Troubleshooting Vlan Issues; You Cannot Create A Vlan; You Cannot Create A Pvlan; The Vlan Interface Is Down - Cisco Nexus 9000 Series Troubleshooting Manual

Troubleshooting VLANs
Checklist
Verify the physical connectivity for any problem ports or VLANs.
Verify that you have both end devices in the same VLAN.
The following CLI commands are used to display VLAN information:
• show vlan vlan-id
• show vlan all-ports
• show tech-support vlan
• show vlan private-vlan [type]
• show interface vlan vlan-id private-vlan mapping

Troubleshooting VLAN Issues

You Cannot Create a VLAN

You may have a problem when creating a VLAN.
Symptom
You cannot create a
VLAN

You Cannot Create a PVLAN

You may experience issues when creating a private VLAN (PVLAN).
Symptom
You cannot create a
PVLAN.

The VLAN Interface is Down

You might have a problem when configuring VLAN interfaces.
Possible Cause
You are using a reserved VLAN ID.
Possible Cause
The PVLAN feature is not enabled.
Cisco Nexus 9000 Series NX-OS Troubleshooting Guide, Release 7.x
Troubleshooting VLAN Issues
Solution
VLANs 3968 to 4047 and 4094 are reserved for
internal use; you cannot change or use these
reserved VLANs.
Solution
Use the feature private-vlan command to
enable the PVLAN feature.
Done
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