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Fail-Over DHCP server with multiple scope

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Last Modified: 2020-01-18
Hi,

I am trying to setup Hot standby DHCP server2012 (two DHCP server with multi-scope)
192.168.0.0
192.168.1.0
192.168.2.0
I am using two servers with fail-over DHCP configuration. (Hot standby) with IP address
192.168.0.1 for server 1 and 192.168.0.2 for server 2

In the Cisco 3750 switch I created 3 vlans
Vlan 10 with an IP address 192.168.0.3
Vlan 20  with an IP address 192.168.1.1
Vlan 30  with an IP address 192.168.2.1

In the configuration I added IP helper-address command to refer DHCP servers
Under each Vlan interface I added two IP helper address

Under Vlan 10
ip helper-address 192.168.0.1
ip helper-address 192.168.0.2

And so on for Vlan 20 and Vlan 30

The computers work fine and got IP address and getaway for each Vlan. However, I tried to test the fail-over DHCP and I shut down the DHCP server with an IP address 192.168.0.1 and waited to get computer an IP from second DHCP server but it's not working. I Release and renew IP and nothing changed.

Is there any missing part of my configuration?

Thanks
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Senior Network Systems Specialist
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Commented:
No, it sounds okay from what you have configured. I would check routing to make sure all your VLANs can each both DHCP servers and make sure the helper addresses are configured for each subnet on each switch/router.
AlexA lack of information provides a lack of a decent solution.
CERTIFIED EXPERT

Commented:
Putting it bluntly, you'd be better off migrating your 2012 boxes over to 2016 or 2019 and then using the windows DHCP failover clustering.

regards
Alex

Author

Commented:
Hi,
I can ping from each computer to both servers or other computers.
Thanks

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