Cisco IP Helper Address

Hi Guys

Environment:
Small environment (40 x VMs, Single building)
Cisco 3750 Series Core switch x 2 (24-port) Stacked

We have one IP Helper Address assigned to our Primary Domain Controller for DHCP purposes.
We have a secondary Domain Controller which I have configured to Load Balance IP addresses (50/50 split) for HA. However, this is not going to work as the Core Switch will only see the single IP Helper Address.

How do I add a secondary IP Helper Address on the Core Switch to include the secondary Domain Controller?

In advance thank you for your support.
LVL 2
CTCRMInfrastructure EngineerAsked:
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netcmhCommented:
You can add the config:

interface VlanX
 ip address <IP ADDRESS>
 ip helper-address <IP ADDRESS of DHCP SERVER>
 ip helper-address <IP ADDRESS of ANOTHER DHCP SERVER>

DHCP server handles the dual DHCP offer properly. Usually the first DHCP server to respond wins. A commonly used method for DHCP redundancy is to split the scope, for example: /24 subnet divided it into two /25s - one per server.
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Pete LongTechnical ConsultantCommented:
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CTCRMInfrastructure EngineerAuthor Commented:
Thanks Guys, just the information I need.
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netcmhCommented:
Excellent! Thanks for the grade. Good luck!
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