The two are the latest to publicly support Microsoft in its protest of a search warrant for customer emails stored abroad.
The CEO of the networking giant warns that revelations of NSA spying are undermining confidence in the tech industry.
The major security vulnerability affects networking equipment used to connect to the Web, the companies warn.
The Internet of everything will have five to 10 times the impact on society as the Internet itself, says Cisco CEO John Chambers.
The agreement marks the latest collaboration among tech giants. In the past weeks, Samsung also reached deals with Google and Ericsson.
The new patent cross-licensing agreement is designed to protect both companies from patent lawsuits.
A European court rejects Cisco's appeal to quash the merger as approved based on concerns that it would create a monopoly.
Chinese antitrust regulators also raided the offices of IT firm Accenture, one of the software giant's consulting partners.
Chinese officials no longer approve the use of the two antivirus software vendors, according to reports.
Microsoft had sought to prevent the Justice Department from obtaining emails in Ireland without first getting the country's consent.