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Out Discards

Posted on 2013-02-05
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Last Modified: 2013-02-09
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
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Question by:erocon
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Rick_O_Shay earned 500 total points
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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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