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I have configured multiple Vlan under a single interface. For operations need we have to change two Vlan, so i have just changed the Vlan id and name only other all information like IP address, route all are unchanged. After applying the configuration now i am seeing four Vlan. Two old vlan and two new vlan.
N.B. I have just changed the Vlan ID 244,242 with 254,252
When you remove an interface completely from your netplan config, netplan (or specifically, networkd) can no longer distinguish between a removed config and an interface that you have manually configured outside of netplan. You can remove the no-longer-used vlans manually at runtime from the command line after applying the netplan config, or you can reboot the system to get a clean network state.
ip address delete dev en0.999 as shown at manpages.ubuntu.com/manpages/trusty/man8/ip-address.8.html . Unfortunately, you cannot do this and activate interfaces via netplan at the same time, so you may get locked out of the node one way or another.
– Stefan Lasiewski
Sep 4 '20 at 1:30
