Change the Game with Next Generation Ethernet Transport: BlackDiamond Press & Analyst Presentation Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved.

Easy-to-Operate Next-Generation Networks Proactive Service Management Graceful Service Expansion BlackDiamond ® Fifth-Generation Ethernet Transport Switch The BlackDiamond Series Changes the Game for Next- Generation Carrier Networks Increase Network Longevity Delight Your Subscribers Lower Cost of Ownership Page 1 Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved.

Long History of Ethernet Innovation Strong Partner for Carrier Ethernet Solutions patents issued/pending worldwide years as a NASDAQ-listed company of revenue from carriers on average ports shipped around the world countries with Extreme Networks ® presence of revenue invested in R&D on avg. Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved. Page 2 24x7 Global Technical Assistance Center and Global Carrier Professional Services Support Team 24x7 Global Technical Assistance Center and Global Carrier Professional Services Support Team

Extreme Increasing CESR Market Share CESR = Carrier Ethernet Switch Router Source: Heavy Reading Research, CESR Quarterly Tracker, July 2009 Page 3 Extreme CESR Market Share Rolling 4 Quarter Market Share % Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved. Growing Worldwide Carrier Ethernet Switch Router Market Share as Global Economy Stalls

Ethernet Access Central Offices 24 or 48 x10/100 E, 2x GE Up 24 or 48xGE Access, 4x 10 GE Up MEF Certified Carrier Ethernet Portfolio USDA RUS Accepted Ethernet Access and Aggregation Central Offices Metro Core Central Office Summit X250e Summit X450a Summit ® X650 24x10 GE High Density Ethernet Access GE to 10 GE Aggregation BlackDiamond GE Density 100 GE Ready 10 GE Density 100 GE Ready BlackDiamond ® Page 4 Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved.

Extreme Powers Ethernet Networks Across Rural America, Major Metros, Nations Page 5 Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved. Residential Video and Business Ethernet Services Powered by Extreme Networks Ethernet Transport

Trends In Carrier Networks Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved.

IPTV Worldwide Revenue Opportunity Rapid Growth Forecast Worldwide Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved. Page 7 Video Services Drives Carrier Revenue Growth and Next Generation Network Deployments As Global Economy Stalls

Ethernet Access and Aggregation Network SubscriberIP Services Shift From TDM E1/T1 Shift From Separate Voice and Data Networks Shift From Voice and DSL Internet Access Trends in Subscriber Services Growth Driven by Application Convergence Residential and Business Subscribers are Demanding High- Speed, High-Performance Services To Triple Play over Active Ethernet or PON To VOIP, High Speed Internet and VPN over Ethernet Access To Ethernet Mobile Backhaul for Voice, Video and Internet Access Page 8 Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved. Residential Business Mobile Backhaul

More Services on Shared Network Increases Subscriber Sensitivity and Importance of Service Management Video Mobile Data Business Ethernet Voice Internet Trends in Carrier Aggregation Networks Overall Shift from Circuit to Packet Metro Core Shift From SONET/SDH Circuit Transport To 10G and Eventually 100G Ethernet Transport Rings Shift From Automatic Protection Switching (APS) To Ethernet APS (EAPS) and Eventually G.8032 Resilient Ethernet Rings Shift From Re-Active Circuit Management To Proactive Service Management Page 9 Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved. Ethernet Access and Aggregation NetworkSubscriberIP Services

10G Ethernet Rings Today 100G Ethernet Rings Future Ethernet Access and Aggregation NetworkSubscriber Residential E-FTTH Video Internet Voice Graceful Service Expansion Why 480 Gbps / Slot Matters in Video Deployments Page 10 Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved. IP Services Access Aggregation C.O Metro Core Revenue Opportunity Drives Network Investment High-bandwidth services require high-performance networks Revenue growth and service quality depend on bandwidth availability Metro Core Return On Investment Scales With Network Longevity BlackDiamond ® Ethernet Access C.O. Equipment and training investment reused as network grows to 100 GE

Metro Core Service Differentiation Enabled with Multicast Quality of Service Different services address different subscriber markets, allowing carriers to increase overall service penetration rates Premium Subscriber Video Internet Voice Proactive Service Management Why Multicast QoS Matters in Video Deployments Page 11 Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved. Access Aggregation C.O Metro Core Live Sports Drives Multicast Video Traffic BlackDiamond ® Multicast QoS assures packet delivery for premium content Best Effort Video $ Premium Video $$$ Live Sports Video $$ Value Subscriber Ethernet Access and Aggregation NetworkSubscriberIP Services

