There is no way for this to happen in the way you describe it.
Why would something vanish randomly one discovery run and then never be readded? Do things ever get readded? Do they always get readded on the next discovery run?
adam.
On 2014-04-02 03:07, Bastiaan Topper wrote:
Hi Adam,
I didn't change anything on the device. It is only for a few devices, but always the same ones. When I do a manual discovery, it works fine, when I start a polling the devices reports down or removes the discovery items again. I check IOS version, which isn't the same on al devices, but I will try to upgrade one of the failed devices, to check if this might be an IOS bug. Thing I noted is that a manual discovery always succeeds, but after a while (mostly hours) the attributes are being removed again (probably the daily discovery cron or after multiple polling runs).
I will try the IOS upgrade first.
Thanks and regards, Bastiaan Topper
-----Original Message----- From: Adam Armstrong [mailto:adama@memetic.org] Sent: dinsdag 1 april 2014 23:17 To: Observium Network Observation System Subject: Re: [Observium] strange discovery behaviour
The only reason these things would be removed is if they are not contained within the output returned from the snmpwalk command.
There are many reasons why your devices might fail to return the correct output. There is no possibility of things slowly disappearing over time and not returning themselves. What you're seeing is just that on occasion the snmpwalk fails half way through and half of the things it was walking get removed, as they're no longer contained in the output.
This is usually down to poor network connectivity, but it can be related to firewalls or the SNMP implementation on the device, though Cisco kit tends to have quite good SNMP implementations.
Have you set any unusual settings or changed anything?
adam.
On 2014-04-01 03:06, Bastiaan Topper wrote: Hi,
We have a few Cisco routers monitored by Observium which lose their attributes over time. When I do a manual discovery the memory/processor/ip address and BGP peers are correctly added. But over time (between minutes and hours, as you can see below) the information is removed.
Then information about BGP or processor/memory disappear. After a manual discovery of the device they are added back, but again after a while they disappear.
Is this some kind of bug? Do you need any debug information from me, please let me know!?
Thanks.
Met vriendelijke groet,
BASTIAAN TOPPER
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