Cisco\u00a0Thursday announced it has filed a lawsuit against Chinese network equipment maker Huawei Technologies and its subsidiaries, claiming unlawful copying of Cisco\u2019s intellectual property.Cisco\u00a0Thursday announced it has filed a lawsuit against Chinese network equipment maker\u00a0Huawei Technologies\u00a0and its subsidiaries, claiming unlawful copying of Cisco\u2019s intellectual property.Huawei has emerged recently as a significant low-cost competitor to Cisco. Cisco CEO John Chambers\u00a0was asked recently\u00a0about the possibility of Huawei violating Cisco's intellectual property rights, to which he responded that he had confidence that the Chinese government and World Trade Organization would "do the right thing" to prevent or stop unfair business practices.Today, Cisco took the offensive. Its suit, filed in the U.S. District Court for the Eastern District of Texas, alleges that Huawei unlawfully copied and misappropriated Cisco\u2019s\u00a0IOS\u00a0software, including source code, copied Cisco documentation and other copyrighted materials, and infringed numerous Cisco patents.Cisco seeks remedies to prohibit the continued misappropriation of its intellectual property by Huawei and recover damages resulting from Huawei\u2019s "illegal" actions, the company says. Cisco also served a cease-and-desist letter on Spot Distribution, a Huawei distributor located in the United Kingdom, for distributing Huawei products that copy Cisco\u2019s intellectual property.\u00a0\u201cHuawei has unlawfully copied Cisco\u2019s intellectual property and refused Cisco\u2019s numerous attempts to resolve these issues,\u201d said Mark Chandler, vice president and general counsel for Cisco, in a statement. \u201cAs a result, Cisco has no choice but to protect its technology and the interests of its shareholders through legal action.\u201dIn a statement, Huawei said it is consulting with legal advisors to understand and resolve the matter and does not have any comment at this time.Huawei said that the company and its subsidiaries "have always respected intellectual property rights and have attached importance to safeguarding its own intellectual property rights." Huawei says it employs 10,000 engineers and spends 10% of revenue to develop its own core technology. "As a responsible corporate citizen, Huawei respects the laws and regulations of each country in which it has operations. Huawei believes in the value of partnership, open co-operation and fair competition and has been implementing such beliefs in practice," the company states.Cisco alleges that Huawei copied portions of the Cisco IOS source code and included the technology in its operating system for its Quidway routers and switches. Huawei\u2019s operating system contains a number of text strings, file names, and bugs that are identical to those found in Cisco\u2019s IOS source code, Cisco alleges.Cisco also claims that Huawei copied extensively from Cisco\u2019s copyrighted technical documentation and included whole portions of Cisco\u2019s text in Huawei\u2019s user manuals for Quidway routers and switches.In addition, Cisco charges that Huawei copied Cisco\u2019s command line interface (CLI) and corresponding screen displays. "Extensive" portions of Cisco\u2019s CLI and help screens appear verbatim in Huawei\u2019s operating system for its Quidway routers and switches, Cisco asserts.Lastly, Cisco charges that Huawei is infringing at least five Cisco patents related to proprietary routing protocols and has included these technologies in its Quidway routers and switches. \u00a0Cisco is seeking a preliminary and permanent injunction prohibiting Huawei from using, selling, marketing or distributing versions of their Quidway routers and switches that infringe Cisco\u2019s intellectual property. Cisco also is seeking monetary damages as compensation for Huawei\u2019s misappropriation of Cisco\u2019s intellectual property.