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figure out..  just need to restart neutron-server  and you have to
delete existing network and re-create new network to get those change.

How to change MTU on existing network-subnet ?

On Thu, Nov 10, 2016 at 12:20 PM, kamalakannan sanjeevan
<chirukamalakannan at gmail.com> wrote:
> Satish,
>
> You can try restarting all Nova and neutron services.
>
> Kamal
>
>
> On 10-Nov-2016 10:44 pm, "Satish Patel" <satish.txt at gmail.com> wrote:
>>
>> We have multi-node cluster and i am trying to change MTU setting of
>> qrouter but it doesn't working.
>>
>> default MTU setting on neutron router interface is 1450 MTU  i want to
>> change to 1500
>>
>> [root at controller neutron(keystone_admin)]# ip netns exec
>> qrouter-b17c9641-27f7-4328-82b0-c3132cccdcf1 ifconfig | grep mtu
>> ...
>> qr-edb341ca-ac: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1450
>>
>>
>> I have changed following file
>>
>> neutron.conf   ->  global_physnet_mtu = 1550
>> ml2_conf.ini    ->  path_mtu = 1550
>>
>> and restarted following services
>>
>> systemctl restart neutron-openvswitch-agent
>> systemctl restart neutron-l3-agent.service
>> systemctl restart neutron-server.service
>>
>>
>> Now i am creating new router and attaching subnet but still its using
>> 1450 MTU what is the solution for it? do i need to reboot BOX??
>>
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