nagios to monitor several switch ports

[Kevin Manuel]

We have Nortel switches. Just to complicate things further, I am using RMON snmp traps to alert Nagios when an event occurs on one of the switches (i.e. broadcast packets exceed a certain threshold). 

A summary of my setup:

- when a certain threshold is exceeded, the port will trigger an alarm and send an snmp trap to our management server 

- snmptrapd (a net-snmp daemon) is running on the management server and receives the trap and passes it to my Perl "trap-handler" script

- the "trap-handler" script translates the snmp trap and updates Nagios according (through a passive check)

The problem is, for example, say 3 ports go down on a single switch and only one comes back up, this "clears" the service alert in Nagios even though 2 ports are still down. One was around this would be to have a service for each port but as I mentioned previously, I'm hoping to figure out another way to do it.

(I hope I explained that well enough but I'm sure I lost a lot of you ....)


-----Original Message-----
From: Christian Schneemann [mailto:cschneemann at suse.de] 
Sent: April-08-08 4:14 PM
To: nagios-users at lists.sourceforge.net; kmanuel at unb.ca
Subject: Re: [Nagios-users] nagios to monitor several switch ports

Am Dienstag 08 April 2008 schrieb Kevin Manuel:
> I would like to have Nagios alert on the status of individual switch ports
> - link up/down, traffic, etc. Is there a way to do this other than creating
> a separate host or service for each port. There are 1000's of ports on our
> network and this doesn't seem practical.
What kind of switches do you have?
I don't know if there is a plugin for such a test, but I think it can easily 
be written using SNMP and a scriptinglanguage of your choice.


>
>
>
> What I would like is for a host switch to show as "warning" (or "critical")
> if one or more switch port is down / exceeding a traffic limit and showing
> "ok" only if ALL ports are up, etc.
Even if I don't understand why you want to monitor that, SNMP is your friend 
here. You just need the according MIB according to your switch.

Greetings,
-- 
Christian Schneemann
-------------------------------------
SUSE LINUX Products GmbH,
Maxfeldstr. 5, D - 90409 Nürnberg

Phone:  +49 (0)911 - 740 53 0
e-mail: cschneemann at suse.de
-------------------------------------
SUSE LINUX Products GmbH, GF: Markus Rex
HRB 16746 (AG Nürnberg)


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