Does OpenStack support jumbo frame internal networks over a physical network without jumbo frame support?

Question

There are 2 VMs deployed in two different compute nodes in an Openstack environment. Interfaces of the VMs [configured with 9K MTU] are connected via switch [configured with 9K MTU].

ping with jumbo frame [without fragment] is not working between these two VMs.

ping <IP Address> -I <Interface Name> -s 8972 -M do

Answer 1

No. If physical switch between computes is not configured for jumbo frame support then switch would simply drop these packets.

You need to configure all physical devices in between to have jumbo frame support (like switch and compute node NIC card).