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Cisco Bug: CSCvt36854 - VLAN create fails if VLAN name already exists - CLI hangs and MTS is stuck

Last Modified

Oct 06, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

7.0(3)I7(6)

Description (partial)

Symptom:
Creating a VLAN for which a VLAN NAME already exists will fail and cause CLI to hang.  We also see that VLAN_MGR messages may be stuck in MTS.  Example below:

The following configuration already exists in the running-config.  VLAN 345 with name VLAN0045:
vlan 345
  name VLAN0045

Running the following command will cause failure:
# conf t
# vlan 45
<CLI hang> 

# show system internal mts buffers  summary 
node    sapno   recv_q  pers_q  npers_q log_q
sup     167     0       0       0       1      <<<<<<< 167 may become stuck

# show system internal mts sup sap 167 description 
Vlan_mgr SAP

Conditions:
Issue is seen on Nexus 3000 and 9000 switch series.
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