该问题是因为客户修改了log记录级别，一般telnet是0级
命令配置如下：
Ruijie(config)#logging monitor ?
<0-7> Logging severity level
alerts Immediate action needed (severity=1)
critical Critical conditions (severity=2)
debugging Debugging messages (severity=7)
emergencies System is unusable (severity=0)
errors Error conditions (severity=3)
informational Informational messages (severity=6)
notifications Normal but significant conditions (severity=5)
warnings Warning conditions (severity=4)
<cr>
telnet的日志必须是0 才可以记录
发布时间：2013-12-04
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