Exhibit 99.1

CISCO REPORTS THIRD QUARTER EARNINGS

SAN JOSE, Calif. — May 17, 2017 — Cisco today reported third quarter results for the period ended April 29, 2017. Cisco reported third quarter revenue of $11.9 billion, net income on a generally accepted accounting principles (GAAP) basis of $2.5 billion or $0.50 per share, and non-GAAP net income of $3.0 billion or $0.60 per share.

“I am pleased with the progress we are making on the multi-year transformation of our business,” said Chuck Robbins, CEO, Cisco. “The Network is becoming even more critical to business success as our customers add billions of new connections to their enterprises. We are laser focused on delivering unparalleled value through highly secure, software-defined, automated and intelligent infrastructure.”

GAAP Results

Non-GAAP Results

The third quarter of fiscal 2017 had 13 weeks compared with 14 weeks in the third quarter of fiscal 2016.

Reconciliations between net income, EPS and other measures on a GAAP and non-GAAP basis are provided in the tables located in the section entitled “Reconciliations of GAAP to non-GAAP Measures.”

“We executed well in Q3, delivering $11.9 billion in total revenue, while driving solid profitability and cash generation as we deliver on our strategic priorities,” said Kelly Kramer, CFO, Cisco. “We will continue to invest in growth areas as we move the business toward more software and recurring revenue and return value to shareholders.”

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Financial Summary

All comparative percentages are on a year-over-year basis unless otherwise noted.

Q3 FY 2017 Highlights

Revenue — Total revenue was $11.9 billion, down 1%, with product revenue flat and service revenue down 2%. 31% of total revenue was from recurring offers, up from 29% for the third quarter of fiscal 2016. Revenue by geographic segment was: Americas flat, EMEA flat, and APJC down 2%. Product revenue performance was led by Wireless and Security, which increased by 13% and 9%, respectively. Switching revenue increased by 2%. NGN Routing, Collaboration, Data Center, and Service Provider Video revenue decreased by 2%, 4%, 5%, and 30%, respectively.

Gross Margin — On a GAAP basis, total gross margin and product gross margin were 63.0% and 61.7%, respectively. The decrease in the product gross margin compared with 63.8% in the third quarter of fiscal 2016 was primarily due to pricing, a supplier component remediation adjustment in the third quarter of fiscal 2016, and product mix, partially offset by continued productivity improvements.

Non-GAAP total gross margin and product gross margin were 64.4% and 63.2%, respectively. The decrease in non-GAAP product gross margin compared with 64.5% in the third quarter of fiscal 2016 was primarily due to pricing and product mix, partially offset by continued productivity improvements.

GAAP service gross margin was 66.7% and non-GAAP service gross margin was 67.8%.

Total gross margins by geographic segment were: 64.6% for the Americas, 65.5% for EMEA and 61.8% for APJC.

Operating Expenses — On a GAAP basis, operating expenses were $4.3 billion, down 8%. Non-GAAP operating expenses were $3.8 billion, down 9%, and were 32.1% of revenue.

Operating Income — GAAP operating income was $3.2 billion, up 6%, with GAAP operating margin of 26.5%. Non-GAAP operating income was $3.9 billion, up 7%, with non-GAAP operating margin at 32.3%.

Provision for Income Taxes — The GAAP tax provision rate was 21.2%. The non-GAAP tax provision rate was 22.0%.

Net Income and EPS — On a GAAP basis, net income was $2.5 billion and EPS was $0.50. On a non-GAAP basis, net income was $3.0 billion, an increase of 5%, and EPS was $0.60, an increase of 5%.

Cash Flow from Operating Activities — was $3.4 billion, an increase of 10% compared with $3.1 billion for the third quarter of fiscal 2016.

Balance Sheet and Other Financial Highlights

Cash and Cash Equivalents and Investments — were $68.0 billion at the end of the third quarter of fiscal 2017, compared with $71.8 billion at the end of the second quarter of fiscal 2017, and compared with $65.8 billion at the end of fiscal 2016. The total cash and cash equivalents and investments available in the United States at the end of the third quarter of fiscal 2017 were $2.9 billion.

