Vendor lineage
Cisco Systems
Did not invent the router, but was the first to sell one that spoke everybody's protocol at once.
Leonard Bosack and Sandy Lerner founded Cisco in December 1984, having worked on connecting incompatible networks at Stanford. The name is the tail of San Francisco and the logo is the Golden Gate Bridge, which tells you the whole company began as a local problem.
The problem was that the campus ran several networks that could not talk to each other, each with its own protocol. The multiprotocol router - one box that spoke TCP/IP, AppleTalk, IPX, DECnet and the rest simultaneously - was the answer, and it arrived exactly as organisations everywhere discovered they had the same mess.
That timing is most of the explanation for what followed. Cisco did not have to persuade anyone that internetworking mattered; it had to be the company with a shipping product when they worked it out for themselves. IOS became the language enterprise networking was described in, to the point that competitors shipped IOS-like command lines because that was what operators already knew.
The acquisition machine was the other half. Cisco bought more than two hundred companies, and the strategy was explicit: buy the category rather than build it, integrate the technology into the portfolio, and use the channel to sell it. Crescendo in 1993 became Catalyst. Grand Junction became Fast Ethernet. IronPort, which appears on this timeline in its own right, became the email security line in 2007. Splunk, also here, became the observability and security data business in 2024 at around $28B - the largest purchase in company history.
The certification programme deserves its own mention, because it changed how the industry hires. CCNA, CCNP and CCIE created a vendor-defined competency ladder that employers treated as a proxy for skill, and every vendor on this site with a certification track is working from a template Cisco established.
It has been challenged in every segment it occupies and has lost ground in several, but the shape of enterprise networking - the vocabulary, the certification model, the assumption that one vendor can supply the whole stack - is substantially Cisco's design.
Founding stories
Cisco Systems
A married couple ran computer facilities 500 yards apart at Stanford - Bosack (ex-DEC, PDP-10 memory architecture) in Computer Science, Lerner at the Graduate School of Business - and built a multiprotocol router to connect their departments. They incorporated on December 10, 1984 with colleagues Greg Setz, Bill Westfield, and Kirk Lougheed, naming the company for San Francisco while driving across the Golden Gate Bridge - the logo is the bridge's towers. Stanford forced Bosack and Lougheed out on July 11, 1986 and weighed criminal complaints before settling: a 1987 license for exactly $169,300. Roughly 80 venture capitalists said no before Don Valentine of Sequoia said yes, took control in 1988, and installed John Morgridge as CEO. Cisco went public in February 1990 at a $224 million valuation; by August, Lerner had been fired and Bosack had quit. The founders never saw the empire from inside.
The timeline
- Founded from a campus problem
December 10, 1984: the multiprotocol router that connected Stanford's incompatible departmental networks becomes a company - commercializing the technology that would carry the Internet era.
- First router ships; Stanford strikes
The first commercial TCP/IP router ships the same year Stanford forces the founders' resignations over intellectual property. The 1987 settlement licenses the software and two boards to Cisco for $169,300 - possibly the worst deal a university ever made.
- IPO, and the founders exit
February 1990: Cisco lists on NASDAQ at a $224 million market cap. Within months Sandy Lerner is fired and Leonard Bosack resigns; over the following decade the stock gains roughly 30,000 percent without them.
- The Boeing ultimatum: Crescendo
Negotiating a $10 million router order, Boeing tells John Chambers there is no deal unless Cisco works with Mario Mazzola's Crescendo Communications. On September 24, 1993 - after seven years of building only - Cisco buys Crescendo for roughly $90 million. It becomes the Catalyst switching line, and Crescendo's Mazzola and Jayshree Ullal build Cisco switching into a $15 billion business.
Cisco 10-K FY1996 (6.8M shares, pooling); price reported between $89M and $97M across accounts.
- Kalpana, and the first billion
December 1994: Cisco acquires Ethernet-switching pioneer Kalpana for about $204 million in stock (13.6 million shares) - the company where Riverstone co-founder Romulus Pereira had built switching engines. The same fiscal year, revenue passes $1 billion for the first time ($1.24 billion, up 92 percent).
- Chambers takes over
John Chambers succeeds Morgridge as CEO and runs the company for twenty years - the acquisition machine's architect and the bubble era's most visible executive.
- StrataCom: the first mega-deal
ATM and Frame Relay maker StrataCom, at about $4.5 billion in stock, is Cisco's biggest purchase yet and the first for which it hires an underwriter - the machine graduates from friendly startup tuck-ins to market-shaping deals.
Reported between $4.0B and $4.67B across accounts.
