Extreme Networks The Strong Base for Avaya Unified Communications Page 1 Avaya EMEA TechShare Conference, Budapest 2009

Dependent on Infrastructure Page 2 Network Requirements for Unified Communications High Availability and Resiliency Deterministic QoS Secure Simple and Efficient Operation Automated Network Administration Energy Efficient Centrally managed Simplifies Network Administration Solutions that Lower Deployment Risks Standards based interfaces Tested

Ethernet Solutions That Deliver the UC Promise Extreme Networks Simplicity Agility Availability Streamlined Implementation, Operation and Extension Secure and Resilient Networks for Reliable Communications Flexible Standards-Based Technology and Validated Solutions Page 3

Availability Page 4 Resilient Infrastructure and Solutions Highly Available Software ExtremeXOS: Modular, extensible software for the network Flexible Network Architecture Sub 50 ms Failure protection with EAPS Empowering choice: Fully-featured stacking or chassis Protects Prioritized Traffic Priority Queues for Voice and Video QoS Maintained Even Under Duress

ExtremeXOS: A History of Innovation INNOVATION MADE EXTREME SDK XML CLEAR-Flow Universal Port CLI Scripting 1 st modular OS for the LANs On-switch integration of third party applications Edge automation and cross- platform stacking Prebuilt scripts and OS extensions The next level in Quality of Service H-QoS Open XML interfaces delivered 2003 Page 5

High Performance Under Adverse Conditions Page 6 Modularity = Availability Without modularity …. Reboot entire OS to recover from process failure Reboot entire OS to add patches and features With modularity …. Self-healing process restart Dynamic software uploads ExtremeXOS shipping since December 2003 Others: talking about modularity since April 2004 An Extreme Networks ® Innovation ExtremeXOS ® Modular Operating System for High Availability

Availability Extremes highly flexible hardware and software solutions have enabled 24x7 availability Our manufacturing plants require a high level of availability and flexibility to keep the plant running. Extremes highly flexible hardware and software solutions have enabled us to build a network that supports 24x7 availability. Min-Kwan Kim IT Manager Hyundai Powertech (Hyundai Motor Company) Testimony Page 7

QoS Queues for Video, Voice, Data and Management Ingress QoS Rate Limiting Egress QoS Rate Shaping Protects Priority Traffic During Congestion Deterministic under high stress Ingress and Egress Queues Egress port limiter StrictPriorityorWFQ scheduler Egress queue Ingress Meter and Rate Limiting ACL Priority and min/max bandwidth configuration Ingress port Egress port Page 8 Summit X450e/a

High Performance Under Adverse Conditions Ethernet Automatic Protection Switching (EAPS) Page 9 Designed for carriersessential for convergence in the enterprise Proven sub-50ms failover times for voice-class connections* Featured on all Extreme Networks ® product lines IETF RFC 3619 * An Extreme Networks Innovation

Simplicity Page 10 Take Complexity Out of the System Simplified Administration Automation capabilities Centralized Policy Management Low power consumption by design Network managed power delivery On Products from Core to edge Simplifies Management Same OS across product line

Universal Port and Universal Port Manager Automated Rules Based Policy Allow/Deny Access Control Internal Resources Leverage Virtual Resources Automated Rules Based Policy Allow/Deny Access Control Internal Resources Leverage Virtual Resources Universal Port Manager Error checking Centralized deployment Universal Port Manager Error checking Centralized deployment Page 11 Bring Flexibility with Simplicity

Nathan Beemer Director of Computing and Telecommunications Services Simplicity Users at Kansas State University who are currently deploying a production VoIP system using the Extreme Universal Port estimate that the module will initially save roughly $85 per handset in reduced labor costs "The value is in allowing clients to connect to any port without any intervention on the client or the support staff's part. Page 12 Voice of the Customer

Joint Developed Solutions: Provisioning Page 13 Free Handset Auto-provisioning Widgets Scripts to support 802.1x and/or LLDP deployments of Avaya phones PreparationOperation Administrator Create Enterprise edge policies for Avaya IP Telephones Deploy Universal Port handset auto-provisioning script 1 2 Response: Configure Voice VLAN on switch port, provide phone with file server, call server and tag ID. Result: Avaya IP Telephone automatically joins the Voice VLAN updates its firmware and registers with Communication Manager Response: Configure Voice VLAN on switch port, provide phone with file server, call server and tag ID. Result: Avaya IP Telephone automatically joins the Voice VLAN updates its firmware and registers with Communication Manager Trigger Event: I am an Avaya IP Telephone model 9630, serial number , code version 2.0, etc. 3 4 LLDP-MED Example

Same OS from Edge to Core BlackDiamond BlackDiamond BlackDiamond 8806 Summit X450e Summit X450a Summit X250e Summit X150 Summit X650 Summit X350 ExtremeXOS 1G Edge 1G Aggregation 10/100 Edge 10G Aggregation Gigabit/10 Gigabit Core BlackDiamond 8810 SummitStack Page 14 Same OS, same Release, same Features* : ExtremeXOS !!

