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MVP
Posts: 1,412
Registered: ‎11-30-2011

DCHP server behaviour with master redundancy

does anyone have experience with the build in DHCP server in a master redundancy setup? i got two masters in master redundancy setup on a vlan where the APs are also located and setup DHCP there. but when an AP does a DHCP request which controller will answer?, i see a risk on duplicate IPs being handed out here.

Guru Elite
Posts: 20,759
Registered: ‎03-29-2007

Re: DCHP server behaviour with master redundancy

They both answer.  You would have to use a split scope on both.

 



Colin Joseph
Aruba Customer Engineering

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MVP
Posts: 1,412
Registered: ‎11-30-2011

Re: DCHP server behaviour with master redundancy

thanks for confirming that cjoseph. i figured as much but to try to build a test setup for this felt a bit too much.

 

when i do something like pool of 128 adresses on controller 1 and 128 addresses on controller 2 and one of the is full, will that have negative impact on the dhcp in general or will the client just pick up the dhcp offer from the controller which has room?

Guru Elite
Posts: 20,759
Registered: ‎03-29-2007

Re: DCHP server behaviour with master redundancy


boneyard wrote:

thanks for confirming that cjoseph. i figured as much but to try to build a test setup for this felt a bit too much.

 

when i do something like pool of 128 adresses on controller 1 and 128 addresses on controller 2 and one of the is full, will that have negative impact on the dhcp in general or will the client just pick up the dhcp offer from the controller which has room?


It is identical to any environment where you have more than one device giving out ip addresses to clients for the same subnet.  You have to split the scope/exceptions between both controllers or use a centralized DHCP server.  Otherwise, the DHCP servers will give out duplicate ip addresses.

 



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

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