This issue occurs when the untagged VLAN ID does not match between switches. The switch can still communicate even though the VLAN ID doesn’t match because it is untagged, it just generates an informational message to let you know they don’t match.
The event log message may look similar to the following:
I 08/17/18 03:15:15 00828 lldp: PVID mismatch on port 24(VID 0)with peer device
port 48(VID 1)(37508)
There are two ways to resolve this:
- Configure both switches so the untagged VLAN ID matches on both devices (similar to how you configure tagged ports).
- Enable the “no lldp config <ports> dot1TlvEnable port-vlan-id” command on the uplink port between the switches. This stops the switch from sending its untagged VLAN membership ID to the neighboring switch.
For example, if Switch 1, port 24 connects to Switch 2, port 48, you could configure the following:
no lldp config 24 dot1TlvEnable port-vlan-id
no lldp config 48 dot1TlvEnable port-vlan-id
no lldp config <ports> dot1TlvEnable port-vlan-id
Verify event logs no longer report PVID Mismatch errors on that uplink port.