Deferred Revenue — was $17.3 billion, up 13% in total, with deferred product revenue up 26%, driven largely by subscription-based and software offerings. Deferred service revenue was up 7%. The portion of product deferred revenue related to recurring software and subscription businesses grew 57% which includes the acquisition during the third quarter of fiscal 2017 of AppDynamics. Excluding AppDynamics, the increase was 51%.

Capital Allocation — In the third quarter of fiscal 2017, Cisco declared and paid a cash dividend of $0.29 per common share, or $1.5 billion. For the third quarter of fiscal 2017, Cisco repurchased approximately 15 million shares of common stock under its stock repurchase program at an average price of $33.71 per share for an aggregate purchase price of $0.5 billion.

As of April 29, 2017, Cisco had repurchased and retired 4.7 billion shares of Cisco common stock at an average price of $21.21 per share for an aggregate purchase price of approximately $99.1 billion since the inception of the stock repurchase program. The remaining authorized amount for stock repurchases under this program is approximately $12.9 billion with no termination date.

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Acquisitions

In the third quarter of fiscal 2017, Cisco completed its acquisition of AppDynamics, Inc. The AppDynamics acquisition provides cloud application and business monitoring platforms that are designed to enable companies to improve application and business performance.

On May 1, 2017, Cisco announced its intent to acquire Viptela, Inc., a privately held software-defined wide area network company. The acquisition is expected to close in the second half of calendar 2017.

On May 4, 2017, Cisco announced its intent to acquire the Advanced Analytics team and associated advanced analytics intellectual property developed by Saggezza, a privately held technology services company. The acquisition is expected to close in the fourth quarter of fiscal 2017.

On May 11, 2017, Cisco announced its intent to acquire MindMeld, Inc., a privately held artificial intelligence (AI) company. The acquisition is expected to close in the fourth quarter of fiscal 2017.

Business Outlook for Q4 FY 2017

Cisco expects to achieve the following results for the fourth quarter of fiscal 2017:

Cisco estimates that GAAP EPS will be $0.46 to $0.51 which is lower than non-GAAP EPS by $0.11 to $0.14 per share in the fourth quarter of fiscal 2017.

A reconciliation between the Business Outlook for Q4 FY 2017 on a GAAP and non-GAAP basis is provided in the table entitled “GAAP to non-GAAP Business Outlook for Q4 FY 2017” located in the section entitled “Reconciliations of GAAP to non-GAAP Measures.”

Editor’s Notes:

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CISCO SYSTEMS, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(In millions, except per-share amounts)

(Unaudited)

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CISCO SYSTEMS, INC.

REVENUE BY SEGMENT

(In millions, except percentages)

During the second quarter of fiscal 2016 on November 20, 2015, Cisco completed its divestiture of the SP Video CPE Business. SP Video CPE Business revenue for the nine months ended April 30, 2016 was $504 million.

CISCO SYSTEMS, INC.

GROSS MARGIN PERCENTAGE BY SEGMENT

(In percentages)

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CISCO SYSTEMS, INC.

REVENUE FOR GROUPS OF SIMILAR PRODUCTS AND SERVICES

(In millions, except percentages)

⁽¹⁾ During the second quarter of fiscal 2016 on November 20, 2015, Cisco completed its divestiture of the SP Video CPE Business. SP Video CPE Business revenue for the nine months ended April 30, 2016 was $504 million.

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CISCO SYSTEMS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(In millions)

(Unaudited)

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CISCO SYSTEMS, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In millions)

(Unaudited)

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CISCO SYSTEMS, INC.

DEFERRED REVENUE

(In millions)

CISCO SYSTEMS, INC.

DIVIDENDS PAID AND REPURCHASES OF COMMON STOCK

(In millions, except per-share amounts)

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CISCO SYSTEMS, INC.

