Cisco Systems (CSCO)

IMPORTANT ADDITIONAL INFORMATION WILL BE FILED WITH THE SEC

Starent Networks plans to file with the SEC and mail to its stockholders a Proxy Statement in connection with the transaction. The Proxy Statement will contain important information about Cisco, Starent Networks, the transaction and related matters. Investors and security holders are urged to read the Proxy Statement carefully when it is available.

Investors and security holders will be able to obtain free copies of the Proxy Statement and other documents filed with the SEC by Cisco and Starent Networks through the website maintained by the SEC at www.sec.gov.

In addition, investors and security holders will be able to obtain free copies of the Proxy Statement from Starent Networks by contacting Starent Networks Investor Relations at 978-863-3743.

Cisco and Starent Networks, and their respective directors and executive officers, may be deemed to be participants in the solicitation of proxies in respect of the transactions contemplated by the merger agreement. Information regarding Cisco’s directors and executive officers is contained in Cisco’s Annual Report on Form 10-K for the year ended July 25, 2009 and its proxy statement dated September 17, 2009, which are filed with the SEC. Information regarding Starent Networks’ directors and executive officers is contained in Starent Networks’ Annual Report on Form 10-K for the year ended December 31, 2008 and its proxy statement dated April 7, 2009, which are filed with the SEC. As of September 30, 2009, Starent Networks’ directors and executive officers beneficially owned approximately 15,619,972 shares, or 21 percent, of Starent Networks’ common stock. In addition, Starent Networks has entered into retention agreements with its executive officers, which are described in a Current Report on Form 8-K filed by Starent Networks with the SEC on June 11, 2009, and certain of the officers are entering into employment agreements with Cisco, which will become effective as of the closing of the transaction. A more complete description of these agreements and the interests of the officers and directors will be available in the Proxy Statement.