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Cisco Bug: CSCvs19550 - N9K: high CPU on ipfib and system lockup after frequent IPv6 update/flap/removal

Last Modified

May 06, 2020

Products (59)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 3636C-R Switch
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 92348GC-X Switch
  • Cisco Nexus 92304QC Switch
  • Cisco Nexus 3064 Switch
  • Cisco Nexus 92160YC-X Switch
  • Cisco Nexus 31108TC-V Switch
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Known Affected Releases


Description (partial)

High number of add/delete events of a large number of IPv6 routes might cause high CPU due to an IPFIB process, inband instability (BFD flap, OSPF flap), MGMT instability (SSH, TACACS, slow responses to CLI and in some instances a crash of the IPFIB process.

Issue occurs if there is large number of IPv6 routes flapping in the network.
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