Command execution on Cisco routers

[Stanley Hopcroft]

Dear Sir,

I am writing to thank you for your letter and say,

On Thu, Sep 30, 2004 at 08:09:45PM -0700, nagios-users-request at lists.sourceforge.net wrote:
> 
> Message: 7
> Date: Thu, 30 Sep 2004 22:10:58 +0200
> From: Horvath Tamas <zsitfa at axelero.hu>
> To: nagusers <nagios-users at lists.sourceforge.net>
> Subject: [Nagios-users] Command execution on Cisco routers
> 
> Hi members!
> 
> I would like to run some commands on Cisco routers via Nagios. I'm going 
> to write a simple shell script as a Nagios plug-in, but I've didn't 
> managed to handle Telnet interactive behavior (give it automatically the 
> username and password) yet.
> 
> I need this method, because I don't do what I want via SNMP. I can use 
> Telnet, because I access our routers via IPSec VPN, but I can use SSH as 
> well, if someone know a working solution for SSH.
> 
> Did someone managed to do this?
>

I am using Expect/TCL in a Nag plugin to do this (check that a 
backup link is up by using the router CLI to ping the other end of an 
ISDN circuit).

However, done again I would use Perl with either of the CPAN modules

Net::Telnet::Cisco
Net::Telnet
Expect

This is because Perl is easier to use than Expect/TCL for this 
application and the plugins more reliable (much easier to eliminate 
errors that should be trapped at compile time).

Net::Telnet::Cisco is particuarly nice to use.

OTOH, if want to have Nag periodically download configs, use RANCID + 
cron.

(The problem with ssh is that not all Ciscos support it. If you have ssh 
on your router, then all of these approaches can be used for ssh).

> Any help would be appreciate!
> 
> Thanks, Tamas!

Yours sincerely.

-- 
Stanley Hopcroft

Network specialist, IT Infrastructure
IP Australia
Ph: (02) 6283 3189  Fax: (02) 6281 1353
PO Box 200 Woden  ACT 2606
http://www.ipaustralia.gov.au


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