Cisco Systems Inc. is investigating whether some of its activities in Russia and nearby countries may have violated a U.S. law that bans bribes to foreign officials.

The probe was discussed by the company in a blog post in December and a public filing in February but attracted little attention.

Cisco, the maker of networking equipment, in the filing said the investigation began at the request of the U.S. Securities and Exchange Commission and Justice Department. The company and U.S. regulators received allegations that business activities of some of its operations and resellers in Russia and the Commonwealth of Independent States violated the U.S. Foreign Corrupt Practices Act of 1977, Cisco said.

The company, in the filing, said it takes the allegations "very seriously and is fully cooperating" with U.S. regulators. A company spokesman declined further comment on Thursday.

Cisco discussed the investigation in a Dec. 23 blog about business ethics posted on its website by Roxane Marenberg, a vice president in its compliance systems division.

Ms. Marenberg at the time said the company had found "no basis to believe that Cisco's activities are in violation of any law, and indeed the information we were provided does not allege wrongdoing by any of Cisco's executive management."

In the SEC filing, Cisco said it doesn't expect the investigation to have a "material adverse" impact on its finances, as the countries that are the focus of the bribery investigation make up less than 2% of its revenue.

In the latest quarter ended Jan. 25, Cisco's revenue dropped 7.8% to $11.2 billion. Profit dropped 55% to $1.43 billion, or 27 cents a share, from a year earlier, on a $655 million charge to cover the costs of addressing the memory-chip problem.

Write to Kathy Chu at kathy.chu@wsj.com and Don Clark at don.clark@wsj.com

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