[ovs-discuss] Increase MTU of specific VLANs

[Daniel Dehennin]

Hello,

I have 3 hypervisors with two OVS bridges:

- phybr0: connected to physical infrastructure though bond0 trunk to give
  access to physical VLANs

- vibr0: for user virtual networks disconnected from physical
  infrastructure, 1 network == 1 VLAN

Each hypervisor has an lan0 interface on a dedicated VLAN:

    ovs-vsctl add-port phybr0 lan0 lan=702 -- set interface lan0 type=internal

I linked each hypervisor vibr0 to the next one with VXLAN using the lan0
IP address:

- nebula1 

    ovs-vsctl add-port vibr0 nebula2 -- set interface nebula2 type=vxlan options:remote_ip=@IP_nebula2

- nebula2

    ovs-vsctl add-port vibr0 nebula1 -- set interface nebula1 type=vxlan options:remote_ip=@IP_nebula1
    ovs-vsctl add-port vibr0 nebula3 -- set interface nebula3 type=vxlan options:remote_ip=@IP_nebula3

- nebula3

    ovs-vsctl add-port vibr0 nebula2 -- set interface nebula1 type=vxlan options:remote_ip=@IP_nebula1


The bond0 intefaces has an MTU=9000, I want to increase the lan0 MTU to
9000 to avoid the following errors:

    Aug 24 14:34:05 nebula2 kernel: [15615.881948] lan0: dropped over-mtu packet: 1554 > 1500

Is there a solution?

Regards.

-- 
Daniel Dehennin
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