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Cisco Bug: CSCur50305 - vtp doesn't remove vlans (1002-1005) after switching to transparent

Last Modified

Sep 11, 2019

Products (8)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases

6.2(10) 6.2(2) 6.2(2a) 6.2(6) 6.2(6b) 6.2(8) 6.2(8a) 6.2(8b)

Description (partial)

Vtp dropped into transparent mode due to some unexpected error condition during vlan creation/modification,
but the reserved vlan 1002-1005 were not removed. 
This is preventing vtp mode changes till the reserved vlans are removed. In vtp transparent mode is possible to remove these vlans but a second symptom is observed. Vlan manager is logging that vtp is client/server mode so the changes can not be done. 
As a summary there are two symptoms due to failing to create/update vlan :
1) Reserved vlan 1002-1005 are not removed. Show vlan will still displaying them.
2) When vtp drops into transparent mode, vlan mgr is not able to update vlan. 
swith(config)# no vlan 20-41
ERROR: VTP VLAN configuration not allowed when device is in CLIENT mode

Feature vtp has to be enabled and an error condition has to happen during vlan creation/modification.
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