Calculate VLAN trunk bandwidth efficiency with 802.1Q tagging overhead. 802.1Q adds a 4-byte tag to each frame; efficiency = payload / (payload + all_headers + tag).
Enter the values for the scenario you are assessing. Calculate VLAN trunk bandwidth efficiency with 802.1Q tagging overhead. 802.1Q adds a 4-byte tag to each frame; efficiency = payload / (payload + all_headers + tag). Use the vlan trunk efficiency result to inform your calculation.