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Cisco Bug: CSCus09312 - PVLAN:VPC PO member (M1 LC) flaps.

Last Modified

Feb 11, 2018

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

6.2(10)S102 6.2(12)FT(0.7)

Description (partial)

Port-channels which have 
1) PVLAN trunk secondary config
2)LACP or other control protocols running, 
could flap continuously, due to BPDU's not flowing. They don't flow because the native vlan is in CBL disabled state, instead of being in CBL Blocking state.

The issue is specific to M1 module since the programming model is different on F2/F3 LC's.
There is no issue on F2 and F3 modules.

Even if the customer uses M1 module there is NO issue, if customer is allowing native VLAN on VPC Leg.

Below are the 3 conditions that need to be satisfied to hit this bug:
1) PVLAN port mode should be TRUNK Secondary
2) Native VLAN is NOT allowed on VPC Leg
3) LC Module should be M1 module
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