When configuring an interface with the `disable` keyword and a saved config it is expected that the interface will stay admin down even after a reboot.
This is not the case, after a reboot the interface is admin up, besides the fact that the CLI tells us it is admin down.
To reproduce:
```
set interfaces ethernet eth2 vif 15 address 192.0.2.1/24
set interfaces ethernet eth2 vif 15 disable
commit
save
```
```
vyos@vyos:~$ show interfaces | match eth2.15
eth2.15 192.0.2.1/24 A/D
vyos@vyos# run reboot now
```
After a reboot
```
vyos@vyos:~$ show interfaces | match eth2.15
eth2.15 192.0.2.1/24 u/D
```
### Reproduce on crux
```
set interfaces ethernet eth1 vif 20 disable
set interfaces ethernet eth1 disable
commit
```
```
delete interfaces ethernet eth1 disable
commit
```
This will automatically enable the sub interface
```
7: eth1.20@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 00:50:56:b3:09:07 brd ff:ff:ff:ff:ff:ff
inet6 fe80::250:56ff:feb3:907/64 scope link
valid_lft forever preferred_lft forever
```
### Reproduce with iproute2
Using simple iproute2 commands:
```
ip link add link eth1 name eth1.20 type vlan id 20
ip link set dev eth1.20 down
ip link set dev eth1 down
ip link set dev eth1 up
```
```
98: eth1.20@eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state LOWERLAYERDOWN group default qlen 1000
link/ether 00:50:56:bf:ef:aa brd ff:ff:ff:ff:ff:ff
```