Out Discards

Greetings,
I am trying to identify what is causing a huge number of OUT Discard (err) messages on my switches. I see these when I run “sh int counters errors”. I have 11 VLAN’s running on the network, and these errors occur in ports that I have trunked with no ACL. Almost all my ports are either access or trunks with ACL, but a few of them are trunks (dot1q). On the interfaces where I restrict VLAN or on the ports with just access enabled, I do not see these errors.

Is there a tool I can use to identify what is generating all these packets and or what VLAN they are coming from? If I can identify the culprit, I can identify the VLAN. I know I can use Wireshark to read what’s on the wire, but I’m not sure how use Wireshark to identify the VLAN and or the IP address(s) creating this “noise”.
Thanks
Robert AdvancedideaAsked:
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Rick_O_ShayConnect With a Mentor Commented:
Out discards are usually due to the switch not being able to transmit because of a lack of buffers or because QOS is being applied to packets or something like that.
Unless the switch port stats show more granularity than that you'll have a hard time determining the cause.
Check for high utilization etc. coming into a port which may be driving things faster than the TX side can handle.
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