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Cisco Bug: CSCvs07988 - Nexus crashes just after configuring FEX ports as L2 trunk

Last Modified

Mar 05, 2020

Products (12)

  • Cisco Nexus 5000 Series Switches
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 6004 Switch
  • Cisco Nexus 5624Q Switch
  • Cisco Nexus 5672UP Switch
  • Cisco Nexus 6001 Switch
  • Cisco Nexus 5696Q Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 56128P Switch
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Known Affected Releases


Description (partial)

N5k crashes just after a  FEX port is configured as an L2 trunk.

This error occurred:

%STP-2-VLAN_PORT_LIMIT_EXCEEDED: The number of vlan-port instances (209800) exceeded [Rapid-PVST mode] recommended limit of 48000
`show install all status`

Reason: Reset triggered due to HA policy of Reset
    Service: stp hap reset

after configuring FEX ports as L2 trunk.

From data provided I can see:
`show system reset-reason`
----- reset reason for Supervisor-module 1 (from Supervisor in slot 1) ---
1) At 709980 usecs after Fri Sep 27 08:40:32 2019
    Reason: Reset triggered due to HA policy of Reset
    Service: stp hap reset
    Version: 7.2(1)N1(1)

`show cores`
VDC  Module  Instance  Process-name     PID       Date(Year-Month-Day Time)
---  ------  --------  ---------------  --------  -------------------------
1    18      1         stp              4216      2019-09-27 08:45:57
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