lets imagine the following situation:
There is 5 interfaces (vlans) and 5 vrrp groups and everything working fine.
I'm going to create 6th vlan + 6th vrrp group.
if I've crate 6th vrrp group but forget to create 6th vlan interface and execute "commit" command, the VRRP will stop working completely!
Here is VRRP log:
```
Aug 15 22:38:11 R9 Keepalived_vrrp[29368]: Opening file '/etc/keepalived/keepalived.conf'.
Aug 15 22:38:11 R9 Keepalived_vrrp[29368]: (Line 61) WARNING - interface eth0.356 for vrrp_instance VLAN-356 doesn't exist
Aug 15 22:38:11 R9 Keepalived_vrrp[29368]: Non-existent interface specified in configuration
Aug 15 22:38:11 R9 Keepalived_vrrp[29368]: Stopped
Aug 15 22:38:11 R9 Keepalived[29367]: Keepalived_vrrp exited with permanent error CONFIG. Terminating
```