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Cisco Bug: CSCtd52715 - Multiple entries for the same mac-add in DHCP snooping binding table

Last Modified

Jan 30, 2017

Products (1)

  • Cisco Catalyst 4000 Series Switches

Known Affected Releases


Description (partial)


DHCP snooping binding table could maintain two different ip address for the same Mac address in different vlan.


DHCP snooping is deployed with dot1x authentication, snooping enabled on both guest vlan as well as authenticated vlan.  Before the host authentication is completed, host may get a ip address from guest vlan, therefore creating first dhcp snooping binding for the host.  After host authentication is completed, host will get a new ip address from authenticated vlan, which may resulting 2nd dhcp snooping binding created for the same host.
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