DHCP to different VLAN

Several VLANs have been configured on a Catalyst switches. Suppose Window DHCP has been configured for the subnets in different VLANs. What configuration should I need on Catalyst switches so that each subnet can receive DHCP from Window server.

Tks
AXISHKAsked:
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Muhammad BurhanManager I.T.Commented:
Every vlan must have its gateway & broadcast address points to the appropriate DHCP subnet
AXISHKAuthor Commented:
Only one DHCP server in setup on a VLAN3, which will release dhcp range to other subnet.

Is there something like ip-helper that can help to route dhcp request ? Tks
Muhammad BurhanManager I.T.Commented:
DHCP relay is the tool which you could use for make it happen. But it can't work alone you have to specify gateways for vlans too
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AXISHKAuthor Commented:
What's the configuration on Catalyst switch then ? Tks
Muhammad BurhanManager I.T.Commented:
Every vlan broadcast 0.0.0.0 for dhcp request..what you have to do is allow that vlan traffic to the dhcp through proper gateway. The subnet which dhcp offers must routable to the vlan. do some work for communicating them both vlan and dhcp properly
AXISHKAuthor Commented:
Any example to illustrate as I can't get your idea.

Those VLANs are routed within the catalyst switches. Suppose I have 3 VLANs,

VLAN10  192.168.1.0
VLAN20  192.168.2.0
VLAN30  192.168.3.0

DHCP has been installed on VLAN30. On DHCP, I have created 3 DHCP scope for each subnets. What else should I need to configure ?  

Tks
JustInCaseCommented:
Usual way is to configure SVI's for each VLAN along with ip helper-address if you have L3 catalyst switch.
If that's the case (if I remember correctly you asked before some configuration for L3 Cisco Catalyst switches):

VLAN10  192.168.1.0

# interface vlan 10
# ip address 192.168.1.x 255.255.x.x   <-- address of default gateway for vlan configured on DHCP server
# ip helper-address <ip address of DHCP server>

VLAN20  192.168.2.0
VLAN30  192.168.3.0
AXISHKAuthor Commented:
"ip helper-address xxxx" only need to configure on interface VLAN 10 where my DHCP server is hosted. Nothing to do on interface VLAN 20 & 30.

Tks
JustInCaseCommented:
No, that was example for VLAN 10, you need to do that for every vlan you have.
:)
AXISHKAuthor Commented:
For those workstations and servers sitting in VLAN 10, do I need this configuration ? As the DHCP request should able to route within its own VLAN without any problem , correct ?

Tks
JustInCaseCommented:
You don't need ip helper-address only for VLAN where dhcp server is located. You need it for all other VLANs.

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AXISHKAuthor Commented:
Tks
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