03-04-2009 12:00 PM
Recently I noticed rather randomly that some of the switches in my network are experiencing a large amount of dropped packets on a trunk interface (a couple thousand per minute approx).
I have email alerts enabled for any link up/down issues, and usually I get email alerts for high broadcasts, and at one point, high discard rates.
Any ideas on why I wasn't receiving any alerts for the large discard rate I was experiencing?
Also of note; for some reason 124 out of 133 devices are in a 'Pending' state for device management status. Could this be a reason for not receiving specific alerts? I'm not sure how I can get those devices back to 'normal' status.
Any information would be appreciated. Thanks for your time.
Solved! Go to Solution.
03-09-2009 09:47 AM
No. The device type has no bearing on Notification Services. Just make sure that those devices are included in your Notification Group under DFM > Notification Services > Notification Groups.
03-04-2009 12:09 PM
It sounds like you're mixing applications. The HighDiscard event comes from DFM. What version of DFM are you using? When the problem is occurring, do you see a HighDiscardRate event in the DFM Alerts and Activities Display? If you go to DFM > Device Management > Discovery Status, what is the status of these switches? If you go to DFM > Device Management > Device Details, and view the device details for these switches, are the ports that are experiencing the problem managed by DFM?
03-04-2009 02:24 PM
Thanks for the fast reply.
My DFM is currently on version 2.0.8
Everything looks fine for the other two areas you suggest looking; Discovery Status is 'Known/Active' and the ports are flagged for 'True' under Device Details.
Is there some way to set a threshold for when the HighDiscardRate alert is triggered?
03-04-2009 03:15 PM
This can be done under DFM > Configuration > Polling and Thresholds > Managing Thresholds. You will want to adjust the thresholds under DFM > System Defined Groups > Trunk Ports.
03-05-2009 07:03 AM
When I try to bring up the thresholds under DFM > System Defined Groups > Trunk Ports, I get an error message stating "No settings are available for this group/role. Please select another group/role."
03-05-2009 10:29 AM
Can you post a screenshot of this along with the output of the pdshow command?
03-09-2009 06:59 AM
03-09-2009 09:27 AM
Ah, this is not a problem. You're not drilling down far enough. You need to expand the Trunk Port subtree, and select a specific type of trunk port.
03-09-2009 09:45 AM
Alright, thanks, I got it.
The threshold for discarded packets was set at 5%. Given the rate of discarded packets, I believe that threshold would have been crossed.
Is it possible that the cause of the missing alerts is that the switches in question are 3524/3548 models?
03-09-2009 09:47 AM
No. The device type has no bearing on Notification Services. Just make sure that those devices are included in your Notification Group under DFM > Notification Services > Notification Groups.
03-17-2009 12:20 PM
Thanks for the help!
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