Residential E-FTTH Video Internet Voice Proactive Service Managmenet Why Ethernet OAMP Matters in Video Deployments Page 12 Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved. Access Aggregation C.O Metro Core Service Management System Simplifies Operations BlackDiamond ® Ethernet Access C.O. IEEE 802.1AG Continuity Fault Management ITU Y.1731 Jitter & Latency Measurement EPICenter ® Management System Easy-to-use tools for provisioning and monitoring Ethernet Transport networks Metro Core Advanced Ethernet OAM Improves Manageability Standards based support eases manageability of multi-vendor, multi- provider networks Ethernet Access and Aggregation NetworkSubscriberIP Services

Graceful Service Expansion Why Common Components Matter in Video Deployments Ethernet AccessSubscriber Residential E-FTTH IP ServicesEthernet Aggregation 10G or Future 100G Ethernet Rings BlackDiamond Page 13 Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved. 10G Ethernet Rings Ethernet Access C.O. BlackDiamond Metro Core BlackDiamond Series Common Software and Hardware Fewer spare parts required Lower training investment Increased return on investment Video Voice Internet Metro Core C.O. Access Aggregation C.O.

Metro Core Resilient Ring Topology Most Cost Effective Use of Fiber Assets Metro Core EAPS Supports Next- Generation Ring Requirements Today Proactive Service Management Why EAPS Matters in Video Deployments Ethernet AccessSubscriberMetro CoreEthernet Aggregation Metro Core C.O. Page 14 Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved. 10G Ethernet Rings Ethernet Access C.O. Video Voice Internet Fiber already deployed in ring topologies for SONET/SDH networks EAPS maintains service continuity for key services through ring fault Sub-tended rings with dual-node interconnect across access and aggregation Spatial reuse with multiple domains improves efficiency and prioritizes services Residential E-FTTH Access Aggregation C.O. 10G or Future 100G Ethernet Rings

Ethernet Transport Delivers Lower Total Cost of Ownership Compared With MPLS Page 15 Total Cost of Ownership (US$M) Five-Year Total Cumulative CapEx and OpEx Source: Network Strategy Partners, 2008 Extreme CapEx Advantages High line-rate 10GE port density results in fewer switches Disruptive pricing for 10 GE Extreme OpEx Advantages Lower CapEx drives lower annual service contract costs Lower power, less rack space, less HVAC Operational simplicity of Ethernet OAMP Easy-to-Operate Networks Why It Matters In Next Generation Deployments Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved.

BlackDiamond Highlights Page 16 8 Port 10 GE IO Modules 40 Port 1 GE IO Modules Management Modules(1:1) Max. 3 Power Supplies (N+1) Max. 5 Fabric Modules (N+1) Extreme XOS ® Software Hot-swappable Management Modules and IO Modules Multicast QoS Continuity Fault Management Hardware Support Redundant (N+1) Hot-Swappable Power Supplies NEBS Level 3 Compliant PB, PBB EAPS, CFM, Y.1731, HQoS MPLS Layer 2, VPLS, H-VPLS, RSVP-TE OSPF, IS-IS, BGP, RIP, PIM Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved. Hardware Available 1Q 2010

BlackDiamond Series Competitive Comparison Requirement Extreme Networks BlackDiamond ® / Cisco Systems 7606/7609 Cisco Systems ASR9006/9010 Brocade MLX 8 / MLX 16 Maximum number of line rate 10 GE ports per slot 8 < 444* Maximum number of line rate 10 GE ports per switch 32 / 64 <16(28)16/3232/64 Available Bandwidth per slot 120 Gbps 40 Gbps Approx. 50 Gbps Line Rate 100 GE Ready Yes NoFuture Upgrade Future bandwidth per slot 480 Gbps Not Announced400 GbpsNot Announced Hardware Compatibility Yes No Yes Software Commonality Yes No PBB Yes No 50ms Ring Protection Yes, EAPS No No, MRP Service Management GUI Yes No *Two Brocade half slots are equivalent to one BlackDiamond series slot Page 17 Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved. BlackDiamond Series Delivers Graceful Expansion of Services with 100 GE Ready Systems

Easy-to-Operate Next-Generation Networks Proactive Service Management Graceful Service Expansion BlackDiamond ® Next-Generation Ethernet Transport The BlackDiamond Series Changes the Game for Next- Generation Carrier Networks Page 18 Increase Network Longevity Delight Your Subscribers Lower Cost of Ownership Extreme Networks Confidential and Proprietary. © 2009 Extreme Networks Inc. All rights reserved.

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