Cisco IOS Cookbook, 2nd Edition

Using SNMP to Perform Mass Configuration Changes

Problem

You want to automate the distribution of a set of configuration commands to a large number of routers.

Solution

The following Perl script will distribute configuration commands to a large number of routers. It works by using SNMP to trigger TFTP file transfers into the routers. In effect, this script lets you automatically distribute a series configuration commands to a list of routers. Automating routine changes like this saves time and effort, but more importantly, it virtually eliminates typographical mistakes.

Here’s some example output:

Freebsd% ./snmpcfg.pl
=================================== 
toronto - Update Successful
toronto - Wr Mem Successful
=================================== 
boston  - Update Successful
boston  - Wr Mem Successful
=================================== 
denver  - Update Successful
denver  - Wr Mem Successful
=================================== 
newyork - Update Successful
newyork - Wr Mem Successful
=================================== 
detroit - Update Failed
=================================== 
chicago - Update Successful
chicago - Wr Mem Successful
=================================== 
sanfran - Update Successful
sanfran - Wr Mem Successful
=================================== 
seattle - Update Successful
seattle - Wr Mem Successful
===================================
Freebsd%

The Perl code follows in Example 17-3.

Example 17-3. snmpcfg.pl

#!/usr/bin/perl -w # # snmpcfg.pl -- a script to perform mass configuration ...