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Cisco Bug: CSCuo86478 - WLC Set Wrong DHCP Relay Agent for Layer-2 Roaming

Last Modified

Nov 19, 2018

Products (1)

  • Cisco 5500 Series Wireless Controllers

Known Affected Releases

7.6(110.0) 8.0(72.183)

Description (partial)

During client Layer 2 roaming, the new WLC uses the old WLC's dynamic interface IP as relay agent IP address, not its own local dynamic interface IP address. That cause DHCP offer/ACK messages come back to the old WLC and the new WLC did not get any. 
The new WLC will only use its local dynamic interface IP correctly until the DHCP retry counts exceeds and it resets the DHCP server. DHCP works successfully later but there is 18 to 28 second gap. The client may or may not lose connectivity during that gap period, depending on client behavior.


Related Community Discussions

7.6MR3 Beta Availability
7.6.122.x Available - 7.6MR3 Beta       Aug  26h 7.6MR3 ( is now posted in CCO.  Beta for this release is over, thanks!   Support For any new issue during this test, please write to, pre-existing problems would be directed through normal TAC support channels, the image is TAC supported until CCO release of final code   Image types AS_5500* can be used for Wism2/2500/5500 controller types AS_7500* can be used for 7500/8500 AS_CTVM can be used for vWLC   Issues ...
Latest activity: Aug 25, 2014
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