Networking giant Cisco Systems Inc. has reached a $400 million settlement in its wide-ranging, three-and-a-half-year-old intellectual property dispute with Arista Networks Inc.

With opening statements in Arista’s antitrust countersuit just hours away Monday in San Jose, the parties announced a nearly global settlement for litigation over Ethernet switches that spans federal court, the U.S. International Trade Commission and the Patent Trial and Appeal Board.