In order to know if a port is down you need to use snmptrap, for this you need to do the installation explained on the wiki:
We are going to use the next script. The script work by:
• Searching the name and id of the host in the data base using the ip.
• Using the id, search for the description of the item, in wich the latest value is the port down.
• Building the name of a key that will add the trap as follows key = “<item_with_last_value_as_port>_linkDown”
• If it doesn’t find the ip, it will add the snmptrap to the default host named snmptraps.
• If it finds the ip, but doesn’t find the item, it will save the trap on the default host named snmptraps.
Once you do all that, you need to create the follow items on the Template SNMPv2:
Default key to snmptraps:
Key to check if a port is down (you need to create this for every ifDescr):
Trigger of the link down:
Code:
http://www.zabbix.com/wiki/howto/monitor/snmp/snmptraps
• Searching the name and id of the host in the data base using the ip.
• Using the id, search for the description of the item, in wich the latest value is the port down.
• Building the name of a key that will add the trap as follows key = “<item_with_last_value_as_port>_linkDown”
• If it doesn’t find the ip, it will add the snmptrap to the default host named snmptraps.
• If it finds the ip, but doesn’t find the item, it will save the trap on the default host named snmptraps.
Code:
#!/bin/bash
#
ZABBIX_SERVER="localhost";
ZABBIX_PORT="10051";
ZABBIX_SENDER="/usr/local/bin/zabbix_sender";
KEY2="_"
KEY3="linkDown"
KEY="snmptraps";
HOST="snmptraps";
# END OF CONFIGURATION
read hostname
read ip
read uptime
read oid
read address
read community
read enterprise
address=`echo $address|cut -f2 -d' '`
enterprise=`echo $enterprise|cut -f2 -d' '`
oid=`echo $oid|cut -f11 -d'.'`
community=`echo $community|cut -f2 -d'"'`
$zabbixuser=”MyUser”
$zabbixpass=”MyPass”
ZABBIXHOSTID=$(echo "select hostid, host from zabbix.hosts where ip=\"$hostname\" order by 'hostid' limit 1;" | mysql -N -u $zabbixuser –p$zabbixpass zabbix)
ZABBIXID=$(echo $ZABBIXHOSTID | cut -d" " -f1)
ZABBIXHOST=$(echo $ZABBIXHOSTID | cut -d" " -f2-)
[[ "$ZABBIXHOST" ]] && {
TRAPOID=$(echo $oid | cut -d: -f3)
ZABBIXITEM=$(echo "select description from zabbix.items where hostid=\"$ZABBIXID\" AND lastvalue=\"$community\" order by 'hostid' limit 1;" | mysql -N -u $zabbixuser –p$zabbixpass zabbix)
if [ "$ZABBIXITEM" ]; then
KEY="$ZABBIXITEM$KEY2$KEY3"
HOST=$ZABBIXHOST
fi
ZABBIXITEM=$(echo "select key_ from zabbix.items where key_=\"$TRAPOID\" and hostid=\"$ZABBIXID\";" | mysql -N -u $zabbixuser –p$zabbixpass zabbix)
if [ "$ZABBIXITEM" ]; then
KEY=$ZABBIXITEM
fi
HOST=$ZABBIXHOST
}
str="$hostname $address $community $enterprise $oid"
$ZABBIX_SENDER -z $ZABBIX_SERVER -p $ZABBIX_PORT -s $HOST -k $KEY -o "$str"
Default key to snmptraps:
Key to check if a port is down (you need to create this for every ifDescr):
Trigger of the link down: