Since you have a high speed environment in your network with speeds of up to 40 gbps, the thing that you need to enable on your equipment to improve the performance is option B: Jumbo frames.
By using 9k jumbo frames to send the same data, fewer frames—only 14,000—need to be produced, saving up 4 Mbps of bandwidth. These CPU and bandwidth savings can result in some considerable improvements in network speed.
Only use jumbo frames if you can configure all of your equipment with an MTU of 9000 and have a dedicated network or VLAN. A distinct SAN, or storage network, is a good illustration of this strategy.
Therefore,Jumbo frames in computer networking are Ethernet frames with a payload size greater than 1500 bytes, as defined by the IEEE 802.3 standard. Jumbo frames can often store up to 9000 bytes of payload, although there are minor and bigger variances, thus some caution must be used.
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See options below
Spanning tree
Jumbo frames
Link aggregation
Flow control
Change the MTU to 1300
