(Reuters) -Cisco Systems Inc gave a positive forecast for first-quarter sales as a COVID-19 recovery in China eases supply chain shortages and helps it meet demand for networking hardware, sending the company’s shares 5% higher in extended trading.The results announced on Wednesday suggest networking equipment makers have started overcoming the component crunch that had kept them from tapping a post-pandemic revival in digital infrastructure spending.”After a challenging April due to the COVID-related shutdowns in Shanghai … overall supply constraints began to ease slightly at the back half of the fourth quarter and continuing into the start of Q1,” Chief Executive Chuck Robbins said on a post-earnings call.The networking major expects current-quarter revenue to rise between 2% and 4%, while analysts predicted it would remain flat, according to Refinitiv IBES data. Annual revenue is forecast to jump 4% to 6%.”The guide was good enough because they start lapping stronger year-ago numbers. So the guide for the year and quarter are seen as a sign of confidence by the company,” Elazar Advisors analyst Chaim Siegel said.Still, rising costs are a cause of concern for the maker of routers, switches and communication tools as it spends more on freight and logistics to ensure a steady supply of components.After a drop in gross margins in the April-June quarter to 61.3% from 63.6%, CEO Robbins said higher costs would continue in the short term.That was reflected in its first-quarter adjusted profit forecast of 82 to 84 cents, whose midpoint was below estimates of 84 cents. Fourth-quarter adjusted profit was 83 cents per share, one cent above estimates. Revenue came in at $13.1 billion, beating expectations of $12.73 billion. More