2821 ISR vlan command missing?

[jwatt2022]

ok, guys, I know this is an OLD device, but it belongs to a nonprofit and they can't afford new equipment now.

they have a 2821 ISR running Version 15.1(1)T.  they need to add a few vlans but the vlan subcommand is not available.  I am using the command int vlan [XX]

They did have a static IP set on the inside interface, but I removed it.

what I am trying to do is set up vlans for their staff, guests and live stream system

what am I missing?   

thanks in advance

[balaji.bandi · Accepted solution]

This is Router - Interface vlan not going to work (since this is Switch command)

You can do sub interface, that should work - can you post show run

example :

interface GigabitEthernet0/0
no ip address
duplex auto
speed auto
!
interface GigabitEthernet0/0.1
encapsulation dot1Q 20   ( VLAN 20)
ip address xxxxxxxxxxxxxxx
ip nat inside
!
interface GigabitEthernet0/0.2
encapsulation dot1Q 30 ( VLAN 30)
ip address xxxxxxxxxxxxxxxxxxxxxxxxx
ip nat inside

[jwatt2022]

thank you!  don't know why that didn't occur to me!  

[MHM Cisco World]

you need as I know switch module to make router accept the VLAN config, otherwise all port is L3 router port and router don't accept VLAN config.

https://www.cisco.com/c/en/us/td/docs/routers/access/interfaces/nm/hardware/installation/guide/conneths.html