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Cisco Bug: CSCtb44674 - High CPU due to SA-MISS event caused by own mac address packets received

Last Modified

Aug 12, 2017

Products (3)

  • Cisco IOS
  • Cisco Catalyst 4500 Supervisor Engine 6-E
  • Cisco Catalyst 4900M Switch

Known Affected Releases


Description (partial)

On a router interface, packets received with the same mac address as that of the router can cause high CPU
The error is seen when using an SVI interface on the router. Packets that have the same mac address as that of router cause an SA-MISS event and are sent to the CPU as the router attempts to learn the mac address of the incoming packet. With a large enough rate, these packets can overwhelm the CPU.
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