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> I thought about it, but yet not tried. Which OVS port would you
> recommend to increase MTU ?
> On the network node (br-ex or qg-XXXX) , or on the compute node (br-int) ?

You need to set it on the compute nodes ( int-br-ethX ) and possibly the an extra port on the routing node.
(we use a bridge-mapped network to connect to the "outside" world and phy-br-eth1 needs to be set)

Cheers,
Robert