Products Use Less Energy and Lower OpEx Average Power Consumption in Watts Average Power Consumption of Core Switches BlackDiamond uses 3.4x less power on average than Catalyst 6509 and 2x less power than BigIron Rx-16 Source: The Tolly Group, January 2008 Average Watts consumed, and Projected 5-year energy costs in US Dollars Based on information in : The Tolly Group, July 2008, No Page 15

Save Even More $ with Universal Port Page 16 Application: Green power savings – the automated power down of a block of IP phones in an area of a building not regularly used at night or weekends PreparationOperation Administrator Create enterprise edge policies Deploy Automated Power Savings modules and policies to switches 1 2 Response: Universal Port (UP) setting triggers the application of the UP profiles to power off the IP handsets on specified edge ports. Result: Power savings for phones and supporting switch ports. Similar automation to power on before next shift. Response: Universal Port (UP) setting triggers the application of the UP profiles to power off the IP handsets on specified edge ports. Result: Power savings for phones and supporting switch ports. Similar automation to power on before next shift. Event: Time triggered event - at 5:00 PM at end of specified day shift 3 4

Simplicity Extreme Networks has saved us a lot of time –for example, on troubleshooting time alone. We have only five people to support all of our buildings, but everybody finds it so easy. Its very simple to work with, which allows us to focus on other things. Todd Costello IT Director Township of Middletown, NJ Voice of the Customer Page 17

Agility Page 18 Open, Converged Networks Solutions and Architecture that Scale Flexible Standards-Based Open Interfaces Joint Development Management, Monitoring, Automated Provisioning Low Risk Lab Validated Field Proven

Flexible Standards-Based interfaces Page 19

Joint Developed Solutions: Management Avaya Integrated Management/ EPICenter ® Integration Network management suites designed to work together as one Single point of management for voice and data systems Page 20

Joint Developed Solutions: Monitoring Page 21 Converged Network Analyzer (CNA) Plug-in Support Avaya software running onboard ExtremeXOS Simulates VoIP calls over the IP network Provides Mean Opinion Scoring (MOS) for voice over the network

Lab Validated Solutions Lower Risk Avaya Solutions and Interoperability Test Lab In depth solutions testing executed, often including voice and data traffic load simulations Test Plan and Application Notes created for each joint solution Over 50 Application Notes published as of September 2008 Reference: Avaya Resource Library - Application Notes - Extreme Networks Most recent solution tests completed BlackDiamond ® 8800 Tc and Te2 Modules Summit ® X350 Series Switches Summit X150 Series Switches Summit WM20 Switch Page 22

Bob Mays Director, Network & Communications, Villanova University Agility Last year Villanova University partnered with Avaya and Extreme Networks to install an IP enabled PBX with VOIP capabilities. The relationship has worked extremely well and I am pleased with the support levels of both organizations. Benefits are the ability to manage both the voice and data networks using one platform, better utilization of staff as both the voice and data network teams can now troubleshoot the same network and it positions the university to begin saving long distance expenses when we start sending outbound calls over the internet. Page 23

Joint Customers from Around the Globe Broad and Deep Experience Meeting Their Needs Page 24 Lund University NIT-Rourkela Ministry of Foreign Affairs, Mexico Royal Society for the Protection of Birds Royal Society for the Protection of Birds

Management - Insight and Control Enterprise Portfolio SecurityWireless Services - Proactive and Reactive Management - Insight and Control Page 25

Summary: Enabling Our Customers UC Productivity Delivered with Extreme Networks Agility Availability Simplicity Network Infrastructure forUC Page 26

Forward-looking Statements This presentation contains forward-looking statements that involve risks and uncertainties, including statements regarding our expectations as to products, trends and our performance. There can be no assurances that any forward-looking statements will be achieved, and actual results could differ materially from forecasts and estimates. For factors that may affect our business and financial results please refer to our filings with the Securities and Exchange Commission, including, without limitation, under the captions: Managements Discussion and Analysis of Financial Condition and Results of Operations, and Risk Factors, which is on file with the Securities and Exchange Commission ( We undertake no obligation to update the forward-looking information in this release. Page 27

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Extreme Networks/Avaya Strategic Alliance Page 31

The Innovative Summit X650 Extreme Networks – Data Center Leadership 10GbE switch with stacking across the edge portfolio 10GbE switch with 512Gbs stacking performance Enabling non-blocking connectivity between two Summit X650s – 480Gbps of bandwidth 10GbE switch with stacking across the edge portfolio Stack Summit X650, Summit X450 and Summit X250 Combine SummitStack and SummitStack512 into one virtual chassis 10GbE switch with 40GbE/100GbE future-proofing in 1RU Innovative 256Gbps expansion slot (VIM) technology company to offer a single operating system throughout From 10Mb through 10Gb stackable solutions and from edge to core chassis Page 32

Unified Communications Solutions Extreme Networks and Avaya © 2008 Extreme Networks, Inc. All rights reserved

Many disparate communications channels can lead to unproductive activity Todays Issues FAX Mobile Phone Video Office Phone Voice Mail Instant Message Text Message Headquarters Branch Offices Customers Remote Staff Page 34

One number for easy contact and one voice mail box Unified messaging provides one inbox for , voice mail, fax The Unified Communications Solution Headquarters Remote Staff Branch Offices Customers Availability/Presence increases responsiveness & simplifies routing to experts Collaboration simplified by secure IM, web, audio and video conferencing Converged network lowers the cost administration Enables CEBP Page 35

Source: Avaya March 2008 In AAU UC solutions presentation Small Business Mobile BenefitsTeleworker Benefits Home Agents Business Continuity Same HQ Communications experience wherever you are Greening benefits of Remote worker Streamline IT operations Lowering mobile communications costs Secured fixed-mobile convergence environments Increased productivity for mobile professionals Reduced operating costs Improve agent job satisfaction Increased agent productivity Reduced costs Responsive & loyal employees Increased Productivity: The Benefit of UC Page 36

JITC Validated Solutions Tested by Defense Information Systems Agency (DISA) Joint Interoperability Test Command (JITC) Certified Required by United States Military divisions Approved for Assured Services Voice Application Local Area Network (ASVALAN) Tested and approved for deployment with Avaya Communication Manager Page 37