Outbound Discards

I have 2920-24G (J9726A) that is reporting Outbound Discards on it's uplink port (#2) to our core switch, a 2910al-48G (J9148A).

The 2920-24G is used for storage, and our three ESXi boxes are connected to it as well. The NAS is connected with two 10G, while the ESXi boxes have only 1G connections.

We do have a Veeam VM with a NIC on the storage network and it does a backup copy job to a machine offsite on a different subnet.

I ran this a few seconds apart:

2920-24G# show interface 2 Status and Counters - Port Counters for port 2 Name : Core: 2910al-48G [1Gbps] MAC Address : d4c9ef-bbf13e Link Status : Up Port Enabled : Yes Totals (Since boot or last clear) : Bytes Rx : 386,799,269 Bytes Tx : 3,096,011,716 Unicast Rx : 2,951,957,285 Unicast Tx : 3,249,931,476 Bcast/Mcast Rx : 141,823,075 Bcast/Mcast Tx : 3,492,270 Errors (Since boot or last clear) : FCS Rx : 0 Drops Tx : 39,625,576 Alignment Rx : 0 Collisions Tx : 0 Runts Rx : 0 Late Colln Tx : 0 Giants Rx : 0 Excessive Colln : 0 Total Rx Errors : 0 Deferred Tx : 0 Others (Since boot or last clear) : Discard Rx : 0 Out Queue Len : 0 Unknown Protos : 0 Rates (5 minute weighted average) : Total Rx (bps) : 51,379,816 Total Tx (bps) : 39,966,440 Unicast Rx (Pkts/sec) : 1,375 Unicast Tx (Pkts/sec) : 1,213 B/Mcast Rx (Pkts/sec) : 14 B/Mcast Tx (Pkts/sec) : 0 Utilization Rx : 05.13 % Utilization Tx : 03.99 % 2920-24G# show interface 2 Status and Counters - Port Counters for port 2 Name : Core: 2910al-48G [1Gbps] MAC Address : d4c9ef-bbf13e Link Status : Up Port Enabled : Yes Totals (Since boot or last clear) : Bytes Rx : 737,207,313 Bytes Tx : 3,536,445,140 Unicast Rx : 2,952,049,801 Unicast Tx : 3,250,023,646 Bcast/Mcast Rx : 141,824,075 Bcast/Mcast Tx : 3,492,300 Errors (Since boot or last clear) : FCS Rx : 0 Drops Tx : 39,626,479 Alignment Rx : 0 Collisions Tx : 0 Runts Rx : 0 Late Colln Tx : 0 Giants Rx : 0 Excessive Colln : 0 Total Rx Errors : 0 Deferred Tx : 0 Others (Since boot or last clear) : Discard Rx : 0 Out Queue Len : 0 Unknown Protos : 0 Rates (5 minute weighted average) : Total Rx (bps) : 48,984,592 Total Tx (bps) : 41,587,720 Unicast Rx (Pkts/sec) : 1,354 Unicast Tx (Pkts/sec) : 1,223 B/Mcast Rx (Pkts/sec) : 12 B/Mcast Tx (Pkts/sec) : 0 Utilization Rx : 04.89 % Utilization Tx : 04.15 % 2920-24G# show interface 2 Status and Counters - Port Counters for port 2 Name : Core: 2910al-48G [1Gbps] MAC Address : d4c9ef-bbf13e Link Status : Up Port Enabled : Yes Totals (Since boot or last clear) : Bytes Rx : 824,037,067 Bytes Tx : 3,556,387,893 Unicast Rx : 2,952,064,081 Unicast Tx : 3,250,034,877 Bcast/Mcast Rx : 141,824,184 Bcast/Mcast Tx : 3,492,302 Errors (Since boot or last clear) : FCS Rx : 0 Drops Tx : 39,626,532 Alignment Rx : 0 Collisions Tx : 0 Runts Rx : 0 Late Colln Tx : 0 Giants Rx : 0 Excessive Colln : 0 Total Rx Errors : 0 Deferred Tx : 0 Others (Since boot or last clear) : Discard Rx : 0 Out Queue Len : 0 Unknown Protos : 0 Rates (5 minute weighted average) : Total Rx (bps) : 49,881,600 Total Tx (bps) : 41,049,888 Unicast Rx (Pkts/sec) : 1,363 Unicast Tx (Pkts/sec) : 1,227 B/Mcast Rx (Pkts/sec) : 12 B/Mcast Tx (Pkts/sec) : 0 Utilization Rx : 04.98 % Utilization Tx : 04.10 % 

I'll be the first to admit that I am not great at networking, so please excuse me if something is wildly misconfigured. I'm willing to show our config (censored a bit) if that will help troubleshoot this.

Thank you for any help!