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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