I have created L2 vlan & SVI's on core switch. but it shows status UP, Line protocol DOWN.
Vlan11 x.x.x.x YES manual up down Vlan21 x.x.x.x YES manual up down Vlan31 x.x.x.x YES manual up down Vlan91 x.x.x.x YES manual up down
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In order for a VLAN interface to be up, the VLAN needs to be configured on a access port (Directly connected hosts) or the VLAN needs to be allowed over a trunk. Mind you that the interface or trunk need to be up for the VLAN interfaces to come up
You can configure access ports assigned to those VLAN's and use the command no keepalive command to bring those ports up, without having something actually connected to the physical port