Cisco Trunking Between Switches

Posted on 2005-05-06
Last Modified: 2010-04-10
Quick question, just for general knowledge:

If I have a VLAN, say VLAN 10 and I have users that are on two different switches, say Cat 5k's, do I trunk between these two switches?  

In other words, if I have users hanging off two switches, and I have these two switches connected via FE1/24, how would I get users on the same vlan between these two switches?
Question by:Hollmer
    LVL 79

    Accepted Solution

    Yes, you have to trunk between the switches. Trunking is simply passing the VLAN data information between the switches, so that they all know about all the vlans and if you assign a port to vlan10 on switch 2 and another port from switch3 to vlan 10, the two devices can talk to each other.
    If this is the first time they are going to be connected together and share VLAN information, you might want to setup VTP first and make sure you only have one server with the vlan database and all others are either transparent or client..
    LVL 1

    Author Comment

    That was actually my next question.  How do the switches know that Vlan 10 on switch 2 is the same as Vlan 10 on switch 3?  From what I've worked with, it seems that they work independantly unless you use a router somewhere in the mix.

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