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Thanks Remo,
                      this is exactly what i am looking for with this
changed to 8000 and dhcp-option-force=26,8000 will all interface
created for that instance get this MTU or just veth pairs.I mean will
it change MTU of bridge created for each instance ie qbr-portid , its
veth pairs qvb-portid ,qv0-portid then patch ports between br-tun and
br-int.My switch supports upto 9000 and i can change eth0 MTU 8000+
(ip header+GRE+VLAN).
I was thinking for writing a script to change MTU of all interfaces
connected to vms,your information was very helpful

On Mon, Feb 9, 2015 at 2:08 AM, Remo Mattei <Remo at italy1.com> wrote:
> If you are using neutron you need to change it there
>
> ovs_neutron_plugin.ini agent veth_mtu 1500 for example.
>
> Remo
>> On Feb 8, 2015, at 11:56, mad Engineer <themadengin33r at gmail.com> wrote:
>>
>> Hello all is there any way we can change MTU of all relevant
>> interfaces of instances,if i set
>> dhcp-option-force=26,1400 will it change MTU of all relevant
>> interfaces like qbr qvo br-int etc etc
>> is there any way to change MTU of all neutron interfaces.
>>
>> Thanks
>>
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