Forums

Home / Forums

You need to log in to create posts and topics. Login · Register

Jumbo frames and VLANs


wluke
66 Posts
January 12, 2022, 4:11 pm

Hi,

I plan to use 4 x 10G NICs LACP bonded for both management and backend networks, and split the networks into different VLANs.

The backend network will use jumbo frames, however the management network will not. As such all the physical interfaces will need jumbo frames, as will the bond, but the VLANs will need different sizes.

I'm at the new cluster setup / deployment network settings page, and I can't see where in the UI I can configure the jumbo frame settings per VLAN or against the management or backend networks.

Is it possible to set this manually in the config, or am I missing somewhere in the UI to set it?

Thanks,

Will

#1

admin
2,930 Posts
January 12, 2022, 5:09 pm

You enable jumbo on the physical interfaces, not specific vlans on the interface.

#2

wluke
66 Posts
January 12, 2022, 6:32 pm

I require 1500 MTU for my management network (VLAN1) and 9000/jumbo for the Backend network (VLAN20). How would I configure this?

Normally in Linux I'd set the MTU on the VLAN interface.

Thanks

#3

wluke
66 Posts
January 12, 2022, 7:07 pm

Effectively, running "ip link set bond0.1 mtu 1500" once things are up sorts the network how it should be (changes the management VLAN 1 from 9000 to 1500 MTU). Is there a way to do this in the config or a "post boot" type script?

#4

admin
2,930 Posts
February 6, 2022, 2:08 pm

You can customize network via scripts

/opt/petasan/scripts/custom/post_start_network.sh.example

rename from .example and write any network configs you want.

Currently in PetaSAN we only support setting MTU on networks other than management, we also enable MTU per interface and not per individual VLANs.

#5

wluke
66 Posts
February 8, 2022, 10:20 am

Perfect, that should let me set the management VLAN to MTU 1500 instead of 9000.

Currently I've all VLANs over the same 4x10G LAG, and so the interface itself must have an MTU of 9000.

#6