In the current market session, Cisco Systems Inc. (NASDAQ:CSCO) share price is at $50.46, after a 0.41% decrease. Over the past month, the stock increased by 2.33%, but over the past year, it actually decreased by 7.41%. With good short-term performance like this, and questionable long-term performance, long-term shareholders might want to start looking into the company's price-to-earnings ratio.A Look at Cisco Systems P/E Relative to Its CompetitorsThe P/E ratio measures the current share price to the company's EPS. It is used by long-term investors to analyze the company's current