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

Last Modified

Jun 05, 2018

Products (3)

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

Known Affected Releases

12.2(52)SG

Description (partial)

Symptom:
On a router interface, packets received with the same mac address as that of the router can cause high CPU
Conditions:
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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