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Cisco Bug: CSCul87497 - Control packet drops seen when SP-0 buffers are 100% utilized

Last Modified

Feb 02, 2017

Products (7)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3064 Switch
  • Cisco Nexus 3016 Switch
  • Cisco Nexus 3064-T Switch
  • Cisco Nexus 3048 Switch
  • Cisco Nexus 3132Q Switch
  • Cisco Nexus 3172 Switch

Known Affected Releases

6.0(2)U2(1) 6.0(2)U3(1)

Description (partial)

When PFC packet buffer reservation via 'hardware profile pfc mmu reservation' command is high, e.g., 90%, control packets in no-drop classes, ingressing network ports and going to CPU,may get dropped due to lack of buffer memory.Symptom:LACP, UDLD, BFD, UDP, STP packets are dropped and protocols may flap.
Conditions:High buffer reservation for PFC, in 'hardware profile pfc mmu reservation'  command, e.g., 90%
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