Mac Address Learning - Buffalo BS-XP20 Series User Manual

MAC Address Learning

This switch uses SVL (Shared VLAN Learning) to learn MAC addresses. SVL is a method that retains a shared MAC
address table for the entire switch. It differs from IVL, which retains a MAC address table for each VLAN. Be sure you
understand how SVL works before you create a VLAN with the switch.
Differences between Operation of SVL and IVL
Switch 1
Switch 2
PC 1
(VLAN 1, PVID 1)
SVL
When PC 1 and PC 3 communicate, PC 3 is learned by port 1 on switch 2 so PC 2 and PC 3 cannot communicate.
IVL
When PC 1 and PC 3 communicate, PC 3 is learned by both VLAN 1 and VLAN 2 so PC 2 and PC 3 can communicate.
However, frames sent from PC 3 to PC 1 are also delivered to PC 2.
VLAN 1 VLAN 2
VLAN 1 VLAN 2
PC 3
(VLAN 1, 2, 3 PVID 3)
VLAN 3
PC 2
(VLAN 2, PVID 2)
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