Monitor Cisco Uptime

[Will Bashlor]

The thought in my mind for querying uptime via snmp had 2 purposes, 1.)
to (possibly) alert on no snmp response, and 2.) To display uptime in a
list format on Nagios for my network engineers/techs to view.

 

I like the idea of alerting on uptime < 1 day. But wouldn't the reply
need to be in a numbered time format only? I guess my mind is in Cacti
threshold plugin mode. For example:

 

If the snmp respond replies with 4579200 in seconds (53 days), and I
want to alert on uptime less than 1 day then my alert value would be
<86400, correct? If this is true how can this be done when the response
is:

 

"iso.3.6.1.2.1.1.3.0 = Timeticks: (447923619) 51 days, 20:13:56.19"

 

Or can I alert based on 447923619 only? It appears the 447923619 is
seconds with the last 2 digits being hundredths. Secondly, how can I
simply display "51 days, 20:13:56.19" In Nagios? I know these are basic
questions, I have a lot to learn and will continue to research every
day.

 

We have ssh only enabled for obvious security reasons, so that would
work as well for monitoring device vitals.

 

I'm still interested in what other Network Managers as myself are using,
services wise to monitor critical core equipment vitals other than ping,
if anyone else would like to share.

 

Today we are using an older version of whatsup with a little over 1000
devices/services (includes CPE) with ping only. I'm looking to Nagios as
a possible future replacement. Love it so far, just a bit of a learning
curve. NagiosQL helps me a lot with config files.

 

Thanks for the response.

 

-Will

 

From: Fernando Feijo [mailto:ffeijo at ffeijo.com] 
Sent: Saturday, October 20, 2012 12:19 PM
To: Nagios Users List
Subject: Re: [Nagios-users] Monitor Cisco Uptime

 

>>>What other services do you recommend monitoring for up/down status
besides ping?

You could also do ssh or even telnet, if you have them enabled.

 

You did not ask, but a comment on uptime. You can use it to detect
router bounces, detecting rogue reloads or perhaps system crashes. I
have it to go to critical whenever the uptime is below X minutes, and
email out. Network tests such as ping, snmp or ssh availability might
miss a quick box's trip down, but uptime will always catch a reload.

 

Fernando

 

**

On Oct 20, 2012, at 11:09 AM, Will Bashlor <wbashlor at atcnetworks.net>
wrote:





Hi list,

 

Well I'm not sure which of the steps below worked but it started working
in Nagios and the check_snmp command works from cli. I'd still be
interested in a guide or the correct steps I should have taken. I'm on a
test vm now but will be reinstalling on a production vm later.

 

root at atcdeb01:~# /usr/lib/nagios/plugins/check_snmp -H x.x.x.x -C public
-o sysUpTime.0

SNMP OK - Timeticks: (448261008) 51 days, 21:10:10.08 |

root at atcdeb01:~#

 

Now I've got to figure out a couple more things. Feel free to respond if
you can help.

 

1.)    Even though ping and uptime show ok, the test Cisco host status
went to "PENDING" in Nagios...?

2.)    Not sure how to get rid of part of the response I don't need for
uptime. I only need "51 days, 21:10:10.08" under Status Information in
Nagios

 

Another thing, I'm looking for advice. For monitoring up/down status'
for core Cisco routers/switches my idea is to monitor snmp response and
ping, but I don't want to get 2 alerts from 1 device if it were to go
down.

 

So can I get ping or snmp alerts if they go down individually and only
one alert if the device is down hard? What other services do you
recommend monitoring for up/down status besides ping?

 

Or is ping sufficient enough in your opinion? I may configure text
alerts only on ping and maybe just email alerts for snmp, or no alerts
for snmp. I like seeing uptime in Nagios though, it makes it easy to see
if any devices have just rebooted after an event.

 

I continue to research every day but I am interested in your thoughts
and opinions if you'd like to share.

 

Oh, can I integrate Nagios with my Cacti? Sorry for all the questions
but will be very grateful for any responses.

 

Thanks all very much,

 

-Will

 

From: Will Bashlor [mailto:wbashlor at atcnetworks.net
<http://atcnetworks.net> ] 
Sent: Saturday, October 20, 2012 11:23 AM
To: Nagios Users List
Subject: [Nagios-users] Monitor Cisco Uptime

 

Hi list,

 

I've searched to no avail, this is a basic question with hopefully a
simple answer.

 

I'm a long time cacti user (windows), I know basic Linux knowledge, new
to Nagios. I have a fresh install of Debian stable (squeeze) with
apt-get installed Webmin, ssh, apache2, and Nagios 3.2.1, nagiosql, and
whatever dependencies. I am trying to setup monitoring of our core Cisco
routers and switches. I have configured 2 services, ping and uptime.
Ping works great of course but I can't get a valid response from
check_snmp for uptime. Here's the command I've tried from the command
line:

 

root at atcdeb01:/# /usr/lib/nagios/plugins/check_snmp -H x.x.x.x -C public
-o sysUpTime.0

no output, it just hangs

 

I've also tried

 

root at atcdeb01:/# /usr/bin/snmpget -v2c -c public x.x.x.x sysUpTime.0

sysUpTime.0: Unknown Object Identifier (Sub-id not found: (top) ->
sysUpTime)

 

Obviously with the correct IP and community string

 

If I try this I get:

 

root at atcdeb01:/# /usr/bin/snmpget -v2c -c public x.x.x.x
1.3.6.1.2.1.1.3.0

iso.3.6.1.2.1.1.3.0 = Timeticks: (447923619) 51 days, 20:13:56.19

 

So using OID names aren't working. I've researched with not much luck.

 

>From here and various other sites I've tried...

http://wiki.debian.org/SNMP <http://wiki.debian.org/SNMP> 

 

Added "deb http://ftp.us.debian.org/debian
<http://ftp.us.debian.org/debian>  squeeze main contrib non-free" to
/etc/apt/sources.list

 

apt-get update

 

Then apt-get install snmp-mibs-downloader
 
Then "download-mibs". Restart snmp.
 
All to no avail. What am I doing wrong? Is there a simple guide I can
use so check_snmp works with oid names for Cisco and other devices?
 
Thanks for any help you can provide.
 

Best Regards,

 

-Will

 

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