VLANs and DHCP

[rusavolk]

Hi everybody,

I have a question related created VLAN. I currently manage flat switched network with around 100 users. The company started expanding and purchased some additional area in the building where we are located. We used to have a quite simple network configuration: one catalyst 3548 switch (located in dabacenter) and catalyst 5505 switch. All of the company servers are connected to 3548 and the users PCs are connected to a 5505. There is a 1Gb fiber connection between the two switches.

Now I have 4 additional switches: two 5505s, one 5509, and one 4908 (layer 3) switch.

I decided to create three VLANs to separate departments. I currently have DHCP running on two Domain controllers Windows 2003 servers.


My question is how can I create VLANs and make sure that the PCs would be able to get IPs from DHCP server I currently have. I run DHCP with 10.10.x.x (class C) private ips addresses.

I do not have any experience setting something up like that. Any explanations, suggestions, or links to other websites/forums would be greatly appreciated.

Thank you in advance,

 

[vipergg]

On the layer 3 switch you create the vlans and give them each their own address space and then on each interface that is not on the dhcp servers subnet you would need to use the ip helper address command on the interface and point it to the address of the dhcp server . Also if you need to have all the vlans on each switch you will have to trunk to each switch so you can pass the multiple vlans to each switch .

 

[rusavolk]

Vipergg,
Thaks for the responce.

I currently have layer2 switches connected to the 4908 switch.

I enable MLS and set them to the same bridge-group and it works.

My probllem is that I do not know how to set a tunnel between Layer 3 switsh and layer 2. (i now how to set one between layer 2 switches).
Could you give me an idea?
thanks.