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[WLA/WLC] The WLA device will not boot when two entries are present in the DNS record that resolves the domain name of the WLC device

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Article ID: KB25572 KB Last Updated: 14 Aug 2012Version: 1.0
Summary:
This article describes the issue of WLA devices not booting, when two entries are used in the DNS record, which resolves the domain name of the WLC device.
Symptoms:
  • For redundancy purposes, in the absence of the cluster feature, you might have two IP addresses in the DNS record, which point to two different WLC devices.

  • When the WLA device tries to boot by using the parameters in the static boot configuration, it will receive a DNS reply, which contains both IP addresses in a given order (for example, the order is (x,y) and address x is unreachable; whereas y is reachable).

  • The WLA will try to contact only address x and as that address is not reachable, the WLA might get stuck in a loop; without the ability to boot up correctly.
Cause:

Solution:
  • Ensure that DNS uses the IP addresses in a round-robin manner. When the WLA device issues another DNS query, it will receive the addresses in a different order (y,x); as y is reachable, the WLA device will boot correctly.

  • Alternatively, you can use the DHCP option 43 feature. When using this feature, the WLA will contact all the addresses it receives; until it manages to boot.
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