topic Re: Correct rc settings for jumbo frames on specific VLAN? in ONTAP Discussions

Correct rc settings for jumbo frames on specific VLAN?

akw_white — Thu, 05 Jun 2025 05:49:11 GMT

Hi all

Sorry for the crosspost but I didn't get any response in the space I originally asked this (it doesn't seem to have much activity)..

I need some advice on how to best configure rc file to enable jumbo frames on startup on some but not all VLANs associated with an interface group.

Setup:

ONTAP 8.0.3 7-mode

Interface group with two VLANs

One VLAN uses MTU 9000 (jumbo frames) the other uses MTU 1500 (regular frames)

What is the correct way to put this info into the rc file? An extract of what I've got at the moment is:

ifgrp create lacp ifgrp01 -b ip e0a e0b

vlan create ifgrp01 2 3

#vlan 2 no jumbo frames

ifconfig ifgrp01-2 `hostname`-ifgrp01-2 netmask 255.255.252.0 partner ifgrp01-2

#vlan 3 with jumbo frames

ifconfig ifgrp01-3 `hostname`-ifgrp01-3 netmask 255.255.255.0 mtusize 9000 partner ifgrp01-3

I know that if I run

ifconfig ifgrp01-3 mtusize 9000

interactively it will set e0a, e0b and ifgrp01 to mtusize 9000 automatically so is it OK to put the mtusize parameter in just this line in rc or do I need to set mtusize 9000 on the other three interfaces (e0a, e0b and ifgrp01) manually as well? Do I need a command to set mtusize 1500 on ifgrp01-2?

Thanks

Adam

Re: Correct rc settings for jumbo frames on specific VLAN?

rweeks — Wed, 20 Nov 2013 05:35:41 GMT

Add mtusize 1500 to VLAN 2. I've setup jumbo on VLAN interfaces many times with the syntax you have set for VLAN 3. Looks good!

Re: Correct rc settings for jumbo frames on specific VLAN?

akw_white — Wed, 20 Nov 2013 05:52:03 GMT

Thanks Randy

So just to clarify, you reckon the following woild be correct?

ifgrp create lacp ifgrp01 -b ip e0a e0b

vlan create ifgrp01 2 3

#vlan 2 no jumbo frames

ifconfig ifgrp01-2 `hostname`-ifgrp01-2 netmask 255.255.252.0 mtusize 1500 partner ifgrp01-2

#vlan 3 with jumbo frames

ifconfig ifgrp01-3 `hostname`-ifgrp01-3 netmask 255.255.255.0 mtusize 9000 partner ifgrp01-3

Regards

Adam

Re: Correct rc settings for jumbo frames on specific VLAN?

rweeks — Wed, 20 Nov 2013 06:04:24 GMT

Correct. I've been doing implementations for about 8yrs and that's how I've always done it

Sent from my iPhone

Re: Correct rc settings for jumbo frames on specific VLAN?

akw_white — Mon, 25 Nov 2013 02:58:02 GMT

Thanks Randy, that did the trick.