Nagios-plugin-check_snmp_cisco_traffic is a project mainly written in PERL and PHP, it's free.
Nagios plugin to check traffic on Cisco switches with performance data (Centreon graphing)
Check Traffic Usage of an Interface on a Cisco Device Check Traffic Usage of an Interface on a Cisco Device
This is a bit tricky, because cisco's snmp counter are independent from the cli output. The snmp counters can't be reset at runtime, they online reset themself at reboot. So in addition to the snmp values we get, we need to calculate....
We save the last check results/sums in a text file so make sure you set "tmpfile" below. Please create it, fill in 4 zeros and make sure it is writable by the user that nagios runs as
$ touch /home/nagios/check_snmp_cisco_traffic.txt $ echo 0 0 0 0> /home/nagios/check_snmp_cisco_traffic.txt $ chown nagios:nagios /home/nagios/check_snmp_cisco_traffic.txt
This plugin currently only uses HC/64bit counter, because 32bit begin from zero too often. You also have to find out the interface number yourself, i don't, yet, want the script to search for it every runtime. Just snmpwalk your device like this:
$ snmpwalk -v2c -c community-string HOST 1.3.6.1.2.1.31.1.1.1.1 IF-MIB::ifName.1 = STRING: Fa0 This -^- is the interface-number
Version 0.1, Copyright (c) 2008 by Michael Boehm
TODO: -testing -maybe accepting Interface descriptions as argument -maybe include check for 32bit counter