Guest

Preview Tool

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

12.2(25)EWA13

Description (partial)

Symptom:

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

Conditions:

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.
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.