set interfaces bonding bond0 member interface eth2
set interfaces bonding bond0 mtu 9000
commit

Traceback (most recent call last):
  File "/usr/libexec/vyos/conf_mode/interfaces_bonding.py", line 300, in <module>
    apply(c)
  File "/usr/libexec/vyos/conf_mode/interfaces_bonding.py", line 273, in apply
    b.update(bond)
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/bond.py", line 506, in update
    super().update(config)
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/interface.py", line 1702, in update
    self.set_mtu(config.get('mtu'))
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/interface.py", line 457, in set_mtu
    return self.set_interface('mtu', mtu)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/control.py", line 183, in set_interface
    return self._set_command(self.config, name, value)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/control.py", line 110, in _set_command
    return self._command_set[name].get('format', lambda _: _)(self._cmd(cmd))
                                                              ^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/control.py", line 52, in _cmd
    return cmd(command, self.debug)
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/vyos/utils/process.py", line 155, in cmd
    raise OSError(code, feedback)
FileNotFoundError: [Errno 2] failed to run command: ip link set dev bond0 mtu 9000
returned:
exit code: 2

noteworthy:
cmd 'ip link set dev bond0 mtu 9000'
returned (out):

returned (err):
RTNETLINK answers: Invalid argument

[[interfaces bonding bond0]] failed
Commit failed

[   82.543104] bond0: (slave eth2): Enslaving as a backup interface with an up link
[   82.596964] eth2: mtu greater than device maximum
[   82.778655] bond0: (slave eth2): Releasing backup interface
[   82.784346] 8021q: adding VLAN 0 to HW filter on device eth2
[   82.808107] 8021q: adding VLAN 0 to HW filter on device eth2
[   82.808150] bond0: (slave eth2): Enslaving as a backup interface with an up link
[   82.851745] eth2: mtu greater than device maximum