With the rapid development of IP technology, the data flow of metropolitan area network increased rapidly. How to improve the reliability of BRAS equipment has become the key issues for attention. Based on the real-time standby technique of BRAS, the networking schemes and the result of present network test, it gives several recommended solution on the real-time standby of BRAS, to promote reliability of the metropolitan area network, and ensure the safe loading of al kinds of business on the BRAS.% 随着IP技术的飞速发展及城域数据网业务量的剧增，如何提高BRAS的可靠性，已成为重点关注问题。根据BRAS热备技术原理、组网方案研究及现网测试结果，给出了目前BRAS热备推荐方案，保障了各类业务在BRAS上的安全承载，提升了城域数据网的可靠性。
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