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Cisco Bug: CSCur39582 - vlan_mgr unresponsive on creating or deleting VLAN

Last Modified

Jan 14, 2020

Products (13)

  • Cisco Nexus 5000 Series Switches
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 6004 Switch
  • Cisco Nexus 5624Q Switch
  • Cisco Nexus 5672UP Switch
  • Cisco Nexus 6001 Switch
  • Cisco Nexus 5020 Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 56128P Switch
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Known Affected Releases

5.2(1)N1(7) 5.2(1)N1(8a) 6.0(2)N2(5) 7.0(5)N1(1) 7.0(5)N1(1a) 7.1(0)N1(0.432) 7.1(0)N1(1)

Description (partial)

Please check also bug CSCut16773, with similar symptoms.
On a N5k or N6k, creating or deleting a vlan may result in unexpected behavior.
The following errors may be observed when trying to create a vlan:
Switch(config)# vlan 2000
Service not responding
Switch(config)# vlan 2000

Additionally, the device may also reload when trying to create such a vlan.
Reset reason is seen as 'vlan_mgr hap reset'

----- reset reason for Supervisor-module 1 (from Supervisor in slot 1) ---
1) ...
    Reason: Reset triggered due to HA policy of Reset
    Service: vlan_mgr hap reset
    Version: ...

VLAN is being added or deleted when all ports (this includes CE, FP, physical and Port channels) on the chassis are in a layer2 configuration.
The issue has been observed in NX-OS releases 5.2N and 6.0N.
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