- Seventeen companies in one year
The buying peak: 17 acquisitions in 1999 alone, led by optical-transport maker Cerent at approximately $6.9 billion (98.1 million shares, per Cisco's own 10-Q), plus GeoTel ($1.9B), Aironet wireless ($800M), and Pirelli's optical business.
- The summit
March 2000: Cisco's market capitalization passes $500 billion and it becomes the most valuable company in the world, surpassing Microsoft. In May it pays about $5.7 billion for content-switch maker ArrowPoint - the Alteon rival. Then the bubble bursts: 80 percent of the value is gone by 2002.
- My era opens: LinksysMy chapter
March 20, 2003: Cisco announces the ~$500 million acquisition of Linksys, entering home networking as broadband spreads. The same year, I join Cisco in Brasilia - the recovering giant's government-sector front line in Brazil.
Cisco SEC 8-K, Mar 20, 2003; closed June 2003.
- CRS-1: a Guinness record
May 25, 2004: the Carrier Routing System debuts - 92 terabits per second, the industry's first true 40-Gbps interface, and a new operating system (IOS XR) built for it. On July 1, Guinness World Records certifies it as the highest-capacity Internet router ever - the first networking technology in the record book. Fitting bookend: the same quarter, Boeing announces it will converge 150,000 employees onto Cisco IP communications.
Cisco 8-K FY2004; Cisco newsroom; InfoWorld.
- The machine's largest meal
March 2024: the $28 billion Splunk acquisition closes - the biggest in Cisco's history, pointing the four-decade acquirer at security analytics and AI. Under Chuck Robbins (CEO since 2015), the company that joined the Dow in 2009 runs at roughly $56 billion in annual revenue - the only 1990s networking giant still setting the terms.
Flagship products and solutions
- IOS and IOS XRThe operating system whose command line became the industry's lingua franca - and the modular XR rebuild created for the CRS-1's always-on carrier world.
- CatalystThe switching dynasty born from Crescendo in 1993 - the wiring-closet and campus standard that outlasted every hub-era rival on this site's other pages.
- CRS and the carrier coreThe 92-Tbps Guinness-record Carrier Routing System (2004) and its descendants - the multichassis core of IP next-generation networks.
- NexusData-center switching from the Nuova spin-in - Mazzola's second act - including Fibre Channel over Ethernet with the Nexus 5000.
- Security and observabilityFrom PIX and ASA through Sourcefire and Duo to the $28 billion Splunk platform - the acquisition machine assembling a security business at Cisco scale.
Key innovations
- Commercializing the multiprotocol routerCisco did not invent routing - it made routing a product, then a market, then the substrate of the commercial Internet.
- Acquisition as R&DFrom the Boeing-forced Crescendo deal onward, buying became half of Cisco's business activity by its own history - a model the industry named 'A&D' and imitated for thirty years.
- The spin-inMazzola's Andiamo and Nuova were founded, funded, and reabsorbed by design - storage networking and the Nexus line built as startups with a guaranteed buyer.
- The talent flywheelAcquisitions delivered people who built the next decade: Mazzola and Ullal from Crescendo, Bechtolsheim via Granite - and their departures seeded rivals like Arista, where Ullal is CEO.
Main markets
Cisco is the constant on every other page of this section: the rival Wellfleet held to 20 percent, the winner of the hub wars against Cabletron and SynOptics, Brocade's only SAN peer, the standard Nortel and Bay could not beat, and - per the DOJ's 2025 HPE-Juniper settlement - still, with HPE, more than 70 percent of US enterprise networking four decades on.
My chapter was Brasilia, 2003-2004: the government-sector front line in Brazil, in the narrow window between the post-bubble trough and the CRS-1's Guinness record - the giant relearning how to grow.
Analyst standing
- March 2000: a market capitalization above $500 billion made Cisco the most valuable company in the world - followed by an 80 percent fall by 2002, the era's defining round trip.
- Per Wikipedia's acquisition history, purchases have constituted 50 percent of Cisco's business activity since 1993 - roughly 170 companies by late 2014, crowned by the $28 billion Splunk close in March 2024.
Acquisitions
1993 Crescendo Communications $95M
Switching technology, and Cisco's first major acquisition.
The Catalyst line, which became the dominant enterprise switch family for two decades.
2007 IronPort Systems ~$830M
Email security built on sender reputation rather than content inspection.
- 2000 IronPort's SenderBase approach (origin, not a purchase) — Founded on the argument that WHO sends a message predicts spam better than what it contains - an argument cloud security has repeated ever since.
Cisco Email Security Appliance. IronPort has its own entry on this timeline.
2024 Splunk ~$28B
Machine data search, observability and security analytics. Announced September 2023, completed 18 March 2024.
Cisco's security and observability business, and the largest acquisition it has ever made. Splunk has its own entry here.