Mac Address Learning - Buffalo BSL-PS-G2108M User Manual

Chapter 1 Product Overview
Cooling Fan
A fan for cooling the power supply is installed in the rear panel of the switch. If the fan stops, a
buzzer sounds and PoE functionality is disabled. Although switching still functions, turn off the unit
and disconnect power until the fan is fixed. Prolonged usage in this state can result in a fire due to
overheating.

MAC Address Learning

The switch uses IVL to learn MAC addresses.
IVL is a method that retains a MAC address table for each VLAN. It differs from SVL, which retains a
shared MAC address table for the entire device.
Be sure you understand how IVL works before you create a VLAN with the switch.
Differences between Operation of IVL and SVL
Port 1
VLAN 1,3
Switch 1
Switch 2
VLAN 1
Port 1
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.
PC3
Port 2 Port 3
VLAN 2,3 VLAN 1,2,3
VLAN 2 VLAN 1
Port 2 Port 3
PC 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.
Port 4
VLAN 3
VLAN 2
Port 4
PC 2
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