set int eth eth2 vrf 'green'
set vrf name green table '1000'

vyos@vyos# del int eth eth2 vrf 
[edit]
vyos@vyos# commit
[ interfaces ethernet eth2 ]
VyOS had an issue completing a command.

We are sorry that you encountered a problem while using VyOS.
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  https://support.vyos.io/
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Report time:      2021-10-02 11:52:12
Image version:    VyOS 1.3.0-epa1
Release train:    equuleus

Built by:         Sentrium S.L.
Built on:         Tue 28 Sep 2021 14:11 UTC
Build UUID:       e67d1006-5116-444a-b984-e3c21de20f5d
Build commit ID:  701f08deb2cd8f

Architecture:     x86_64
Boot via:         installed image
System type:      KVM guest

Hardware vendor:  QEMU
Hardware model:   Standard PC (i440FX + PIIX, 1996)
Hardware S/N:     
Hardware UUID:    ae57d426-8024-4a63-8146-e3293d6f90c3
Traceback (most recent call last):
  File "/usr/libexec/vyos/conf_mode/interfaces-ethernet.py", line 163, in <module>
    apply(c)
  File "/usr/libexec/vyos/conf_mode/interfaces-ethernet.py", line 152, in apply
    e.update(ethernet)
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/ethernet.py", line 340, in update
    super().update(config)
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/interface.py", line 1307, in update
    self.set_vrf(config.get('vrf', None))
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/interface.py", line 505, in set_vrf
    self.set_interface('vrf', vrf)
  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/util.py", line 161, in cmd
    raise OSError(code, feedback)
OSError: [Errno 255] failed to run command: ip link set dev eth2 master None
returned: 
exit code: 255

noteworthy:
cmd 'ethtool --show-pause eth2'
returned (out):
Pause parameters for eth2:
returned (err):
Cannot get device pause settings: Operation not supported
cmd 'ethtool --show-pause eth2'
returned (out):
Pause parameters for eth2:
returned (err):
Cannot get device pause settings: Operation not supported
cmd 'ip link set dev eth2 master None'
returned (out):

returned (err):
Error: argument "None" is wrong: Device does not exist

vyos@vyos# del int eth eth2 vrf 
[edit]
vyos@vyos# commit
[edit]
vyos@vyos# run show conf
interfaces {
    ethernet eth0 {
        hw-id 0c:5a:02:a0:00:00
    }
    ethernet eth1 {
        hw-id 0c:5a:02:a0:00:01
    }
    ethernet eth2 {
        hw-id 0c:5a:02:a0:00:02
    }
    ethernet eth3 {
        hw-id 0c:5a:02:a0:00:03
    }
    loopback lo {
    }
}
system {