Quick VLAN Question

Posted on 2005-05-12
Last Modified: 2010-04-10
I know VLAN's pretty well but this one was mentioned today and I don't know that I agree with it.

It was said that VLAN1 communicates will all other vlans by default.  Before I argue that it doesn't, can someone back me up on that?

Question by:Ciscotek
    LVL 19

    Accepted Solution

    Simply - it is not true.  Every VLAN is an exclusive broadcast domain - period.  Without a layer 3 switch or router, VLANs do not talk to each other.  The confusion may have arisen as VLAN1 is the "default" vlan when you have a switch on and therefore all ports are a member of it and can therefore communicate.
    LVL 7

    Assisted Solution

    I agree with you my friend.  What Vlan1 is, is the administrative Vlan.  Meaning it is assigned to a port first.  As you create other vlans.  Vlan2, Vlan3, they are segragated from other vlans.  That's the point of vlans.

    LVL 7

    Expert Comment

    Can you be a little more detailed in your question? VLANs will only communicate with one another only if routing is enabled. Are you asking about the default VLAN? Without routing, no VLAN can communicate with another.
    LVL 7

    Expert Comment

    I think we all agree! :)
    LVL 2

    Author Comment

    Thank you both for your answers.  I feel more confident now.
    New to EE, not sure if I should split points here or not.  Since you were 1 minute apart, I'll split them this time.  Please forgive me if that's not the right way to do it.
    LVL 19

    Expert Comment


    For information on closing questions/assigning points - look at the FAQ in the help area :

    Enjoy EE!

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