Why must id VLAN unique for each external network?

Sometimes we have several public networks with the same VLAN, but in this case, we could not add them as external network to vCloud Director, he complains that the VLAN ID has been used, then assign a VLAN ID for each public network. Could someone explain to me why a unique id of VLAN is needed here?

Thank you!

If they are the same vLAN on the same Switch, they are actually exactly the same from the point of view of the vCloud Director.

The alternative is to see if the superposition of external networks allows it works (Admin > General).

Tags: VMware

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