I have come up with a design for one of my offices, I am going to have 1 vlan per floor, there are 3 floors with about 50 machines on each, So what I have done id subnet a class c address off to a /26 for each floor. I will have 1 dhcp server on site. First of all , Is this a good design, and secondly how would I get my dhcp server to issue the subnetted class C addresses to these vlans
Now to assign each vlan withs its subnet ip range you have to create 2 different dhcp pools.
Can you config will you be configuring cisco layer 3 switch or router as DHCP server or some external dhcp server like windowns etc etc and which device you will be using for intervaln routing between 3 vlans , router or layer 3 switch?
Yes that the best practice that is generally used, a dedicated windows server with DHCP funcationality.
Once you are done with the DHCP pool configuration and DHCP settings on the server, you just need to use command " ip helper-address " under the router interface from where the DHCP request will be originated to reach the DHCP server in diff vlan.
For example, if your DHCP server is in Vlan 10 and you have vlan 20 and 30 also and the clients in vlan 20,30 wants to get an Ip from DHCP, do the following config under the vlan interface :
interface vlan 10
ip add x.x.x.x
interface vlan 20
ip add y.y.y.y
ip helper-address x.x.x.* <-- IP of the DHCP server
interface vlan 30
ip add z.z.z.z
ip helper-address x.x.x.* <-- IP of the DHCP server.
They will be diff ofcourse. It depends on your IP addressing scheme that you want to use,For ex.. you might want to create 192.168.10.0/26 for vlan 10, 192.168.20.0/26 for vlan 20 and 192.168.30.0/26 for vlan 30.
No, When the DHCP broadcast request will come to the vlan interface for the DHCP request, the vlan interface with ip helper configured makes a unicast request to the DHCP server which is conifgued in the ip helper command. The request will directly to go to the DHCP server and a reply back will be forwarded to the requesting client.
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