Prerequisites for VLANs
The following are prerequisites and considerations for configuring VLANs:
Before you create VLANs, you must decide whether to use VLAN Trunking Protocol (VTP) to maintain global VLAN configuration for your network.
If you plan to configure many VLANs on the device and to not enable routing, you can set the Switch Database Management (SDM) feature to the VLAN template, which configures system resources to support the maximum number of unicast MAC addresses.
A VLAN should be present in the device to be able to add it to the VLAN group.