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This is gonna hurt the os , but for this , you will need to change these
parms inside the neutron db. Which , for  me at least, was asked to avoid
at maximum.

On Nov 11, 2016 12:07 AM, "Satish Patel" <satish.txt at gmail.com> wrote:

> 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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