2) you have a trunk port on that switch that allows vlan 61
I thought all trunk ports allowed all vlans (and that is why they are trunks)
By default a trunk does allow all vlans but you can configure the trunk to only allow certain vlans on it and many network admins do. It gives you more control of what is allowed where and if you clear a vlan off the trunk then STP no longer needs to run across that trunk link for that vlan. So i simply meant you may have a trunk link where you have specifically configured what vlans are allowed on it. You then add another vlan and a L3 vlan interface as in your example but forget to add that vlan to the trunk link.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...