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Cisco Bug: CSCte43607 - MAC address flooding after vPC shutdown

Last Modified

Feb 07, 2017

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases


Description (partial)

When the vPC Peer link between two N7K is broken, traffic flooding is seen throughout the test network. 

vPC Peer Link is broken at aggregation layer between 2 N7Ks. An ungraceful_shut on the member ports of the vPC on the N7k is observed. On the N5k, an Out_of_Sync_PDU is received. The N5k then tries to flap the port and then sends out a TCN to the N7k.
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