# [OmniOS-discuss] Changing the mtu of a vlan interface

David Seira dseira at stackscale.com
Thu Jan 23 10:34:05 UTC 2014

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    Yes, but the problem is that with ifconfig the changes are not persistent.

    2014/1/22 Zach Malone <zmalone at omniti.com>:
    > I bet the old ifconfig mtu commands will work, even if dladm won't
    > modify the interface.
    >
    > On Wed, Jan 22, 2014 at 11:09 AM, David Seira <dseira at stackscale.com> wrote:
    >> Hi all,
    >>
    >> I'm trying to figure out how change the mtu of a vlan interface once
    >> it is created.
    >>
    >> First I've created the aggr interface with the mtu 1500. Then I've
    >> created a vlan for this interface with the same mtu.
    >>
    >> Next I want to change the mtu of this connection. First I've changed
    >> the mtu of the aggr:
    >>
    >> #dladm set-linkprop -p mtu=9000 aggr0
    >>
    >> But the problem comes when I've tried to change the mtu of the vlan
    >> interface with the same command; I receive the next message:
    >>
    >> dladm: warning: cannot set link property 'mtu' on 'aggr0.164':
    >> operation not supported
    >>
    >> I've also tried disable the interface but with the same result.
    >>
    >> If I delete and create the vlan interface again (with the aggr0 with
    >> the mtu 9000) it works.
    >>
    >> I don't understand why is not possible to change the mtu of a vlan
    >> interface once it is created.
    >>
    >> Is possible? How can I do that?
    >>
    >>
    >> Regards,
    >> David
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