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New Member

Input discard on Nexus 4001

I have 2 NX4001. Each one has an uplink to a 5K. There is no VPC between the 4K and the 5K. The 5K are  VPC enabled.

There is a large number on input discards on the 4001 interfaces connected to the 5K and is incrementing.

I have a server with smartfailover that is flapping and I think the input discard might be the culprit.

any idea what is the cause on input discard.

Note: All NXOS  to the latest.

Thanks

2 REPLIES
New Member

Input discard on Nexus 4001

Just to get the VPC out of the equation. I moved the 2 4K to the same Nexus 4K and still same issue.

4K1(E1/15)-------(E1/15)---5K---(E1/16)-------4K2

Server has a physical on 4K1 and another Physical on 4K2.

On the 5K I can see the MAC address of the NIC learned from E1/16 and occasionally will flip to E1/15 and bounce back to E1/16.

New Member

Input discard on Nexus 4001

I found the issue for the discard. It was caused by the VLANs on the trunk. There were no destination VLANs on the 4K for all the VLANS defined on the trunk, By allowing only VLANs that exist on the 4K , the input discard counter came to a freeze.

Thanks

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