[CentOS] One for the Cisco experts...

Les Mikesell lesmikesell at gmail.com
Thu Apr 23 04:18:37 UTC 2009

Craig White wrote:
> Thus far (and admittedly this is premature), I find Zenoss a lot beefier
> but I spent a ton of time setting it up the first time until I figured
> things out whereas I spent comparatively no time setting OpenNMS up. But
> I have learned things along the way, especially getting SNMP set up on
> everything I could.

Basically, Opennms will auto-discover the ranges you give it, detecting 
an assortment of services and snmp, then automatically poll what it 
discovers on 5 minute intervals and report outages.  You can configure 
thresholds levels in the snmp data to generate alarms.  You have to add 
whatever setup you want for external notificatons - they are off by 
default but you can set up email destinations, a jabber group 
conference, etc.  There are near-infinite other options, of course, but 
that covers most of what you are likely to want.

I found this pdf with a much nicer overview:

> This is a Dell PowerConnect 6248 'managed' switch so I would think it
> could. I enabled monitoring on all of the ports just in case.

I wouldn't be too hopeful without some extra work.  I have a pair of 
Dell 5324's and am not getting the link info, but it works on a bunch of 
different cisco models.  It does collect the bandwidth data from the 
Dells - the rest might be a matter of adding more of the oid trees to 
the 'included' view but the Dell switch management is kind of weird.

Per http://www.opennms.org/index.php/Linkd you need the 
.iso.org.dod.internet.mgmt.mib-2.ip.ipNetToMediaTable values.

> One thing that is throwing me for a loop is that it says all the
> Macintosh systems are a 10Mbps SNMP connection but on the Macs
> themselves, they clearly indicate 1Gbps. This somewhat tracks all of the
> pain that I have had with SNMP collection on the Macs, which on Zenoss
> has been less than spectacular.

I hadn't tried a Mac before - the default settings don't look that 
promising.  It should all boil down to getting the oid trees you need 
exposed, though.

 > For example, I get installed software
> list, total installed memory, total hard drive space, free hard drive
> space on all Linux and Windows systems but only get total hard drive
> space and total installed memory on Macs. On Zenoss, I have resorted to
> ssh collection on Macs because snmp collection just sort of sucks.

Might be a good topic for the opennms list.

   Les Mikesell
    lesmikesell at gmail.com

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