RECONCILIATIONS OF GAAP TO NON-GAAP MEASURES

GAAP TO NON-GAAP NET INCOME

(In millions, except per-share amounts)

⁽¹⁾ During the second quarter of fiscal 2016 on November 20, 2015, Cisco completed its divestiture of the SP Video CPE Business. This sale resulted in a pre-tax gain of $285 million, net of certain transaction costs incurred. The gain on this transaction was excluded from non-GAAP net income for the first nine months of fiscal 2016.

⁽²⁾ Cisco recorded certain net tax benefits totaling $465 million related to prior-year periods that were excluded from non-GAAP net income for the first nine months of fiscal 2016.

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CISCO SYSTEMS, INC.

RECONCILIATIONS OF GAAP TO NON-GAAP MEASURES

EFFECTIVE TAX RATE

(In percentages)

GAAP TO NON-GAAP BUSINESS OUTLOOK FOR Q4 FY 2017

⁽¹⁾ In August 2016, we announced a restructuring plan in order to reinvest in our key priority areas in which up to 5,500 employees would be impacted, with estimated pretax charges of approximately $700 million. In May 2017, we extended the restructuring plan to include an additional 1,100 employees with $150 million of estimated additional pretax charges. During the first nine months of fiscal 2017, we have recognized pretax charges of $614 million to our GAAP financial results in relation to this restructuring plan. We expect to recognize approximately $150 million to $200 million of pretax charges under this plan in the fourth quarter of fiscal 2017. We expect this plan to be substantially completed by the end of the first quarter of fiscal 2018.

⁽²⁾ Estimated adjustments to GAAP earnings per share are shown after income tax effects.

Except as noted above, this business outlook does not include the effects of any future acquisitions/divestitures, asset impairments, restructurings and significant tax matters or other events, which may or may not be significant unless specifically stated.

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Forward Looking Statements, Non-GAAP Information and Additional Information

This release may be deemed to contain forward-looking statements, which are subject to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among other things, statements regarding future events (such as our progress on the multi-year transformation of our business, our ability to deliver value to our customers through highly secure, software-defined, automated and intelligent infrastructure, our ability to deliver on our strategic priorities, our investment in growth areas, the transition of our business to software and recurring revenues, and our ability to continue to execute well and return value to our shareholders) and the future financial performance of Cisco (including the business outlook for Q4 FY 2017) that involve risks and uncertainties. Readers are cautioned that these forward-looking statements are only predictions and may differ materially from actual future events or results due to a variety of factors, including: business and economic conditions and growth trends in the networking industry, our customer markets and various geographic regions; global economic conditions and uncertainties in the geopolitical environment; overall information technology spending; the growth and evolution of the Internet and levels of capital spending on Internet-based systems; variations in customer demand for products and services, including sales to the service provider market and other customer markets; the return on our investments in certain priorities, key growth areas, and in certain geographical locations, as well as maintaining leadership in routing, switching and services; the timing of orders and manufacturing and customer lead times; changes in customer order patterns or customer mix; insufficient, excess or obsolete inventory; variability of component costs; variations in sales channels, product costs or mix of products sold; our ability to successfully acquire businesses and technologies and to successfully integrate and operate these acquired businesses and technologies; our ability to achieve expected benefits of our partnerships; increased competition in our product and service markets, including the data center market; dependence on the introduction and market acceptance of new product offerings and standards; rapid technological and market change; manufacturing and sourcing risks; product defects and returns; litigation involving patents, intellectual property, antitrust, shareholder and other matters, and governmental investigations; our ability to achieve the benefits of the announced restructuring and possible changes in the size and timing of the related charges; man-made problems such as cyber-attacks, data protection breaches, computer viruses or terrorism; natural catastrophic events; a pandemic or epidemic; our ability to achieve the benefits anticipated from our investments in sales, engineering, service, marketing and manufacturing activities; our ability to recruit and retain key personnel; our ability to manage financial risk, and to manage expenses during economic downturns; risks related to the global nature of our operations, including our operations in emerging markets; currency fluctuations and other international factors; changes in provision for income taxes, including changes in tax laws and regulations or adverse outcomes resulting from examinations of our income tax returns; potential volatility in operating results; and other factors listed in Cisco’s most recent reports on Forms 10-Q and 10-K filed on February 21, 2017 and September 8, 2016, respectively. The financial information contained in this release should be read in conjunction with the consolidated financial statements and notes thereto included in Cisco’s most recent reports on Forms 10-Q and 10-K as each may be amended from time to time. Cisco’s results of operations for the three and nine months ended April 29, 2017 are not necessarily indicative of Cisco’s operating results for any future periods. Any projections in this release are based on limited information currently available to Cisco, which is subject to change. Although any such projections and the factors influencing them will likely change, Cisco will not necessarily update the information, since Cisco will only provide guidance at certain points during the year. Such information speaks only as of the date of this release.

