If a managed switch and all attached devices both support VLANs and Jumbo Frames, is it possible to mix VLANs with jumbo frames and VLANs with standard frames on the same switch port / ethernet card?

If it is possible, should I expect it to work in any environment or there are specific items (server ethernet card, ethernet card driver, server operating system, switch brand/model, etc.) that could cause problems in such a mixed environment?

  • 1
    You can definitely trunk VLANs with different jumbo frame settings so by extension, I'm confident you could tag them to an access port. What I'm not sure about is how your client device will handle it. I am curious as to why, though - you'd generally give iSCSI / NFS its own access ports / NICs.
    – Dan
    Nov 30, 2012 at 12:03
  • Check out the bottom part of this doc: communities.netapp.com/blogs/ethernetstorageguy/2009/09/12/…
    – kubanczyk
    Nov 30, 2012 at 12:31
  • @Dan, we have to aggregate two LANs (currently on independent ports/switches), one is for generic LAN traffic (MTU=1500) and the other is dedicated to a DRDB link (MTU=9000). The port currently used for DRBD will be dedicated to a new iSCSI SAN but we need to keep DRBD going for a brief period to allow migration. Disabling Jumbo on the DRBD VLAN wouldn't be a problem (it's already vastly underutilized), but the whole thing prompted me to reason about the mixing MTUs issue in general and thus asking here on SF.
    – Luke404
    Nov 30, 2012 at 13:04
  • @Luke404, how did you end up setting up the network? Did the mixing work?
    – hvrauhal
    Feb 12, 2018 at 7:20
  • 1
    @hvrauhal yes it did, see my answer :)
    – Luke404
    Mar 15, 2018 at 13:35

1 Answer 1


After testing and using it for some months, I can say that yes it works.

The switch MTU settings acts merely as it names suggests, a maximum transfer unit [size]. Increasing it above what a VLAN hosts are actually using will not affect traffic in any way that I know of.

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