SAN FRANCISCO — Cisco Systems Inc. expanded its intellectual property litigation against competitor Arista Networks Inc. to the U.S. International Trade Commission on Friday, while Arista slammed Cisco’s “armies of lawyers and P.R. agents” and began previewing an interoperability defense.

Cisco sued Arista in San Francisco federal court two weeks ago, alleging that former Cisco employees who now run the cloud networking company have “blatantly incorporated” Cisco technology into their new products. Cisco general counsel Mark Chandler wrote in a blog post that “copying was a strategy, not an accident” at Arista, and that the company plagiarized Cisco user manuals and hundreds of command line expressions from Cisco’s operating system.

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