This release includes non-GAAP net income, non-GAAP gross margins, non-GAAP operating expenses, non-GAAP operating income and margin, non-GAAP effective tax rates, and non-GAAP net income per share data for the periods presented. It also includes future estimated ranges for gross margin, operating margin, tax provision rate and EPS on a non-GAAP basis.

These non-GAAP measures are not in accordance with, or an alternative for, measures prepared in accordance with generally accepted accounting principles and may be different from non-GAAP measures used by other companies. In addition, these non-GAAP measures are not based on any comprehensive set of accounting rules or principles. Cisco believes that non-GAAP measures have limitations in that they do not reflect all of the amounts associated with Cisco’s results of operations as determined in accordance with GAAP and that these measures should only be used to evaluate Cisco’s results of operations in conjunction with the corresponding GAAP measures.

Cisco believes that the presentation of non-GAAP measures when shown in conjunction with the corresponding GAAP measures, provides useful information to investors and management regarding financial and business trends relating to its financial condition and its historical and projected results of operations.

For its internal budgeting process, Cisco’s management uses financial statements that do not include, when applicable, share-based compensation expense, amortization of acquisition-related intangible assets, acquisition-related/divestiture costs, significant asset impairments and restructurings, significant litigation and other contingencies, significant gains and losses on investments, the income tax effects of the foregoing and significant tax matters. Cisco’s management also uses the foregoing non-GAAP measures, in addition to the corresponding GAAP measures, in reviewing the financial results of Cisco. In prior periods, Cisco has excluded other items that it no longer excludes for purposes of its non-GAAP financial measures. From time to time in the future there may be other items that Cisco may exclude for purposes of its internal budgeting process and in reviewing its financial results. For additional information on the items excluded by Cisco from one or more of its non-GAAP financial measures, refer to the Form 8-K regarding this release furnished today to the Securities and Exchange Commission.

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Cisco divested the Customer Premises Equipment portion of the Service Provider Video Connected Devices business (“SP Video CPE Business”) during the second quarter of fiscal 2016 on November 20, 2015. This release includes, where indicated, financial measures that exclude the SP Video CPE Business. Cisco believes that the presentation of these measures provides useful information to investors and management regarding financial and business trends relating to its financial condition and its historical and projected results of operations because the SP Video CPE Business is no longer part of Cisco and will not be part of Cisco on a go forward basis. Cisco’s management also uses the financial measures excluding the SP Video CPE Business in reviewing the financial results of Cisco.

About Cisco

Cisco (NASDAQ: CSCO) is the worldwide technology leader that has been making the Internet work since 1984. Our people, products and partners help society securely connect and seize tomorrow’s digital opportunity today. Discover more at thenetwork.cisco.com and follow us on Twitter at @Cisco.

Copyright ^© 2017 Cisco and/or its affiliates. All rights reserved. Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to: www.cisco.com/go/trademarks. Third-party trademarks mentioned in this document are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. This document is Cisco Public Information.

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