topic Re: Vlan interface is down at C9800 in Wireless

Vlan interface is down at C9800

interfacedy — Wed, 14 Jul 2021 04:41:48 GMT

Please see the below. Why the vlan20 is down? Thanks

Mark Elsen — Wed, 14 Jul 2021 07:13:10 GMT

- Post the output of : show run int vlan20

Leo Laohoo — Wed, 14 Jul 2021 09:51:01 GMT

conf t
 interface vlan 20
 no autostate
end

Arshad Safrulla — Wed, 14 Jul 2021 22:24:26 GMT

Create the L2 VLAN

vlan 20

name XXXX

interfacedy — Thu, 15 Jul 2021 01:28:40 GMT

Leo is right. Issue resolved. Thank you

Why other vlan could be up without this command?

Leo Laohoo — Thu, 15 Jul 2021 01:33:55 GMT

@interfacedy wrote:

Why other vlan could be up without this command?

Because no ports are assigned to VLAN 20.

VLAN 10 is UP because it is probably in the Trunk already while VLAN 20 is not in the Trunk.

interfacedy — Thu, 15 Jul 2021 02:20:48 GMT

Right, Thank you very much!