I have a RB2011UAS-RM running a network. Ether1 is connected to the WAN and Ether2-Ether10 is connected to the rest of my network. Most of my hardware is connected to a switch off of ether2, there are some other random things on ether3 through ether10, but nothing that gets much usage.
My Switches, RAID Arrays, etc are all capable of running Jumbo Frames. I know the RB2011 only supports MTU of 4017 (or so). My question is can I enable jumbo frames on my switch, raid array, etc? … because technically if I do that it would exceed the MTU of the RB2011 ether port. Any guidance would be helpful.
The Atheros 8327 is capable of jumbo frames, so it might be possible that the switch chip pass bigger frames. But what will happen if such a frame hits the internal CPU?
Right. So the max is 4074. So if I enable Jumbo (9000) frames on the switches and they show up at the Routerboard would they get dropped? Or fragmented?.. or what exactly would happen?
9000 byte frames on RB2011 interface with 4074 byte MTU would get fragmented and passed futher. If those frames contain DF flag, they would be dropped.