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BT Exact Validates High Availability Features of Juniper Networks T640 Routing Platform

Industry's Premier Core Platform Showcases Hitless Software Upgrades, Resilient Failover Capabilities

SUNNYVALE, CA, August 18, 2004 - Juniper Networks, Inc. (Nasdaq: JNPR) today announced the results of extensive testing verified by BT Exact, BT's technology and IT operations division, confirming the advanced high availability features of the T640 routing platform. The T-series is the industry's most proven core platform and delivers unmatched high availability, reliability and intelligent services at multi-terabit scale. Shipping since April 2002, the T-series has been deployed by more than 60 customers in production networks worldwide.

"Service providers and vendors rely on our testing to independently verify critical features, such as performance and high availability, under real-world conditions," said Tony Dann, head of IP test and evaluation at BT Exact. "This is our second T640 test and after initially confirming the T640's impressive overall performance capabilities, we have now been able to validate its high availability features. In this round of high availability features testing, the results confirm the Juniper Networks T640 performed admirably in each major component."

Availability is expressed as a measurement of a device, system, or service's readiness to perform under duress according to predefined performance conditions and criteria. Juniper Networks solutions are designed to achieve optimal reliability and availability, enabling service providers to deliver an assured experience to their customers and support business critical applications as a foundation for Infranets. An Infranet is a network that combines the ubiquitous connectivity of the Internet with the assured performance and security of a private network.

The testing highlights three major components of high availability functionality; control plane resiliency, forwarding plane failovers and in-service software upgrades. The tests validated that the T640 was capable of this functionality and would continue packet forwarding during these events with both a large number of peers and a large number of routes configured. One of the main features of the T640 that provides the capability to achieve non-stop forwarding is its rich support for the graceful restart protocol extensions. For more detail, the technical report can be found at: https://www.juniper.net/products/tseries/bt_t640.pdf.

"As service providers and their customers deploy mission critical applications over IP, high availability has become a mandatory requirement when evaluating routing platforms," said Karen Livoli, senior portfolio marketing manager, Juniper Networks. "Our Infranet-ready T-series enables service providers to deliver an assured experience over a highly virtual network. The T-series with JUNOS software has set the industry benchmark for a highly available, intelligent and secure core network infrastructure."

About BT

BT Group plc is the holding company for an integrated group of communications businesses and is listed on stock exchanges in London and New York. British Telecommunications plc (BT) is a wholly-owned subsidiary of BT Group and encompasses virtually all businesses and assets of the BT Group. BT is one of the world's leading providers of communications solutions serving customers in Europe, the Americas and Asia Pacific. Its principal activities include network centric Information and Communications Technology (ICT) solutions, local, national and international telecommunications services, and higher-value broadband and internet products and services.. BT consists principally of three lines of business: BT Retail, providing fixed and mobile communications services and solutions to over 20 million residential and business-to-business and residential customers in the UK. It is also a leading UK internet services provider. BT Wholesale, providing network services and solutions within the UK to over 600 fixed and mobile operators and to service providers including the provision of ADSL broadband, Private Circuits and PSTN. BT Global Services, providing international carrier services, and ICT services internationally to meet the needs of multi-site organisations with European operations. BT Global Services operates in 136 countries and also offers international carrier services. In the year ended 31 March 2004, BT Group's turnover was £18,519 million with profit before goodwill amortisation, exceptional items and taxation of £2,013 million. For more information, visit www.btplc.com.

About BT Exact

BT Exact is BT's technology and IT operations division. It specialises in telecommunications engineering, leading-edge network design, IT system and application development and has extensive expertise in business consulting and human factors. Its knowledge helps its customers across BT Group and in selected other businesses gain maximum advantage from their investments in communications networks and IT systems, develop new capabilities and open new opportunities. BT Exact brings together the technological expertise of BT's research laboratories and the operational experience of the teams that design and operate BT's IT systems. Backed by a team of over 6,000 technologists, it is active and influential in setting global standards. BT Exact builds on the insights and expertise developed by its research to address the demands of the next-generation internet, as well as advanced data services, information and network security, and software systems to support communications networks worldwide. For more information about BT Exact, please go to www.bt.com/btexact.

About Juniper Networks, Inc.

Juniper Networks transforms the business of networking by converting a commodity - bandwidth - into a dependable, secure and highly valuable corporate asset. Founded in 1996 to meet the stringent demands of service providers, Juniper Networks is now relied upon by the world's leading network operators, government agencies, research and education institutions, and information-intensive enterprises as the foundation for uncompromising networks. The Infranet Initiative uses Juniper Networks MINT (Model for InfraNet Transformation) as its underlying framework. Juniper Networks is headquartered in Sunnyvale, California. Additional information can be found at www.juniper.net.

Juniper Networks, the Juniper Networks logo, NetScreen, NetScreen Technologies, the NetScreen logo, NetScreen-Global Pro, ScreenOS, and GigaScreen are registered trademarks of Juniper Networks, Inc. in the United States and other countries.

T640 and T-series are trademarks of Juniper Networks, Inc.