[Openstack] changing MTU setting not working

Satish Patel satish.txt at gmail.com
Thu Nov 10 18:56:44 UTC 2016

In that doc it's not showing how to change MTU of existing created
subnets. currently i am doing following on each veth pair but its not
permanent, so how do i make it permanent across reboot

ip netns exec qrouter-0363480e-01d7-4557-a3b9-e49244aa6a98 ifconfig
qr-9284543e-58 mtu 1500

Is there any way or API so we can change this value in subnet

[root at controller-5-1 neutron(keystone_admin)]# neutron net-show
d9d691c2-ec91-48a1-9813-e472af249dae | grep mtu
| mtu                       | 1450                                 |
[root at ostack-controller-5-1 neutron(keystone_admin)]#

On Thu, Nov 10, 2016 at 12:35 PM, Rick Jones <rick.jones2 at hpe.com> wrote:
> On 11/10/2016 09:23 AM, Satish Patel wrote:
>> 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 ?
> You would likely have to find all the virtual interfaces for it and alter
> them manually on the compute/network nodes.
> The HPE Helion docs on changing MTU, while describing some things specific
> to HPE Helion, does include the caveat about existing networks not being
> altered:
> https://docs.hpcloud.com/hos-3.x/#helion/networking/configure_mtu.html
> rick jones
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