check a lacp link state, if one of the link is down, the script will generate alarm.

check_lacp

#!/bin/bash
OK=0
CRITICAL=2
STATE=0
PLUGIN_PATH="/usr/local/nagios/libexec/plugins"
outputfile=/var/log/bgp.log
OID_sysDescr=SNMPv2-MIB::sysDescr.0
OID_lag=1.2.840.10006.300.43.1.1.1
COMMUNITY=bimat
VERSION="1.0"
print_version() {
  echo "$SCRIPTNAME" version "$VERSION"
  echo "This nagios plugins comes with ABSOLUTELY NO WARRANTY."
  echo "You may redistribute copies of the plugins under the terms of the GNU Gen                                                                                       eral Public License v2."
  echo "Author: hafthanhf"
  echo "Hanoi - 2014"
}

print_help() {
  print_version
  echo ""
  echo "**** Check the status of LACP link  ****"
  echo -e "This script opertates based on checking the speed of a LACP port, \nif                                                                                        one of its link goes down, the speed will decrease respectively.\nBased on that                                                                                        the Script gives the alarm exactly"
  echo ""
  echo -e "-H ADDRESS      - Hostname to query (default: 127.0.0.1)\n -p Port nam                                                                                       e \n -n number of link in a LACP bundle \n -V Print version"
  echo  "-h Print this help **** have fun"
  echo "EXP: this command use to check a lacp link on Junos device, with 2 physical links:"
  echo "./check_lacp -H 10.10.10.10 -p ae2 -n 2"
}
# Arguments
while getopts H:p:n:hV OPT
do
  case "$OPT" in
    H) HOSTNAME="$OPTARG" ;;
    p) portname="$OPTARG";;
    n) amount="$OPTARG";;
    h) print_help
       exit $STATE ;;
    V) print_version
       exit $STATE ;;
   esac
done
############################
######---Main----###########
############################

#Get system infomation
sysinfo=`snmpwalk -v 2c -c $COMMUNITY $HOSTNAME $OID_sysDescr | awk 'NR==1 {print                                                                                        $4}'`
if [ "$amount" -gt "4" ]; then
echo "Cannot check, too many link"
exit 3
fi
#SPEED=`expr $amount \* 1000000000`
case "$sysinfo" in
        Cisco) lacp="Port-channel" ;;
        Juniper) lacp="ae" ;;
esac
#echo $lacp
#echo $sysinfo
portid=`snmpwalk -v 2c -c $COMMUNITY $HOSTNAME IF-MIB::ifDescr | grep -w "\ $port                                                                                       name$" | awk -F '[{. }]'  '{print $2}'`
#echo $portid
portalias=`snmpwalk -v 2c -c $COMMUNITY $HOSTNAME IF-MIB::ifAlias | grep "$portid                                                                                       " `
#echo $portalias
#echo "List Port-channel:"
#snmpwalk -v 2c -c $COMMUNITY $HOSTNAME IF-MIB::ifDescr | grep $lacp | awk '{prin                                                                                       t $4}'
speed=`snmpwalk -v 2c -c $COMMUNITY $HOSTNAME IF-MIB::ifSpeed.$portid | awk '{pri                                                                                       nt $4}'`
if [ "$speed" -lt 999999999 ]; then
baseband=100000000
else
baseband=1000000000
fi
refnum=`expr $speed / $baseband`
SPEED=`expr $speed / 1000000`
echo "Interface Speed: $SPEED Mbps"
if [ "$refnum" -lt "$amount" ]; then
        echo "One of the link is down, plz check this link "
        exit 2
        else echo "link OK"
        exit 0
fi
#################  INFO   ############
###########################################