Why is the throughput performance of LAN to LAN is better than VLAN to LAN?

Zyxel_Jeff
Zyxel_Jeff Posts: 1,059  Zyxel Employee
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Scenario :

The user may find that the lan1 and vlan interfaces belong to the same LAN group; however, the throughput performance from LAN to LAN is better than from VLAN to LAN, as exemplified in the following examples: lan1 to lan1 and vlan100 to lan1.

lan1

VLAN100

Answer :

The traffic from LAN to LAN will be directly handled by the firewall's switch PHY chipset, while the traffic from VLAN to LAN will be processed by the firewall's CPU. Therefore, the throughput performance of LAN to LAN is better than that of VLAN to LAN.