How to change MTU of Xavier eth0

Continuing the discussion from How to enable flow control of eqos driver for 1GbE J14(3&4):

Software Version
DRIVE OS Linux 5.2.0
DRIVE OS Linux 5.2.0 and DriveWorks 3.5
[*] NVIDIA DRIVE™ Software 10.0 (Linux) (DRIVE OS ver. 5.1.6 )
NVIDIA DRIVE™ Software 9.0 (Linux)
other DRIVE OS version

Target Operating System
[*] Linux

Hardware Platform
[*] NVIDIA DRIVE™ AGX Xavier DevKit (E3550)
NVIDIA DRIVE™ AGX Pegasus DevKit (E3550)

SDK Manager Version
[*] other (1.1.0-6343)

Host Machine Version
[*] native Ubuntu 18.04

Would you tell me how to change MTU of Xavier eth0?
(1GbE J14(3&4) - Dual GbE donble(E3579))

We executed following command on Xavier.
$ sudo ip link set eth0 mtu 9000
But MTU didn’t change. Following message appeared instead.

RTNETLINK answers: Invalid argument

Dear @Tabito.Suzuki,
It is due to Switch Config limitation. Right now it is disabled as we don’t support more than the default value. Hence mac is replying failure