Unable to Add VLAN Tag to Layer-3 Interface

Unable to Add VLAN Tag to Layer-3 Interface

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Created On 09/25/18 20:34 PM - Last Modified 06/07/23 20:43 PM


Resolution


Issue

Unable to add a VLAN tag to a physical layer-3 interface.

 

Resolution

When a physical interface needs to be configured to handle VLANs, sub-interfaces need to be created (one per VLAN).  The sub-interfaces are configured with the tag, and show as "tagged" when looking at the list of interfaces (see example), as opposed to the physical interface itself.

9-19-2012 9-49-56 AM.png

The example shows that ethernet1/4 remains untagged while its sub-interface (ethernet1/4.10) shows the VLAN tag ID.

Not being able to apply a VLAN ID on the physical interface is normal, expected behavior.

 

owner: ukhapre
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