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Cisco Bug: CSCvt77249 - fc4-types:fc4_features missing from fcns database and fcoe traffic interrupted

Last Modified

Oct 16, 2020

Products (2)

  • CiscoPro Workgroup EtherSwitch Software
  • Cisco Nexus 7000 Series Switches

Known Affected Releases


Description (partial)

On Nexus 7000 or 7700 switch with a storage vdc, it is possible in rare circumstances to experience various symptoms including traffic disruption. Device affected by this bug will have fc4 type field empty in the output of show fcns database.

This can happen only on systems with fex modules attached, and a necessary condition is that port-channels connecting the fex modules to the switch are connected to more than one linecard. If one of these linecards is then reloaded, this issue may be experienced.

If each fex module is connected to only one linecard, you cannot be affected by this issue.
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