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Why Is My VLAN Up Down

Can anyone tell me why when I create a new VLAN it reads up down and when I run the show vlan command I don't see it even if I put an interface in it. I don't understand considering I thought it is nothing but a virtual connection.

4 REPLIES

Re: Why Is My VLAN Up Down

The inteface vlan is a logical interface. Eventhough this is a logical interface it still need a device connected to a port that belongs to the same vlan.

for example:

interface vlan 2 up/up, the example below is to show that the PC is connected to port fa 0/1 that belongs to vlan 2. without the pc/device in fa0/2 the interface vlan 2 will be up/dwon as you are seeing now with your interface vlan x:

pc----vlan 2---fa0/1 switch

Re: Why Is My VLAN Up Down

For the Logical VLAN interface to be Up it requires a physical port in the VLAN to be Up and in the Spanning Tree Forwarding state. This can be an access port or a trunk.

HTH

Andy

New Member

Re: Why Is My VLAN Up Down

Okay, but in any case the physical port that is assigned to that vlan has to read up, up?

Bronze

Re: Why Is My VLAN Up Down

If you want devices to be a member of that vlan then the port has to be in up / up state.

HTH

Arvind

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