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Cisco Bug: CSCuq93118 - L2 flood, due to egress block mask missing for VPC po.

Last Modified

Mar 17, 2016

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

6.1(2)I3(0.208) 7.0(3)I1(0.81)

Description (partial)

vPC switch which has "secondary" role and receiving L2  packets coming over MCT will flood back to other vPC on same switch.

Symptom:
Mac address flap . L2 flooding of packet to same switch which originated the packets.

Conditions:
Switch configured for vPC and traffic crossing MCT link.
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