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Cisco Bug: CSCup11294 - F340: vpls_fwd: unknown unicast packets duplicated on BD 200 & 400

Last Modified

Mar 27, 2020

Products (8)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases

6.2(14) 7.1(0)MPL(0.28)

Description (partial)

Symptom:
Upon seeing a specific interrupt :-

FLN_QUE_INTR_VQ_REPL_CNT_OVR_FLW or 
FLN_QUE_INTR_VQ_REPL_CNT0_REPL_DRP or 
FLN_QUE_INTR_VQ_REPL_CNT0_PKT_SENT 

either line card will go down or port-group will go down depending on which port-group saw the problem. If issue is seen on first port-group, then entire line card will go down. But if issue is seen on any other port-group, then that port-group will go down.

Conditions:
Prerequisites to see this issue :-
Having a N7k or N77k F3 line card in OTV vdc on 6.2(x) code
Having four or more OTV sites using unicast core

Asymmetric extension of OTV VLANs across the sites increases the chances of seeing this problem.


Trigger:-
Shutdown join interface on one of the site or
clear OTV isis adjacency * or
Shutdown Overlay interface on one of the site
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