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Cisco Bug: CSCvv36477 - MAC flapping between physical interface and nve1(127.0.0.1)

Last Modified

Sep 30, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

7.0(3)I7(7) 9.3(4)

Description (partial)

Symptom:
Constant MAC flapping between physical interface and nve1(127.0.0.1) that causes packet loss. also NVE peer 127.0.0.1 is seen in nve peer table:
# sh nve peers 
Interface Peer-IP                                 State LearnType Uptime   Router-Mac       
--------- --------------------------------------  ----- --------- -------- -----------------
nve1      127.0.0.1                               Up    DP        00:01:40 n/a

Conditions:
Issue happen only in Flood and LEarn in VXLAN environment  where ISIS packet re received from downstream switches
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