vlan DHCP/Routing

[Joli Martinez]

I have two questions, I have a 2950 switch.  I want to create three vlans.  My first question is do I need a layer 3 switch to connect my vlans together, or is there a command to do that.  My next question is how to I handle DHCP for my vlans.  My setup is vlan1 for server, vlan2 for my LAN and vlan3 for wireless clients.

I only have one dhcp server and i dont want vlan2 to talk to vlan3

please help

thanks

[ankugarg]

Hi Joli,

Yes,you need layer 3 switch or router to get your vlans talking with each other.

On dhcp server,define three pools for each of vlan1,vlan2,vlan3 with different subnets...Now for each for "int vlan 1",int vlan 2","int vlan 3" give the ip from each of the respective pools of vlan....Devices in each vlan will automatically pick up the ips from their respective subnet from dhcp server.

[jandelbasanal]

Hi Joli,

Ankur is right, since your vlan's are dirrectly connected to your layer 3 switch it can talk to each other. If you dont want some vlan's to talk to other vlan's then you need ACL to filter the traffic between them or any direction.

Hope that helps,

Jandel

[leifhegdal · Accepted solution]

In regards to IP helper I have found this article to give good info: http://routergod.com/trinity/

[Joli Martinez]

Can I use an 871 router to route between all three vlans and the internet or do I need a dedicated layer3 switch?

[cadet alain · Accepted solution]

Hi,

You can use a router if you want to.

Regards.

Alain.

[Joli Martinez]

Thanks