Cisco IOS Cookbook, 2nd Edition

Extracting Hardware Inventory Information

Problem

You need an up-to-date list of the hardware configurations and IOS levels of all of your routers.

Solution

The Bourne Shell script in Example 1-3 uses SNMP to extract useful version information from a list of routers. By default, the script will store this data in CSV format so you can easily import it into a spreadsheet for analysis. No arguments are required or expected.

Example 1-3. inventory.sh

#!/bin/sh
#
#    inventory.sh -- a script to extract valuable information
#                    from a list of routers. (Name, Type, IOS version)       
#
#
# Set behaviour
public="ORARO"
workingdir="/home/cisco"
#
LOG=$workingdir/RESULT.csv
infile=$workingdir/RTR_LIST
snmp="/usr/local/bin/snmpget -v1 -c $public"
#
while read device
do
  $snmp $device sysName.0 > /dev/null
  if [ "$?" = "0" ] ; then
    rtr=\Q$snmp $device .1.3.6.1.4.1.9.2.1.3.0 | cut -f2 -d\" \Q
    type2=\Q$snmp $device .1.3.6.1.4.1.9.9.25.1.1.1.2.3 | cut -f2 -d$ \Q
    ios=\Q$snmp $device .1.3.6.1.4.1.9.9.25.1.1.1.2.5 | cut -f2 -d$ \Q
    prot=\Q$snmp $device .1.3.6.1.4.1.9.9.25.1.1.1.2.4 | cut -f2 -d$ \Q
    echo "$device, $rtr, $type2, $ios, $prot" >> $LOG                 
  fi
done < $infile

Discussion

The inventory.sh script extracts hardware and IOS version information directly from the routers using SNMP. This ensures that the data is up to date. You can even automate this script so it runs periodically to make sure that your inventory information is always accurate. In a large network, this is much easier than keeping track of this information ...