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Networking & wireless forum: VLAN Question...

by: Grub32 May 11, 2012 6:02 PM PDT

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VLAN Question...

by Grub32 - 5/11/12 6:02 PM

I want to premise this by saying that I am a technology coordinator for a school district with a background in education.

I have technicians that work for me that handle my servers and keep up on maintenance. I decide what we are going to buy and why.

I had a company come in to put in a wireless system...no names included...That could not complete the task because my VLANs were not setup correctly.

When I set up a VLAN, when you set the IP configuration for the VLAN, you use the IP address for the device, switch or router that you are trying to connect the VLAN to correct?

That is what I was trying to configure and they were telling me my network was not setup correctly and that I should pay them extra to get it done right.

Thanks for any and all help,

Grub


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vlans

by bill012 - 5/12/12 3:57 AM

In Reply to: VLAN Question... by Grub32

A vlan is nothing more than a virtual switch so you must do everything would do with a real switch. Technically a switch needs no IP itself, look at all the unmanageable switches you can buy that you just plug cables into. So in a switch all you really do is define ports to separate traffic.

The messy part is if a switch is layer 3 which means it also contains a router. Be careful yours may not it tends to increase the price of the units. What happens in a layer 3 switch is you now create a virtual interface. Although it is virtual it works the same as if you had a router with multiple physical interfaces plugged to multiple switches. You must do all the work you would do for each. Default gateways,DHCP scopes, etc.
You must also configure the routing so that traffic will flow between the virtual interfaces. This part normally works by default but you now have 2 complete networks on this device which I would assume is connected to another router somehow. That router needs to have routing in it to know to send the 2 networks to your device.

Note if your switch is only layer 2 you now have the issue of how do I extend these vlans over a single cable to the device that can do routing. This is called 802.1q which if you need configured I would just pay someone or you can google and study it.


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VLAN Question...

by Grub32 - 5/12/12 4:25 AM

In Reply to: vlans by bill012

Thanks for the info...On our switches already, we have 2 vlans to connect them to our core switch and to the fiber appliance that brings the connection into the school.

I understand how to route the ports with tagging and trunking. I just want to make sure that when I set up the new VLANs on all the other switches that I tell the tagging to go to the controller by IP address. Is that the way I should be doing it?

Thanks,

Grub


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tag/ip

by bill012 - 5/12/12 6:21 AM

In Reply to: VLAN Question... by Grub32

Sound like you route in the core so your switches use the tagging to get there. All you really have to do is ensure you have the new vlans tagged on your trunk ports. This should allow all devices in that subnet to reach the gateway. Remember vlans operate on the mac address not the IP. Devices will determine their path to other devices via broadcasts and ARP requests. You really have to do nothing other than create the path.

Note if you are using cisco switches they use a special protocol call VTP to propagate vlans definitions to all switches and by default allow all vlans on all trunk ports. Pretty much you define a vlan on a single switch and all switch in the network will be able to use it without any special configuration.

Other vendors you will have to configure each switch and each trunk


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