原理：在智象智能运维平台系统配置安装过程中，利用snmp协议在交换机上设置trap陷阱，当端口状态发生改变时，通知监控主机，监控主机配置snmptrapd进行接收，然后告警给用户。
一、智象运维中交换机配置部分（需要查看具体产品文档，这里以华为S9306为例）：
display snmp-agent trap feature-name ifnet all ------------------------------------------------------------------------------ Feature name: IFNET Trap number : 17 ------------------------------------------------------------------------------ Trap name Default switch status Current switch status hwIfFlowDown off off hwIfFlowUp off off hwIfNameChange off off hwIfNameChangeResume off off hwIfMonitorInputRateRising off off hwIfMonitorInputRateResume off off hwIfMonitorOutputRateRising off off hwIfMonitorOutputRateResume off off hwEntityExtCfmOverSlot off off hwEntityExtCfmOverCard off off linkDown off off linkUp off off hwIfControlFlapSuppress off off hwIfControlFlapResume off off hwExtInterfaceDelete off off hwIfMonitorCrcErrorRising off off hwIfMonitorCrcErrorResume off off ------------------------------------------------------------------------------ snmp-agent trap enable feature-name ifnet trap-name linkdown snmp-agent trap enable feature-name ifnet trap-name linkup snmp-agent target-host trap address udp-domain 192.168.1.172 source Vlanif 4001 params securityname public v2c dis snmp-agent target-host Target-host NO. 1 ----------------------------------------------------------- IP-address : 192.168.1.172（trap服务器地址） Source interface : Vlanif4001 VPN instance : - Security name : %@%@Wkz7H#,G'@JZvn-ayZ"Nf2')%@%@ Port : 162 Type : trap Version : v2c Level : No authentication and privacy NMS type : NMS With ext-vb : No -----------------------------------------------------------
二、trap服务器配置：
1、安装snmptrapd，根据系统类型安装并配置：
Ubuntu: apt-get install snmptrapd -y CentOS: yum install -y net-snmp net-snmp-utils net-snmp-perl
2、配置snmpd：
cat /etc/snmp/snmptrapd.conf # Example configuration file for snmptrapd # # No traps are handled by default, you must edit this file! # # authCommunity log,execute,net public # traphandle SNMPv2-MIB::coldStart /usr/bin/bin/my_great_script cold authCommunity log,execute,net public traphandle IF-MIB::linkDown /monitor/notification.sh traphandle IF-MIB::linkUp /monitor/notification.sh
三、编写脚本：
1、告警脚本：
[root@monitor monitor]# cat notification.sh
#!/bin/sh
read blank
read ip
switch_ip=`/bin/echo $ip | /bin/awk -F '[' '{print $2}' | /bin/awk -F ']' '{print $1}'`
while read oid val
do
if [ "$oid" = "SNMPv2-MIB::snmpTrapOID.0" ];then
if_status=`/bin/echo $val | /bin/awk -F"link" '{print $2}'`
fi
if /bin/echo $oid | /bin/grep ifDescr;then
if_name=`/bin/echo $val`
fi
done
if [ $if_status = "Up" ];then
msg=`/bin/echo "OK! Switch($switch_ip) -- $if_name -- $if_status"`
else
msg=`/bin/echo "Critical! Switch($switch_ip) -- $if_name -- $if_status"`
fi
/monitor/sendwx.sh "$msg"
2、编写sendwx.sh告警通知脚本，根据实际情况自行编写，这里暂不作示例。
