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Cisco Bug: CSCuj07290 - 2.5 minutes L2 traffic flooding after BD flush (MAC learned on 100G i/f)

Last Modified

Oct 24, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

4.2.1.BASE 5.1.1.BASE

Description (partial)

Symptom:
After MAC flush due to spanning tree topology change or LDP MAC withdraw,  L2 bridge traffic destined to AC on 100G interface line card (Juggernaut) may be flooded for half MAC age. By default, half MAC age is 2.5 minutes. This may happen when the destination MAC address is learned on the 100G AC after MAC flush.

Conditions:
L2 traffic flooding is triggered by MAC flush due to spanning tree topology change or LDP MAC withdraw.
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