This will allow the ping to succeed even if jumbo frames aren’t configured correctly on the network. As provided this ping test will allow fragmentation of packets, allowing the ping to be broken into smaller frames for retransmission. I have some feedback on the validation piece though. If the computer your on has Jumbo Frames enabled you can also perform a ping test. If you have the VSAN health check enabled it does a health check on MTU size: Go to one of your hosts -> Configuration -> Networking -> vSphere Distributed Switch -> Manage Virtual Adapters -> Select a vmk -> Edit: Now that the switch supports up Jumbo Frames let’s enable it on a vmk virtual adapter. Source: VMware KB 1038828 – Enabled Jumbo Frames on virtual distributed switches Enable Jumbo Frames on VMKernel: In the Maximum MTU box change it from 1500 to 9000 then click Ok:įor Standard Switches: Go to vSphere Standard Switch -> Properties -> with vSwitch selected click Edit -> then change MTU to 9000: If you are using Distributed Switches right click the vDS then Edit Settings: Now that you confirmed you can physically support Jumbo Frames your ready to enable it in vSphere. My Dell T620/R520 both have Broadcom NetXtreme 5709 which in fact support Jumbo Frames. If they are server NICs then they should. The next step is to ensure the NICs in your servers support jumbo frames. When enabling it on my Cisco switches a switch reboot was required: I’ll do some speed tests later to compare! Hardware Requirements:īefore you start out on this quest ensure your physical switch support jumbo frames. Wanted to make a quick post about enabling Jumbo Frames in my VMware environment! My switches (Cisco SG-200 & SG-500) support Jumbo Frames so I thought why not? It would surely help push more data through the network for faster for VSAN and vMotions.
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