Mailing List Archive

vif front/back mtu alignment

I have encountered an issue when using openvswitch, vxlans and xen. The
default openvswitch behaviour is to configure the mtu of all interfaces
in a switch to the smallest value. When a vxlan interface is added to a
switch the result is that the smallest mtu is 1450 and this gets applied
to the vif backend interface. This change does not communicated to the
frontend vif so in the backend domain we get kernel warnings about
packets being received > mtu. Should xen automatically keep the
front/back mtu in alignment?


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