第二条rate-limit的作用是什么？ 
正确答案:
input flow does not match the acl 1，will use the second rate-limit command， which average rate is 48kbps，normal burst size is 8000byte.Traffic comforms the rate（ less than 48kbps） is marked with IP precedence 4， and traffic exceed the rate is marked with an IP precedence of 5.
答案解析:有
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