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Cisco Bug: CSCtb42624 - WLC docs to understand GARP behavior

Last Modified

Feb 22, 2014

Products (1)

  • Cisco 5500 Series Wireless Controllers

Known Affected Releases


Description (partial)

 The documentation for the WLCs--particularly the Release Notes and 
Configuration Guides needs to be updated on the behavior of WLC when WLC 
receives GARP response from the gateway ip of dynamic interface first in case 
of a fail over scenario 
 The dynamic interfaces as well as the ap-manager/management interface 
gateways of the WLC is on the same switch. When this switch is rebooted, the 
backup switch takes over and sends out GARP for all the interfaces. 
 The Dynamic Interface gateway fails first and WLC receives the GARP for the 
dynamic interface first from the switch and sends it out accordingly to the 
client. After the WLC has sent out this GARP the gateway for the ap-manager 
fails and this packet is dropped.  WLC gets the updated GARP for the ap-
manager only after this. Clients do not receive this GARP and lose connection 
for a while until they redo ARP.
 Any controller in fail over scenario which will receive GARP reply first on 
the dynamic interface
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