WLC dynamic Interface /w primary and secondary DHCP

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Apr 15th, 2010
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Dear All, i configured a dynamic Interface with Primary and Secondary DHCP Server. For testing purposes,we simulate that the primary DHCP is dead. Does anyone know what is defined as "Dead Criteria" for the primary DHCP? When will the WLC start to use the Secondary DHCP? BR, Michael

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weterry Thu, 04/15/2010 - 05:37
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I actually think the WLC will proxy the DHCP requests to both DHCP servers... If there is no response from the Primary then it just accepts from the secondary. I don't believe it works like primary/secondary radius servers

But I could be wrong.

Do a client debug (debug client ) and see what happens when your first dhcp server is uneachable.

MICHAEL SCHROEDER Thu, 04/15/2010 - 06:36
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If DHCP Proxy is enabled, the WLC will only relay to the Primary Controller, thats what i see in the Network Trace. I still await a Client Debug from the Customer, maybe we will be clear then. BR, Michael


I have a customer wth a WLC which has DHCP Proxy disabled and Primary & Secondary DHCP servers configured (external to the WLC).

The problem I've just started looking at is...if the Primary has run out of leasable IP addresses, the WLC doesn't appear to request one from the Secondary server.

It looks like (without any real investigation) the "I've run out of addresses" response from the Primary server is sufficient for the WLC to believe that the Primary is still on the network and it doesn't need to go to the Secondary.

I'll add more as and when I do more testing.


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