华为、H3C:

#snmp-agent

#snmp-agent community read public
#snmp-agent sys-info version all


思科:

cisco(config)#snmp-server community public ro   #设置snmp可读字#段为 public

cisco(config)#snmp-server enable traps


HP:

snmp-server community "public" Unrestricted 

snmp-server host 192.168.*.* "Cacti" All