VLAN mismatch (check VLAN stats on both sides also)? L2 mismatch (Speed/Duplex) ? ACLs? QoS ?.Utilization on other end ? L2 stats ( dropped, Tx, Rx etc.).Average ? pattern (every x number of hours ?) Since when? Only during Peak or constant regardless of load ? what time frame is the discards for ?.Traffic Load ? CPU Load ? show logs ? Other L2 Errors ? Layer3 IP routing or ACL drops/discards as opposed to interface packet drops/discards (switch interfaces).What ports ? internal or external ? What device on the other end ?. What Switches/Models? What firmware versions? Look at the subsequent firmwares’ release notes for any identified issues, resolved caveats etc.They have been of help to me in the past on more than one occasion. The following list of questions/vectors can assist in troubleshooting Layer 2 discard issues.
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