A perl script to convert Cisco IOS/Nexus/ASA configurations to HTML for easier comprehension

Lee ler762 at gmail.com
Tue Oct 11 13:48:17 UTC 2016

On 10/10/16, Jay Hennigan <jay at west.net> wrote:
> On 10/6/16 1:26 PM, Jesse McGraw wrote:
>> Nanog,
>>     (This is me scratching an itch of my own and hoping that sharing it
>> might be useful to others on this list.  Apologies if it isn't)
>>   When I'm trying to comprehend a new or complicated Cisco router,
>> switch or firewall configuration an old pet-peeve of mine is how
>> needlessly difficult it is to follow deeply nested logic in route-maps,
>> ACLs, QoS policy-maps etc etc
>> To make this a bit simpler I’ve been working on a perl script to convert
>> these text-based configuration files into HTML with links between the
>> different elements (e.g. To an access-list from the interface where it’s
>> applied, from policy-maps to class-maps etc), hopefully making it easier
>> to to follow the chain of logic via clicking links and using the forward
>> and back buttons in your browser to go back and forth between command
>> and referenced list.
> Way cool. Now to hook it into RANCID....

It looks like what I did in 2.3.8 should still work - control_rancid
puts the diff output into $TMP.diff so add this bit:
grep "^Index: " $TMP.diff | awk '/^Index: configs/{
 if ( ! got1 ) { printf("/usr/local/bin/myscript.sh "); got1=1; }
 printf("%s ", $2)
 END{ printf("\n") }
' >$TMP.doit
/bin/sh $TMP.doit >$TMP.out
if [ -s $TMP.out ] ; then
   .. send mail / whatever
rm $TMP.doit $TMP.out


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