2 x GbE into an OC-48 (2.5 Gbps channel). Very wasteful. Internet2 GigaPOPs and backbones are running their own DWDM / Optical Transport backbones. Want synergies with their Ethernet infrastructure. HOPI project – Hybrid Optical & Packet Infrastructure –Dynamic capacity, integrated capacity. GLIF – Global Lambda Integrated Facility

5. Copyright 2007 Force10 Networks Reliability – growing up Core research, Critical applications, Voice/Video- over-IP, all relying on your networks –Ethernet switch/routers have become more resilient –Built in redundancy, distributed hardware, modular software Optical Transport –No longer expects a SONET layer to provide redundancy & failover. –Supports automatic rerouting & restoration, high availability

6. Copyright 2007 Force10 Networks E-Series Resiliency Architecture Resilient Hardware Architecture Link Resiliency Protocol Resiliency Manageability and Serviceability HA Software Architecture Modular OS (NetBSD) 3 CPU (L2, L3, CP) Line Card CPU HA Software Hardware Redundancy Distributed Forwarding Hitless Failover DoS Protection LAG ECMP LFS/WAN PHY BFD OSPF/BGP Restart RSTP, MST VRRP Hitless Software Upgrade Hot Swap Logging and Tracing One Software Image

7. Copyright 2007 Force10 Networks Capacity – Room for Growth R&E driving massive use of bandwidth Future-proof networks Optical Transport provides enormous room for growth – to add wavelengths/lambdas, support additional circuits, aggregate all types of traffic Ethernet switch/routers support 90-port GbE cards, 16 port 10GbE cards, with higher densities coming.

8. Copyright 2007 Force10 Networks OTN Optical Transport Network (OTN) is composed of a set of Optical Network Elements connected by optical fiber links, able to provide functionality of transport, multiplexing, switching, management, supervision and survivability of optical channels carrying client signals. Defined in ITU (International Telecommunications Union) standard G.709 & related standards. OTN is currently offered in three rates, OTU1,OTU2 and OTU3. (OTU = Optical Transport Unit). –OTU1 – approx 2.7 Gbps, designed to carry OC48. –OTU2 – approx 10.7 Gbps, designed to carry OC-192, or 10 GbE WAN PHY. Can carry 10 GbE LAN PHY – overclocked/shoe-horned in. –OTU3 – approx 43 Gbps, design for “40 Gbps” transport. A little 10 GbE vs OTN mismatch, but we’ve made it work –E.g. Force10 E-Series 10 GbE ports are software selectable for WAN PHY versus LAN PHY operation. OTN products providing additional Ethernet options & Capabilities

9. Copyright 2007 Force10 Networks Ethernet & OTN: Match made in Heaven? Not initially... But Ethernet and Optical Transport need each other, so they learned to get along and compliment one another

10. Copyright 2007 Force10 Networks Ethernet Reach without Optical Transport Will reach to local users, servers, storage, compute nodes. Won’t even reach from San Diego to Pasadena. 10 GbE –15 m, CX4 cable –300 m, MMF, SR optics –10 km, SMF, LR optics –40 km, SMF, ER optics –80 km, SMF, ZR optics 1 Gb E –100 m, Cat5 cable –220 m, multi-mode fiber (MMF), SX optics –10 km, single-mode fiber (SMF), LX optics –80 km, SMF, ZX optics

11. Copyright 2007 Force10 Networks Ethernet Reach WITH Optical Networking To the Moon and Back! OK... Not quite...but practically around the world.

12. Copyright 2007 Force10 Networks Thank You Debbie Montano dmontano@force10networks.com