查看配置的方法：
华为/H3C dis curr
思科/锐捷 show run
配置snmp的方法：
snmp-agent communisty read public
snmp-agent sys-info version all
H3C/HUAWEI
info-center enable
info-center loghost 192.168.0.1
info-center source default channel 2 log level warning
Cisco
logging on
logging 192.168.0.1
logging trap warning