How to configure L2 & L3 VLAN is a cisco switch ?

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Cisco Switch

L2 VLAN

Go to configuration mode - run command vlan 10 then exit

For L3 VLAN

In Global Config Mode

int vlan 10

ip address 10.1.1.10 255.255.255.0

exit

To make this SVI up, make sure one interface is in forwarding state for spanning tree.

Vlan 10 should also exist , otherwise SVI will be down.