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Cisco Bug: CSCsy76265 - Sup6E: ARP snoop with AutoQOS causes EAPOL time outs

Last Modified

Mar 06, 2018

Products (1)

  • Cisco Catalyst 4000 Series Switches

Known Affected Releases


Description (partial)


At low authentication rates the ARP Snoop process hogs the CPU, and significantly impacts the performance of the switch. CPU jumps to 100% and remains there until all ports participating in Dot1x authentications are shut down. Console and vty access are severly impacted, and are very slow.

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