All x86 NICs should have the L2MTU field as well.

/interface
:put [get [find name="ether1"] l2mtu]

Set the MTU to the L2MTU if you want to run IP frames at the highest supported 
interface value.

/interface ethernet
set [find name="ether1"] mtu=[get [find name="ether1"] l2mtu]

--
Blake Covarrubias

On Oct 16, 2010, at 19:12, Keith Barber <[email protected]> wrote:

> Good evening,
> 
> We are using primarily MicroNocs and Powerouters on our network.  Aka x86 
> boards running intel GigE chips.
> We are noticing that MTU keeps cropping up as a problem for us when 
> implementing EoIP.
> 
> Routerboards now have the L2MTU field.  For these x86 based rigs, how do you 
> tell it to essentially "enable jumbo frame" ?
> 
> 1 post I found said to actually set the IP Ethernet MTU higher than 1500, but 
> wouldn't that lead to other problems?
> 
> I'm hoping there's a solution, and hopefully one that doesn't involve 
> installed RB44G's in each device.
> 
> Thanks in advance.
> 
> -Keith-
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