We have been been troubleshooting output drops on interfaces on a Cisco 3750E that connect to numerous Netapp FAS6080 filers. We use througput test devices to send data directly to a netapp and to a netapp through a Cisco 3750e switch. The switch interface generates output drops. However, the switch doesn't create output drops when the netapp is replaced with a server or a laptop. So the issue of output drops occurs when a specfiic NetApp device is sending/receiving data with a Cisco 3750E switch. Additionally, We don't have the issue with a Cisco 3750G switch. Does NetApp have something listed in the compatibility matrix or is this new?
A socket happens at layer 5 of the OSI model. Ethernet Flow Control happens at layer 2.
Flow control enables you to manage the flow of frames between two directly connected link-partners. Flow control can reduce or eliminate dropped packets due to overrun.
To achieve flow control, you can specify a flow control option that causes packets called Pause frames to be used as needed. For example, link-partner A sends a Pause On frame to link-partner B when its receive buffers are nearly full. Link-partner B suspends transmission until it receives a Pause Off frame from link-partner A or a specified timeout threshold is reached.